National Weather Service United States Department of Commerce
 
 
 September 25, 2018 Flash Flooding
 
 
 Synopsis
  • A couple of weak shortwaves moving through a diffluent upper flow, and an eastward moving low level jet aided in overrunning of a tropical and marginally unstable airmass over a stationary warm front draped across the region. This set-up resulted in a widespread area of moderate rain over the entire region, with a narrow and slow moving band of torrential rainfall from training showers and thunderstorms, oriented along a SW to NE convergence zone. This convergence band developed over Northeastern New Jersey late Tuesday morning, and then slowly slid east across northern portions of the NYC metro, Westchester County and into Southwestern Connecticut through afternoon. Rainfall rates of 2 to 3 inches/hr were observed and radar detected; with rainfall total of up to 4 to 7 inches. This convergence band continued to move eastward across Central Long Island and Central and Eastern Connecticut Tuesday evening, while being invigorated by additional shower and thunderstorm cells advecting north from off the ocean. Rainfall totals of 4 to 8 inches were observed and radar indicated across this area. Much of this rainfall fell in 3 to 4 hours.
 
 Impacts
  • Connecticut: Widespread reports of flash flooding across all counties in Southern CT with as much as 5 to 9 inches of rainfall was measured and/or radar estimated, falling during a 3-4 hr period Tuesday afternoon into Evening. Numerous roadways were flooded in Fairfield, New Haven, Middlesex, and New London counties with water reported up to rooftops in spots; including portions of major roadways such as I95 in East Norwalk, Route 207 in Lebanon, Routes 55 and 9 in Middletown, and Route 16 in Colchester. Numerous water rescues were conducted for people stuck in cars on flooded roadways, including at least 15 rescues in Bridgeport alone by local Fire Department. The heavy rainfall across the Yantic River basin, caused a rare flashy response in the river, cresting at major flood stage of around 12.53 feet at 2:47 am on 9/26. This level is considered major flooding and has not been seen on the river since March 30, 2010 when the river crested at 13.23 feet.
  • New Jersey: Widespread reports of flash flooding across Northeastern New Jersey between 1142 am and 615 pm, with Essex, Hudson and Bergen Counties being the most heavily impacted. As much as 4 to 6 inches of rainfall were measured and/or radar estimated, with much of it falling during a 3-4 hour period between Tuesday afternoon. The flooding closed numerous roadways with waters as deep as 3 to 4 feet in spots; including portions of major roadways, such as US 1 and US 9 and the NJ Turnpike. Numerous cars were stuck in flood waters with rescues having to be performed, including Hackensack Fire Dept. rescuing at least 18 people from flood waters in Hackensack alone.
  • New York: Several reports of flash flooding, as the heaviest swaths of rain with as much as 3 to 5 inches of rain falling in 2 to 3 hours, occurring across Southern Westchester, Bronx, Northern Queens, and Northwest Suffolk Counties. Several road closures were reported in these areas with waters as deep as 3 to 4 feet in spots; including Mosholu Parkway in the Bronx County, the Bronx River Parkway in Westchester County, and portions of Route 25A and 112 in Suffolk County. Significant flash flooding also occurring in Port Jefferson Village where evacuations took place from the Old Field Restuarant and Theatre 3.


 

 
Rainfall Accumulation

 

Observed Rainfall

 

locsnow

 

 

Rainfall Reports Listing
Connecticut

LOCATION          STORM TOTAL     TIME/DATE   COMMENTS
                     RAINFALL           OF
                     /INCHES/   MEASUREMENT
...Fairfield County...
   Trumbull              7.32   942 PM  9/25  Trained Spotter
   3 SSW Shelton         6.60   800 AM  9/26  CoCoRaHS
   3 WSW Shelton         6.46   700 AM  9/26  CoCoRaHS
   2 NE Fairfield        5.61  1130 PM  9/25  Trained Spotter
   Trumbull              5.40   700 AM  9/26  CoCoRaHS
   2 WSW Shelton         5.29   823 AM  9/26  CWOP
   Wilton                5.25   630 PM  9/25  Public
   Norwalk               4.92   659 AM  9/26  Social Media
   3 NNW Norwalk         4.79   700 AM  9/26  CoCoRaHS
   1 ENE Darien          4.77   745 AM  9/26  CoCoRaHS
   Darien                4.42   654 AM  9/26  Social Media
   2 NW Darien           4.34   700 AM  9/26  CoCoRaHS
   2 S New Canaan        4.30   500 AM  9/26  CoCoRaHS
   1 S Monroe            4.19   820 AM  9/26  CoCoRaHS
   1 WNW Westport        4.11   813 AM  9/26  CWOP
   Stratford             4.08   800 AM  9/26  CoCoRaHS
   4 NNW New Canaan      4.05   600 AM  9/26  CoCoRaHS
   Stamford              3.80   937 PM  9/25  Social Media
   1 SSE Ridgefield      3.67   800 AM  9/26  CoCoRaHS
   1 SSW Georgetown      3.66   802 PM  9/25  CWOP
   1 NNW Stamford        3.60   800 AM  9/26  CoCoRaHS
   1 ENE Norwalk         3.60   801 AM  9/26  CWOP
   New Canaan            3.49   500 PM  9/25  CoCoRaHS
   Stratford             3.18   700 AM  9/26  CoCoRaHS
   3 ESE Bethel          3.10   700 AM  9/26  CoCoRaHS
   4 E Newtown           2.89   800 AM  9/26  CoCoRaHS
   3 NW Monroe           2.89   800 AM  9/26  CoCoRaHS
   Bethel                2.80   700 AM  9/26  CoCoRaHS
   3 N Ridgefield        2.78   700 AM  9/26  CoCoRaHS
   2 ENE Fairfield       2.72   810 AM  9/26  CWOP
   Danbury Airport       2.71   800 PM  9/25  ASOS
   Stratford             2.60   825 AM  9/26  CWOP
   Brookfield            2.37  1000 PM  9/25  CoCoRaHS
   New Fairfield         2.27   715 PM  9/25  Trained Spotter
   4 WNW Newtown         2.24   700 AM  9/26  CoCoRaHS
   3 NNE Bethel          2.17   653 AM  9/26  CoCoRaHS
   Bethel                2.00   300 PM  9/25  CoCoRaHS
   Bridgeport Airport    1.98   800 AM  9/26  ASOS
   1 ENE Stamford        1.38   815 AM  9/26  CWOP

