Life-threatening and locally catastrophic flash and urban flooding is expected across portions of south-central Texas through early Friday, with significant river flooding and rapid rises on small streams, arroyos, and typically dry washes expected. A significant heat wave continues for the Rockies, Northern Plains, and Great Lakes into the Mid-Atlantic, peaking in intensity through midweek. Read More >
Overview
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National Summary |
Local Summary |
Storm Reports
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| Map & List of Severe Thunderstorm Reports |
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO IL
1221 AM CST SUN DEC 12 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0915 PM TSTM WND GST 3 NNE PONTIAC 40.92N 88.62W
12/10/2021 M58 MPH LIVINGSTON IL AWOS
AWOS STATION KPNT PONTIAC AIRPORT.
0927 PM TSTM WND DMG 1 S MINOOKA 41.42N 88.27W
12/10/2021 GRUNDY IL PUBLIC
LARGE TREE DOWNED. TIME ESTIMATED.
0930 PM TSTM WND DMG GIBSON CITY 40.47N 88.38W
12/10/2021 FORD IL LAW ENFORCEMENT
ROOF PARTIALLY BLOWN OFF A RESIDENTIAL
BUILDING AND A COUPLE TREES DOWNED.
0934 PM TSTM WND DMG CHEBANSE 41.00N 87.91W
12/10/2021 KANKAKEE IL FIRE DEPT/RESCUE
TWO SEMIS BLOWN ON TO THEIR SIDES ON I-57
NEAR MILE MARKER 302. TIME ESTIMATED BASED
ON RADAR.
0935 PM TSTM WND GST 1 WSW NWS CHICAGO-ROMEO 41.60N 88.10W
12/10/2021 M54 MPH WILL IL AWOS
AWOS STATION KLOT ROMEOVILLE - LEWIS
AIRPORT.
0948 PM TSTM WND DMG DONOVAN 40.88N 87.62W
12/10/2021 IROQUOIS IL LAW ENFORCEMENT
COUPLE LARGE TREES DOWNED ON THE OUTSKIRTS
OF TOWN.
1000 PM TSTM WND GST PEOTONE 41.33N 87.79W
12/10/2021 M50 MPH WILL IL MESONET
MESONET STATION CW7762 PEOTONE.
1005 PM TORNADO 3 NNW CEDAR LAKE 41.41N 87.46W
12/10/2021 LAKE IN NWS STORM SURVEY
NWS STORM SURVEY FOUND DAMAGE CONSISTENT
WITH AN EF-0 TORNADO WITH ESTIMATED PEAK
WIND SPEEDS OF 85 MPH AND A PATH LENGTH OF
4.8 MILES FROM UNINCORPORATED CEDAR LAKE
INTO THE NORTH SIDE OF CROWN POINT.
1017 PM TSTM WND GST DEMOTTE 41.19N 87.20W
12/10/2021 M72 MPH JASPER IN TRAINED SPOTTER
1023 PM TSTM WND DMG 1 SSW OGDEN DUNES 41.61N 87.20W
12/10/2021 PORTER IN PUBLIC
TREES AND POWER LINES DOWN NEAR STAGE COACH
ROAD. TIME ESTIMATED BY RADAR.
1029 PM TSTM WND GST 4 W RENSSELAER 40.94N 87.22W
12/10/2021 M65 MPH JASPER IN MESONET
MESONET STATION IN005 2.7 W COLLEGEVILLE
(INDOT).
1035 PM TSTM WND GST 2 WNW RENSSELAER 40.95N 87.18W
12/10/2021 M69 MPH JASPER IN AWOS
AWOS STATION KRZL RENSSELAER AIRPORT.
1038 PM TSTM WND DMG WHEATFIELD 41.19N 87.05W
12/10/2021 JASPER IN LAW ENFORCEMENT
COUPLE LARGE TREES DOWNED IN THE AREA, AS
WELL AS SEVERAL DOWNED MEDIUM TO LARGE TREES
SCATTERED ABOUT THE COUNTY.
1045 PM TSTM WND GST 2 N KOUTS 41.34N 87.02W
12/10/2021 M54 MPH PORTER IN MESONET
MESONET STATION FW9001 KOUTS.
