Alert archive / Illinois / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 189, NWS Quad Cities, IA

July 14, 2023Henry County, Mercer County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 14, 2023, 6:30 PM CDT for Henry County, Mercer County, Illinois. It was in force for 34 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
Jul 14, 2023, 6:30 PM CDT (23:30 UTC)
Expired
Jul 14, 2023, 7:04 PM CDT
In force
34 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Henry County, IL, Mercer County, IL

The radar

The Quad Cities radar (KDVN), 39 km from the middle of the area, began a volume at 23:29 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.

IssuedProductOfficeLasted
Jul 14, 3:52 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.5 hours before the alert went out and 199 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, Lincoln, IL at 12:00Z on 2023-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 354 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2023-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 square meters per square second.19395878Sfc1 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
354 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
1297 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.9

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 Jul 14, 2:47 PM CDT, 3 hours 43 minutes earlier.

Area forecast discussion, Jul 14, 2:47 PM CDT, 3 hours 43 minutes before
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Hazardous weather outlook, Jul 14, 7:54 AM CDT, 10 hours 36 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
754 AM CDT Fri Jul 14 2023

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-151300-
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-
754 AM CDT Fri Jul 14 2023

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

Thunderstorms are expected especially this afternoon and tonight.
The Storm Prediction Center has a slight risk of severe storms
across most of the area. The primary severe risk is damaging winds
with large hail as a secondary risk. Heavy rain and frequent
lightning can be expected with any storm.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

Daily chances for showers and thunderstorms exist through the
period. There is a chance for strong to isolated severe storms
each day.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

In the hours before

Special weather statement, Jul 14, 5:30 PM CDT, 1 hour before
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Special weather statement, Jul 14, 5:32 PM CDT, 58 minutes before
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Local storm report, Jul 14, 5:38 PM CDT, 52 minutes before
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Special weather statement, Jul 14, 6:00 PM CDT, 30 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
600 PM CDT Fri Jul 14 2023

IAZ068-ILZ009-015>017-024-142345-
Mercer IL-Whiteside IL-Rock Island IL-Bureau IL-Henry IL-Scott IA-
600 PM CDT Fri Jul 14 2023

...Strong thunderstorms will impact portions of eastern Mercer,
southern Whiteside, Rock Island, northwestern Bureau, Henry and
southeastern Scott Counties through 645 PM CDT...

At 559 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Princeton to Aledo. Movement was east at
35 mph.

HAZARD...Winds up to 45 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Strong thunderstorms will be near...
  Bettendorf, East Moline, Le Claire, Hampton and Princeton around
  605 PM CDT.
  Port Byron, Rapids City and Cordova around 610 PM CDT.
  Boden around 615 PM CDT.

Other locations in the path of these storms include Cable, North
Henderson, New Windsor, Erie, New Windsor, Alpha, Prophetstown and
Woodhull.

This includes the following highways...
 Interstate 74 in Iowa between mile markers 1 and 5.
 Interstate 80 in Iowa between mile markers 297 and 306.
 Interstate 80 in Illinois between mile markers 1 and 33.
 Interstate 74 in Illinois between mile markers 1 and 33.
 Interstate 88 between mile markers 1 and 16.
 Interstate 280 between mile markers 10 and 18.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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

&&

LAT...LON 4115 9008 4115 9044 4109 9044 4113 9091
      4168 9049 4169 8970
TIME...MOT...LOC 2259Z 271DEG 31KT 4165 9042 4119 9076

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

08
Special weather statement, Jul 14, 6:06 PM CDT, 24 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
606 PM CDT Fri Jul 14 2023

IAZ054-066-068-ILZ007-009-015-142345-
Whiteside IL-Carroll IL-Rock Island IL-Scott IA-Clinton IA-
Jackson IA-
606 PM CDT Fri Jul 14 2023

...Strong thunderstorms will impact portions of Whiteside, Carroll,
northeastern Rock Island, northeastern Scott, eastern Clinton and
southeastern Jackson Counties through 645 PM CDT...