...Middlesex County...
   1 N Durham            7.24   802 AM  9/26  AWS
   2 E Killingworth      6.67   700 AM  9/26  CoCoRaHS
   Killingworth          6.10   930 PM  9/25  CoCoRaHS
   2 SW Middletown       5.96   802 AM  9/26  AWS
   Higganum              5.90   800 AM  9/26  CoCoRaHS
   Clinton               5.28   845 PM  9/25  Broadcast Media
   1 W Durham            4.85   700 AM  9/26  CoCoRaHS
   3 WSW Essex           4.50   800 AM  9/26  CoCoRaHS
   2 NNW Durham          4.45   628 AM  9/26  CoCoRaHS
   Fenwick               3.93   745 AM  9/26  HADS
   Portland              3.90   800 AM  9/26  CoCoRaHS
   1 ENE Westbrook       3.54   700 AM  9/26  CoCoRaHS
   1 NNE Westbrook       3.53   815 AM  9/26  CWOP
   2 N East Hampton      3.51   500 AM  9/26  CoCoRaHS
   Essex                 3.25   730 AM  9/26  CoCoRaHS

...New Haven County...
   2 W Hamden            8.59   746 AM  9/26  MESOWEST
   2 SW Hamden           6.79  1150 PM  9/25  Trained Spotter
   1 SE North Madison    6.70   700 AM  9/26  CoCoRaHS
   East Wallingford      6.42  1150 PM  9/25  Trained Spotter
   3 NNE North Haven     6.33  1150 PM  9/25  Trained Spotter
   Woodbridge            6.05   808 PM  9/25  Public
   1 W Madison           5.93   700 AM  9/26  CoCoRaHS
   1 NW Shelton          5.80   930 AM  9/26  CoCoRaHS
   1 E Branford          5.60   802 AM  9/26  AWS
   1 WNW Wallingford     4.97   700 AM  9/26  CoCoRaHS
   Stony Creek           4.87   910 PM  9/25  Trained Spotter
   2 ESE Cheshire        4.83   700 AM  9/26  CoCoRaHS
   1 N Wallingford       4.75   700 AM  9/26  CoCoRaHS
   Madison               4.48   815 PM  9/25  CoCoRaHS
   Meriden Airport       4.40   753 AM  9/26  ASOS
   2 ENE Prospect        4.20   600 AM  9/26  CoCoRaHS
   1 SSE Oakville        4.20   818 AM  9/26  CWOP
   3 E Monroe            4.15   804 PM  9/25  CWOP
   1 NNE Ansonia         4.14   414 AM  9/26  MESOWEST
   West Haven            4.00   700 AM  9/26  CoCoRaHS
   Seymour               3.89   700 AM  9/26  CoCoRaHS
   3 E Naugatuck         2.52   755 AM  9/26  CoCoRaHS
   New Haven             2.50   645 PM  9/25  CoCoRaHS
   Waterbury Airport     2.46   751 AM  9/26  AWOS
   1 W Woodmont          2.39   552 AM  9/26  CoCoRaHS
   New Haven Airport     2.33   800 AM  9/26  ASOS
   1 NE Naugatuck        2.28   630 AM  9/26  CoCoRaHS
   3 SSW East Haven      2.27   600 AM  9/26  CoCoRaHS
   2 WNW Naugatuck       1.57   812 AM  9/26  CWOP

...New London County...
   Lebanon               6.79   920 PM  9/25  HAM radio
   Colchester            6.09   945 PM  9/25  Trained Spotter
   Gilman                6.04   434 AM  9/26  Social Media
   2 NNE Norwich         4.85   530 AM  9/26  CoCoRaHS
   3 E Salem             4.68   700 AM  9/26  CoCoRaHS
   3 E Old Lyme          4.53   700 AM  9/26  CoCoRaHS
   2 WNW Niantic         4.21   600 AM  9/26  CoCoRaHS
   Norwich               4.07   700 AM  9/26  Co-Op Observer
   1 SW Niantic          3.92   700 AM  9/26  CoCoRaHS
   Gales Ferry           3.71   700 AM  9/26  CoCoRaHS
   2 WNW Preston         3.69   700 AM  9/26  CoCoRaHS
   2 NW Preston          2.74   801 AM  9/26  CWOP
   2 E Jewett City       2.71   430 AM  9/26  CoCoRaHS
   New London            2.54   630 AM  9/26  CoCoRaHS
   2 S Waterford         2.29   700 AM  9/26  CoCoRaHS
   New London            2.25   523 AM  9/26  CoCoRaHS
   New London            2.23  1100 PM  9/25  Trained Spotter
   Mystic                2.10   715 AM  9/26  Public
   Mystic                2.02   700 AM  9/26  CoCoRaHS
   Groton Airport        1.99   800 AM  9/26  ASOS
   3 E Mystic            1.84   700 AM  9/26  CoCoRaHS
   Mystic                1.73   700 AM  9/26  CoCoRaHS
   1 SSE Pawcatuck       1.62   600 AM  9/26  CoCoRaHS
   3 SW Pawcatuck        1.60   700 AM  9/26  CoCoRaHS   
   
New Jersey

LOCATION          STORM TOTAL     TIME/DATE   COMMENTS
                     RAINFALL           OF
                     /INCHES/   MEASUREMENT
...Bergen County...
   WNW Palisades Park    5.56   900 AM  9/26  CoCoRaHS
   Lyndhurst             5.16   803 AM  9/26  AWS
   Maywood               4.86   700 PM  9/25  Social Media
   1 W Tenafly           4.41   730 AM  9/26  CoCoRaHS
   Teterboro Airport     3.86   800 AM  9/26  ASOS
   River Edge            3.80   700 AM  9/26  CoCoRaHS
   Haworth               3.66   800 AM  9/26  NJWXNET
   Tenafly               3.56   230 PM  9/25  CoCoRaHS
   Wood-ridge            3.34   823 AM  9/26  CWOP
   1 E Westwood          3.34   800 AM  9/26  CoCoRaHS
   East Rutherford       3.30   810 PM  9/25  Trained Spotter
   1 SE Fair Lawn        2.91   800 PM  9/25  CWOP
   North Arlington       2.78   820 AM  9/26  CoCoRaHS
   Westwood              2.76   806 AM  9/26  CWOP
   Oakland               2.40   700 AM  9/26  CoCoRaHS
   Oakland               2.29   730 AM  9/26  CoCoRaHS
   Midland Park          2.20   745 AM  9/26  IFLOWS

