Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 4, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 25, 2021, 6:46 PM CDT for 4 counties in Iowa. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 25, 2021, 6:46 PM CDT (23:46 UTC)
- Expired
- May 25, 2021, 7:30 PM CDT
- In force
- 44 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Franklin County, IA, Hamilton County, IA, Hardin County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 95 km from the middle of the area, began a volume at 23:46 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
Omaha, NE (KOAX), launched 12:00Z, 11.8 hours before the alert went out and 267 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.
- Mixed-layer CAPE
- 460 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 723 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 144 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.5
The text
As transmitted.
756 WUUS53 KDMX 252346 SVRDMX IAC069-079-083-197-260030- /O.NEW.KDMX.SV.W.0004.210525T2346Z-210526T0030Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Des Moines IA 646 PM CDT Tue May 25 2021 The National Weather Service in Des Moines has issued a * Severe Thunderstorm Warning for... Northwestern Hardin County in central Iowa... Southeastern Wright County in north central Iowa... Western Franklin County in north central Iowa... Northeastern Hamilton County in central Iowa... * Until 730 PM CDT. * At 646 PM CDT, a severe thunderstorm was located over Big Wall Lake, or 11 miles south of Clarion, moving east at 35 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * This severe thunderstorm will remain over mainly rural areas of northwestern Hardin, southeastern Wright, western Franklin and northeastern Hamilton Counties, including the following locations... Rowan, Coulter, Blairsburg, Alexander, Galt, Williams, Latimer, Alden, Popejoy and Dows. This includes Interstate 35 between mile markers 146 and 169. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4246 9380 4261 9389 4288 9342 4251 9323 TIME...MOT...LOC 2346Z 250DEG 31KT 4258 9366 HAIL...1.00IN WIND...<50MPH $$ Krull
2 follow-up statements
624 WWUS53 KDMX 260007 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 707 PM CDT Tue May 25 2021 IAC069-079-083-197-260030- /O.CON.KDMX.SV.W.0004.000000T0000Z-210526T0030Z/ Hardin IA-Wright IA-Franklin IA-Hamilton IA- 707 PM CDT Tue May 25 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR NORTHWESTERN HARDIN...SOUTHEASTERN WRIGHT...SOUTHWESTERN FRANKLIN AND NORTHEASTERN HAMILTON COUNTIES... At 707 PM CDT, a severe thunderstorm was located 8 miles northwest of Iowa Falls, moving east at 40 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. Locations impacted include... Iowa Falls, Big Wall Lake, Alden, Dows, Latimer, Coulter, Popejoy and Galt. This includes Interstate 35 between mile markers 147 and 168. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4250 9368 4260 9379 4279 9338 4251 9323 TIME...MOT...LOC 0007Z 257DEG 36KT 4261 9336 HAIL...1.00IN WIND...<50MPH $$ Krull
662
WWUS53 KDMX 260026
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
726 PM CDT Tue May 25 2021
IAC069-079-083-197-260035-
/O.EXP.KDMX.SV.W.0004.000000T0000Z-210526T0030Z/
Hardin IA-Wright IA-Franklin IA-Hamilton IA-
726 PM CDT Tue May 25 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HARDIN...
SOUTHEASTERN WRIGHT...SOUTHWESTERN FRANKLIN AND NORTHEASTERN HAMILTON
COUNTIES WILL EXPIRE AT 730 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire. However heavy rain is still possible with this
thunderstorm.
LAT...LON 4250 9368 4260 9379 4279 9338 4251 9323
TIME...MOT...LOC 0025Z 250DEG 31KT 4266 9317
$$
KrullNearby
Severe Thunderstorm Warnings in Iowa, 2021Every severe thunderstorm warning in 2021
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.