Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 327, NWS Quad Cities, IA

July 30, 20244 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 30, 2024, 3:38 PM CDT for 4 counties in Iowa. It was in force for 52 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, 3:38 PM CDT (20:38 UTC)
Expired: Jul 30, 2024, 4:30 PM CDT
In force: 52 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Henry County, IA, Jefferson County, IA, Lee County, IA, Van Buren County, IA

The radar

The Quad Cities radar (KDVN), 128 km from the middle of the area, began a volume at 20:37 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
Jul 30, 9:30 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.6 hours before the alert went out and 134 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: 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, 41 minutes earlier.

Area forecast discussion, Jul 30, 2:57 PM CDT, 41 minutes before

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Hazardous weather outlook, Jul 30, 11:44 AM CDT, 3 hours 54 minutes before

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In the hours before

Local storm report, Jul 30, 9:55 AM CDT, 5 hours 43 minutes before

Preliminary Local Storm Report...Summary
National Weather Service Quad Cities IA IL
955 AM CDT Tue Jul 30 2024

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

0405 AM     Tstm Wnd Dmg     2 SW Charlie Heath Memo 40.55N 91.91W
07/30/2024                   Clark              MO   Trained Spotter

            snapped a 3-4 inch tree, and relocated small
            yrd items.

0438 AM     Tstm Wnd Dmg     Sigourney               41.33N 92.21W
07/30/2024                   Keokuk             IA   Public

            Delayed report via social media. Several
            tree limbs down. Largest was 18 inches.

0454 AM     Tstm Wnd Dmg     Memphis                 40.46N 92.17W
07/30/2024                   Scotland           MO   Public

            Delayed report and time estimated from
            radar. Many tree limbs down.

0504 AM     Tstm Wnd Gst     3 ENE Charlie Heath Mem 40.59N 91.84W
07/30/2024  E50 MPH          Clark              MO   Trained Spotter

            At least 50 mph.

0505 AM     Tstm Wnd Gst     3 NW Charlie Heath Memo 40.60N 91.94W
07/30/2024  E50 MPH          Clark              MO   Trained Spotter

0523 AM     Tstm Wnd Dmg     1 S Donnellson          40.63N 91.56W
07/30/2024                   Lee                IA   CO-OP Observer

            Power lines down at the farm.

0539 AM     Tstm Wnd Dmg     1 SSW Mooar             40.44N 91.45W
07/30/2024                   Lee                IA   Trained Spotter

            Delayed report via social media and time
            estimated from radar. Tree limbs down.

0547 AM     Tstm Wnd Gst     Burlington Regional Air 40.78N 91.13W
07/30/2024  M59 MPH          Des Moines         IA   ASOS

            ASOS.

0619 AM     Tstm Wnd Gst     4 E Fandon              40.38N 90.70W
07/30/2024  M65 MPH          McDonough          IL   Trained Spotter

&&

Special weather statement, Jul 30, 11:34 AM CDT, 4 hours 4 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, 3 hours 23 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 4 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, 10 minutes before

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Special weather statement, Jul 30, 3:34 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.

Issued	Product	Office	Counties	Lasted
Jul 30, 2:32 AM CDT	Heat Advisory	DVN	Lee, Van Buren	8 hr
Jul 30, 4:37 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Jefferson, Van Buren	38 min
Jul 30, 4:44 AM CDT	Severe Thunderstorm Warning	DVN	Keokuk, Washington	46 min
Jul 30, 5:03 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 2 more	42 min
Jul 30, 10:51 AM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk	39 min
Jul 30, 11:34 AM CDT	Special Weather Statement	DVN	Henry, Jefferson, Keokuk, Louisa, Washington	41 min
Jul 30, 12:15 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Lee, Louisa	45 min
Jul 30, 2:15 PM CDT	Flood Watch	DVN	Cedar, Des Moines, Henry, Iowa, Jefferson, Johnson and 7 more	44 hr
Jul 30, 2:34 PM CDT	Special Weather Statement	DVN	Keokuk	41 min
Jul 30, 2:41 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk, Washington	49 min
Jul 30, 3:34 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Jefferson	41 min
Jul 30, 4:30 PM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	45 min
Jul 30, 5:41 AM CDT	Severe Thunderstorm Warning	DVN	Hancock, McDonough	49 min
Jul 30, 6:07 AM CDT	Severe Thunderstorm Warning	DVN	Henderson, McDonough, Warren	53 min
Jul 30, 5:35 PM CDT	Special Weather Statement	DVN	McDonough	55 min

Nearby

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.