Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 328, NWS Quad Cities, IA

July 30, 2024Lee County, Van Buren County, Iowa; Hancock County, Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 30, 2024, 4:30 PM CDT for Lee County, Van Buren County, Iowa; Hancock County, Illinois; Clark County, Scotland County, Missouri. It was in force for 45 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 30, 2024, 4:30 PM CDT (21:30 UTC)
Expired
Jul 30, 2024, 5:15 PM CDT
In force
45 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Lee County, IA, Van Buren County, IA, Hancock County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 152 km from the middle of the area, began a volume at 21:31 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 30, 9:30 AM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.5 hours before the alert went out and 157 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 12:00Z on 2024-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1092 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2024-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
1092 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
821 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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 30, 2:57 PM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, Jul 30, 2:57 PM CDT, 1 hour 33 minutes before
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Hazardous weather outlook, Jul 30, 3:53 PM CDT, 37 minutes before
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In the hours before

Special weather statement, Jul 30, 11:34 AM CDT, 4 hours 56 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
1134 AM CDT Tue Jul 30 2024

IAZ076>078-087>089-098-099-301715-
Henry IA-Keokuk IA-Des Moines IA-Washington IA-Van Buren IA-Lee IA-
Louisa IA-Jefferson IA-
1134 AM CDT Tue Jul 30 2024

...Strong thunderstorms will impact portions of Henry, eastern
Keokuk, northwestern Des Moines, southern Washington, northern Van
Buren, northwestern Lee, southwestern Louisa and Jefferson Counties
through 1215 PM CDT...

At 1134 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles southeast of Harper to Fairfield to 7
miles southwest of Batavia. Movement was east at 55 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...
Fairfield, Mount Pleasant, Washington, Wapello, Columbus Junction,
New London, Winfield, Wayland, Danville, Morning Sun, Brighton,
Richland, Ainsworth, Batavia, Birmingham, Columbus City, Salem,
Middletown, Libertyville, and Stockport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is occurring 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.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 400 PM CDT for
southeastern Iowa.

&&

LAT...LON 4144 9210 4122 9116 4083 9125 4069 9163
      4087 9218 4116 9218 4116 9228
TIME...MOT...LOC 1634Z 290DEG 49KT 4131 9191 4102 9196 4092 9226

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

Gunkel
Special weather statement, Jul 30, 12:15 PM CDT, 4 hours 15 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
1215 PM CDT Tue Jul 30 2024

IAZ064-067-077-078-088-089-098-099-ILZ015-024>026-034-035-301800-
Mercer IL-Warren IL-Hancock IL-Henderson IL-McDonough IL-
Rock Island IL-Henry IA-Washington IA-Lee IA-Louisa IA-Johnson IA-
Des Moines IA-Muscatine IA-Van Buren IA-
1215 PM CDT Tue Jul 30 2024

...Strong thunderstorms will impact portions of Mercer, western
Warren, northern Hancock, Henderson, northwestern McDonough,
southwestern Rock Island, Henry, southeastern Washington, Lee,
Louisa, southeastern Johnson, Des Moines, southwestern Muscatine and
east central Van Buren Counties through 100 PM CDT...

At 1214 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Conesville to near New London to near
Croton. Movement was southeast at 55 mph.

HAZARD...Winds in excess of 40 to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Burlington, Muscatine, Fort Madison, Monmouth, Mount Pleasant, Aledo,
Wapello, Columbus Junction, Oquawka, Nauvoo, West Burlington, New
London, Mediapolis, La Harpe, Winfield, Roseville, Fruitland, West
Point, Dallas City, and Danville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is occurring 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.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 400 PM CDT for
west central Illinois...and southeastern Iowa.

&&

LAT...LON 4129 9065 4073 9067 4036 9097 4071 9179
      4145 9140
TIME...MOT...LOC 1714Z 294DEG 46KT 4139 9129 4096 9129 4059 9161

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

Gunkel
Special weather statement, Jul 30, 2:34 PM CDT, 1 hour 56 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
234 PM CDT Tue Jul 30 2024

IAZ076-087-302015-
Keokuk IA-Jefferson IA-
234 PM CDT Tue Jul 30 2024

...A strong thunderstorm will impact portions of southwestern Keokuk
and northwestern Jefferson Counties through 315 PM CDT...

At 234 PM CDT, Doppler radar was tracking a strong thunderstorm near
Ottumwa Industrial Airport, or 11 miles southeast of Oskaloosa,
moving east at 25 mph.

HAZARD...Nickel size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
Hedrick, Martinsburg, Ollie, Pekin, and Linby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is occurring and may lead to localized flooding.
Do not drive your vehicle through flooded roadways. Stay away from
flooded areas. Report any flooding to local law enforcement.

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 400 PM CDT for
southeastern Iowa.

&&

LAT...LON 4127 9241 4123 9208 4108 9218 4116 9218
      4116 9241
TIME...MOT...LOC 1934Z 291DEG 21KT 4121 9245

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH

Gunkel
Local storm report, Jul 30, 3:28 PM CDT, 1 hour 2 minutes before
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Special weather statement, Jul 30, 3:34 PM CDT, 56 minutes before
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Local storm report, Jul 30, 4:26 PM CDT, 4 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 2:32 AM CDTHeat AdvisoryDVNLee, Van Buren8 hr
Jul 30, 4:37 AM CDTSevere Thunderstorm Warning Considerable damage threatDVNJefferson, Van Buren38 min
Jul 30, 4:44 AM CDTSevere Thunderstorm WarningDVNKeokuk, Washington46 min
Jul 30, 5:03 AM CDTSevere Thunderstorm WarningDVNDes Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 2 more42 min
Jul 30, 10:51 AM CDTSevere Thunderstorm WarningDVNJefferson, Keokuk39 min
Jul 30, 11:34 AM CDTSpecial Weather StatementDVNHenry, Jefferson, Keokuk, Louisa, Washington41 min
Jul 30, 12:15 PM CDTSpecial Weather StatementDVNDes Moines, Henry, Lee, Louisa45 min
Jul 30, 2:15 PM CDTFlood WatchDVNCedar, Des Moines, Henry, Iowa, Jefferson, Johnson and 7 more44 hr
Jul 30, 2:34 PM CDTSpecial Weather StatementDVNKeokuk41 min
Jul 30, 2:41 PM CDTSevere Thunderstorm WarningDVNJefferson, Keokuk, Washington49 min
Jul 30, 3:34 PM CDTSpecial Weather StatementDVNDes Moines, Henry, Jefferson41 min
Jul 30, 3:38 PM CDTSevere Thunderstorm WarningDVNHenry, Jefferson, Lee, Van Buren52 min
Jul 30, 5:41 AM CDTSevere Thunderstorm WarningDVNHancock, McDonough49 min
Jul 30, 6:07 AM CDTSevere Thunderstorm WarningDVNHenderson, McDonough, Warren53 min
Jul 30, 5:35 PM CDTSpecial Weather StatementDVNMcDonough55 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2024Severe Thunderstorm Warnings in Missouri, 2024Severe Thunderstorm Warnings in Illinois, 2024Every 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.