Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 80, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 13, 2021, 2:38 AM CDT for Jefferson County, Waukesha County, Wisconsin. It was in force for 52 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, 2:38 AM CDT (07:38 UTC)
- Expired
- Sep 13, 2021, 3:30 AM CDT
- In force
- 52 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Jefferson County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 15 km from the middle of the area, began a volume at 07:38 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, 7.6 hours before the alert went out and 161 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.
929
WUUS53 KMKX 130738
SVRMKX
WIC055-133-130830-
/O.NEW.KMKX.SV.W.0080.210913T0738Z-210913T0830Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
238 AM CDT Mon Sep 13 2021
The National Weather Service in Milwaukee/Sullivan has issued a
* Severe Thunderstorm Warning for...
Northwestern Waukesha County in southeastern Wisconsin...
Northeastern Jefferson County in southeastern Wisconsin...
* Until 330 AM CDT.
* At 237 AM CDT, a severe thunderstorm was located over Lake Mills,
moving east at 35 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Watertown, Hartland, Jefferson, Delafield, Wales, Okauchee Lake,
Oconomowoc, Ottawa, Johnson Creek, Dousman, Lac La Belle, Ixonia,
Rome, Nashotah, Milford, Waterville, Sullivan, Oconomowoc Lake,
Chenequa and Mapleton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4298 8887 4318 8886 4320 8858 4319 8836
4297 8834
TIME...MOT...LOC 0737Z 264DEG 29KT 4305 8887
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
BOXELL1 follow-up statement
179
WWUS53 KMKX 130812
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
312 AM CDT Mon Sep 13 2021
WIC055-130821-
/O.CAN.KMKX.SV.W.0080.000000T0000Z-210913T0830Z/
Jefferson WI-
312 AM CDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JEFFERSON COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4297 8854 4314 8854 4313 8835 4297 8834
TIME...MOT...LOC 0811Z 270DEG 28KT 4303 8852
$$
WIC133-130830-
/O.CON.KMKX.SV.W.0080.000000T0000Z-210913T0830Z/
Waukesha WI-
312 AM CDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 AM CDT
FOR NORTHWESTERN WAUKESHA COUNTY...
At 311 AM CDT, a severe thunderstorm was located over Dousman, or 7
miles southwest of Delafield, moving east at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Hartland, Delafield, Wales, Okauchee Lake, Oconomowoc, Ottawa,
Dousman, Lac La Belle, Nashotah, Waterville, Oconomowoc Lake,
Chenequa, Summit and Lapham Peak St Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4297 8854 4314 8854 4313 8835 4297 8834
TIME...MOT...LOC 0811Z 270DEG 28KT 4303 8852
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, 1:55 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson | 50 min |
| Sep 13, 2:15 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Iowa | 45 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.