1056 PM TSTM WND GST 2 ENE REMINGTON 40.77N 87.12W
12/10/2021 M60 MPH JASPER IN MESONET
MESONET STATION IN048 1.7 E REMINGTON
(INDOT).
0335 AM NON-TSTM WND GST 2 SSW ROCHELLE 41.89N 89.08W
12/11/2021 M52 MPH OGLE IL AWOS
AWOS STATION KRPJ ROCHELLE AIRPORT.
0400 AM NON-TSTM WND GST 1 E WOODLAWN - CHICAGO 41.78N 87.57W
12/11/2021 M57 MPH COOK IL MESONET
MESONET STATION JAKI2 1 N SOUTH SHORE -
CHICAGO.
0400 AM NON-TSTM WND GST 1 E WOODLAWN - CHICAGO 41.78N 87.57W
12/11/2021 M57 MPH COOK IL MESONET
MESONET STATION JAKI2 1 N SOUTH SHORE -
CHICAGO.
0446 AM NON-TSTM WND GST ROCKFORD AIRPORT 42.20N 89.10W
12/11/2021 M54 MPH WINNEBAGO IL ASOS
ASOS STATION KRFD ROCKFORD AIRPORT.
0448 AM NON-TSTM WND GST MIDWAY AIRPORT 41.78N 87.76W
12/11/2021 M64 MPH COOK IL ASOS
ASOS STATION KMDW CHICAGO MIDWAY.
0450 AM NON-TSTM WND GST 1 SW BEACH PARK 42.42N 87.87W
12/11/2021 M54 MPH LAKE IL ASOS
ASOS STATION KUGN WAUKEGAN AIRPORT.
0450 AM NON-TSTM WND GST 5 ENE HERBERT 42.18N 88.70W
12/11/2021 M64 MPH MCHENRY IL MESONET
MESONET STATION IMC01 HERBERT 5 ENE (MCHENRY
DOT).
0450 AM NON-TSTM WND GST 1 NW ROCHELLE 41.94N 89.08W
12/11/2021 M56 MPH OGLE IL MESONET
MESONET STATION CW8255 ROCHELLE.
0452 AM NON-TSTM WND GST 2 W SUGAR GROVE 41.77N 88.48W
12/11/2021 M56 MPH KANE IL ASOS
ASOS STATION KARR SUGAR GROVE - AURORA ARPT.
0453 AM NON-TSTM WND GST MIDWAY AIRPORT 41.78N 87.76W
12/11/2021 M64 MPH COOK IL ASOS
ASOS STATION KMDW CHICAGO MIDWAY.
0500 AM NON-TSTM WND GST 2 E WAUKEGAN 42.36N 87.81W
12/11/2021 M48 MPH LMZ740 IL MESONET
MESONET STATION WHRI2 WAUKEGAN HARBOR.
0515 AM NON-TSTM WND GST 2 NW PERU 41.35N 89.15W
12/11/2021 M53 MPH LA SALLE IL AWOS
AWOS STATION KVYS PERU AIRPORT.
0515 AM NON-TSTM WND DMG WESTCHESTER 41.85N 87.89W
12/11/2021 COOK IL BROADCAST MEDIA
LARGE TREE DOWNED ON VEHICLE. TIME
ESTIMATED.
0516 AM NON-TSTM WND GST ROSEMONT 41.99N 87.87W
12/11/2021 M55 MPH COOK IL MESONET
MESONET STATION EW1098 ROSEMONT.
0516 AM NON-TSTM WND GST DUPAGE AIRPORT 41.92N 88.25W
12/11/2021 M60 MPH DUPAGE IL ASOS
ASOS STATION KDPA WEST CHICAGO - DUPAGE
ARPT.
0520 AM NON-TSTM WND GST OHARE AIRPORT 41.98N 87.90W
12/11/2021 M59 MPH COOK IL ASOS
ASOS STATION KORD CHICAGO OHARE.
0538 AM NON-TSTM WND GST 2 SE WHEELING 42.12N 87.90W
12/11/2021 M53 MPH COOK IL ASOS
ASOS STATION KPWK WHEELING - CHICAGO EXEC.