...Essex County...
   2 SE Harrison         3.58   754 AM  9/26  GOES
   North Caldwell        3.14   900 AM  9/26  CoCoRaHS
   Cedar Grove           3.10   945 PM  9/25  Trained Spotter
   1 NW Nutley           2.54   821 AM  9/26  CWOP
   North Caldwell        2.50   820 AM  9/26  CWOP
   Montclair             2.43   700 AM  9/26  CoCoRaHS
   Caldwell Airport      2.33   800 PM  9/25  ASOS
   Millburn              2.30   825 AM  9/26  CWOP
   1 SE Cedar Grove      2.19   730 AM  9/26  CWOP
   Caldwell              2.11   753 AM  9/26  ASOS
   Maplewood             2.03   700 AM  9/26  CoCoRaHS

...Hudson County...
   Bayonne               4.77   500 PM  9/25  Mesonet
   North Bergen          4.07   115 PM  9/25  Mesonet
   Secaucus              4.04   115 PM  9/25  Mesonet
   Harrison              3.14   800 AM  9/26  Co-Op Observer
   Kearny                2.98   836 PM  9/25  Public
   1 WSW North Arlingto  1.83   824 AM  9/26  CWOP
   1 SW North Arlington  1.53   825 AM  9/26  CWOP
   Hoboken               1.35   822 AM  9/26  CWOP
   Jersey City           1.01   800 AM  9/26  NJWXNET

...Passaic County...
   Little Falls          3.14   700 AM  9/26  CoCoRaHS
   Little Falls          3.00   750 AM  9/26  CoCoRaHS
   West Paterson         2.83   803 AM  9/26  CWOP
   Hawthorne             2.73   800 AM  9/26  NJWXNET
   1 SSE Hawthorne       2.57   700 AM  9/26  CoCoRaHS
   2 NE Wanaque          2.32   720 AM  9/26  CoCoRaHS
   1 SSW Wayne Twp       2.17   700 AM  9/26  CoCoRaHS
   1 SSW Wayne           2.12   800 AM  9/26  NJWXNET
   1 E Ringwood          2.10   810 AM  9/26  RAWS
   1 E Pompton Lakes     1.73   823 AM  9/26  CWOP
   2 SE West Milford     1.70   700 AM  9/26  CoCoRaHS
   2 NW Ringwood         1.64   745 AM  9/26  IFLOWS
   Hawthorne             1.63   825 AM  9/26  CWOP
   2 NNE Green Pond      0.84   803 AM  9/26  AWS

...Union County...
   Springfield           2.36   700 AM  9/26  CoCoRaHS
   Scotch Plains         1.98   820 AM  9/26  CWOP
   Westfield             1.91   600 AM  9/26  CoCoRaHS
   Newark Airport        1.91   800 AM  9/26  ASOS
   New Providence        1.83   730 AM  9/26  CoCoRaHS
   1 NNW Cranford        1.65   430 AM  9/26  CoCoRaHS
   Linden Airport        1.61   755 AM  9/26  AWOS
   Roselle Park          1.28   820 AM  9/26  CWOP   
   
New York

LOCATION          STORM TOTAL     TIME/DATE   COMMENTS
                     RAINFALL           OF
                     /INCHES/   MEASUREMENT
...Kings County...
   2 ENE Coney Island    1.08   815 AM  9/26  CWOP
   1 WNW Bay Ridge       1.06   812 AM  9/26  CWOP
   1 SE Battery Park     0.89   700 AM  9/26  CoCoRaHS
   1 WNW Rockaway Beach  0.86   805 AM  9/26  CWOP

...Nassau County...
   Seaford               2.07  1002 PM  9/25  Social Media
   Plainview             1.95   800 AM  9/26  CoCoRaHS
   1 SSE North Wantagh   1.92   800 AM  9/26  CoCoRaHS
   Syosset               1.75   800 AM  9/26  Co-Op Observer
   1 SW East Massapequa  1.67   817 AM  9/26  CWOP
   1 SSW Hicksville      1.57   815 AM  9/26  CWOP
   1 ENE Hicksville      1.55   640 AM  9/26  CoCoRaHS
   Thomaston             1.28   802 AM  9/26  AWS
   1 E Jericho           1.25   615 AM  9/26  CoCoRaHS
   Lynbrook              1.16   700 AM  9/26  CoCoRaHS
   Port Washington       1.11   727 AM  9/26  CoCoRaHS
   East Rockaway         1.03   825 AM  9/26  CWOP
   Matinecock            0.80   802 AM  9/26  AWS
   1 WNW Muttontown      0.79   103 AM  9/26  CWOP
   Carle Place           0.75   819 AM  9/26  CWOP

...New York County...
   1 ESE Greenwich Vill  2.68   803 AM  9/26  AWS
   Central Park          2.08   800 AM  9/26  ASOS
   1 W Triborough Bridg  1.67   700 AM  9/26  CoCoRaHS

...Orange County...
   Monroe                2.33   645 PM  9/25  Trained Spotter
   3 WSW Pine Bush       2.05   800 AM  9/26  CoCoRaHS
   2 SW Greenwood Lake   1.79   800 AM  9/26  CoCoRaHS
   West Point            1.66   655 PM  9/25  RAWS
   Washingtonville       1.50   800 PM  9/25  Trained Spotter
   1 SSW Newburgh        1.50   813 AM  9/26  CWOP
   New Windsor           1.43   821 AM  9/26  CWOP
   3 W Warwick           1.14   700 AM  9/26  CoCoRaHS

...Putnam County...
   3 N Fahnestock State  1.72   620 AM  9/26  CoCoRaHS
   4 N Carmel            1.69   800 AM  9/26  Co-Op Observer
   3 S Fishkill          1.58   625 AM  9/26  CoCoRaHS
   Watchtower Training   0.97   736 AM  9/26  OTHER
   Croton Falls          0.84   735 AM  9/26  OTHER

...Queens County...
   Whitestone            2.50   700 AM  9/26  CoCoRaHS
   Whitestone            2.20   822 AM  9/26  CWOP
   Bellerose             1.82   821 AM  9/26  CWOP
   2 NW Ozone Park       1.35   700 AM  9/26  CoCoRaHS
   Astoria               1.18   821 AM  9/26  CWOP
   NYC/JFK Airport       1.13   800 AM  9/26  ASOS
   1 S Jackson Heights   0.95   804 AM  9/26  CWOP
   NYC/La Guardia        0.95   751 AM  9/26  ASOS

