Alert archive / Illinois / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 61, NWS Chicago, IL

August 22, 2001Iroquois County, Illinois; Newton County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Aug 22, 2001, 6:17 PM CDT for Iroquois County, Illinois; Newton County, Indiana. It was in force for 43 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 22, 2001, 6:17 PM CDT (23:17 UTC)
Expired: Aug 22, 2001, 7:00 PM CDT
In force: 43 min
Issued by: NWS Chicago, IL
Area: Whole counties

Counties Iroquois County, IL, Newton County, IN

The radar

The Chicago radar (KLOT), 93 km from the middle of the area, began a volume at 23:21 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 22, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 22, 2:33 PM CDT, 3 hours 44 minutes earlier.

Area forecast discussion, Aug 22, 2:33 PM CDT, 3 hours 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO IL
233 PM CDT WED AUG 22 2001

FORECAST CONCERNS FOCUS ON POPS EARLY PERIODS AS WELL AS THREAT OF
SEVERE WEATHER TONIGHT. WARM FRONT PUSHED INTO SOUTHERN WISCONSIN
AND IS NOW STATIONARY ALONG WI/IL BORDER SOUTHWEST INTO CENTRAL IA.
WINDS HAVE RECOVERED BACK TO S/SW WITH TEMPS INTO THE 80S AND
DEWPOINTS WELL INTO THE 70S. ONLY BOUNDARY DETECTED LIES ACROSS
SOUTHERN FA BUT OTHERS LIKELY ABOUT AFTER MORNING CONVECTION.

DIFFERENCES SHOWING UP IN THE MODELS THIS RUN. AT 18Z...AVN SEEMS TO
HAVE BEST HANDLE ON SURFACE WINDS/LOCATION OF FRONT AS WELL AS
POSITION OF LOW ACROSS NE IA. AVN ALSO DID A BETTER JOB WITH
LOCATION OF CONVECTION THIS MORNING OVER SOUTHERN WI AND SOUTHWEST
MI. BY 00Z ETA LOOKS TOO FAR SOUTH WITH FRONT AND QPF. AVN FARTHER
NORTH AND LOOKS OVERALL BETTER WITH INSTABILITY. WILL TREND TOWARD
THE AVN AND NOW WITH SVR WX BOX OUT WILL GO CAT ENTIRE FA. WILL END
POPS LATE TONIGHT NORTHERN AREA AND CONTINUE POPS ALL NIGHT WITH
HEAVY RAIN MENTIONED ACROSS SOUTHERN FA. WILL ALSO KEEP LOW CHANCE
POP FOR ANY LEFT OVER RAIN SOUTHERN FA.

HIGH PRESSURE BUILDS IN ON THURS FROM UPPER LAKES AND WILL DRY
THINGS OUT UNTIL SAT WHEN NEXT SYSTEM APPROACHES. WILL REMOVE POPS
FROM FRI...KEEP FOR SAT AND INTRODUCE ON SUN. WILL STAY CLOSE TO
GUIDANCE EARLY PERIODS AND TREND WARMER TOWARD MAV LATER PERIODS.

.CHI...NONE.

CMS

In the hours before

Local storm report, Aug 22, 5:28 PM CDT, 49 minutes before

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Local storm report, Aug 22, 6:05 PM CDT, 12 minutes before

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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 5:08 PM CDT	Severe Thunderstorm Warning	LOT	Boone, McHenry	37 min
Aug 22, 5:51 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Kane	39 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2001 Severe Thunderstorm Warnings in Indiana, 2001 Every severe thunderstorm warning in 2001

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.