Overview
Fast Facts
Event Snow Totals
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1122 AM CST MON DEC 12 2016
...2-DAY SNOWFALL ROUND-UP...
THE FOLLOWING ARE SNOW AMOUNTS FOR THE PREVIOUS 2 DAYS
AS MEASURED IN THE MORNING BY NWS COOPERATIVE OBSERVERS
AND COCORAHS OBSERVERS. OBSERVATIONS ARE USUALLY
TAKEN AT 7 AM.
2-DAY SNOW TOTALS FOR MONDAY (12/12/16)
AS OF 11:22 AM CST
ILLINOIS 2-DAY SNOW FALL
LOCATION (COUNTY): AMT(IN) REPORTS
HARVARD 3SSE (MCHENRY).......................11.7 (2)
BULL VALLEY 2WNW (MCHENRY)...................10.8 (2)
HARVARD (MCHENRY).............................9.5 (2)
RIVERWOODS (LAKE).............................9.3 (2)
LAKE ZURICH (LAKE)............................9.1 (2)
HIGHWOOD 1S (LAKE)............................9.0 (2)
GENOA (DE KALB)...............................8.8 (2)
WOODSTOCK 5NW (MCHENRY).......................8.7 (2)
WOODSTOCK 4SW (MCHENRY).......................8.5 (2)
WONDER LAKE 1WNW (MCHENRY)....................8.1 (2)
SCHAUMBURG 2E (COOK)..........................8.1 (2)
DOWNERS GROVE 0.4NNE (DU PAGE)...............11.7 (3)
ST. CHARLES (KANE)............................8.0 (2)
WAUKEGAN 2N (LAKE)............................7.9 (2)
ELK GROVE VILLAGE 1ESE (COOK).................7.9 (2)
OHARE (COOK)..................................7.8 (2)
LAKE VILLA 1SSW (LAKE)........................7.8 (2)
BEACH PARK 1W (LAKE)..........................7.8 (2)
ELGIN 2W (KANE)...............................7.8 (2)
HOFFMAN ESTATES 5W (COOK).....................7.8 (2)
ROSCOE 2SE (WINNEBAGO)........................7.7 (2)
ROSCOE 2ESE (WINNEBAGO).......................7.7 (2)
LAKE VILLA 2WSW (LAKE)........................7.7 (2)
BARRINGTON (LAKE).............................7.7 (2)
FOX LAKE 2SE (LAKE)...........................7.7 (2)
ELK GROVE VILLAGE 2WSW (COOK).................7.7 (2)
PARK FOREST (COOK)............................7.5 (2)
BUFFALO GROVE 2N (LAKE).......................7.5 (2)
LINCOLNSHIRE 1N (LAKE)........................7.5 (2)
GENEVA 4WSW (KANE)............................7.5 (2)
BOTANIC GARDENS (COOK)........................7.5 (2)
WILLOW SPRINGS (COOK).........................7.4 (2)
MUNDELEIN 2WNW (LAKE).........................7.4 (2)
GENEVA 1SSW (KANE)............................7.3 (2)
MUNDELEIN (LAKE)..............................7.2 (2)
MIDWAY COOP (COOK)............................7.0 (2)
ROCKFORD 1NW (WINNEBAGO)......................7.0 (2)
BATAVIA 1WSW (KANE)...........................7.0 (2)
ROSELLE 1ESE (DU PAGE)........................7.0 (2)
PARK RIDGE 1WNW (COOK)........................7.0 (2)
BATAVIA 2WNW (KANE)...........................6.9 (2)
MCHENRY (MCHENRY).............................6.7 (2)
PALATINE 1E (COOK)............................6.7 (2)
ELMHURST 1ESE (DU PAGE).......................6.7 (2)
ROCKFORD 2ENE (WINNEBAGO).....................6.5 (2)
NAPERVILLE 1NW (DU PAGE)......................6.5 (2)
OAK PARK 2S (COOK)............................6.5 (2)
PARK RIDGE (COOK).............................6.4 (2)
ROCKFORD (WINNEBAGO)..........................6.3 (2)
LISLE 1SE (DU PAGE)...........................6.3 (2)
LINCOLNWOOD 2E (COOK).........................6.2 (2)
MONEE (WILL)..................................6.1 (2)
CRETE 3E (WILL)...............................6.1 (2)
BATAVIA (KANE)................................6.1 (2)
BYRON 3N (OGLE)...............................6.0 (2)
NORTH AURORA 2NE (KANE).......................6.0 (2)
ELBURN (KANE).................................6.0 (2)
