Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 68, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 7, 2021, 11:01 AM CDT for 4 counties in Wisconsin. It was in force for 59 min. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 7, 2021, 11:01 AM CDT (16:01 UTC)
- Expired
- Sep 7, 2021, 12:00 PM CDT
- In force
- 59 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Jefferson County, WI
The radar
The Milwaukee radar (KMKX), 34 km from the middle of the area, began a volume at 16:00 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 7, 11:08 AM CDT | HAIL 1 | Mcfarland, WI | TIME ESTIMATED FROM RADAR. |
| Sep 7, 11:10 AM CDT | HAIL 1 | Fitchburg, WI | |
| Sep 7, 11:22 AM CDT | HAIL 1 | Stoughton, WI | SPOTTER REPORTED QUARTER SIZE HAIL IN STOUGHTON. |
| Sep 7, 11:24 AM CDT | HAIL 1 | 2 Wsw Watertown, WI |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 4.0 hours before the alert went out and 169 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
- 14 J/kg
- Mixed-layer CIN
- -216 J/kg
- Mixed-layer LCL
- 1012 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -120 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted.
894
WUUS53 KMKX 071601
SVRMKX
WIC021-025-027-055-071700-
/O.NEW.KMKX.SV.W.0068.210907T1601Z-210907T1700Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1101 AM CDT Tue Sep 7 2021
The National Weather Service in Milwaukee/Sullivan has issued a
* Severe Thunderstorm Warning for...
Southeastern Columbia County in south central Wisconsin...
Eastern Dane County in south central Wisconsin...
Jefferson County in southeastern Wisconsin...
Southern Dodge County in southeastern Wisconsin...
* Until noon CDT.
* At 1100 AM CDT, severe thunderstorms were located along a line
extending from 6 miles north of Sun Prairie to near New Glarus,
moving east at 60 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Severe thunderstorms will be near...
Sun Prairie around 1105 AM CDT.
Columbus, Marshall and Waterloo around 1110 AM CDT.
Oregon and Brooklyn around 1115 AM CDT.
Watertown and Stoughton around 1125 AM CDT.
Edgerton around 1135 AM CDT.
Lake Koshkonong around 1140 AM CDT.
Whitewater around 1150 AM CDT.
Palmyra around 1155 AM CDT.
Other locations impacted by these severe thunderstorms include
Busseyville, Richwood, Hubbleton, Utica, Rockdale, Rome, Token Creek,
Henry Vilas Zoo, Hebron and Helenville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4286 8974 4334 8916 4332 8842 4320 8842
4320 8854 4284 8855
TIME...MOT...LOC 1600Z 272DEG 54KT 4327 8920 4285 8970
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
GEHRING2 follow-up statements
260
WWUS53 KMKX 071616 RRA
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1116 AM CDT Tue Sep 7 2021
WIC021-071626-
/O.CAN.KMKX.SV.W.0068.000000T0000Z-210907T1700Z/
Columbia WI-
1116 AM CDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN COLUMBIA COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area.Therefore, the warning has been cancelled.
LAT...LON 4286 8953 4332 8886 4332 8842 4320 8842
4320 8854 4284 8855
TIME...MOT...LOC 1616Z 272DEG 54KT 4326 8891 4284 8941
$$
WIC025-027-055-071700-
/O.CON.KMKX.SV.W.0068.000000T0000Z-210907T1700Z/
Dane WI-Jefferson WI-Dodge WI-
1116 AM CDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
SOUTHEASTERN DANE...JEFFERSON AND SOUTHERN DODGE COUNTIES...
At 1116 AM CDT, severe thunderstorms were located along a line
extending from 6 miles northeast of Waterloo to Brooklyn, moving east
at 60 mph.
HAZARD...Quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Damage to vehicles is expected.
These severe storms will be near...
Watertown and Stoughton around 1125 AM CDT.
Edgerton around 1135 AM CDT.
Lake Koshkonong around 1140 AM CDT.
Whitewater around 1150 AM CDT.
Palmyra around 1155 AM CDT.
Other locations impacted by these severe thunderstorms include
Busseyville, Ashippun, Milford, Richwood, Ixonia, Hubbleton, Utica,
Rockdale, Lebanon and Pipersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4286 8953 4332 8886 4332 8842 4320 8842
4320 8854 4284 8855
TIME...MOT...LOC 1616Z 272DEG 54KT 4326 8891 4284 8941
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
GEHRING432
WWUS53 KMKX 071658
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1158 AM CDT Tue Sep 7 2021
WIC025-027-055-071706-
/O.EXP.KMKX.SV.W.0068.000000T0000Z-210907T1700Z/
Dane WI-Jefferson WI-Dodge WI-
1158 AM CDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DANE...JEFFERSON
AND SOUTHERN DODGE COUNTIES WILL EXPIRE AT NOON CDT...
The storms which prompted the warning have moved out of much of the
area. Therefore, the warning will be allowed to expire. A seperate
Severe Thunderstorm Warning continues for far southeast Jefferson
County for large hail.
A Severe Thunderstorm Watch remains in effect until 600 PM CDT for
south central and southeastern Wisconsin.
LAT...LON 4286 8953 4332 8886 4332 8842 4320 8842
4320 8854 4284 8855
TIME...MOT...LOC 1656Z 272DEG 54KT 4324 8812 4282 8862
$$
GEHRINGThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 9:06 PM CDT | Small Craft Advisory | MKX | 45 hr | |
| Sep 7, 2:21 AM CDT | Gale Warning | MKX | 13 hr | |
| Sep 7, 8:41 AM CDT | Special Weather Statement | MKX | Marquette | 49 min |
| Sep 7, 8:57 AM CDT | Severe Thunderstorm Warning | MKX | Green Lake, Marquette | 48 min |
| Sep 7, 9:34 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac | 56 min |
| Sep 7, 10:10 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac | 50 min |
| Sep 7, 10:27 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Sheboygan | 78 min |
| Sep 7, 10:40 AM CDT | Special Weather Statement | MKX | Columbia, Dane, Dodge, Iowa | 65 min |
| Sep 7, 10:57 AM CDT | Special Marine Warning | MKX | 63 min | |
| Sep 7, 11:04 AM CDT | Severe Thunderstorm Warning | MKX | Dodge, Fond du Lac, Ozaukee, Sheboygan, Washington | 56 min |
| Sep 7, 11:11 AM CDT | Severe Thunderstorm Warning | MKX | Green, Rock | 34 min |
| Sep 7, 11:22 AM CDT | Special Marine Warning | MKX | 53 min | |
| Sep 7, 11:27 AM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Ozaukee, Washington, Waukesha | 48 min |
| Sep 7, 11:31 AM CDT | Special Marine Warning | MKX | 89 min | |
| Sep 7, 11:42 AM CDT | Severe Thunderstorm Warning | MKX | Rock, Walworth | 48 min |
| Sep 7, 11:45 AM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Milwaukee, Waukesha | 60 min |
| Sep 7, 12:18 PM CDT | Special Marine Warning | MKX | 87 min | |
| Sep 7, 12:19 PM CDT | Severe Thunderstorm Warning | MKX | Racine, Walworth | 40 min |
| Sep 7, 12:30 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine, Rock, Walworth | 60 min |
| Sep 7, 12:47 PM CDT | Special Weather Statement | MKX | Milwaukee | 28 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.