Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 72, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 14, 2021, 8:49 AM CDT for 5 counties in Iowa. It was in force for 56 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, 8:49 AM CDT (13:49 UTC)
- Expired
- Jul 14, 2021, 9:45 AM CDT
- In force
- 56 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Grundy County, IA, Hardin County, IA, Marshall County, IA, Story County, IA, Tama County, IA
The radar
The Des Moines radar (KDMX), 100 km from the middle of the area, began a volume at 13:51 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
Davenport, (KDVN), launched 12:00Z, 1.8 hours before the alert went out and 196 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
- 573 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 1106 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted.
099
WUUS53 KDMX 141349
SVRDMX
IAC075-083-127-169-171-141445-
/O.NEW.KDMX.SV.W.0072.210714T1349Z-210714T1445Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
849 AM CDT Wed Jul 14 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Eastern Story County in central Iowa...
Marshall County in central Iowa...
Hardin County in central Iowa...
Tama County in central Iowa...
Grundy County in central Iowa...
* Until 945 AM CDT.
* At 848 AM CDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Iowa Falls to 6 miles northeast
of Baxter, moving east at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated. At 841 AM emergency management
also reported trees down on power lines in Nevada.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Eldora around 855 AM CDT.
Other locations in the path of these severe thunderstorms include
Meskwaki Casino, Toledo and Tama.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4187 9240 4186 9332 4239 9346 4256 9272
4256 9257 4240 9253 4230 9253 4230 9251
TIME...MOT...LOC 1348Z 251DEG 23KT 4245 9317 4189 9306
HAIL...<.75IN
WIND...60MPH
$$
Small2 follow-up statements
560
WWUS53 KDMX 141408
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
908 AM CDT Wed Jul 14 2021
IAC169-141417-
/O.CAN.KDMX.SV.W.0072.000000T0000Z-210714T1445Z/
Story IA-
908 AM CDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN STORY COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
central, north central and northeastern Iowa.
LAT...LON 4186 9309 4243 9326 4256 9272 4256 9257
4240 9253 4230 9253 4230 9251 4187 9240
TIME...MOT...LOC 1407Z 250DEG 24KT 4248 9298 4192 9287
$$
IAC075-083-127-171-141445-
/O.CON.KDMX.SV.W.0072.000000T0000Z-210714T1445Z/
Marshall IA-Hardin IA-Tama IA-Grundy IA-
908 AM CDT Wed Jul 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR MARSHALL...SOUTHEASTERN HARDIN...TAMA AND GRUNDY COUNTIES...
At 907 AM CDT, severe thunderstorms were scattered along a line
extending from 6 miles southeast of Ackley to 8 miles south of
Marshalltown, moving east at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Meskwaki Casino, Toledo, Tama and Dike.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4186 9309 4243 9326 4256 9272 4256 9257
4240 9253 4230 9253 4230 9251 4187 9240
TIME...MOT...LOC 1407Z 250DEG 24KT 4248 9298 4192 9287
HAIL...0.75IN
WIND...60MPH
$$
Small313
WWUS53 KDMX 141449
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
949 AM CDT Wed Jul 14 2021
IAC075-083-127-171-141458-
/O.EXP.KDMX.SV.W.0072.000000T0000Z-210714T1445Z/
Marshall IA-Hardin IA-Tama IA-Grundy IA-
949 AM CDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR MARSHALL...SOUTHEASTERN
HARDIN...TAMA AND GRUNDY COUNTIES HAS EXPIRED...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has
been allowed to expire. However gusty winds are still possible with
these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
central, north central and northeastern Iowa.
LAT...LON 4186 9309 4243 9326 4256 9272 4256 9257
4240 9253 4230 9253 4230 9251 4187 9240
TIME...MOT...LOC 1448Z 258DEG 31KT 4255 9251 4199 9240
$$
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, 8:43 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 62 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.