OAK LAWN 2WNW (COOK)..........................6.0 (2)
ELBURN (KANE).................................6.0 (2)
AMBOY (LEE)...................................6.0 (2)
SUGAR GROVE 1NE (KANE)........................5.9 (2)
LISLE (DU PAGE)...............................5.9 (2)
PEOTONE (WILL)................................5.8 (2)
LA GRANGE PARK 1SSW (COOK)....................5.8 (2)
ROMEOVILLE (WILL).............................5.6 (2)
DE KALB (DE KALB).............................5.6 (2)
ROGERS PARK 2SW (COOK)........................5.6 (2)
NEW LENOX 2SE (WILL)..........................5.5 (2)
ST. CHARLES 6NW (KANE)........................5.5 (2)
ELGIN 1S (KANE)...............................5.5 (2)
NAPERVILLE 2SE (DU PAGE)......................5.5 (2)
SOMONAUK 2NE (DE KALB)........................5.5 (2)
LINCOLNWOOD 3E (COOK).........................5.5 (2)
CHICAGO RIDGE (COOK)..........................5.5 (2)
CHICAGO 6ESE (COOK)...........................5.5 (2)
ELGIN (KANE)..................................5.5 (2)
CAPRON (BOONE)................................5.4 (2)
BURR RIDGE 2SW (DU PAGE)......................5.3 (2)
LANSING (COOK)................................5.2 (2)
PARK FOREST 1SW (COOK)........................5.2 (2)
HOMER GLEN 1ENE (WILL)........................5.1 (2)
BOLINGBROOK 3NE (DU PAGE).....................5.1 (2)
JOLIET LOCK/DAM (WILL)........................5.0 (2)
DE KALB (DE KALB).............................5.0 (2)
MANHATTAN (WILL)..............................4.9 (2)
MANHATTAN 5ENE (WILL).........................4.9 (2)
PLAINFIELD 5SW (KENDALL)......................4.9 (2)
CORTLAND (DE KALB)............................4.9 (2)
PALOS PARK 1SW (COOK).........................4.9 (2)
WORTH (COOK)..................................4.9 (2)
YORKVILLE 2SE (KENDALL).......................4.8 (2)
OAK LAWN (COOK)...............................4.7 (2)
NAPERVILLE 4SSW (WILL)........................4.7 (2)
LISLE MORTON ARB (DU PAGE)....................4.6 (2)
NEW LENOX 3E (WILL)...........................4.5 (2)
LOCKPORT 1SE (WILL)...........................4.5 (2)
GURNEE 2W (LAKE)..............................4.5 (1)
LAKE FOREST 2NNE (LAKE).......................4.5 (1)
PLAINFIELD (WILL).............................4.4 (2)
MOKENA 1W (WILL)..............................4.4 (2)
HOMEWOOD (COOK)...............................4.4 (2)
WILMINGTON 3SE (WILL).........................4.3 (2)
JOLIET 2N (WILL)..............................4.2 (2)
NEW LENOX 4SE (WILL)..........................4.2 (2)
MONTGOMERY 1SSE (KENDALL).....................4.0 (2)
EARLVILLE 3S (LA SALLE).......................4.0 (2)
DIXON (LEE)...................................4.0 (2)
STEWARD (LEE).................................3.9 (2)
ASHTON (LEE)..................................3.9 (2)
MANHATTAN 2SE (WILL)..........................3.8 (2)
OTTAWA 2N (LA SALLE)..........................3.8 (2)
PLAINFIELD 2SSE (WILL)........................3.6 (2)
OTTAWA 1NW (LA SALLE).........................3.5 (2)
DIXON 2SW (LEE)...............................3.5 (2)
MOMENCE (KANKAKEE)............................3.2 (2)
LA SALLE (LA SALLE)...........................3.2 (2)
CARBON HILL 3.1N (GRUNDY).....................3.2 (2)
COAL CITY 4NNW (GRUNDY).......................3.2 (2)
ST ANNE (KANKAKEE)............................3.0 (2)
MAZON 0.5ENE (GRUNDY).........................3.0 (2)
BOURBONNAIS (KANKAKEE)........................3.0 (2)
MORRIS 6ESE (GRUNDY)..........................2.9 (2)
OTTAWA (LA SALLE).............................2.7 (2)
