Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 64, NWS Des Moines, IA

May 8, 20244 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 8, 2024, 7:59 PM CDT for 4 counties in Iowa. It was in force for 46 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 8, 2024, 7:59 PM CDT (00:59 UTC)
Expired: May 8, 2024, 8:45 PM CDT
In force: 46 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Grundy County, IA, Hardin County, IA, Marshall County, IA, Story County, IA

The radar

The Des Moines radar (KDMX), 73 km from the middle of the area, began a volume at 00:59 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.

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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 8, 6:41 PM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, May 8, 6:41 PM CDT, 1 hour 18 minutes before

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Hazardous weather outlook, May 8, 3:37 PM CDT, 4 hours 22 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
337 PM CDT Wed May 8 2024

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-091100-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-
Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-
Appanoose-Davis-
337 PM CDT Wed May 8 2024

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Scattered thunderstorms are forecast into tonight, mainly over the
northern half of Iowa. A few storms could produce large hail,
damaging winds, or a brief tornado. There will also be a renewed
chance for locally heavy rainfall, especially north, where
isolated amounts may reach two inches or more.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Some thunderstorm chances remain in the forecast Thursday, and
will return again early next week, but the severe weather
potential is low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed at times through tonight.

Small

In the hours before

Special weather statement, May 8, 5:32 PM CDT, 2 hours 27 minutes before

Special Weather Statement
National Weather Service Des Moines IA
532 PM CDT Wed May 8 2024

IAZ034-082315-
Calhoun IA-
532 PM CDT Wed May 8 2024

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL CALHOUN COUNTY THROUGH
615 PM CDT...

At 531 PM CDT, Doppler radar was tracking a strong thunderstorm near
Lake City, or 7 miles southwest of Rockwell City, moving northeast at
20 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail, along with
         rainfall up to one inch.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible. Ponding of water on roadways, low visibilities,
         and rises in small streams and creeks.

Locations impacted include...
Rockwell City, Lake City, North Twin Lake, South Twin Lake, Twin
Lakes, Somers, Jolley, Yetter, Twin Lakes State Park, and Rockwell
City Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4256 9463 4239 9441 4223 9482 4238 9486
TIME...MOT...LOC 2231Z 222DEG 18KT 4232 9473

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Bury

Special weather statement, May 8, 5:41 PM CDT, 2 hours 18 minutes before

Special Weather Statement
National Weather Service Des Moines IA
541 PM CDT Wed May 8 2024

IAZ046-047-058-059-082330-
Boone IA-Guthrie IA-Greene IA-Dallas IA-
541 PM CDT Wed May 8 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN GREENE...
NORTHEASTERN GUTHRIE...SOUTHWESTERN BOONE AND NORTHWESTERN DALLAS
COUNTIES THROUGH 630 PM CDT...

At 540 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Perry, moving northeast at 20 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail, along with
         rainfall up to one inch.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible. Ponding of water on roadways, low visibilities,
         and rises in small streams and creeks.

Locations impacted include...
Perry, Jefferson, Ogden, Lake Panorama, Grand Junction, Bayard,
Bagley, Rippey, Yale, Jamaica, Dawson, Dana, Beaver, Berkley, Perry
Municipal Airport, Lakin Slough Game Management Area, Jefferson
Municipal Airport, and Springbrook State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4171 9438 4186 9456 4218 9415 4195 9390
TIME...MOT...LOC 2240Z 228DEG 18KT 4186 9428

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Bury

Local storm report, May 8, 6:17 PM CDT, 1 hour 42 minutes before

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Local storm report, May 8, 6:23 PM CDT, 1 hour 36 minutes before

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Local storm report, May 8, 6:59 PM CDT, 1 hour before

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Local storm report, May 8, 7:02 PM CDT, 57 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 8, 7:10 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Polk, Story	50 min
May 8, 7:36 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Hardin, Story	54 min
May 8, 8:53 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Marshall, Tama	52 min
May 8, 9:20 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Calhoun, Carroll, Greene, Guthrie	40 min
May 8, 9:24 PM CDT	River Flood Warning	DMX	Cerro Gordo, Floyd, Worth	13 hr
May 8, 9:32 PM CDT	River Flood Watch	DMX	Black Hawk	14 hr
May 8, 9:32 PM CDT	River Flood Watch	DMX	Black Hawk, Bremer, Butler	13 hr
May 8, 9:32 PM CDT	River Flood Watch	DMX	Black Hawk	13 hr
May 8, 9:39 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Tama	51 min
May 8, 10:52 PM CDT	Special Weather Statement	DMX	Boone	23 min
May 8, 11:08 PM CDT	Special Weather Statement	DMX	Story	22 min
May 9, 11:00 AM CDT	River Flood Watch	DMX	Boone, Hamilton, Webster	10 hr
May 9, 11:24 AM CDT	River Flood Warning	DMX	Black Hawk	21 hr

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; radar from the NEXRAD Level II archive.