...Richmond County...
   1 ENE Annadale        1.95   700 AM  9/26  CoCoRaHS
   Richmondtown          1.54   500 PM  9/25  CoCoRaHS

...Rockland County...
   Piermont              3.49   822 AM  9/26  CWOP
   1 WSW West Nyack      2.84   700 AM  9/26  CoCoRaHS
   Nanuet                2.63   730 AM  9/26  IFLOWS
   Montebello            2.33   821 AM  9/26  CWOP
   Montebello            1.81   730 AM  9/26  GOES
   Congers               1.71   750 PM  9/25  Fire Dept/Rescue
   Sloatsburg            1.39   815 AM  9/26  CWOP

...Suffolk County...
   Setauket              4.53  1030 PM  9/25  Public
   Port Jefferson Stati  4.27   820 AM  9/26  CoCoRaHS
   1 WNW Hauppauge       4.00   800 AM  9/26  CoCoRaHS
   Commack               3.53   700 AM  9/26  CoCoRaHS
   Commack               3.39   915 PM  9/25  Public
   1 WSW Commack         3.39   700 AM  9/26  CoCoRaHS
   1 ENE Kings Park      3.22   815 AM  9/26  CWOP
   Baiting Hollow        2.93   844 AM  9/26  Co-Op Observer
   West Babylon          2.93   925 PM  9/25  Public
   1 SSW Nesconset       2.73   757 AM  9/26  CoCoRaHS
   Dowling Sea Com       2.72   900 AM  9/26  Co-Op Observer
   Nesconset Highway     2.72   600 AM  9/26  CoCoRaHS
   Miller Place          2.62   800 AM  9/26  CWOP
   1 SW Melville         2.48   700 AM  9/26  CoCoRaHS
   Lake Ronkonkoma       2.47   630 AM  9/26  CoCoRaHS
   1 ESE Lake Grove      2.47   816 AM  9/26  CWOP
   Farmingdale Airport   2.43   800 AM  9/26  ASOS
   Smithtown             2.41   845 PM  9/25  Public
   3 WSW Gilgo State Pa  2.26  1101 PM  9/25  CWOP
   1 SW Deer Park        2.23   825 AM  9/26  CWOP
   Melville              2.22   824 AM  9/26  CWOP
   Amityville            2.21   800 AM  9/26  CoCoRaHS
   1 NNE Islip Terrace   2.10   800 AM  9/26  CoCoRaHS
   1 NW Babylon          2.07   801 AM  9/26  CWOP
   Brightwaters          1.98   700 AM  9/26  CoCoRaHS
   Orient                1.97   949 AM  9/26  Trained Spotter
   West Islip            1.93   740 AM  9/26  CoCoRaHS
   East Hampton          1.91   755 AM  9/26  AWOS
   Bay Shore             1.81   700 AM  9/26  CoCoRaHS
   Montauk Airport       1.79   800 AM  9/26  ASOS
   1 WSW Fishers Island  1.78   700 AM  9/26  CoCoRaHS
   Centerport            1.77   700 AM  9/26  Co-Op Observer
   Upton                 1.67   800 AM  9/26  NWS Office
   Greenlawn             1.65   801 AM  9/26  CWOP
   1 W Sunken Meadow Pa  1.55   820 AM  9/26  CWOP
   Farmingville          1.51   700 AM  9/26  CoCoRaHS
   1 E Asharoken         1.50   700 AM  9/26  CoCoRaHS
   West Islip            1.50   640 PM  9/25  Trained Spotter
   1 ESE Islandia        1.50   800 AM  9/26  CoCoRaHS
   Bridgehampton         1.50   700 AM  9/26  Co-Op Observer
   Farmingville          1.49   822 AM  9/26  CWOP
   Southampton           1.45   903 AM  9/26  Trained Spotter
   Islip Airport         1.45   800 AM  9/26  ASOS
   1 SE West Islip       1.38   824 AM  9/26  CWOP
   Riverhead             1.37   715 AM  9/26  CoCoRaHS
   2 S Brookhaven Natio  1.32   600 AM  9/26  CoCoRaHS
   Fort Salonga          1.32   802 AM  9/26  AWS
   Orient State Park     1.26   800 AM  9/26  Co-Op Observer
   Centerport            1.24   800 AM  9/26  CoCoRaHS
   Shirley Airport       1.12   800 AM  9/26  ASOS
   Mastic Beach          1.11   823 AM  9/26  CWOP
   Cutchogue             1.11   803 AM  9/26  CWOP
   1 S Brookhaven        1.08   815 AM  9/26  CWOP
   1 S Hampton Bays      1.08   821 AM  9/26  CWOP
   2 SW Shelter Island   1.05   757 AM  9/26  CoCoRaHS
   Cutchogue             1.04   818 AM  9/26  CWOP
   1 E Middle Island     1.04   825 AM  9/26  CWOP
   Oakdale               0.92   801 AM  9/26  CWOP
   Jamesport             0.92   900 AM  9/26  CoCoRaHS
   Blue Point            0.85   800 AM  9/26  CoCoRaHS
   Patchogue             0.83   700 AM  9/26  CoCoRaHS
   1 ESE Ridge           0.79  1159 PM  9/25  CoCoRaHS
   Blue Point            0.79   815 AM  9/26  CWOP
   Westhampton Airport   0.78   800 AM  9/26  ASOS
   1 E East Moriches     0.76   820 AM  9/26  CWOP
   1 SSE Sayville        0.75   700 AM  9/26  CoCoRaHS

