Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 70, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 14, 2021, 8:39 AM CDT for 7 counties in Iowa. It was in force for 66 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, 8:39 AM CDT (13:39 UTC)
- Expired
- Jul 14, 2021, 9:45 AM CDT
- In force
- 66 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Butler County, IA, Cerro Gordo County, IA, Franklin County, IA, Grundy County, IA, Hancock County, IA, Hardin County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 135 km from the middle of the area, began a volume at 13:41 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 226 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.
278
WUUS53 KDMX 141339
SVRDMX
IAC023-033-069-075-081-083-197-141445-
/O.NEW.KDMX.SV.W.0070.210714T1339Z-210714T1445Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
839 AM CDT Wed Jul 14 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Northern Hardin County in central Iowa...
Northeastern Wright County in north central Iowa...
Franklin County in north central Iowa...
Southeastern Hancock County in north central Iowa...
Northwestern Grundy County in central Iowa...
Butler County in north central Iowa...
Cerro Gordo County in north central Iowa...
* Until 945 AM CDT.
* At 838 AM CDT, severe thunderstorms were located along a line
extending from 9 miles south of Clear Lake to near Iowa Falls,
moving east at 25 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Ackley, Rockwell, Aplington and Parkersburg.
This includes Interstate 35 between mile markers 154 and 194.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4291 9303 4291 9278 4255 9255 4240 9342
4302 9376 4325 9303
TIME...MOT...LOC 1338Z 257DEG 24KT 4299 9342 4250 9322
HAIL...0.88IN
WIND...60MPH
$$
Small3 follow-up statements
860
WWUS53 KDMX 141406
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
906 AM CDT Wed Jul 14 2021
IAC081-197-141415-
/O.CAN.KDMX.SV.W.0070.000000T0000Z-210714T1445Z/
Wright IA-Hancock IA-
906 AM CDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WRIGHT AND
SOUTHEASTERN HANCOCK COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
central, north central and northeastern Iowa.
LAT...LON 4291 9303 4291 9278 4255 9255 4244 9321
4308 9345 4325 9303
TIME...MOT...LOC 1405Z 256DEG 25KT 4303 9309 4254 9290
$$
IAC023-033-069-075-083-141445-
/O.CON.KDMX.SV.W.0070.000000T0000Z-210714T1445Z/
Hardin IA-Franklin IA-Grundy IA-Butler IA-Cerro Gordo IA-
906 AM CDT Wed Jul 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR NORTHEASTERN HARDIN...FRANKLIN...NORTHWESTERN GRUNDY...BUTLER AND
CERRO GORDO COUNTIES...
At 905 AM CDT, severe thunderstorms were located along a line
extending from near Rockwell to near Aplington, moving east at 30
mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Aplington and Parkersburg.
This includes Interstate 35 between mile markers 172 and 193.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4291 9303 4291 9278 4255 9255 4244 9321
4308 9345 4325 9303
TIME...MOT...LOC 1405Z 256DEG 25KT 4303 9309 4254 9290
HAIL...0.88IN
WIND...60MPH
$$
Small227
WWUS53 KDMX 141429
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
929 AM CDT Wed Jul 14 2021
IAC069-083-141439-
/O.CAN.KDMX.SV.W.0070.000000T0000Z-210714T1445Z/
Hardin IA-Franklin IA-
929 AM CDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HARDIN AND
FRANKLIN COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
central, north central and northeastern Iowa.
LAT...LON 4325 9303 4291 9303 4291 9278 4255 9255
4249 9291 4280 9303 4290 9303 4291 9307
4315 9316
TIME...MOT...LOC 1429Z 256DEG 24KT 4305 9286 4256 9267
$$
IAC023-033-075-141445-
/O.CON.KDMX.SV.W.0070.000000T0000Z-210714T1445Z/
Grundy IA-Butler IA-Cerro Gordo IA-
929 AM CDT Wed Jul 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR NORTH CENTRAL GRUNDY...BUTLER AND SOUTHEASTERN CERRO GORDO
COUNTIES...
At 929 AM CDT, severe thunderstorms were located along a line
extending from near Rockford to near Parkersburg, moving east at 30
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Mason City, Allison, Parkersburg, Greene, Aplington, Dumont, New
Hartford, Stout, Bristow, Rock Falls, Aredale, Dougherty, Portland
and Allison Municipal Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4325 9303 4291 9303 4291 9278 4255 9255
4249 9291 4280 9303 4290 9303 4291 9307
4315 9316
TIME...MOT...LOC 1429Z 256DEG 24KT 4305 9286 4256 9267
HAIL...<.75IN
WIND...60MPH
$$
Small418
WWUS53 KDMX 141442
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
942 AM CDT Wed Jul 14 2021
IAC023-033-075-141452-
/O.EXP.KDMX.SV.W.0070.000000T0000Z-210714T1445Z/
Grundy IA-Butler IA-Cerro Gordo IA-
942 AM CDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL GRUNDY...BUTLER
AND SOUTHEASTERN CERRO GORDO COUNTIES WILL EXPIRE AT 945 AM CDT...
The storms which prompted the warning have weakened below severe
limits, or have exited the warned area. Therefore, the warning will
be allowed to expire. However gusty winds are still possible with
these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
central, north central and northeastern Iowa.
LAT...LON 4325 9303 4291 9303 4291 9278 4255 9255
4249 9291 4280 9303 4290 9303 4291 9307
4315 9316
TIME...MOT...LOC 1442Z 257DEG 24KT 4306 9278 4257 9259
$$
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, 8:43 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 62 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.