ARPT.
0602 AM NON-TSTM WND GST 1 NE MONTROSE HARBOR 41.97N 87.63W
12/11/2021 M55 MPH LMZ741 IL MESONET
MESONET STATION XMTB MONTROSE BEACH LIGHT.
0656 AM NON-TSTM WND GST KANKAKEE AIRPORT 41.07N 87.85W
12/11/2021 M51 MPH KANKAKEE IL AWOS
AWOS STATION KIKK KANKAKEE AIRPORT.
Cedar Lake to Crown Point, IN Tornado
An NWS storm survey confirmed an EF-0 tornado with estimated maximum wind speeds from unincorporated Cedar Lake to northern portions of Crown Point.
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| Tornado info and track. | Terminal Doppler Weather Radar (TDWR) 0.3° velocity data from tORD during the 9:44 -10:15 P.M. CST time window. This shows a developing circulation as the storms approach and cross the Illinois/Indiana state line. NWS warnings are also overlaid. |
Public Information Statement National Weather Service Chicago IL 607 PM CST Sat Dec 11 2021 /707 PM EST Sat Dec 11 2021/ ...NWS Damage Survey for December 10, 2021 Tornado Event... Overview... Scattered severe thunderstorms developed in the mid evening over central Illinois and then tracked quickly northeastward across eastern Illinois into northwest Indiana. Several of these cells exhibited rotation, one of them tracking from eastern Will County into western Lake County Indiana and producing a short-lived tornado from unincorporated Cedar Lake into the north side of Crown Point. .Cedar Lake to Crown Point, IN Tornado... Rating: EF-0 Estimated Peak Wind: 75-85 mph Path Length /statute/: 4.8 miles Path Width /maximum/: 100 yards Fatalities: 0 Injuries: 0 Start Date: 12/10/2021 Start Time: 10:05 PM CST Start Location: 3 NNW Cedar Lake / Lake County / IN Start Lat/Lon: 41.41 / -87.46 End Date: 12/10/2021 End Time: 10:10 PM CST End Location: 1 NNW Crown Point / Lake County / IN End Lat/Lon: 41.43 / -87.37 Survey Summary: This fast moving tornado caused primarily tree damage along its nearly five mile path, with numerous snapped tree limbs and several trees downed. One power pole was downed. In addition, scattered light to moderate roof damage occurred, with no other structural damage noted. The damage was consistent with mid to higher end EF-0 intensity. && EF Scale: The Enhanced Fujita Scale classifies tornadoes into the following categories: EF0...Weak......65 to 85 mph EF1...Weak......86 to 110 mph EF2...Strong....111 to 135 mph EF3...Strong....136 to 165 mph EF4...Violent...166 to 200 mph EF5...Violent...>200 mph NOTE: The information in this statement is preliminary and subject to change pending final review of the event and publication in NWS Storm Data. $$ Petr/Castro
Climatology
Tornadoes during the month of December in the NWS Chicago County Warning Area (CWA) are exceptionally rare. Roughly 99.6% of all tornadoes in our area occur outside the month of December, and rough math suggests December tornadoes occur about once every 20 years. Additionally, the Cedar Lake to Crown Point tornado was the first December tornado in the NWS Chicago CWA since 12/4/1973, and only the 5th officially documented tornado to occur here during the month of December.
Severe weather is also exceptionally rare during the month of December. Between 1950 and 2021, there were only 9 days during which severe weather was reported in the NWS Chicago CWA in the month of December (roughly 0.7% of all 1220 severe weather days). Regardless of the rarity of December severe weather, we are reminded that it can and does happen anytime of year.
More local severe weather climatological information can be found here.
