Alert archive / Illinois / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 229, NWS Quad Cities, IA

June 22, 2024Scott County, Iowa; 4 counties in Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 22, 2024, 10:24 PM CDT for Scott County, Iowa; 4 counties in Illinois. It was in force for 51 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: Jun 22, 2024, 10:24 PM CDT (03:24 UTC)
Expired: Jun 22, 2024, 11:15 PM CDT
In force: 51 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Scott County, IA, Bureau County, IL, Henry County, IL, Rock Island County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 37 km from the middle of the area, began a volume at 03:25 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
Jun 22, 7:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.4 hours before the alert went out and 31 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1535 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1281 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 339 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 18.7

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 Jun 22, 10:08 PM CDT, 16 minutes earlier.

Area forecast discussion, Jun 22, 10:08 PM CDT, 16 minutes before

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Hazardous weather outlook, Jun 22, 9:02 AM CDT, 13 hours 22 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
902 AM CDT Sat Jun 22 2024

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-231415-
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-
902 AM CDT Sat Jun 22 2024

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...TODAY AND TONIGHT

Hot and humid conditions are expected once again today,
particularly for areas along and south of Interstate 80. Heat
index values between 95 to 100 degrees will be possible, and a
Heat Advisory has been issued for these locations.

Chances of thunderstorms will increase today, especially along a
cold front that will pass through the area late this afternoon
through the evening hours. Strong to severe storms are possible,
with damaging winds and tornadoes being the main threats. Initial
storms will develop along Highway 20 during the mid afternoon as a
disconnected line of supercell thunderstorms, growing upscale into
a line as it approaches the Quad Cities early this evening. The
entire outlook area remains in a Slight Risk, or level 2 of 5, for
severe weather today. Additionally, heavy rainfall from these
storms could produce localized flash flooding, especially for
urban and poorly drained areas.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Thunderstorm chances return for Tuesday and Tuesday night.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed late this afternoon through the
evening hours.

GENERAL STORM MOTION OF THE DAY: Towards the southeast around 30
to 40 mph this afternoon and evening.

Gunkel/JTS

In the hours before

Special weather statement, Jun 22, 8:33 PM CDT, 1 hour 51 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
833 PM CDT Sat Jun 22 2024

IAZ065>068-ILZ015-230215-
Rock Island IL-Scott IA-Clinton IA-Muscatine IA-Cedar IA-
833 PM CDT Sat Jun 22 2024

...A strong thunderstorm will impact portions of east central Rock
Island, Scott, south central Clinton, northeastern Muscatine and
southeastern Cedar Counties through 915 PM CDT...

At 832 PM CDT, Doppler radar was tracking a strong thunderstorm over
Walcott, or 7 miles east of Durant, moving east at 35 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could cause minor tree limb damage and blow
         around unsecured objects.

Locations impacted include...
Davenport, Rock Island, Bettendorf, East Moline, Durant, Eldridge, Le
Claire, Hampton, Port Byron, Walcott, Blue Grass, Rapids City,
Princeton, Long Grove, Cordova, Riverdale, Donahue, McCausland,
Stockton, and Maysville.

Those attending the Quad City Airshow are in the path of this storm
and should prepare for IMMINENT DANGEROUS WEATHER CONDITIONS.

This includes the following highways...
 Interstate 74 in Iowa between mile markers 1 and 5.
 Interstate 80 in Iowa between mile markers 277 and 306.
 Interstate 80 in Illinois between mile markers 1 and 3.
 Interstate 88 between mile markers 1 and 5.
 Interstate 280 between mile markers 1 and 7.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Tornado Watch remains in effect until 1000 PM CDT for northwestern
Illinois...and east central Iowa.

A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
northwestern Illinois...and east central Iowa.

&&

LAT...LON 4148 9085 4165 9094 4182 9040 4154 9024
TIME...MOT...LOC 0132Z 260DEG 30KT 4159 9076

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

McClure

Local storm report, Jun 22, 9:23 PM CDT, 1 hour 1 minute before

Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
923 PM CDT Sat Jun 22 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0858 PM     Rain             1 W Dubuque             42.51N 90.72W
06/22/2024  M2.80 Inch       Dubuque            IA   Trained Spotter

            Rainfall in past 24 hours.

&&

GROSS

Local storm report, Jun 22, 9:27 PM CDT, 57 minutes before

Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
927 PM CDT Sat Jun 22 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0926 PM     Rain             Rickardsville           42.58N 90.88W
06/22/2024  M1.83 Inch       Dubuque            IA   Trained Spotter

            Rainfall since 6 am.

&&

GROSS

Local storm report, Jun 22, 9:50 PM CDT, 34 minutes before

Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
950 PM CDT Sat Jun 22 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0947 PM     Rain             1 NNW Mount Carroll     42.11N 89.98W
06/22/2024  M2.00 Inch       Carroll            IL   Trained Spotter

            rainfall in the last 2 hrs, still raining
            heavily.

&&

GROSS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 8:06 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque, Jackson	39 min
Jun 22, 8:33 PM CDT	Special Weather Statement	DVN	Scott	42 min
Jun 22, 9:50 PM CDT	Flash Flood Warning	DVN	Clinton	91 min
Jun 23, 12:33 PM CDT	River Flood Warning	DVN	Des Moines	35 days
Jun 23, 12:33 PM CDT	River Flood Warning	DVN	Des Moines, Lee	35 days
Jun 22, 8:37 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess, Stephenson	53 min
Jun 23, 12:40 PM CDT	River Flood Warning	DVN	Henry, Rock Island, Whiteside	6 days

Nearby

Severe Thunderstorm Warnings in Illinois, 2024 Severe Thunderstorm Warnings in Iowa, 2024 Every severe thunderstorm warning in 2024

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.