Alert archive / Illinois / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 98, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Aug 23, 2020, 7:35 PM CDT for Cook County, DuPage County, Illinois. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 23, 2020, 7:35 PM CDT (00:35 UTC)
- Expired
- Aug 23, 2020, 7:58 PM CDT
- In force
- 23 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Cook County, IL, DuPage County, IL
The radar
The Chicago radar (KLOT), 35 km from the middle of the area, began a volume at 00:35 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 23, 6:47 PM CDT, 48 minutes earlier.
Area forecast discussion, Aug 23, 6:47 PM CDT, 48 minutes before
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</html>Hazardous weather outlook, Aug 23, 2:43 PM CDT, 4 hours 52 minutes before
Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 243 PM CDT Sun Aug 23 2020 ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002- 010-011-019-241945- Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage- La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford- Northern Cook-Central Cook-Southern Cook-Northern Will- Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton- 243 PM CDT Sun Aug 23 2020 /343 PM EDT Sun Aug 23 2020/ This Hazardous Weather Outlook is for portions of North Central Illinois...Northeast Illinois and Northwest Indiana. .DAY ONE...Tonight. Weather hazards expected... Limited Thunderstorm Risk. Limited Fog Risk. DISCUSSION... Additional isolated thunderstorms are still possible this afternoon and evening with the potential for locally gusty winds and heavy rain. This activity should remain below severe limits. Coverage may be slightly higher south of I-80 but we still expect fairly low coverage. There is potential for areas of fog, some possibly dense, late tonight across mainly north central Illinois. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Monday and Tuesday... Limited Thunderstorm Risk late Monday night into Tuesday morning. Limited Excessive Heat Risk. Wednesday... Limited Excessive Heat Risk. Thursday... Limited Thunderstorm Risk. Limited Excessive Heat Risk. Friday... Limited Thunderstorm Risk. DISCUSSION: There is potential for areas of fog, some possibly dense, early Monday morning across mainly north central Illinois. Thunderstorms are expected Monday night across Wisconsin and there is a chance a few of these clip far northern Illinois later in the night and Tuesday morning. If this were to happen, a stronger storm or two is possible. Heat will build into the area this week. While highs will be solidly in the 90s in most places, the air mass is not expected to be oppressively humid. Nonetheless, ensure to practice basic heat safety. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be necessary through tonight. GENERAL STORM MOTION OF THE DAY: Moving toward the southeast at 15 mph. LMZ740>745-241945- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 243 PM CDT Sun Aug 23 2020 This Hazardous Weather Outlook is for portions of the Illinois nearshore waters of Lake Michigan and the Indiana nearshore waters of Lake Michigan. .DAY ONE...Tonight. Weather hazards expected... Limited Thunderstorm Risk. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Monday night into Tuesday morning... Limited Severe Thunderstorm Risk. Thursday and Friday... Limited Thunderstorm Risk. KJB Visit us at http://weather.gov/chicago Follow us on Facebook, Twitter, and Youtube at: www.facebook.com/nwschicago www.twitter.com/nwschicago www.youtube.com/nwschicago
In the hours before
Special weather statement, Aug 23, 5:46 PM CDT, 1 hour 49 minutes before
Special Weather Statement National Weather Service Chicago/Romeoville 546 PM CDT Sun Aug 23 2020 INZ001-010-232330- Newton IN-Lake IN- 546 PM CDT Sun Aug 23 2020 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN NEWTON AND SOUTHEASTERN LAKE COUNTIES UNTIL 630 PM CDT... At 546 PM CDT, Doppler radar was tracking a strong thunderstorm over Lake Village, moving east at 10 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Lake Village, Roselawn, Shelby, Sumava Resorts and Thayer. Including the following interstate... Indiana I-65 between mile markers 233 and 237. LAT...LON 4105 8740 4115 8746 4127 8728 4105 8728 TIME...MOT...LOC 2246Z 258DEG 10KT 4111 8740 Carlaw
Local storm report, Aug 23, 6:09 PM CDT, 1 hour 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
609 PM CDT SUN AUG 23 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0430 PM HAIL 1 E PALATINE 42.11N 88.02W
08/23/2020 M1.00 INCH COOK IL COCORAHS
&&
CLocal storm report, Aug 23, 6:19 PM CDT, 1 hour 16 minutes before
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</html>Local storm report, Aug 23, 7:04 PM CDT, 31 minutes before
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</html>Local storm report, Aug 23, 7:07 PM CDT, 28 minutes before
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</html>Special weather statement, Aug 23, 7:33 PM CDT, 2 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 7:33 PM CDT | Special Weather Statement | LOT | DuPage | 42 min |
| Aug 23, 7:52 PM CDT | Areal Flood Advisory | LOT | Cook | 113 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2020Every severe thunderstorm warning in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.