...Westchester County...
   1 NE Irvington        4.58   817 AM  9/26  CWOP
   White Plains Airport  4.43   800 AM  9/26  ASOS
   Elmsford              4.30   800 PM  9/25  CoCoRaHS
   Armonk                3.83   800 AM  9/26  CoCoRaHS
   1 WSW Armonk          3.21   811 AM  9/26  CWOP
   Mamaroneck            2.92   802 AM  9/26  AWS
   1 WSW Hawthorne       2.80   818 AM  9/26  CWOP
   1 ENE Eastchester     2.72   817 AM  9/26  CWOP
   Armonk                2.70   445 PM  9/25  Trained Spotter
   Jefferson Valley      2.64   803 AM  9/26  AWS
   4 WNW Ridgefield      2.41   715 AM  9/26  CoCoRaHS
   Kensico Reservoir     2.26   735 AM  9/26  OTHER
   Yorktown Heights      1.96   800 AM  9/26  CoCoRaHS
   Ward Pound Ridge      1.80   737 AM  9/26  OTHER
   1 ESE Putnam Valley   1.78   700 AM  9/26  CoCoRaHS
   Shrub Oak             1.78   645 AM  9/26  Co-Op Observer
   Pelham                1.72   802 AM  9/26  AWS
   N Peekskill           1.27   800 AM  9/26  CoCoRaHS
   New Croton Reservoir  1.06   735 AM  9/26  OTHER
   3 ESE Golden`s Bridg  0.76   802 AM  9/26  AWS        
   
   
 


 

 
Local Storm Reports
 
locriver
 
Each icon on the map above are locations of the flash flooding reports during the event. A more detailed list of the flash flooding reports in the OKX county warning area can be found below.
 

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1142 AM     FLASH FLOOD      NEWARK                  40.72N  74.17W
09/25/2018                   ESSEX              NJ   DEPT OF HIGHWAYS

            ALL LANES CLOSED ON US 1 & 9 APPROACHING PULASKI SKYWAY
            DUE TO FLOODING

1142 AM     FLASH FLOOD      NEWARK                  40.72N  74.17W
09/25/2018                   ESSEX              NJ   DEPT OF HIGHWAYS

            ALL LANES CLOSED DUE TO FLOODING ON US 1&9 NORTHBOUND
            APPROACHING WILSON AVENUE.

1203 PM     FLASH FLOOD      SECAUCUS                40.78N  74.06W
09/25/2018                   HUDSON             NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 3 WESTBOUND AREA OF NJ TURNPIKE-EASTERN
            SPUR.

1203 PM     FLASH FLOOD      BAYONNE                 40.66N  74.11W
09/25/2018                   HUDSON             NJ   SOCIAL MEDIA

            CAR STUCK IN FLOODED ROADWAY AT ROUTE 440 NEAR PORT
            JERSEY BOULEVARD SOUTHBOUND.

1205 PM     FLASH FLOOD      1 NNW WEST BERGEN       40.72N  74.09W
09/25/2018                   HUDSON             NJ   DEPT OF HIGHWAYS

            FLOODING ON US 1 AND 9 TRUCK ROUTE BOTH DIRECTIONS
            APPROACHING NJ 440 WITH ALL LANES CLOSED.

1210 PM     FLASH FLOOD      KEARNY                  40.75N  74.12W
09/25/2018                   HUDSON             NJ   FIRE DEPT/RESCUE

            PORTIONS OF CENTRAL AVENUE IMPASSABLE DUE TO 3 TO 4
            FEET OF STANDING WATER.

1211 PM     FLASH FLOOD      BAYONNE                 40.66N  74.11W
09/25/2018                   HUDSON             NJ   DEPT OF HIGHWAYS

            RAMP CLOSED DUE TO FLOODING ON NJ TURNPIKE-HUDSON
            COUNTY EXTENSION OUTSIDE EXIT INTERCHANGE 14A-NJ 440A
            BAYONNE BRIDGE.

1211 PM     FLASH FLOOD      NEWARK                  40.72N  74.17W
09/25/2018                   ESSEX              NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ TURNPIKE AT INTERCHANGE 15E. RAMP CLOSED
            FROM ROUTE 1&9 NORTH TO THE TURNPIKE TOLL PLAZA.

1221 PM     FLASH FLOOD      JERSEY CITY             40.71N  74.06W
09/25/2018                   HUDSON             NJ   DEPT OF HIGHWAYS

            ALL LANES CLOSED DUE TO FLOODING ON US 1&9 TRUCK ROUTE
            BOTH DIRECTIONS AT CHARLOTTE CIRCLE.

1227 PM     FLASH FLOOD      NEWARK                  40.72N  74.17W
09/25/2018                   ESSEX              NJ   DEPT OF HIGHWAYS

            FLOODING ON US 1&9 LOCAL LANES NORTHBOUND APPROACHING
            DELANCEY STREET.

1234 PM     FLASH FLOOD      MARION                  40.74N  74.08W
09/25/2018                   HUDSON             NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 7 EASTBOUND APPROACHING CHARLOTTE CIRCLE
            WITH ALL LANES CLOSED.

0102 PM     FLASH FLOOD      NORTH HACKENSACK        40.91N  74.03W
09/25/2018                   BERGEN             NJ   LAW ENFORCEMENT

            NEWBRIDGE ROAD CLOSED IN BOTH DIRECTIONS FROM MAIN
            STREET EASTBOUND TO NEW MILFORD BORDER.

0113 PM     FLASH FLOOD      ENGLEWOOD CLIFFS        40.88N  73.95W
09/25/2018                   BERGEN             NJ   TRAINED SPOTTER

            VEHICLE STUCK IN FLOOD WATER ON DEBORAH TERRACE.

0122 PM     FLASH FLOOD      BRONX                   40.85N  73.87W
09/25/2018                   BRONX              NY   BROADCAST MEDIA

            MOSHULU PARKWAY AT I87 INTERCHANGE FLOODED.

0155 PM     FLASH FLOOD      1 SSW KEARNY            40.73N  74.13W
09/25/2018                   ESSEX              NJ   DEPT OF HIGHWAYS

            FLOODING ON PULASKI SKYWAY NORTHBOUND AT US 1 AND 9
            TRUCK ROUTE AT RAYMOND BLVD WITH ALL LANES CLOSED

0212 PM     FLASH FLOOD      WHITE PLAINS            41.02N  73.76W
09/25/2018                   WESTCHESTER        NY   DEPT OF HIGHWAYS

            BRONX RIVER PARKWAY CLOSED DUE TO FLOODING BETWEEN
            GREENACRES AVENUE AND TARRYTOWN ROAD.