Maximum Wind Gusts
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| Peak wind gusts on the morning of December 11. | Temperatures fell nearly 15°F in just one hour behind the cold front passage for many locations. |
Public Information Statement National Weather Service Chicago IL 630 PM CST Sat Dec 11 2021 ...Peak Wind Gusts for the Morning of 12/11/21... The following list provides observed peak non-thunderstorm wind gusts following the passage of a cold front during the morning of 12/11/21. Location Speed Time/Date Michigan City Light (Marine) 66 MPH 0830 AM 12/11 Chicago - Midway 64 MPH 0448 AM 12/11 Valparaiso Airport 62 MPH 0809 AM 12/11 West Chicago - DuPage Arpt. 60 MPH 0516 AM 12/11 Chicago - OHare 59 MPH 0520 AM 12/11 Harrison-Dever Crib (Marine) 59 MPH 0610 AM 12/11 Gary Airport 58 MPH 0845 AM 12/11 Chicago - 63rd St. Beach 57 MPH 0400 AM 12/11 Sugar Grove - Aurora Arpt. 56 MPH 1025 AM 12/11 Crown Point 55 MPH 0719 AM 12/11 Chicago - Montrose Beach 55 MPH 0602 AM 12/11 Rockford Airport 54 MPH 0446 AM 12/11 Waukegan Airport 54 MPH 0450 AM 12/11 Pontiac Airport 53 MPH 0335 AM 12/11 Wheeling-Chicago Exec. Arpt. 53 MPH 0538 AM 12/11 Peru Airport 53 MPH 0515 AM 12/11 Rochelle Airport 52 MPH 0335 AM 12/11 Rensselaer Airport 51 MPH 0635 AM 12/11 Kankakee Airport 51 MPH 0656 AM 12/11 McHenry (McHenry DOT) 49 MPH 0600 AM 12/11 DeKalb Airport 48 MPH 0455 AM 12/11 Lansing Airport 48 MPH 0715 AM 12/11 Romeoville - Lewis Airport 47 MPH 0455 AM 12/11 Midewin Prairie 47 MPH 0705 AM 12/11 Morris Airport 46 MPH 0535 AM 12/11 Observations are collected from a variety of sources with varying equipment and exposures. We thank all volunteer weather observers for their dedication. Not all data listed are considered official. $$ Kluber
Rainfall
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| 24-hour rainfall ending December 11th at 6 A.M. |
Rockford, IL has been dry much of 2021, but the 1.20" inches observed on Friday, December 10 made it the second wettest calendar day of this year, after only 2.52" on August 9th. It's rare to have such a wet December day. In fact, this was also the wettest December day for Rockford in six Decembers (2015).
Public Information Statement
National Weather Service Chicago IL
600 PM CST Sat Dec 11 2021
...Friday December 10th Rainfall Roundup...
The following are rain amounts for the previous 24-hours
as measured in the morning by NWS Cooperative Observers
and CoCoRaHS observers.
Observations are usually taken between 6 AND 8 AM.
24-hour rainfall amounts
for Saturday(12/11/21)...
Illinois Rain
Location (County): fall (inches)
Lake Villa 2WSW (Lake).......................2.67
Lake Villa 1SSW (Lake).......................2.31
Lakemoor 2NW (McHenry).......................2.31
Crystal Lake (McHenry).......................2.17
Bull Valley 2WNW (McHenry)...................2.02
Woodstock 4SW (McHenry)......................2.00
Crystal Lake 1WSW (McHenry)..................1.78
Genoa (De Kalb)..............................1.68
Waukegan (Lake)..............................1.50
Sterling 4NE (Lee)...........................1.47
Woodstock 5nw (McHenry)......................1.39
Park Forest 1NNE (Cook)......................1.32
Ottawa 2N (La Salle).........................1.32
New Lenox 3ENE (Will)........................1.32
Waukegan 2N (Lake)...........................1.31
Ashton (Lee).................................1.25
Ottawa 1NW (La Salle)........................1.25
Ottawa (La Salle)............................1.25
Flossmoor 1ESE (Cook)........................1.23
St Anne (Kankakee)...........................1.23
Rockford (Winnebago).........................1.22
Plainfield 2SSE (Will).......................1.19
Crete 3E (Will)..............................1.17
Paw Paw (Lee)................................1.15
Park Forest (Cook)...........................1.15
Morris 6ESE (Grundy).........................1.14
Channahon 2SSE (Will)........................1.14
Coal City 3N (Grundy)........................1.13
Rockford 2ENE (Winnebago)....................1.13
Mundelein (Lake).............................1.13
Hebron (McHenry).............................1.12
Mundelein 2WNW (Lake)........................1.09
