Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 35, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 20, 2021, 4:54 PM CDT for Bremer County, Butler County, Franklin County, Iowa. It was in force for 51 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
- Jun 20, 2021, 4:54 PM CDT (21:54 UTC)
- Expired
- Jun 20, 2021, 5:45 PM CDT
- In force
- 51 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bremer County, IA, Butler County, IA, Franklin County, IA
The radar
The Des Moines radar (KDMX), 137 km from the middle of the area, began a volume at 21:54 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 20, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.9 hours before the alert went out and 233 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2060 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
594
WUUS53 KDMX 202154
SVRDMX
IAC017-023-069-202245-
/O.NEW.KDMX.SV.W.0035.210620T2154Z-210620T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
454 PM CDT Sun Jun 20 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Western Bremer County in northeastern Iowa...
Northeastern Franklin County in north central Iowa...
Butler County in north central Iowa...
* Until 545 PM CDT.
* At 454 PM CDT, a severe thunderstorm was located 8 miles southwest
of Greene, or 9 miles northwest of Allison, moving east at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Greene around 500 PM CDT.
Allison around 505 PM CDT.
Clarksville around 510 PM CDT.
Other locations in the path of this severe thunderstorm include Shell
Rock and Waverly.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4273 9319 4291 9317 4291 9235 4264 9235
TIME...MOT...LOC 2154Z 275DEG 47KT 4283 9295
HAIL...1.00IN
WIND...60MPH
$$
REV3 follow-up statements
785
WWUS53 KDMX 202213
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
513 PM CDT Sun Jun 20 2021
IAC017-023-069-202245-
/O.CON.KDMX.SV.W.0035.000000T0000Z-210620T2245Z/
Bremer IA-Franklin IA-Butler IA-
513 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR WESTERN BREMER...EASTERN FRANKLIN AND BUTLER COUNTIES...
At 513 PM CDT, a severe thunderstorm was located near Clarksville, or
7 miles northwest of Waverly, moving east at 45 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Waverly.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4271 9303 4291 9302 4291 9235 4264 9235
TIME...MOT...LOC 2213Z 273DEG 39KT 4279 9259
HAIL...1.00IN
WIND...60MPH
$$
REV314
WWUS53 KDMX 202227
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
527 PM CDT Sun Jun 20 2021
IAC017-023-069-202245-
/O.CON.KDMX.SV.W.0035.000000T0000Z-210620T2245Z/
Bremer IA-Franklin IA-Butler IA-
527 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR WESTERN BREMER...EASTERN FRANKLIN AND BUTLER COUNTIES...
At 527 PM CDT, a severe thunderstorm was located near Waverly, moving
east at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Waverly, Allison, Clarksville, Shell Rock, Greene, Janesville,
Dumont, Plainfield, Bristow, Aredale, Allison Municipal Airport and
Waverly Municipal Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4271 9303 4291 9302 4291 9235 4264 9235
TIME...MOT...LOC 2227Z 273DEG 31KT 4278 9247
HAIL...1.00IN
WIND...60MPH
$$
REV662
WWUS53 KDMX 202239
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
539 PM CDT Sun Jun 20 2021
IAC017-023-069-202249-
/O.EXP.KDMX.SV.W.0035.000000T0000Z-210620T2245Z/
Bremer IA-Franklin IA-Butler IA-
539 PM CDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN BREMER...EASTERN
FRANKLIN AND BUTLER COUNTIES WILL EXPIRE AT 545 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
north central and northeastern Iowa.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Des Moines .
LAT...LON 4271 9303 4291 9302 4291 9235 4264 9235
TIME...MOT...LOC 2239Z 275DEG 47KT 4277 9229
$$
REVThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 3:38 PM CDT | Special Weather Statement | DMX | Dallas | 37 min |
| Jun 20, 4:20 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Union | 55 min |
| Jun 20, 4:47 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 43 min |
| Jun 20, 4:53 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Union | 52 min |
| Jun 20, 5:33 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Poweshiek | 42 min |
| Jun 20, 5:35 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Wayne | 40 min |
| Jun 20, 5:55 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marion | 50 min |
| Jun 20, 5:59 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 46 min |
| Jun 20, 6:04 PM CDT | Tornado Warning | DMX | Decatur | 26 min |
| Jun 20, 6:13 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 62 min |
| Jun 20, 6:15 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 30 min |
| Jun 20, 6:20 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 55 min |
| Jun 20, 6:37 PM CDT | Tornado Warning | DMX | Mahaska, Marion | 23 min |
| Jun 20, 6:43 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 47 min |
| Jun 20, 6:59 PM CDT | Tornado Warning | DMX | Mahaska, Marion | 31 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.