Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 78, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 13, 2021, 1:55 AM CDT for Dane County, Jefferson County, Wisconsin. It was in force for 50 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 13, 2021, 1:55 AM CDT (06:55 UTC)
- Expired
- Sep 13, 2021, 2:45 AM CDT
- In force
- 50 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Dane County, WI, Jefferson County, WI
The radar
The Milwaukee radar (KMKX), 51 km from the middle of the area, began a volume at 06:56 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, 6.9 hours before the alert went out and 176 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1081 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
789
WUUS53 KMKX 130655
SVRMKX
WIC025-055-130745-
/O.NEW.KMKX.SV.W.0078.210913T0655Z-210913T0745Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
155 AM CDT Mon Sep 13 2021
The National Weather Service in Milwaukee/Sullivan has issued a
* Severe Thunderstorm Warning for...
Southeastern Dane County in south central Wisconsin...
Northwestern Jefferson County in southeastern Wisconsin...
* Until 245 AM CDT.
* At 155 AM CDT, a severe thunderstorm was located over southeastern
Madison, moving east at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Madison, Sun Prairie, Fitchburg, Watertown, Fort Atkinson,
Jefferson, McFarland, Monona, Lake Mills, Marshall, Waterloo,
Cottage Grove, Johnson Creek, Deerfield, Shorewood Hills,
Cambridge, Maple Bluff, Lake Ripley, Milford and Utica.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4313 8948 4320 8908 4320 8872 4294 8874
4294 8942
TIME...MOT...LOC 0655Z 259DEG 28KT 4306 8932
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
BOXELL2 follow-up statements
540
WWUS53 KMKX 130713
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
213 AM CDT Mon Sep 13 2021
WIC025-055-130745-
/O.CON.KMKX.SV.W.0078.000000T0000Z-210913T0745Z/
Dane WI-Jefferson WI-
213 AM CDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR EAST CENTRAL DANE AND NORTHWESTERN JEFFERSON COUNTIES...
At 213 AM CDT, a severe thunderstorm was located near Deerfield, or 7
miles southwest of Marshall, moving east at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Watertown, Jefferson, Lake Mills, Marshall, Waterloo, Cottage Grove,
Johnson Creek, Deerfield, Cambridge, Lake Ripley, Milford, Utica and
Rockdale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4311 8929 4317 8908 4320 8872 4294 8874
4297 8924
TIME...MOT...LOC 0713Z 260DEG 28KT 4307 8913
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
BOXELL987
WWUS53 KMKX 130734
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
234 AM CDT Mon Sep 13 2021
WIC025-130744-
/O.CAN.KMKX.SV.W.0078.000000T0000Z-210913T0745Z/
Dane WI-
234 AM CDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL DANE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
An additional Severe Thunderstorm Warning remains in effect for
western Dane County until 3 AM.
LAT...LON 4318 8897 4317 8872 4310 8873 4299 8874
4296 8901 4318 8901
TIME...MOT...LOC 0734Z 263DEG 28KT 4307 8890
$$
WIC055-130745-
/O.CON.KMKX.SV.W.0078.000000T0000Z-210913T0745Z/
Jefferson WI-
234 AM CDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR NORTHWESTERN JEFFERSON COUNTY...
At 234 AM CDT, a severe thunderstorm was located over Lake Mills,
moving east at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Jefferson, Lake Mills, Waterloo, Johnson Creek, Lake Ripley and
Milford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4318 8897 4317 8872 4310 8873 4299 8874
4296 8901 4318 8901
TIME...MOT...LOC 0734Z 263DEG 28KT 4307 8890
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
BOXELLThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 1:41 AM CDT | Special Weather Statement | MKX | Dane, Iowa | 34 min |
| Sep 13, 2:15 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Iowa | 45 min |
| Sep 13, 2:38 AM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Waukesha | 52 min |
| Sep 13, 2:45 AM CDT | Severe Thunderstorm Warning | MKX | Dane | 30 min |
| Sep 13, 3:15 AM CDT | Special Weather Statement | MKX | Jefferson | 30 min |
| Sep 13, 3:29 AM CDT | Special Weather Statement | MKX | Waukesha | 31 min |
| Sep 13, 3:34 AM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Waukesha | 41 min |
| Sep 13, 3:38 AM CDT | Special Marine Warning | MKX | 75 min | |
| Sep 13, 6:11 AM CDT | Severe Thunderstorm Warning | MKX | Iowa, Sauk | 28 min |
| Sep 13, 7:43 AM CDT | Special Weather Statement | MKX | Jefferson | 32 min |
| Sep 13, 8:21 AM CDT | Special Weather Statement | MKX | Milwaukee, Ozaukee, Washington, Waukesha | 39 min |
| Sep 13, 1:13 PM CDT | Small Craft Advisory | MKX | 29 hr | |
| Sep 13, 3:51 PM CDT | Special Weather Statement | MKX | Dodge | 39 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.