Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 71, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 14, 2021, 8:43 AM CDT for 4 counties in Iowa. It was in force for 62 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
- Jul 14, 2021, 8:43 AM CDT (13:43 UTC)
- Expired
- Jul 14, 2021, 9:45 AM CDT
- In force
- 62 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Cerro Gordo County, IA, Hancock County, IA, Winnebago County, IA, Worth County, IA
The radar
The Minneapolis radar (KMPX), 171 km from the middle of the area, began a volume at 13:46 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
Minneapolis, MN (KMPX), launched 12:00Z, 1.7 hours before the alert went out and 171 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
- 2820 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 1084 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted.
225
WUUS53 KDMX 141343
SVRDMX
IAC033-081-189-195-141445-
/O.NEW.KDMX.SV.W.0071.210714T1343Z-210714T1445Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
843 AM CDT Wed Jul 14 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Worth County in north central Iowa...
Northeastern Hancock County in north central Iowa...
Northern Cerro Gordo County in north central Iowa...
Winnebago County in north central Iowa...
* Until 945 AM CDT.
* At 843 AM CDT, severe thunderstorms were located along a line
extending from near Mansfield to near Clear Lake, moving northeast
at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Emmons and Mason City Municipal Airport around 855 AM CDT.
Other locations in the path of these severe thunderstorms include
Mason City and Manly.
This includes Interstate 35 between mile markers 194 and 218.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4323 9302 4300 9374 4335 9397 4337 9397
4350 9383 4350 9302
TIME...MOT...LOC 1343Z 232DEG 33KT 4353 9369 4312 9349
HAIL...<.75IN
WIND...60MPH
$$
Small3 follow-up statements
208 WWUS53 KDMX 141404 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 904 AM CDT Wed Jul 14 2021 IAC033-081-189-195-141445- /O.CON.KDMX.SV.W.0071.000000T0000Z-210714T1445Z/ Worth IA-Hancock IA-Cerro Gordo IA-Winnebago IA- 904 AM CDT Wed Jul 14 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT FOR WORTH...NORTHEASTERN HANCOCK...NORTHERN CERRO GORDO AND EASTERN WINNEBAGO COUNTIES... At 904 AM CDT, severe thunderstorms were located along a line extending from near Twin Lakes to near Mason City, moving northeast at 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe thunderstorms will remain over mainly rural areas of Worth, northeastern Hancock, northern Cerro Gordo and eastern Winnebago Counties, including the following locations... Joice, Pilot Knob State Park, Lake Mills Municipal Airport, McIntosh Woods State Park, Hogsback Wildlife Area, Plymouth, Scarville, Grafton, Fertile and Hanlontown. This includes Interstate 35 between mile markers 194 and 218. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4307 9352 4350 9369 4350 9302 4323 9302 TIME...MOT...LOC 1404Z 231DEG 33KT 4360 9346 4319 9326 HAIL...<.75IN WIND...60MPH $$ Small
772 WWUS53 KDMX 141431 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 931 AM CDT Wed Jul 14 2021 IAC081-189-141440- /O.CAN.KDMX.SV.W.0071.000000T0000Z-210714T1445Z/ Hancock IA-Winnebago IA- 931 AM CDT Wed Jul 14 2021 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HANCOCK AND EASTERN WINNEBAGO COUNTIES IS CANCELLED... The storms which prompted the warning have moved out of the warned area. Therefore, the warning has been cancelled. A Severe Thunderstorm Watch remains in effect until 300 PM CDT for north central Iowa. LAT...LON 4319 9316 4350 9321 4350 9302 4323 9302 TIME...MOT...LOC 1430Z 234DEG 32KT 4358 9313 4317 9293 $$ IAC033-195-141445- /O.CON.KDMX.SV.W.0071.000000T0000Z-210714T1445Z/ Worth IA-Cerro Gordo IA- 931 AM CDT Wed Jul 14 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT FOR EASTERN WORTH AND NORTHEASTERN CERRO GORDO COUNTIES... At 930 AM CDT, severe thunderstorms were located along a line extending from near London to near Rudd, moving northeast at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Northwood, Plymouth, Grafton, Rock Falls, Carpenter, Bolan and Northwood Municipal. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4319 9316 4350 9321 4350 9302 4323 9302 TIME...MOT...LOC 1430Z 234DEG 32KT 4358 9313 4317 9293 HAIL...<.75IN WIND...60MPH $$ Small
531
WWUS53 KDMX 141441
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
941 AM CDT Wed Jul 14 2021
IAC033-195-141451-
/O.EXP.KDMX.SV.W.0071.000000T0000Z-210714T1445Z/
Worth IA-Cerro Gordo IA-
941 AM CDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WORTH AND NORTHEASTERN
CERRO GORDO COUNTIES WILL EXPIRE AT 945 AM CDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
north central Iowa.
