Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 158, NWS Des Moines, IA

June 12, 2024Franklin County, Grundy County, Hardin County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 12, 2024, 11:17 PM CDT for Franklin County, Grundy County, Hardin County, Iowa. It was in force for 43 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 12, 2024, 11:17 PM CDT (04:17 UTC)
Expired
Jun 13, 2024, 12:00 AM CDT
In force
43 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Franklin County, IA, Grundy County, IA, Hardin County, IA

The radar

The Des Moines radar (KDMX), 100 km from the middle of the area, began a volume at 04:19 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.3 hours before the alert went out and 264 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, Minneapolis, MN at 00:00Z on 2024-06-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1263 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, Minneapolis, MN at 00:00Z on 2024-06-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 279 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
1263 J/kg
Mixed-layer CIN
-161 J/kg
Mixed-layer LCL
1298 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
279 m²/s²
0-3 km storm-relative helicity
254 m²/s²
Significant tornado parameter
0.3
Supercell composite
4.4

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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 12, 6:32 PM CDT, 4 hours 45 minutes earlier.

Area forecast discussion, Jun 12, 6:32 PM CDT, 4 hours 45 minutes before
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Hazardous weather outlook, Jun 12, 3:13 PM CDT, 8 hours 4 minutes before
Hazardous Weather Outlook
National Weather Service Des Moines IA
313 PM CDT Wed Jun 12 2024

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-132015-
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-
313 PM CDT Wed Jun 12 2024

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Strong to severe storms are possible, especially over northern and
possibly central Iowa this afternoon to evening. Damaging winds
and hail are the main threats, though a tornado or two cannot be
ruled out.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Additional storms are forecast Thursday, with strong to severe
storms possible in portions of southern and eastern Iowa in the
afternoon to evening. Hail and damaging winds are the primary
threats, although a tornado or two cannot be ruled out.

Active weather is expected to continue this weekend and into
early next week with multiple chances for showers and storms.
More details regarding timing and severe potential will be better
known in the coming days.

Heat will continue to build into the weekend with heat index
values near 100 in southern Iowa Thursday, with warmtemperatures
resuming Saturday and lasting into next week. Outside of Friday,
temperatures in the upper 80s to mid 90s are generally expected.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed at various times this week and
weekend.

In the hours before

Special weather statement, Jun 12, 6:48 PM CDT, 4 hours 29 minutes before
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Special weather statement, Jun 12, 7:57 PM CDT, 3 hours 20 minutes before
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Special weather statement, Jun 12, 10:43 PM CDT, 34 minutes before
Special Weather Statement
National Weather Service Des Moines IA
1043 PM CDT Wed Jun 12 2024

IAZ025>027-037-130430-
Wright IA-Hardin IA-Franklin IA-Butler IA-
1043 PM CDT Wed Jun 12 2024

...A STRONG THUNDERSTORM WILL IMPACT NORTHERN HARDIN...SOUTHERN
FRANKLIN...EAST CENTRAL WRIGHT AND SOUTHWESTERN BUTLER COUNTIES
THROUGH 1130 PM CDT...

At 1043 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles northwest of Iowa Falls, moving southeast at 30 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Iowa Falls, Ackley, Alden, Dows, Coulter, Geneva, Rowan, Bradford,
Popejoy, Owasa, Galt, Iowa Falls Municipal Airport, and Ackley
Municipal Airport.

This includes Interstate 35 between mile markers 153 and 165.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Des Moines .

&&

LAT...LON 4256 9301 4256 9303 4253 9303 4232 9317
      4264 9361 4278 9360 4265 9294
TIME...MOT...LOC 0343Z 295DEG 26KT 4262 9337

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

REV

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 12, 7:57 PM CDTSpecial Weather StatementDMXWebster48 min
Jun 12, 8:24 PM CDTSevere Thunderstorm WarningDMXWebster39 min
Jun 12, 10:43 PM CDTSpecial Weather StatementDMXHardin47 min
Jun 13, 2:55 PM CDTSevere Thunderstorm WarningDMXAppanoose, Davis50 min
Jun 13, 3:39 PM CDTSevere Thunderstorm Warning Considerable damage threatDMXAppanoose, Davis17 min
Jun 13, 3:47 PM CDTSevere Thunderstorm Warning Considerable damage threatDMXDavis, Wapello43 min
Jun 13, 4:15 PM CDTSevere Thunderstorm WarningDMXDavis45 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.