0320 PM     FLASH FLOOD      OLD GREENWICH           41.02N  73.56W
09/25/2018                   FAIRFIELD          CT   TRAINED SPOTTER

            SEVERAL STREETS FLOODED IN TOWN INCLUDING LOCKWOOD
            AVENUE AND SOUND BEACH AVENUE AND BENJAMIN STREET WITH
            AT LEAST TWO FEET OF STANDING WATER AND IMPASSABLE ROADS

0323 PM     FLASH FLOOD      RIDGEFIELD PARK         40.85N  74.02W
09/25/2018                   BERGEN             NJ   DEPT OF HIGHWAYS

            FLOODING ON US 46 EASTBOUND NEAR AREA OF NEW JERSEY
            TURNPIKE WITH ALL LANES CLOSED

0325 PM     FLASH FLOOD      1 W OLD GREENWICH       41.02N  73.61W
09/25/2018                   FAIRFIELD          CT   TRAINED SPOTTER

            RUNNING MUD AND WATER OVER HALFWAY UP TIRES AT DAVIS
            AVENUE AND BRUCE PARK DRIVE.

0330 PM     FLASH FLOOD      STAMFORD                41.02N  73.56W
09/25/2018                   FAIRFIELD          CT   NEWSPAPER

            A SCHOOL BUS WITH 31 CHILDREN WAS STRANDED ON DALE
            STREET DUE TO FLOODING AND HAD TO BE RESCUED.            
            

0345 PM     FLASH FLOOD      OLD GREENWICH           41.02N  73.56W
09/25/2018                   FAIRFIELD          CT   TRAINED SPOTTER

            FLOODING CONTINUES AT WESSKUM ROAD AND SOUND BEACH
            AVENUE, AND HARDING ROAD AND LADDINS ROCK ROAD WITH
            ROADS CLOSED

0345 PM     FLASH FLOOD      OLD GREENWICH           41.02N  73.56W
09/25/2018                   FAIRFIELD          CT   TRAINED SPOTTER

            SHADY BROOK LANE AND MIDBROOK LANE IMPASSABLE WITH UP
            TO TWO FEET OF WATER.

0415 PM     FLASH FLOOD      BAYSIDE                 40.77N  73.78W
09/25/2018                   QUEENS             NY   TRAINED SPOTTER

            ON BELL BLVD ALL SOUTHBOUND LANES CLOSED AT 208TH PLACE
            WITH TWO FEET OF STANDING WATER WITH POLICE ON SCENE

0430 PM     FLASH FLOOD      EAST NORWALK            41.11N  73.41W
09/25/2018                   FAIRFIELD          CT   SOCIAL MEDIA

            I 95 CLOSED SOUTHBOUND AT EAST AVENUE EXIT 16 WITH CAR
            STUCK IN WATER AND POLICE ON SCENE

0430 PM     FLASH FLOOD      SOUTH NORWALK           41.09N  73.42W
09/25/2018                   FAIRFIELD          CT   TRAINED SPOTTER

            SEVERE STREET FLOODING REPORTED AT MEADOW STREET AND
            WILSON AVENUE WITH CAR STUCK IN WATER AND SUBMERGED
            HALFWAY

0515 PM     FLASH FLOOD      TOILSOME HILL           41.21N  73.23W
09/25/2018                   FAIRFIELD          CT   SOCIAL MEDIA

            THE HORSE HAVEN BROOK IS OVER ITS BANKS FLOODING THE
            AREA OF PARK AVENUE AND BRION DRIVE. MULTIPLE CARS ARE
            SUBMERGED IN SEVERAL FEET OF FLOWING FLOOD WATERS.

0530 PM     FLASH FLOOD      HACKENSACK              40.89N  74.05W
09/25/2018                   BERGEN             NJ   TRAINED SPOTTER

            ESSEX AND STATE STREETS REMAIN CLOSED WITH BOATS
            DEPLOYED FOR POSSIBLE RESCUES.

0530 PM     FLASH FLOOD      HACKENSACK              40.89N  74.05W
09/25/2018                   BERGEN             NJ   LAW ENFORCEMENT

            RAILROAD AVENUE AND SUSSEX STREET REMAIN FLOODED WITH
            ROAD CLOSED

0530 PM     FLASH FLOOD      HACKENSACK              40.89N  74.05W
09/25/2018                   BERGEN             NJ   LAW ENFORCEMENT

            FLOODING ONGOING ALONG SOUTH NEWMAN STREET

0549 PM     FLASH FLOOD      FAIRFIELD               41.13N  73.28W
09/25/2018                   FAIRFIELD          CT   EMERGENCY MNGR

            NUMEROUS PEOPLE TRAPPED IN VEHICLES ON BENNETT STREET

0600 PM     FLASH FLOOD      HACKENSACK              40.89N  74.05W
09/25/2018                   BERGEN             NJ   LAW ENFORCEMENT

            FLOODING ONGOING IN NORTH END OF TOWN ALONG COMMERCE
            WAY WITH EMERGENCY MANAGEMENT EMPLOYING MITIGATION
            METHODS

0600 PM     FLASH FLOOD      EASTON                  41.24N  73.31W
09/25/2018                   FAIRFIELD          CT   EMERGENCY MNGR

            50 WATER RESCUES PERFORMED BY LOCAL FIRE DEPARTMENT AND
            EMERGENCY MANAGEMENT

0615 PM     FLASH FLOOD      HACKENSACK              40.89N  74.05W
09/25/2018                   BERGEN             NJ   FIRE DEPT/RESCUE

            HACKENSACK FIRE DEPARTMENT HAS RESCUED OVER 18 PEOPLE
            FROM STRANDED CARS IN FLOOD WATERS. MANY ROADS CLOSED
            AND IMPASSABLE.
            
0615 PM     FLASH FLOOD      ORANGE                  41.28N  73.03W
09/25/2018                   NEW HAVEN          CT   LAW ENFORCEMENT

            NUMEROUS ROAD CLOSURES DUE TO FLOODING AROUND TOWN
            INCLUDING ROUTE 34 (DERBY AVENUE) AT ROUTE 114,
            GLENBROOK ROAD, MAPLEDALE ROAD, CHESTNUT RIDGE ROAD,
            EDDISON ROAD, GRASSY HILL ROAD, OPEKUN ROAD, AND
            ARROWHEAD ROAD.            
            
0630 PM     FLASH FLOOD      FAIRFIELD               41.13N  73.28W
09/25/2018                   FAIRFIELD          CT   NEWSPAPER

            FIREFIGHTERS RESCUED MOTHER AND CHILD FROM FLOODED CAR
            AT BROOKSIDE AND SAMP MORTOR.            
            