Coal City 4NNW (Grundy)......................1.08
Carbon Hill 3.1N (Grundy)....................1.08
Elgin (Kane).................................1.07
Gilberts (Kane)..............................1.07
Peru 1ENE (La Salle).........................1.07
Lansing (Cook)...............................1.07
Midlothian (Cook)............................1.06
Mundelein (Lake).............................1.06
La Salle (La Salle)..........................1.06
Minooka (Grundy).............................1.05
Romeoville (Will)............................1.05
Buffalo Grove 2N (Lake)......................1.04
Emington 2SSE (Livingston)...................1.04
Joliet 3WNW (Will)...........................1.04
Joliet 2n (Will).............................1.04
Hoffman Estates 5W (Cook)....................1.03
Peotone (Will)...............................1.03
Bourbonnais (Kankakee).......................1.01
Lake Bluff 1W (Lake).........................1.01
Lake Zurich (Lake)...........................1.01
Chatsworth (Livingston)......................1.00
Ravenswood Manor (Cook)......................1.00
Lake Zurich 1N (Lake)........................1.00
Countryside 1ENE (Cook)......................0.99
Plainfield 5SW (Kendall).....................0.99
Manhattan 1ESE (Will)........................0.98
Schaumburg 2E (Cook).........................0.97
Chicago 6ESE (Cook)..........................0.97
St. Charles 6NW (Kane).......................0.97
Winnetka 1ESE (Cook).........................0.96
Lincolnwood 3E (Cook)........................0.96
Burr Ridge 2SW (Du Page).....................0.96
Elgin 2W (Kane)..............................0.96
Mokena 1W (Will).............................0.96
Barrington (Lake)............................0.95
Elgin (Kane).................................0.95
Elgin 1S (Kane)..............................0.95
Riverwoods (Lake)............................0.95
Capron (Boone)...............................0.94
Hoffman Estates 2SE (Cook)...................0.94
Palatine 1NNE (Cook).........................0.94
Naperville 2SE (Du Page).....................0.94
Ashkum 5.6E (Iroquois).......................0.94
St. Charles (Kane)...........................0.94
Elgin 8WSW (Kane)............................0.94
Manhattan 5ENE (Will)........................0.94
Bannockburn (Lake)...........................0.93
La Grange Park 1SSW (Cook)...................0.92
Oswego 5SSE (Kendall)........................0.92
New Lenox 2SE (Will).........................0.92
Lisle 1SE (Du Page)..........................0.91
New Lenox 3E (Will)..........................0.91
Palos Park 4WNW (Cook).......................0.90
Cortland (De Kalb)...........................0.90
Darien (Du Page).............................0.90
Highwood 1S (Lake)...........................0.90
Manhattan (Will).............................0.90
Streator (Livingston)........................0.90
Bridgeview 1NNW (Cook).......................0.89
Gibson 6NE (Ford)............................0.89
Morris 5NNW (Grundy).........................0.89
Wheeling (Cook)..............................0.89
Geneva 4WSW (Kane)...........................0.88
Elk Grove Village 2WSW (Cook)................0.87
Westmont (Du Page)...........................0.87
Palos Park 1SW (Cook)........................0.86
Oak Park 1NNE (Cook).........................0.86
Lincolnwood 2E (Cook)........................0.86
Bolingbrook 3NE (Du Page)....................0.86
Aurora 4SE (Du Page).........................0.86
Elmhurst (Du Page)...........................0.86
Midway Coop (Cook)...........................0.86
Aurora (Kane)................................0.85
Oak Lawn 2SE (Cook)..........................0.85
Oak Park 1SW (Cook)..........................0.85
Earlville 5NNE (De Kalb).....................0.85
Lombard 1NNW (Du Page).......................0.85
Geneva 1SSW (Kane)...........................0.85
Park Ridge 1WNW (Cook).......................0.84
Harwood Heights (Cook).......................0.84
Aurora 4SE (Du Page).........................0.84
Elmhurst 1ESE (Du Page)......................0.84
Coal City (Grundy)...........................0.84
Montgomery 1SSE (Kendall)....................0.84
