Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 73, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 7, 2021, 11:45 AM CDT for Jefferson County, Milwaukee County, Waukesha County, Wisconsin. It was in force for 60 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 7, 2021, 11:45 AM CDT (16:45 UTC)
- Expired
- Sep 7, 2021, 12:45 PM CDT
- In force
- 60 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Jefferson County, WI, Milwaukee County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 43 km from the middle of the area, began a volume at 16:48 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 7, 11:21 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 4.8 hours before the alert went out and 173 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.
095
WUUS53 KMKX 071645
SVRMKX
WIC055-079-133-071745-
/O.NEW.KMKX.SV.W.0073.210907T1645Z-210907T1745Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1145 AM CDT Tue Sep 7 2021
The National Weather Service in Milwaukee/Sullivan has issued a
* Severe Thunderstorm Warning for...
Southern Milwaukee County in southeastern Wisconsin...
Southern Waukesha County in southeastern Wisconsin...
Southeastern Jefferson County in southeastern Wisconsin...
* Until 1245 PM CDT.
* At 1145 AM CDT, severe thunderstorms were located along a line
extending from near Okauchee Lake to near Lake Koshkonong, moving
east at 55 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Severe thunderstorms will be near...
Delafield and Wales around 1150 AM CDT.
Waukesha and Pewaukee around 1155 AM CDT.
New Berlin, Brookfield, Palmyra and Brookfield around 1200 PM CDT.
Milwaukee, Wauwatosa and Elm Grove around 1205 PM CDT.
West Milwaukee, Ottawa and North Prairie around 1210 PM CDT.
Mukwonago and Milwaukee Hoan Bridge around 1215 PM CDT.
Vernon around 1220 PM CDT.
Big Bend around 1225 PM CDT.
Other locations impacted by these severe thunderstorms include State
Fair Park, Waterville, Marquette University, Mitchell Park Domes,
Milwaukee Co Zoo, Miller Park, Genesee Depot, Genesee, Milwaukee
South Shore Park and Maier Festival Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4284 8784 4285 8873 4305 8856 4304 8789
4301 8789 4296 8785 4288 8785 4285 8782
TIME...MOT...LOC 1645Z 267DEG 48KT 4310 8841 4285 8888
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
GEHRING2 follow-up statements
449
WWUS53 KMKX 071703
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1203 PM CDT Tue Sep 7 2021
WIC055-079-133-071745-
/O.CON.KMKX.SV.W.0073.000000T0000Z-210907T1745Z/
Milwaukee WI-Waukesha WI-Jefferson WI-
1203 PM CDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT
FOR SOUTHERN MILWAUKEE...SOUTHERN WAUKESHA AND SOUTHEASTERN JEFFERSON
COUNTIES...
At 1202 PM CDT, severe thunderstorms were located along a line
extending from near Butler to Palmyra, moving east at 55 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
These severe storms will be near...
Milwaukee, Wauwatosa, Brookfield, Elm Grove and West Milwaukee
around 1210 PM CDT.
Milwaukee Hoan Bridge around 1215 PM CDT.
Vernon around 1220 PM CDT.
Big Bend around 1225 PM CDT.
West Allis and Muskego around 1230 PM CDT.
Greenfield, Greendale and Hales Corners around 1235 PM CDT.
Oak Creek, St. Francis and Franklin around 1240 PM CDT.
South Milwaukee and Cudahy around 1245 PM CDT.
Other locations impacted by these severe thunderstorms include State
Fair Park, Waterville, Marquette University, Mitchell Park Domes,
Milwaukee Co Zoo, Miller Park, Genesee Depot, Genesee, Milwaukee
South Shore Park and Maier Festival Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4284 8784 4285 8873 4305 8856 4304 8789
4301 8789 4296 8785 4288 8785 4285 8782
TIME...MOT...LOC 1702Z 267DEG 48KT 4311 8812 4286 8859
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
GEHRING671
WWUS53 KMKX 071723
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1223 PM CDT Tue Sep 7 2021
WIC055-079-133-071745-
/O.CON.KMKX.SV.W.0073.000000T0000Z-210907T1745Z/
Milwaukee WI-Waukesha WI-Jefferson WI-
1223 PM CDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT
FOR SOUTHERN MILWAUKEE...SOUTHERN WAUKESHA AND SOUTHEASTERN JEFFERSON
COUNTIES...
At 1223 PM CDT, severe thunderstorms were located along a line
extending from Milwaukee to near Waterford North, moving east at 60
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
These severe storms will be near...
South Milwaukee, Cudahy, St. Francis and Milwaukee Hoan Bridge
around 1230 PM CDT.
Other locations impacted by these severe thunderstorms include State
Fair Park, Waterville, Marquette University, Mitchell Park Domes,
Milwaukee Co Zoo, Miller Park, Genesee Depot, Genesee, Milwaukee
South Shore Park and Maier Festival Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
&&
LAT...LON 4285 8865 4305 8848 4304 8789 4301 8789
4296 8785 4288 8785 4285 8782 4284 8784
TIME...MOT...LOC 1723Z 276DEG 51KT 4303 8793 4280 8826
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
WOODThe 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, 11:01 AM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Dodge, Jefferson | 59 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.