MINOOKA (GRUNDY)..............................2.6 (2)
PAW PAW (LEE).................................2.5 (2)
MORRIS (GRUNDY)...............................2.5 (2)
BONFIELD 4WSW (KANKAKEE)......................2.5 (2)
ASHKUM 5.6E (IROQUOIS)........................2.4 (2)
STREATOR 4ENE (LA SALLE)......................2.0 (2)
WATSEKA 6.9WNW (IROQUOIS).....................2.0 (2)
MARSEILLES (LA SALLE).........................1.9 (2)
CHATSWORTH (LIVINGSTON).......................1.0 (2)
DWIGHT (LIVINGSTON)...........................1.0 (2)
CHATSWORTH (LIVINGSTON).......................1.0 (2)
INDIANA 2-DAY SNOW FALL
LOCATION (COUNTY): AMT(IN) REPORTS
CHESTERTON 4E (PORTER)........................7.5 (2)
CROWN POINT (LAKE)............................7.2 (2)
(KB9F)VALPARAISO 4S (PORTER)..................7.0 (2)
(W9MAL)MERRILLVILLE 2NNW (LAKE)...............7.0 (2)
VALPARAISO 6WSW (PORTER)......................6.6 (2)
LAKES OF THE FOUR SEASONS 2NNE (PORTER).......6.6 (2)
CROWN POINT 1N (LAKE).........................6.6 (2)
DE MOTTE 1NNW (JASPER)........................6.5 (2)
PORTAGE 3E (PORTER)...........................6.0 (2)
HEBRON 4NE (PORTER)...........................6.0 (2)
PORTER 1S (PORTER)............................5.9 (2)
VALPARAISO 6SSW (PORTER)......................5.5 (2)
DE MOTTE 4SW (JASPER).........................5.5 (2)
VALPARAISO 1SE (PORTER).......................5.3 (2)
REMINGTON (JASPER)............................5.2 (2)
VALPARAISO 4SW (PORTER).......................5.0 (2)
DE MOTTE 6S (JASPER)..........................4.5 (2)
DYER 1WNW (LAKE)..............................4.0 (2)
REMINGTON (JASPER)............................4.0 (2)
RENSSELAER (JASPER)...........................3.1 (2)
MOROCCO (NEWTON)..............................3.0 (2)
CROWN POINT 2WSW (LAKE).......................3.0 (2)
MOUNT AYR 2NNE (NEWTON).......................2.6 (2)
$$
Storm Reports
009
NWUS53 KLOT 192059
LSRLOT
Preliminary Local Storm Report...Summary
National Weather Service Chicago IL
359 PM CDT Tue Aug 19 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0835 PM Flash Flood 1 WSW Gary Airport 41.61N 87.44W
08/18/2025 Lake IN Public
Multiple public reports on social media of
basement flooding in East Chicago. Video
shows nearby street and yard flooding.
0835 PM Flash Flood 2 SSE Whiting 41.66N 87.48W
08/18/2025 Lake IN Public
US 20 closed due to flooding. Relayed via
social media.
0841 PM Flash Flood 1 SSE Whiting 41.66N 87.48W
08/18/2025 Lake IN Emergency Mngr
Indianapolis Blvd at 128th has about 3 feet
of water and is being closed to traffic.
0930 PM Flash Flood Whiting 41.69N 87.50W
08/18/2025 Lake IN Local Official
Combined sewer storage facility exceeded
capacity and overflowed due to heavy
rainfall. Relayed via broadcast media. Time
estimated based upon nearby reports.
0930 PM Flash Flood 1 WSW Whiting 41.68N 87.51W
08/18/2025 Lake IN Local Official
Multiple basements flooded in Hammond. Time
estimated based upon nearby reports. Relayed
via broadcast media.
0945 PM Flash Flood 2 SSE Gary Airport 41.59N 87.40W
08/18/2025 Lake IN Public
Public reports of basement flooding in Gary.
Time estimated based upon nearby reports.
0946 PM Flash Flood 2 E Hammond 41.59N 87.46W
08/18/2025 Lake IN Public
Public report of basement flooding in
Hessville neighborhood of Hammond near
Morton Elementary.
1000 PM Flash Flood Whiting 41.68N 87.50W
08/18/2025 Lake IN Public
Up to 3 feet of water on Indianapolis
Boulevard from 120th to 129th and the areas
of Dickey and Riley roads.
