Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 100, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 26, 2021, 7:02 PM CDT for Audubon County, Carroll County, Iowa. It was in force for 28 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
- Aug 26, 2021, 7:02 PM CDT (00:02 UTC)
- Expired
- Aug 26, 2021, 7:30 PM CDT
- In force
- 28 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Audubon County, IA, Carroll County, IA
The radar
The Des Moines radar (KDMX), 106 km from the middle of the area, began a volume at 00:03 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
Omaha, NE (KOAX), launched 00:00Z, 0.0 hours before the alert went out and 127 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
- 5342 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1163 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 3.8
- Supercell composite
- 24.0
The text
As transmitted.
207
WUUS53 KDMX 270002
SVRDMX
IAC009-027-270030-
/O.NEW.KDMX.SV.W.0100.210827T0002Z-210827T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
702 PM CDT Thu Aug 26 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Northwestern Audubon County in west central Iowa...
South central Carroll County in west central Iowa...
* Until 730 PM CDT.
* At 701 PM CDT, a severe thunderstorm was located 7 miles northwest
of Audubon, moving east at 15 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...
Audubon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4186 9509 4194 9487 4170 9484 4171 9509
TIME...MOT...LOC 0001Z 252DEG 11KT 4179 9505
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Krull2 follow-up statements
295
WWUS53 KDMX 270016
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
716 PM CDT Thu Aug 26 2021
IAC009-027-270030-
/O.CON.KDMX.SV.W.0100.000000T0000Z-210827T0030Z/
Audubon IA-Carroll IA-
716 PM CDT Thu Aug 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR NORTHWESTERN AUDUBON AND SOUTH CENTRAL CARROLL COUNTIES...
At 716 PM CDT, a severe thunderstorm was located near Audubon, moving
east at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Audubon, Templeton, Gray and Audubon County Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4186 9509 4194 9487 4170 9484 4171 9509
TIME...MOT...LOC 0016Z 272DEG 16KT 4179 9499
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Krull376
WWUS53 KDMX 270026
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
726 PM CDT Thu Aug 26 2021
IAC009-027-270035-
/O.EXP.KDMX.SV.W.0100.000000T0000Z-210827T0030Z/
Audubon IA-Carroll IA-
726 PM CDT Thu Aug 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN AUDUBON AND SOUTH
CENTRAL CARROLL COUNTIES WILL EXPIRE AT 730 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 small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.
LAT...LON 4186 9509 4194 9487 4170 9484 4171 9509
TIME...MOT...LOC 0025Z 252DEG 11KT 4180 9496
$$
KrullThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 8:35 PM CDT | Special Weather Statement | DMX | Poweshiek | 40 min |
| Aug 26, 8:47 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Poweshiek | 58 min |
| Aug 26, 9:46 PM CDT | Special Weather Statement | DMX | Mahaska | 44 min |
| Aug 26, 10:26 PM CDT | Special Weather Statement | DMX | Mahaska | 34 min |
| Aug 26, 10:30 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 45 min |
| Aug 26, 10:52 PM CDT | Special Weather Statement | DMX | Wapello | 38 min |
| Aug 26, 11:42 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 33 min |
| Aug 27, 12:13 AM CDT | Special Weather Statement | DMX | Emmet | 32 min |
| Aug 27, 2:08 PM CDT | Special Weather Statement | DMX | Hancock | 37 min |
| Aug 27, 2:59 PM CDT | Special Weather Statement | DMX | Cerro Gordo | 16 min |
| Aug 27, 4:23 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock | 52 min |
| Aug 27, 4:48 PM CDT | Tornado Warning | DMX | Cerro Gordo, Hancock | 57 min |
| Aug 27, 4:58 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Franklin, Hancock | 32 min |
| Aug 27, 5:23 PM CDT | Tornado Warning | DMX | Cerro Gordo | 37 min |
| Aug 27, 5:25 PM CDT | Tornado Warning | DMX | Cerro Gordo | 35 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.