Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 84, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 10, 2021, 12:50 PM CDT for Clarke County, Iowa. It was in force for 25 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
- Aug 10, 2021, 12:50 PM CDT (17:50 UTC)
- Expired
- Aug 10, 2021, 1:15 PM CDT
- In force
- 25 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Clarke County, IA
The radar
The Des Moines radar (KDMX), 77 km from the middle of the area, began a volume at 17:51 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, 5.8 hours before the alert went out and 209 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
- 962 J/kg
- Mixed-layer CIN
- -346 J/kg
- Mixed-layer LCL
- 1688 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -123 m²/s²
- 0-3 km storm-relative helicity
- -41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted.
074
WUUS53 KDMX 101750
SVRDMX
IAC039-101815-
/O.NEW.KDMX.SV.W.0084.210810T1750Z-210810T1815Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1250 PM CDT Tue Aug 10 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Northwestern Clarke County in south central Iowa...
* Until 115 PM CDT.
* At 1249 PM CDT, a severe thunderstorm was located 8 miles west of
Lakeside Casino, or 9 miles west of Osceola, moving northeast at
30 mph. Trained spotters reported dime to quarter sized hail
with this storm in Murray.
HAZARD...Quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Damage to vehicles is expected.
* This severe thunderstorm will be near...
Lakeside Casino around 105 PM CDT.
Other locations in the path of this severe thunderstorm include
Osceola.
This includes Interstate 35 between mile markers 31 and 43.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4100 9402 4106 9401 4116 9382 4116 9377
4101 9367 4095 9398
TIME...MOT...LOC 1749Z 243DEG 24KT 4104 9395
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
Hagenhoff2 follow-up statements
712 WWUS53 KDMX 101805 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 105 PM CDT Tue Aug 10 2021 IAC039-101815- /O.CON.KDMX.SV.W.0084.000000T0000Z-210810T1815Z/ Clarke IA- 105 PM CDT Tue Aug 10 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM CDT FOR CENTRAL CLARKE COUNTY... At 102 PM CDT, a severe thunderstorm was located near Lakeside Casino, or near Osceola, moving northeast at 30 mph. HAZARD...Quarter size hail. SOURCE...Trained weather spotters. IMPACT...Damage to vehicles is expected. This severe storm will be near... Lakeside Casino around 105 PM CDT. Osceola around 110 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4099 9385 4107 9392 4116 9377 4101 9367 TIME...MOT...LOC 1802Z 243DEG 24KT 4108 9385 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ Hagenhoff
505
WWUS53 KDMX 101814
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
114 PM CDT Tue Aug 10 2021
IAC039-101824-
/O.EXP.KDMX.SV.W.0084.000000T0000Z-210810T1815Z/
Clarke IA-
114 PM CDT Tue Aug 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CLARKE COUNTY WILL
EXPIRE AT 115 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
LAT...LON 4099 9385 4107 9392 4116 9377 4101 9367
TIME...MOT...LOC 1814Z 243DEG 24KT 4111 9377
$$
HagenhoffThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 12:56 PM CDT | Heat Advisory | DMX | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 18 more | 30 hr |
| Aug 10, 1:48 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler | 42 min |
| Aug 10, 2:14 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 46 min |
| Aug 10, 2:57 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 18 min |
| Aug 10, 3:00 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Poweshiek, Tama | 60 min |
| Aug 10, 3:59 PM CDT | Special Weather Statement | DMX | Tama | 46 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.