0633 PM Flash Flood 2 NE Roscoe 42.44N 88.99W
08/18/2025 Winnebago IL Public
Report relayed from mPING of street
flooding.
0725 PM Flash Flood 2 E Rockton 42.46N 89.04W
08/18/2025 Winnebago IL Public
Public report of street flooding near
Rockton Road and Dorr Road. Flooding
extending into nearby yards.
0652 PM Flash Flood Lockport 41.59N 88.05W
08/18/2025 Will IL Public
Report relayed from mPING of street
flooding.
0716 PM Flash Flood 1 SE Lockport 41.58N 88.05W
08/18/2025 Will IL Public
Report relayed from mPING of street
flooding.
0735 PM Flash Flood 2 SE Lockport 41.57N 88.03W
08/18/2025 Will IL Public
Report relayed from mPING of street
flooding.
0738 PM Flash Flood 2 E Mokena 41.54N 87.84W
08/18/2025 Will IL Public
Report relayed from mPING of street
flooding.
0755 PM Flash Flood 2 NE Mokena 41.55N 87.85W
08/18/2025 Will IL Public
At least 6 inches of water in underpass
under railroad tracks.
0900 PM Flash Flood 3 NW Bolingbrook 41.73N 88.12W
08/18/2025 Will IL NWS Employee
1 to 1.5 feet of standing water at the
intersection of Naper Blvd and 87th Street.
Around 1 foot of water on roads encroaching
on driveways in surrounding neighborhoods,
and at least 6 inches of flowing water at
Arlington and Riverwoods.
0910 PM Flash Flood Joliet 41.53N 88.08W
08/18/2025 Will IL Public
Reports of standing or flowing water on many
streets or intersections of Joliet.
1000 PM Flash Flood 2 ENE Mokena 41.54N 87.84W
08/18/2025 Will IL Public
Up to 3 feet of water on roadway.
1241 AM Flash Flood 2 E Mokena 41.54N 87.84W
08/19/2025 Will IL Public
Several reports from mPing of flooded and
closed roads in Mokena.
0600 PM Flash Flood Compton 41.69N 89.09W
08/18/2025 Lee IL Public
Video shared to social media shows several
inches of flowing water on roadways and a
parking lot in Compton.
0730 PM Flash Flood 1 N Paw Paw 41.71N 88.98W
08/18/2025 Lee IL Public
Report on social media of Paw Paw Road
flooded approximately half mile north of Paw
Paw. Possibly near creek crossing at Dredge
Road.
0730 PM Flash Flood 1 NW La Salle 41.34N 89.10W
08/18/2025 La Salle IL Public
Report relayed from mPING of street
flooding.
0800 PM Flash Flood 2 SE Yorkville 41.62N 88.43W
08/18/2025 Kendall IL Public
Street flooded with at least 6 inches of
standing water.
0809 PM Flash Flood 1 S Oswego 41.67N 88.36W
08/18/2025 Kendall IL Public
Report relayed from mPING of street
flooding.
0535 PM Flash Flood 2 NNE Woodridge 41.78N 88.04W
08/18/2025 DuPage IL NWS Employee
In Downers Grove, 6-8 inches of water
flowing over the road at Belmont near 59th
Street.
0610 PM Flash Flood 1 W Downers Grove 41.79N 88.02W
08/18/2025 DuPage IL Public
Report relayed from mPING of street
flooding.
0625 PM Flash Flood 1 NW Darien 41.76N 87.98W
08/18/2025 DuPage IL Public
Report on social media with photos showing
4-6 inches of water on Washington Street in
Darien, with flooding also impacting houses.
0836 PM Flash Flood 1 E Downers Grove 41.79N 88.00W
08/18/2025 DuPage IL Public
Report relayed from mPING of street
flooding.
0837 PM Flash Flood 3 NW Bolingbrook 41.73N 88.10W
08/18/2025 DuPage IL Public
Report relayed from mPING of street
flooding.
0910 PM Flash Flood 1 SSE Naperville 41.76N 88.14W
08/18/2025 DuPage IL Public
1 to 2 feet of water reported on Gartner
Road with vehicles stranded. Unclear exactly
where on Garner Road this is occurring.
