Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 66, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 9, 2021, 11:41 PM CDT for Audubon County, Cass County, Iowa. It was in force for 49 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 9, 2021, 11:41 PM CDT (04:41 UTC)
- Expired
- Jul 10, 2021, 12:30 AM CDT
- In force
- 49 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Audubon County, IA, Cass County, IA
The radar
The Omaha radar (KOAX), 107 km from the middle of the area, began a volume at 04:44 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 |
|---|---|---|---|
| Jul 9, 9:58 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.7 hours before the alert went out and 107 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
- 2603 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 1447 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 186 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 8.1
The text
As transmitted.
649
WUUS53 KDMX 100441
SVRDMX
IAC009-029-100530-
/O.NEW.KDMX.SV.W.0066.210710T0441Z-210710T0530Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1141 PM CDT Fri Jul 9 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Northwestern Cass County in southwestern Iowa...
Southwestern Audubon County in west central Iowa...
* Until 1230 AM CDT.
* At 1141 PM CDT, a severe thunderstorm was located near Walnut, or
10 miles northwest of Atlantic, moving south at 25 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...
Atlantic.
This includes Interstate 80 between mile markers 50 and 59.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4131 9515 4150 9515 4151 9504 4160 9504
4134 9485 4126 9516 4130 9516
TIME...MOT...LOC 0441Z 337DEG 21KT 4152 9513
HAIL...1.00IN
WIND...60MPH
$$
Ansorge1 follow-up statement
273
WWUS53 KDMX 100501
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
1201 AM CDT Sat Jul 10 2021
IAC009-100511-
/O.CAN.KDMX.SV.W.0066.000000T0000Z-210710T0530Z/
Audubon IA-
1201 AM CDT Sat Jul 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN AUDUBON COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
southwestern Iowa.
LAT...LON 4131 9515 4150 9515 4150 9497 4134 9485
4126 9516 4130 9516
TIME...MOT...LOC 0501Z 336DEG 27KT 4134 9503
$$
IAC029-100530-
/O.CON.KDMX.SV.W.0066.000000T0000Z-210710T0530Z/
Cass IA-
1201 AM CDT Sat Jul 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR NORTHWESTERN CASS COUNTY...
At 1201 AM CDT, a severe thunderstorm was located near Atlantic,
moving southeast at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Atlantic, Lewis, Marne, Cold Springs State Park and Atlantic
Municipal Airport.
This includes Interstate 80 between mile markers 50 and 59.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4131 9515 4150 9515 4150 9497 4134 9485
4126 9516 4130 9516
TIME...MOT...LOC 0501Z 336DEG 27KT 4134 9503
HAIL...0.75IN
WIND...60MPH
$$
AnsorgeThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 9:16 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 44 min |
| Jul 9, 9:31 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Union | 15 min |
| Jul 9, 9:38 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 52 min |
| Jul 9, 10:21 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 39 min |
| Jul 9, 11:56 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Cass | 49 min |
| Jul 10, 12:41 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Cass, Ringgold, Taylor, Union | 64 min |
| Jul 10, 2:49 PM CDT | Special Weather Statement | DMX | Carroll, Crawford, Sac | 56 min |
| Jul 10, 4:36 PM CDT | Tornado Warning | DMX | Dallas, Guthrie | 24 min |
| Jul 10, 5:00 PM CDT | Tornado Warning | DMX | Dallas | 30 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.