LAT...LON 4319 9316 4350 9321 4350 9302 4323 9302
TIME...MOT...LOC 1441Z 232DEG 33KT 4363 9305 4322 9285
$$
SmallThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 7:17 AM CDT | Special Weather Statement | DMX | Emmet, Humboldt, Kossuth, Palo Alto, Pocahontas | 58 min |
| Jul 14, 8:08 AM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Winnebago | 52 min |
| Jul 14, 8:24 AM CDT | Special Weather Statement | DMX | Butler, Cerro Gordo, Franklin, Hancock, Winnebago, Worth | 66 min |
| Jul 14, 8:39 AM CDT | Severe Thunderstorm Warning | DMX | Butler, Cerro Gordo, Franklin, Grundy, Hancock, Hardin and 1 more | 66 min |
| Jul 14, 8:49 AM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin, Marshall, Story, Tama | 56 min |
| Jul 14, 9:40 AM CDT | Special Weather Statement | DMX | Black Hawk, Bremer, Tama | 65 min |
| Jul 14, 3:55 PM CDT | Tornado Warning | DMX | Calhoun, Carroll, Greene | 35 min |
| Jul 14, 4:04 PM CDT | Tornado Warning | DMX | Boone, Hamilton, Story, Webster | 41 min |
| Jul 14, 4:23 PM CDT | Tornado Warning | DMX | Franklin, Hamilton, Hardin, Wright | 37 min |
| Jul 14, 4:29 PM CDT | Tornado Warning | DMX | Calhoun, Greene, Webster | 31 min |
| Jul 14, 4:29 PM CDT | Tornado Warning | DMX | Hamilton, Hardin | 31 min |
| Jul 14, 4:30 PM CDT | Tornado Warning | DMX | Butler | 30 min |
| Jul 14, 4:35 PM CDT | Tornado Warning | DMX | Franklin, Hardin | 40 min |
| Jul 14, 4:53 PM CDT | Tornado Warning | DMX | Bremer, Butler | 37 min |
| Jul 14, 4:56 PM CDT | Tornado Warning | DMX | Hamilton, Hardin | 25 min |
| Jul 14, 5:00 PM CDT | Tornado Warning | DMX | Hamilton, Hardin, Story | 25 min |
| Jul 14, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler | 42 min |
| Jul 14, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin | 42 min |
| Jul 14, 5:23 PM CDT | Tornado Warning | DMX | Black Hawk, Bremer, Butler | 37 min |
| Jul 14, 5:49 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy | 41 min |
| Jul 14, 5:50 PM CDT | Tornado Warning | DMX | Cerro Gordo | 25 min |
| Jul 14, 5:53 PM CDT | Tornado Warning | DMX | Black Hawk, Bremer | 37 min |
| Jul 14, 5:58 PM CDT | Tornado Warning | DMX | Calhoun | 47 min |
| Jul 14, 6:02 PM CDT | Tornado Warning | DMX | Black Hawk, Grundy, Marshall, Tama | 43 min |
| Jul 14, 6:42 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 48 min |
| Jul 14, 6:42 PM CDT | Tornado Warning | DMX | Webster | 36 min |
| Jul 14, 6:55 PM CDT | Tornado Warning | DMX | Tama | 19 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.