0640 PM Flash Flood 3 E Paw Paw 41.69N 88.93W
08/18/2025 De Kalb IL Public
Video posted to social media shows at least
a foot of flowing water over Chicago Road
east of Paw Paw.
0741 PM Flash Flood 2 S Orland Hills 41.57N 87.84W
08/18/2025 Cook IL Public
Report relayed from mPING of street
flooding.
0807 PM Flash Flood 1 SE Orland Hills 41.57N 87.83W
08/18/2025 Cook IL Public
Report relayed from mPING of street
flooding.
0809 PM Flash Flood 2 W Orland Hills 41.59N 87.88W
08/18/2025 Cook IL Public
Report relayed from mPING of street
flooding.
0815 PM Flash Flood 1 NE Tinley Park 41.59N 87.78W
08/18/2025 Cook IL Public
A few public reports of basement flooding in
Tinley Park. Relayed via social media.
Photos and videos show flooded roadways with
at least several inches of flowing water in
the vicinity. Time estimated based upon
nearby reports.
0834 PM Flash Flood 1 W Midlothian 41.63N 87.73W
08/18/2025 Cook IL Public
Report relayed from mPING of street
flooding.
1000 PM Flash Flood Thornton 41.58N 87.62W
08/18/2025 Cook IL Public
2 lanes covered in water near the quarry on
I294.
1244 AM Flash Flood 2 S Orland Hills 41.57N 87.84W
08/19/2025 Cook IL Public
Several reports from from mPING of flooded
streets.
0600 AM Flash Flood 3 WNW Orland Park 41.63N 87.90W
08/19/2025 Cook IL Law Enforcement
143rd Street closed due to flooding near
Creek Crossing Drive. Relayed via social
media.
0600 AM Flash Flood 3 WSW Orland Hills 41.58N 87.89W
08/19/2025 Cook IL Law Enforcement
Wolf Road flooded near 167th Street near
Marley Creek crossing. Relayed via social
media.
&&
$$
Meteorology
The second snow event of the season, this one also during the weekend, was a longer duration event that was truly made up of two meteorological systems. The first was a minor upper disturbance that produced lift and saturation in an inherent cold atmosphere, favorable for larger dendritic snowflake growth. The second system was about 12 hours later, with occasional flurries/light snow in-between. This second upper level disturbance was a stronger one and steered high moisture northward over the area. The snow caused by this event was a more wet snow, with snowflakes sticking together as they fell. Both "bursts" of snow activity had rates near or over one inch per hour at times north of I-80.
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| December 10, 2016: Radar loop from noon to midnight | December 11, 2016: Radar loop from midnight to noon | December 11, 2016: Radar loop from noon to midnight |
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| December 11, 2016: NWS Chicago Doppler Radar Reflectivity loop from 9 a.m. through 10 p.m. The yellow areas indicate over 30 dBZ echoes of snow that are indicative of a high number of snowflakes or large snowflakes, or both. These echoes were often in stripes correlating with snow bands. The forcing for this was a developing frontogenetic circulation in response to the deepening of the weather system and tightening of the temperature gradient aloft. |
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| December 11, 2016: NWS Chicago Doppler Radar Reflectivity image from 4:45 pm Heavy snow bands across Lake and McHenry Counties southwest through DuPage, Kane, DeKalb, and LaSalle Counties. |
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| December 11, 2016: RAP Analysis of 500 mb at 6 p.m. The colors indicate the mid-level winds and the black lines heights. The short wave trough moving across the Upper Midwest and the associated jet promoted widespread lift and deformation across northern Illinois, which favored the development of the frontogenetic circulation and snow bands. | December 11, 2016: RAP Analysis of Precipitable Water (PWAT) at 3 p.m. Moisture values in excess of 0.6 inches are high for all snow events. Similar to the prior Sunday, the snow became more wet and coupled with the light winds at the surface, it stuck to many objects such as trees. The 6 pm NWS Lincoln, IL weather balloon confirmed these values with 0.71" PWAT observed. |
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| December 10, 2016 6 p.m.: RAP model analysis in far northern Illinois | December 11, 2016 9 a.m.: RAP model analysis in far northern Illinois | December 11, 2016 6 p.m.: RAP model analysis in far northern Illinois |
Additional
Photos
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| Photo courtesy of Christian Lyon, Lakeview area of Chicago, IL | Photo courtesy of Christine McEvilly in the southwest Suburbs |
Links
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Media use of NWS Web News Stories is encouraged!
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