0640 PM     FLASH FLOOD      HAMDEN                  41.37N  72.90W
09/25/2018                   NEW HAVEN          CT   NEWSPAPER

            INTERSECTION OF CLOVER CIRCLE AND LAKE STREET
            IMPASSABLE DUE TO FLOODING.      
            
0640 PM     FLASH FLOOD      MIDDLETOWN              41.55N  72.65W
09/25/2018                   MIDDLESEX          CT   LAW ENFORCEMENT

            ALL LANES CLOSED RT 9 SOUTHBOUND BETWEEN EXITS 16 AND
            11                  

0700 PM     FLASH FLOOD      1 WNW SPRING GLEN       41.37N  72.92W
09/25/2018                   NEW HAVEN          CT   SOCIAL MEDIA

            DIXWELL AVENUE NEAR WILBUR CROSS PARKWAY CLOSED DUE TO
            FLOODING. SEVERAL CARS STRANDED WITH FLOOD WATERS TO
            ROOFTOPS OF CARS.

0715 PM     FLASH FLOOD      HAMDEN                  41.37N  72.90W
09/25/2018                   NEW HAVEN          CT   SOCIAL MEDIA

            MORSE STREET IN HAMDEN CLOSED DUE TO FLOODING. ONE CAR
            STRANDED IN FLOOD WATERS.

0715 PM     FLASH FLOOD      BRIDGEPORT              41.19N  73.20W
09/25/2018                   FAIRFIELD          CT   EMERGENCY MNGR

            15 WATER RESCUES FROM OUT OF VEHICLES PEFORMED BY LOCAL
            FIRE DEPARTMENT

0730 PM     FLASH FLOOD      MERIDEN                 41.54N  72.80W
09/25/2018                   NEW HAVEN          CT   TRAINED SPOTTER

            ROAD CLOSURES REPORTED IN TOWN

0800 PM     FLASH FLOOD      GUILFORD                41.28N  72.68W
09/25/2018                   NEW HAVEN          CT   TRAINED SPOTTER

            RT 146 BETWEEN MADDISON AND GUILFORD CLOSED DUE TO
            FLOODING.            

0800 PM     FLASH FLOOD      ANSONIA                 41.34N  73.07W
09/25/2018                   NEW HAVEN          CT   LAW ENFORCEMENT

            ROAD CAVED IN ON CRESCENT STREET DUE TO FLOOD WATERS

0800 PM     FLASH FLOOD      ANSONIA                 41.34N  73.07W
09/25/2018                   NEW HAVEN          CT   LAW ENFORCEMENT

            MULTIPLE ROAD CLOSURES ACROSS TOWN DUE TO FLOOD WATERS

0811 PM     FLASH FLOOD      1 NE PORT JEFFERSON STA 40.93N  73.05W
09/25/2018                   SUFFOLK            NY   EMERGENCY MNGR

            ROUTE 112 NEAR MAPLE AVENUE IMPASSABLE

0815 PM     FLASH FLOOD      MIDDLETOWN              41.55N  72.65W
09/25/2018                   MIDDLESEX          CT   LAW ENFORCEMENT

            CT STATE POLICE IS REPORTING ALL SOUTHBOUND LANES ON
            ROUTE 9 FROM MIDDLETOWN LIGHTS (EXIT 16) TO EXIT 11 ARE
            CLOSED DUE TO FLOODING.
            
0815 PM     FLASH FLOOD      MIDDLETOWN              41.55N  72.65W
09/25/2018                   MIDDLESEX          CT   DEPT OF HIGHWAYS

            ROUTE 155 CLOSED BETWEEN LEE STREET AND MILLBROOK ROAD
            DUE TO FLOOD WATERS            

0820 PM     FLASH FLOOD      STONY BROOK             40.91N  73.13W
09/25/2018                   SUFFOLK            NY   EMERGENCY MNGR

            SOUTH ENTRANCE TO STONY BROOK HOSPITAL FLOODED AND
            IMPASSABLE

0830 PM     FLASH FLOOD      PORT JEFFERSON          40.95N  73.06W
09/25/2018                   SUFFOLK            NY   BROADCAST MEDIA

            WIDESPREAD FLASH FLOODING ACROSS THE VILLAGE OF PORT
            JEFFERSON, WITH SOME OF THE MOST SIGNIFICANT FLOODING ON
            MAIN STREET NEAR MAPLE PLACE. WATER IS 3 TO 4 FEET HIGH
            IN SEVERAL LOCATIONS. MULTIPLE CARS STUCK IN FLOOD
            WATERS.

0832 PM     FLASH FLOOD      LEBANON                 41.66N  72.24W
09/25/2018                   NEW LONDON         CT   AMATEUR RADIO

            SEVERAL ROADS IMPASSABLE/CLOSED DUE TO FLOODING.
            BASEMENTS FLOODED ON GOSHEN HEIGHTS ROAD AND WATERMAN
            ROAD.

0832 PM     FLASH FLOOD      COLCHESTER              41.57N  72.33W
09/25/2018                   NEW LONDON         CT   AMATEUR RADIO

            ROUTE 16 NEAR LINWOOD CEMETERY IMPASSABLE/CLOSED DUE TO
            FLOODING.
            
0838 PM     FLASH FLOOD      EAST HADDAM             41.45N  72.46W
09/25/2018                   MIDDLESEX          CT   SOCIAL MEDIA

            SIGNIFICANT DAMAGE TO THE GOODSPEED MUSICAL REHEARSAL
            STUDIO AND PARKING LOT DUE TO FLASH FLOODING.    
            
0838 PM     FLASH FLOOD      CHESTER                 41.40N  72.45W
09/25/2018                   MIDDLESEX          CT   SOCIAL MEDIA

            LIBERTY STREET BRIDGE WASHED OUT.       
            
0838 PM     FLASH FLOOD      EAST HADDAM             41.45N  72.46W
09/25/2018                   MIDDLESEX          CT   SOCIAL MEDIA

            NEPTUNE AVENUE BRIDGE WASHED OUT. 

0900 PM     FLASH FLOOD      PORT JEFFERSON          40.95N  73.06W
09/25/2018                   SUFFOLK            NY   DEPT OF HIGHWAYS

            ROUTE 25A CLOSED BETWEEN SHEEP PASTURE ROAD AND ROUTE
            112 - PATCHOGUE ROAD DUE TO FLOODING

0905 PM     FLASH FLOOD      LEBANON                 41.66N  72.24W
09/25/2018                   NEW LONDON         CT   HAM RADIO

            CAR STUCK IN FLOOD WATERS ON SANTA ANNA ROAD

0910 PM     FLASH FLOOD      FRANKLIN                41.60N  72.14W
09/25/2018                   NEW LONDON         CT   AMATEUR RADIO

            CAR STRANDED IN FLOOD WATERS ON POND ROAD.