At 603 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Savanna to Albany. Movement was southeast at 30
mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Strong thunderstorms will be near...
  Garden Plain and East Clinton around 610 PM CDT.
  Mount Carroll around 615 PM CDT.
  Argo Fay around 620 PM CDT.

Other locations in the path of these storms include Lanark,
Fairhaven, Chadwick, Lyndon, Milledgeville and Coleta.

This includes Interstate 88 between mile markers 20 and 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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

&&

LAT...LON 4170 8970 4169 9048 4218 9027 4212 8969
      4193 8969 4193 8968
TIME...MOT...LOC 2303Z 300DEG 27KT 4211 9013 4177 9022

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

DC
Special weather statement, Jul 14, 6:12 PM CDT, 18 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
612 PM CDT Fri Jul 14 2023

IAZ089-099-ILZ024>026-150030-
Warren IL-Mercer IL-Henderson IL-Des Moines IA-Lee IA-
612 PM CDT Fri Jul 14 2023

...Strong thunderstorms will impact portions of Warren, southeastern
Mercer, Henderson, central Des Moines and northeastern Lee Counties
through 730 PM CDT...

At 611 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Seaton to Denmark. Movement was east at 35
mph.

HAZARD...Winds up to 35 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Strong thunderstorms will be near...
  Seaton around 615 PM CDT.
  Little York around 620 PM CDT.
  West Burlington around 625 PM CDT.
  Burlington and Lake Warren around 630 PM CDT.

Other locations in the path of these storms include Carman, Gulf
Port, North Henderson, Stronghurst, Biggsville and Raritan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
northwestern and west central Illinois...and southeastern Iowa.

&&

LAT...LON 4070 9146 4111 9083 4110 9044 4072 9044
      4065 9050
TIME...MOT...LOC 2311Z 271DEG 32KT 4107 9084 4075 9133

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH

08

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 7:36 PM CDTSpecial Weather StatementDVNMuscatine39 min
Jul 13, 10:44 PM CDTSevere Thunderstorm WarningDVNBuchanan46 min
Jul 14, 2:53 PM CDTSpecial Weather StatementDVNDelaware67 min
Jul 14, 2:58 PM CDTSpecial Weather StatementDVNBuchanan62 min
Jul 14, 3:15 PM CDTSevere Thunderstorm WarningDVNBuchanan, Delaware, Jones, Linn45 min
Jul 14, 3:25 PM CDTSevere Thunderstorm WarningDVNDelaware, Dubuque, Jackson, Jones50 min
Jul 14, 4:12 PM CDTSevere Thunderstorm WarningDVNDubuque, Jackson, Jones48 min
Jul 14, 4:32 PM CDTSevere Thunderstorm WarningDVNClinton, Jackson, Jones58 min
Jul 14, 4:40 PM CDTSpecial Weather StatementDVNMuscatine80 min
Jul 14, 4:44 PM CDTSpecial Weather StatementDVNDelaware46 min
Jul 14, 5:11 PM CDTSpecial Weather StatementDVNDes Moines49 min
Jul 14, 5:30 PM CDTSpecial Weather StatementDVNScott45 min
Jul 14, 5:32 PM CDTSpecial Weather StatementDVNClinton, Jackson43 min
Jul 14, 6:22 PM CDTSevere Thunderstorm WarningDVNDes Moines38 min
Jul 13, 8:01 PM CDTSpecial Weather StatementDVNWhiteside44 min
Jul 13, 8:34 PM CDTSpecial Weather StatementDVNBureau26 min
Jul 13, 8:54 PM CDTSpecial Weather StatementDVNBureau36 min
Jul 13, 8:58 PM CDTSevere Thunderstorm WarningDVNBureau47 min
Jul 14, 6:00 PM CDTSpecial Weather StatementDVNHenry, Mercer, Rock Island45 min
Jul 14, 6:06 PM CDTSpecial Weather StatementDVNCarroll, Whiteside39 min
Jul 14, 6:12 PM CDTSpecial Weather StatementDVNHenderson, Warren78 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2023Every severe thunderstorm warning in 2023

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.