Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 1, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Mar 10, 2021, 5:18 PM CST for Clarke County, Union County, Iowa. It was in force for 24 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
- Mar 10, 2021, 5:18 PM CST (23:18 UTC)
- Expired
- Mar 10, 2021, 5:42 PM CST
- In force
- 24 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Clarke County, IA, Union County, IA
The radar
The Des Moines radar (KDMX), 84 km from the middle of the area, began a volume at 23:21 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, 11.3 hours before the alert went out and 201 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
- 178 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 794 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 293 m²/s²
- 0-3 km storm-relative helicity
- 400 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
The text
As transmitted.
174 WUUS53 KDMX 102318 SVRDMX IAC039-175-110000- /O.NEW.KDMX.SV.W.0001.210310T2318Z-210311T0000Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Des Moines IA 518 PM CST Wed Mar 10 2021 The National Weather Service in Des Moines has issued a * Severe Thunderstorm Warning for... Southeastern Union County in south central Iowa... Northwestern Clarke County in south central Iowa... * Until 600 PM CST. * At 518 PM CST, a severe thunderstorm was located near Sun Valley Lake, or 15 miles northeast of Mount Ayr, moving northeast at 60 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Murray, Thayer and Murray Roadside Rest Area. This includes Interstate 35 between mile markers 38 and 43. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4090 9419 4116 9394 4116 9367 4090 9404 TIME...MOT...LOC 2318Z 224DEG 51KT 4092 9410 HAIL...<.75IN WIND...60MPH $$ Cogil
2 follow-up statements
893
WWUS53 KDMX 102327
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
527 PM CST Wed Mar 10 2021
IAC175-102337-
/O.CAN.KDMX.SV.W.0001.000000T0000Z-210311T0000Z/
Union IA-
527 PM CST Wed Mar 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN UNION COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4108 9401 4116 9394 4116 9367 4092 9401
TIME...MOT...LOC 2327Z 226DEG 56KT 4102 9396
$$
IAC039-110000-
/O.CON.KDMX.SV.W.0001.000000T0000Z-210311T0000Z/
Clarke IA-
527 PM CST Wed Mar 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CST
FOR NORTHWESTERN CLARKE COUNTY...
At 527 PM CST, a severe thunderstorm was located 8 miles west of
Lakeside Casino, or 9 miles west of Osceola, moving northeast at 65
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Murray and Murray Roadside Rest Area.
This includes Interstate 35 between mile markers 38 and 42.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4108 9401 4116 9394 4116 9367 4092 9401
TIME...MOT...LOC 2327Z 226DEG 56KT 4102 9396
HAIL...<.75IN
WIND...60MPH
$$
Cogil072
WWUS53 KDMX 102342
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
542 PM CST Wed Mar 10 2021
IAC039-102352-
/O.CAN.KDMX.SV.W.0001.000000T0000Z-210311T0000Z/
Clarke IA-
542 PM CST Wed Mar 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CLARKE COUNTY IS
CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However, another Severe
Thunderstorm Warning is in effect for portions of Clarke County
until 615 PM CST.
LAT...LON 4108 9401 4116 9394 4116 9367 4092 9401
TIME...MOT...LOC 2340Z 224DEG 51KT 4117 9376
$$
CogilThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 10, 3:55 AM CST | Wind Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 20 hr |
| Mar 10, 4:02 AM CST | Red Flag Warning | DMX | Adair, Adams, Audubon, Cass, Guthrie, Taylor | 14 hr |
| Mar 10, 2:15 PM CST | High Wind Warning | DMX | Adair, Adams, Audubon, Carroll, Cass, Crawford and 4 more | 4 hr |
| Mar 10, 5:34 PM CST | Severe Thunderstorm Warning | DMX | Grundy, Marshall | 24 min |
| Mar 10, 5:36 PM CST | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas | 39 min |
Nearby
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.