Alert archive / Illinois / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 145, NWS Quad Cities, IA

May 4, 20264 counties in Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at May 4, 2026, 8:22 PM CDT for 4 counties in Illinois. It was in force for 54 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
May 4, 2026, 8:22 PM CDT (01:22 UTC)
Expired
May 4, 2026, 9:16 PM CDT
In force
54 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Hancock County, IL, Henderson County, IL, McDonough County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 111 km from the middle of the area, began a volume at 01:24 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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.4 hours before the alert went out and 114 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2026-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2026-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2740 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 4, 6:53 PM CDT, 1 hour 29 minutes earlier.

Area forecast discussion, May 4, 6:53 PM CDT, 1 hour 29 minutes before
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Hazardous weather outlook, May 4, 2:39 PM CDT, 5 hours 43 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
239 PM CDT Mon May 4 2026

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-051945-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
239 PM CDT Mon May 4 2026

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...THIS AFTERNOON AND TONIGHT

Winds gusting up to 35 mph combined with warm temperatures and
low humidity levels will create an elevated fire risk today for
some. Avoid or delay any outdoor burning.

The Storm Prediction Center has a marginal, level 1 out of 5, risk
for severe storms this afternoon and evening for much of the
area. Our far south was upgraded to a slight, level 2 out of 5,
risk for severe weather. The overall time frame for strong to
severe storms is 4 to 10 PM this afternoon and evening.

Low level moisture is limited so storm initiation may not occur until
4 to 6 PM. Once storms develop, hail and damaging winds will be
the primary risks.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible late this afternoon and evening.

In the hours before

Special weather statement, May 4, 4:46 PM CDT, 3 hours 36 minutes before
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Special weather statement, May 4, 4:56 PM CDT, 3 hours 26 minutes before
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Special weather statement, May 4, 5:17 PM CDT, 3 hours 5 minutes before
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Special weather statement, May 4, 6:22 PM CDT, 2 hours before
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Local storm report, May 4, 6:23 PM CDT, 1 hour 59 minutes before
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Local storm report, May 4, 6:38 PM CDT, 1 hour 44 minutes before
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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 4, 7:10 PM CDTSpecial Weather StatementDVNLee, Van Buren65 min
May 4, 7:36 PM CDTSevere Thunderstorm WarningDVNDes Moines, Lee54 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2026Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.