0911 PM     FLASH FLOOD      FRANKLIN                41.60N  72.14W
09/25/2018                   NEW LONDON         CT   HAM RADIO

            CAR STUCK IN FLOOD WATERS ON POND ROAD

0930 PM     FLASH FLOOD      LEBANON                 41.66N  72.24W
09/25/2018                   NEW LONDON         CT   FIRE DEPT/RESCUE

            LEBANON FIRE DEPARTMENT IS MAKING MULTIPLE WATER
            RESCUES OF OCCUPANTS STUCK IN VEHICLES IN FLOOD WATERS.

0938 PM     FLASH FLOOD      MIDDLETOWN              41.55N  72.65W
09/25/2018                   MIDDLESEX          CT   DEPT OF HIGHWAYS

            ROUTE 55 CLOSED BETWEEN LEE STREET AND MILLBROOK ROAD
            DUE TO FLOOD WATERS

0950 PM     FLASH FLOOD      LEBANON                 41.66N  72.24W
09/25/2018                   NEW LONDON         CT   HAM RADIO

            A SECTION OF ROUTE 207 IS FLOODED AND IMPASSABLE WITH A
            CAR STUCK IN FLOOD WATERS AT SMITH ROAD AND GOSHEN HILL
            ROAD
                       
                                          
   


 
 
 


 

River Flooding
 
locriver
 
The Yantic River at Yantic reached major flood stage early Wednesday morning September 26, and crested at 12.53 feet at 2:47 am. This is the highest level since March 30, 2010 when the Yantic crested at 13.23 feet. The 12.53 feet is also the 6th highest level of the river on record. Below is the River flood warning polygon that was issued as the river rose rapidly. More details on the river flood warnings issued for the Yantic can be found HERE.
 
locriver
 
 

 
 
locriver
 
The Saddle River at Lodi, New Jersey crested at 5.84 feet at 9:30 pm on September 25, which is just below minor flood stage. The river was forecast to go into minor flood stage, so a river flood warning was issued at 6:51 pm (warning polygon below). More details on this river flood warning for the Saddle River at Lodi can be found HERE.
locriver
 
 

 
 
locriver
 
The Bronx River at Bronx Botanical Gardends reached major flood stage on September 25, 2018 cresting at 4.16 feet at 9:31 pm. This river is not a River Forecast Center (RFC) forecast point, so any flooding here was handled with Flash Flood Warnings.
 
 

 
 
locriver
 
The Quinnipiac River above Wallingford, Connecticut reached minor flood stage on September 25, 2018 cresting at 10.09 feet at 11:15 pm. This river is not a River Forecast Center (RFC) forecast point, so any flooding here was handled with Flash Flood Warnings.
 
 
Flash Flood Warnings
 
 
A total of 21 flash lood warnings were issued during this event. This number includes those warnings that were extended in time. The preliminary average lead time was 61 minutes. Hover over each time below to see the radar at the time of warning issuance and the polygon associated with the warning. These are just for the first issuance of the warning and do not include extensions. For more complete warning information, including time extensions to these warnings, please see the link below.
 

Flash Flood Warning Text

Meteorology
 
More information to be updated soon
 
Doppler Radar Analysis
 
National Weather Service Doppler KOKX Radar Animation beginning at 9:00 am Sepemtber 25 through 12:30 am September 26. The data in this animation is about every 5 to 10 minutes.
 
 
One mechanism that allowed the heavy rain to persist for a long duration was a convergence zone, which can be seen on radar data. The image on the left is reflectivity and the image on the right is velocity at 3:05 pm. There is a clear zone where winds are going away from the radar (reds) and hitting an area of winds going towards the radar (green). The convergence of these winds is helping to supply upward motion for heavy rainfall in this zone. This was a common signature throughout the event.
 
 
 
Looking at the radar in a vertical cross-section reveals the shallow nature of the convection. The data above is from 6:11 pm and the beginning and end of the cross section (right) is shown by the white line on the horizontal radar image (left). The freezing level is indicated by the blue line and -20°C is indicated by the red line. The reflectivity within this corridor was shallow with much of the highest returns below the freezing level.  The environment consisted of tropical mositure with warm rain processes leading to the flooding rains.  Very little reflectivity made it above -20°C, which in deep convection would mean much more mixed-phase precipitation processes.
 
 

 
Surface and Upper-Air Analysis
 
 
Weather Prediction Center (WPC) Surface Analysis 5 am Tuesday 9/25 through 2 am Wednesday 9/26
Hover over the times above to view Weather Prediction Center (WPC) Surface Analysis beginning at 5 am on September 25 and every 3 hours through 2 am on September 26.  

 

Surface Moisture Convergence and Mixing Ratio
Hover over times above to view surface moisture convergence (blue contours) and mixing ratio (green contours) beginning at 10 am on September 25 and every 2 hours until 12 am on September 26.   

 

1000 - 925 mb Frontogenesis, Heights(m) and Winds(kt)
Hover over times above to view 1000-925mb analysis beginning at 10 am on September 25 and every 2 hours until 12 am on September 26.   

 

Precipitable Water (in) and 850 mb Moisture Transport Vectors
Hover over times above to view Precipitable Water (Inches, green fill) and 850 mb moisture transport vectors beginning at 10 am on September 25 and every 2 hours until 12 am on September 26.   

 

Surface Based Convective Available Potential Energy (CAPE)
Hover over times above to view Surface Based Convective Available Potential Energy (CAPE, J/kg) and Surface Based Convective Inhibition (CIN, J/kg) beginning at 10 am on September 25 and every 2 hours until 12 am on September 26.   

 

 
 

 
Annual Recurrence Interval (ARI) Analysis for Rainfall
 
Below is from the NOAA ATLAS 14 showing the point precipitation frequency estimates. Durham, CT is highlighted where over 7 inches of rain fell in about 6 hours. That would make it a 1 in 1000 year event (.01 chance of occurrence in any given year). Other locations that saw 5 to 7 inches across CT would likely fall in the 1 in 500-1000 year occurrence.
 
 


 

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