Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 152, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Aug 25, 2021, 1:58 AM CDT for Mills County, Montgomery County, Pottawattamie County, Iowa. It was in force for 32 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 25, 2021, 1:58 AM CDT (06:58 UTC)
- Expired
- Aug 25, 2021, 2:30 AM CDT
- In force
- 32 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Mills County, IA, Montgomery County, IA, Pottawattamie County, IA
The radar
The Omaha radar (KOAX), 102 km from the middle of the area, began a volume at 07:01 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, 7.0 hours before the alert went out and 102 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
- 3303 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 1689 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 8.5
The text
As transmitted.
347
WUUS53 KOAX 250658
SVROAX
IAC129-137-155-250730-
/O.NEW.KOAX.SV.W.0152.210825T0658Z-210825T0730Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
158 AM CDT Wed Aug 25 2021
The National Weather Service in Omaha has issued a
* Severe Thunderstorm Warning for...
Montgomery County in southwestern Iowa...
East central Mills County in southwestern Iowa...
Southeastern Pottawattamie County in southwestern Iowa...
* Until 230 AM CDT.
* At 157 AM CDT, a severe thunderstorm was located near Red Oak, or
29 miles west of Corning, moving northeast at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Red Oak around 205 AM CDT.
Other locations in the path of this severe thunderstorm include
Elliott.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4103 9497 4090 9526 4090 9535 4102 9545
4124 9528
TIME...MOT...LOC 0657Z 221DEG 19KT 4102 9531
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Petersen1 follow-up statement
435
WWUS53 KOAX 250726
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
226 AM CDT Wed Aug 25 2021
IAC129-137-155-250736-
/O.EXP.KOAX.SV.W.0152.000000T0000Z-210825T0730Z/
Montgomery IA-Mills IA-Pottawattamie IA-
226 AM CDT Wed Aug 25 2021
...THE SEVERE THUNDERSTORM WARNING FOR MONTGOMERY...EAST CENTRAL
MILLS AND SOUTHEASTERN POTTAWATTAMIE COUNTIES WILL EXPIRE AT 230 AM
CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 4103 9497 4090 9526 4090 9535 4102 9545
4124 9528
TIME...MOT...LOC 0726Z 221DEG 19KT 4113 9518
$$
AlbrightThe office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 12:43 AM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 47 min |
| Aug 25, 1:00 AM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 24 min |
| Aug 25, 1:16 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 44 min |
| Aug 25, 1:25 AM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Pottawattamie | 50 min |
| Aug 25, 1:53 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 37 min |
| Aug 25, 4:07 AM CDT | Heat Advisory | OAX | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more | 40 hr |
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.