Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 86, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 20, 2021, 9:21 PM CDT for Columbia County, Dodge County, Wisconsin. It was in force for 24 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
- Sep 20, 2021, 9:21 PM CDT (02:21 UTC)
- Expired
- Sep 20, 2021, 9:45 PM CDT
- In force
- 24 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Columbia County, WI, Dodge County, WI
The radar
The Milwaukee radar (KMKX), 61 km from the middle of the area, began a volume at 02:25 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
Green Bay/Straub, WI (KGRB), launched 00:00Z, 2.4 hours before the alert went out and 141 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
- 429 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 735 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 194 m²/s²
- 0-3 km storm-relative helicity
- 212 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.0
The text
As transmitted.
442
WUUS53 KMKX 210221
SVRMKX
WIC021-027-210245-
/O.NEW.KMKX.SV.W.0086.210921T0221Z-210921T0245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
921 PM CDT Mon Sep 20 2021
The National Weather Service in Milwaukee/Sullivan has issued a
* Severe Thunderstorm Warning for...
Southeastern Columbia County in south central Wisconsin...
Northwestern Dodge County in southeastern Wisconsin...
* Until 945 PM CDT.
* At 920 PM CDT, a severe thunderstorm was located 8 miles northeast
of Deforest, or 9 miles north of Sun Prairie, moving northeast at
50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Fall River around 930 PM CDT.
Columbus around 935 PM CDT.
Beaver Dam around 945 PM CDT.
Other locations impacted by this severe thunderstorm include
Danville, Otsego, South Beaver Dam, Leipsig and Doylestown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4356 8884 4337 8875 4328 8901 4328 8932
4335 8935
TIME...MOT...LOC 0220Z 240DEG 45KT 4332 8922
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
GEHRING1 follow-up statement
888
WWUS53 KMKX 210232
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
932 PM CDT Mon Sep 20 2021
WIC021-027-210245-
/O.CON.KMKX.SV.W.0086.000000T0000Z-210921T0245Z/
Columbia WI-Dodge WI-
932 PM CDT Mon Sep 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR SOUTHEASTERN COLUMBIA AND NORTHWESTERN DODGE COUNTIES...
At 932 PM CDT, a severe thunderstorm was located over Fall River, or
near Columbus, moving northeast at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This severe storm will be near...
Beaver Dam around 945 PM CDT.
Other locations impacted by this severe thunderstorm include
Danville, Otsego, South Beaver Dam, Leipsig and Doylestown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4356 8884 4337 8875 4328 8901 4328 8920
4339 8924
TIME...MOT...LOC 0232Z 240DEG 45KT 4340 8904
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
GEHRINGThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 7:22 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Sauk | 38 min |
| Sep 20, 7:46 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Sauk | 44 min |
| Sep 20, 7:59 PM CDT | Special Weather Statement | MKX | Iowa | 31 min |
| Sep 20, 8:23 PM CDT | Special Weather Statement | MKX | Marquette | 37 min |
| Sep 20, 8:37 PM CDT | Special Weather Statement | MKX | Columbia, Sauk | 38 min |
| Sep 20, 9:14 PM CDT | Special Weather Statement | MKX | Lafayette | 46 min |
| Sep 20, 9:22 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Iowa, Lafayette | 38 min |
| Sep 20, 9:24 PM CDT | Tornado Warning | MKX | Dane, Green, Iowa, Lafayette | 24 min |
| Sep 20, 9:44 PM CDT | Special Weather Statement | MKX | Green Lake | 46 min |
| Sep 20, 10:04 PM CDT | Special Weather Statement | MKX | Green | 41 min |
| Sep 20, 10:27 PM CDT | Special Weather Statement | MKX | Jefferson | 48 min |
| Sep 20, 10:41 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson | 20 min |
| Sep 21, 3:04 AM CDT | Gale Watch | MKX | 11 hr | |
| Sep 21, 1:48 PM CDT | Gale Warning | MKX | 50 hr | |
| Sep 21, 1:48 PM CDT | Small Craft Advisory | MKX | 17 hr | |
| Sep 21, 1:51 PM CDT | Beach Hazards Statement | MKX | Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan | 58 hr |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 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.