Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 98, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 26, 2021, 8:18 AM CDT for 5 counties in Iowa. It was in force for 42 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 26, 2021, 8:18 AM CDT (13:18 UTC)
- Expired
- Aug 26, 2021, 9:00 AM CDT
- In force
- 42 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Calhoun County, IA, Carroll County, IA, Crawford County, IA, Greene County, IA, Sac County, IA
The radar
The Des Moines radar (KDMX), 103 km from the middle of the area, began a volume at 13:18 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, 1.3 hours before the alert went out and 176 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
- 2002 J/kg
- Mixed-layer CIN
- -261 J/kg
- Mixed-layer LCL
- 1111 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 217 m²/s²
- 0-3 km storm-relative helicity
- 264 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
319
WUUS53 KDMX 261318
SVRDMX
IAC025-027-047-073-161-261400-
/O.NEW.KDMX.SV.W.0098.210826T1318Z-210826T1400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
818 AM CDT Thu Aug 26 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Western Greene County in west central Iowa...
Eastern Sac County in west central Iowa...
Calhoun County in west central Iowa...
Northeastern Crawford County in west central Iowa...
Northern Carroll County in west central Iowa...
* Until 900 AM CDT.
* At 818 AM CDT, severe thunderstorms were located along a line
extending from near Sac City to 8 miles west of Lake City to near
Carroll, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Lake City around 830 AM CDT.
Glidden, South Twin Lake and North Twin Lake around 835 AM CDT.
Other locations in the path of these severe thunderstorms include
Rockwell City and Jefferson.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4228 9518 4252 9516 4255 9444 4247 9444
4247 9442 4231 9440 4221 9440 4221 9438
4193 9441 4208 9530
TIME...MOT...LOC 1318Z 282DEG 34KT 4240 9490 4223 9488 4208 9496
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Fowle2 follow-up statements
919
WWUS53 KDMX 261331
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
831 AM CDT Thu Aug 26 2021
IAC025-027-047-073-161-261400-
/O.CON.KDMX.SV.W.0098.000000T0000Z-210826T1400Z/
Greene IA-Sac IA-Calhoun IA-Crawford IA-Carroll IA-
831 AM CDT Thu Aug 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM CDT
FOR WESTERN GREENE...EASTERN SAC...CALHOUN...EASTERN CRAWFORD AND
NORTHERN CARROLL COUNTIES...
At 831 AM CDT, severe thunderstorms were located along a line
extending from 6 miles northwest of North Twin Lake to near Lake City
to near Carroll, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Rockwell City, North Twin Lake, South Twin Lake, Manson and
Jefferson.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4228 9503 4253 9504 4255 9444 4247 9444
4247 9442 4231 9440 4221 9440 4221 9438
4193 9441 4205 9513
TIME...MOT...LOC 1331Z 278DEG 38KT 4252 9475 4222 9470 4203 9481
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Fowle848
WWUS53 KDMX 261346
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
846 AM CDT Thu Aug 26 2021
IAC047-161-261356-
/O.CAN.KDMX.SV.W.0098.000000T0000Z-210826T1400Z/
Sac IA-Crawford IA-
846 AM CDT Thu Aug 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SAC AND EASTERN
CRAWFORD COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4224 9482 4254 9481 4255 9444 4247 9444
4247 9442 4231 9440 4221 9440 4221 9438
4193 9441 4202 9492
TIME...MOT...LOC 1346Z 276DEG 38KT 4247 9452 4222 9451 4202 9465
$$
IAC025-027-073-261400-
/O.CON.KDMX.SV.W.0098.000000T0000Z-210826T1400Z/
Greene IA-Calhoun IA-Carroll IA-
846 AM CDT Thu Aug 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM CDT
FOR WESTERN GREENE...CALHOUN AND NORTHEASTERN CARROLL COUNTIES...
At 846 AM CDT, severe thunderstorms were located along a line
extending from near Manson to 11 miles east of Lake City to near
Glidden, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Carroll, Jefferson, Rockwell City, Lake City, Manson, Glidden, North
Twin Lake, South Twin Lake, Pomeroy, Scranton, Churdan, Farnhamville,
Lohrville, Twin Lakes, Lidderdale, Lanesboro, Somers, Ralston,
Knierim and Rinard.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4224 9482 4254 9481 4255 9444 4247 9444
4247 9442 4231 9440 4221 9440 4221 9438
4193 9441 4202 9492
TIME...MOT...LOC 1346Z 276DEG 38KT 4247 9452 4222 9451 4202 9465
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
FowleThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 3:30 AM CDT | Heat Advisory | DMX | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 16 more | 17 hr |
| Aug 26, 8:03 AM CDT | Special Weather Statement | DMX | Audubon, Calhoun, Carroll, Pocahontas, Sac | 42 min |
| Aug 26, 8:55 AM CDT | Special Weather Statement | DMX | Adair, Audubon, Dallas, Guthrie | 65 min |
| Aug 26, 9:18 AM CDT | Special Weather Statement | DMX | Boone, Hamilton, Webster | 57 min |
| Aug 26, 10:02 AM CDT | Special Weather Statement | DMX | Dallas, Jasper, Madison, Polk, Warren | 43 min |
| Aug 26, 12:29 PM CDT | Special Weather Statement | DMX | Boone, Story | 46 min |
| Aug 26, 1:46 PM CDT | Special Weather Statement | DMX | Davis, Wapello | 44 min |
| Aug 26, 2:16 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Wapello | 44 min |
| Aug 26, 3:03 PM CDT | Flood Watch | DMX | Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Emmet and 13 more | 16 hr |
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.