Elburn (Kane)................................0.84
Homer Glen 1ENE (Will).......................0.84
Naperville 4SSW (Will).......................0.84
Ohare Airport (Cook).........................0.84
Earlville 3S (La Salle)......................0.83
Chicago Ridge (Cook).........................0.83
Elmhurst 2SE (Du Page).......................0.83
Morris 2SSE (Grundy).........................0.83
Pontiac (Livingston).........................0.83
Wheaton 2NNE (Du Page).......................0.82
Algonquin 1N (McHenry).......................0.82
Brandon Road Lock & Dam (Will)...............0.82
West Chicago (Du Page).......................0.81
North Aurora 2NE (Kane)......................0.81
Wilmington 3SE (Will)........................0.81
Morris (Grundy)..............................0.80
Batavia 2WNW (Kane)..........................0.80
Lockport 1SE (Will)..........................0.80
Midway (Cook)................................0.80
Aurora (Kane)................................0.79
Romeoville (Will)............................0.79
Beecher 3ENE (Will)..........................0.78
Peru (La Salle)..............................0.78
DeKalb (De Kalb).............................0.76
Watseka 6.9WNW (Iroquois)....................0.76
Herscher 3E (Kankakee).......................0.76
Joliet (Will)................................0.76
De Kalb 1SW (De Kalb)........................0.75
Rochelle (Ogle)..............................0.75
Sugar Grove 1NE (Kane).......................0.72
Batavia (Kane)...............................0.71
Dwight (Livingston)..........................0.71
Mendota (La Salle)...........................0.69
Cissna Park 1S (Iroquois)....................0.68
Palatine 1E (Cook)...........................0.67
Streator 1WSW (La Salle).....................0.67
Gibson 3WNW (Ford)...........................0.49
Sugar Grove 1ENE (Kane)......................0.47
Marseilles Lock and Dam (La Salle)...........0.46
Indiana Rain
Location (County): fall (inches)
De Motte 6S (Jasper).........................1.70
Wheatfield 4WSW (Jasper).....................1.59
Valparaiso 1NE (Porter)......................1.51
Valparaiso 1NNW (Porter).....................1.37
Valparaiso 2WSW (Porter).....................1.36
Valparaiso 6SSW (Porter).....................1.36
Valparaiso 4SW (Porter)......................1.31
Valparaiso 2N (Porter).......................1.27
Lakes Of The Four Seasons (Porter)...........1.26
Valparaiso 2WNW (Porter).....................1.25
Dyer 1WNW (Lake).............................1.23
Hebron 4NE (Porter)..........................1.19
Hobart 2E (Lake).............................1.11
Valparaiso (Porter)..........................1.11
Morocco (Newton).............................1.05
Schererville 1E (Lake).......................0.95
Rensselaer (Jasper)..........................0.92
Schererville 1E (Lake).......................0.91
Gary 5ENE (Lake).............................0.87
St. John (Lake)..............................0.79
De Motte 4SW (Jasper)........................0.78
Rensselaer 2SSW (Jasper).....................0.77
De Motte 1SSW (Jasper).......................0.76
Crown Point (Lake)...........................0.75
De Motte 1NNW (Jasper).......................0.75
Crown Point 1N (Lake)........................0.75
Rensselaer 10NNE (Jasper)....................0.73
Mount Ayr 2NNE (Newton)......................0.73
Chesterton 4E (Porter).......................0.70
Kentland 2SSE (Newton).......................0.69
Wheatfield 3S (Jasper).......................0.68
Chesterton 1ENE (Porter).....................0.68
Rensselaer 6SE (Jasper)......................0.66
Portage 3E (Porter)..........................0.65
Porter 1S (Porter)...........................0.62
Rensselaer 4N (Jasper).......................0.61
Remington (Jasper)...........................0.51
Additional Info
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Media use of NWS Web News Stories is encouraged! Please acknowledge the NWS as the source of any news information accessed from this site. Additional recaps can be found on the NWS Chicago Past Events Page |
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