Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 54, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 11, 2021, 5:49 PM CDT for Milwaukee County, Waukesha County, Wisconsin. It was in force for 41 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
- Aug 11, 2021, 5:49 PM CDT (22:49 UTC)
- Expired
- Aug 11, 2021, 6:30 PM CDT
- In force
- 41 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Milwaukee County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 47 km from the middle of the area, began a volume at 22:49 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 12:00Z, 10.8 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
- 1499 J/kg
- Mixed-layer CIN
- -136 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted.
482
WUUS53 KMKX 112249
SVRMKX
WIC079-133-112330-
/O.NEW.KMKX.SV.W.0054.210811T2249Z-210811T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
549 PM CDT Wed Aug 11 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...
* Until 630 PM CDT.
* At 549 PM CDT, a severe thunderstorm was located over Mukwonago,
moving east at 55 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.
* Locations impacted include...
Milwaukee, Waukesha, West Allis, New Berlin, Greenfield, Oak Creek,
Muskego, South Milwaukee, Cudahy, Greendale, St. Francis, Hales
Corners, Mukwonago, West Milwaukee, Franklin, Vernon, North
Prairie, Big Bend, Eagle and Genesee Depot.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4284 8784 4284 8850 4297 8850 4302 8790
4299 8788 4296 8785 4288 8785 4285 8783
4285 8782
TIME...MOT...LOC 2249Z 271DEG 48KT 4290 8836
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CMILLER2 follow-up statements
449
WWUS53 KMKX 112318
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
618 PM CDT Wed Aug 11 2021
WIC079-133-112330-
/O.CON.KMKX.SV.W.0054.000000T0000Z-210811T2330Z/
Milwaukee WI-Waukesha WI-
618 PM CDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHERN MILWAUKEE AND SOUTHEASTERN WAUKESHA COUNTIES...
At 618 PM CDT, a severe thunderstorm was located over South
Milwaukee, moving east at 55 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Milwaukee, Waukesha, West Allis, New Berlin, Greenfield, Oak Creek,
Muskego, South Milwaukee, Cudahy, Greendale, St. Francis, Hales
Corners, Mukwonago, West Milwaukee, Franklin, Vernon, Big Bend and
Milwaukee South Shore Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4285 8783 4284 8784 4285 8796 4284 8797
4284 8836 4298 8829 4302 8790 4296 8785
4288 8785
TIME...MOT...LOC 2318Z 271DEG 48KT 4289 8783
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CMILLER918
WWUS53 KMKX 112322
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
622 PM CDT Wed Aug 11 2021
WIC079-133-112332-
/O.EXP.KMKX.SV.W.0054.000000T0000Z-210811T2330Z/
Milwaukee WI-Waukesha WI-
622 PM CDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MILWAUKEE AND
SOUTHEASTERN WAUKESHA COUNTIES WILL EXPIRE AT 630 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 4285 8783 4284 8784 4285 8796 4284 8797
4284 8836 4298 8829 4302 8790 4296 8785
4288 8785
TIME...MOT...LOC 2322Z 271DEG 48KT 4289 8780
$$
CMILLERThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 7:05 PM CDT | Special Weather Statement | MKX | Jefferson | 25 min |
| Aug 10, 7:24 PM CDT | Severe Thunderstorm Warning | MKX | Sheboygan | 51 min |
| Aug 10, 7:43 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Milwaukee, Ozaukee, Racine | 32 min |
| Aug 10, 8:07 PM CDT | Special Marine Warning | MKX | 53 min | |
| Aug 10, 8:16 PM CDT | Special Marine Warning | MKX | 44 min | |
| Aug 11, 6:44 AM CDT | Small Craft Advisory | MKX | 15 hr | |
| Aug 11, 9:58 AM CDT | Special Weather Statement | MKX | Kenosha, Milwaukee, Racine, Rock, Walworth | 77 min |
| Aug 11, 10:06 AM CDT | Special Marine Warning | MKX | 84 min | |
| Aug 11, 2:46 PM CDT | Severe Thunderstorm Warning | MKX | Green Lake, Marquette | 59 min |
| Aug 11, 4:22 PM CDT | Severe Thunderstorm Warning | MKX | Iowa | 53 min |
| Aug 11, 5:05 PM CDT | Special Weather Statement | MKX | Iowa | 25 min |
| Aug 11, 5:10 PM CDT | Severe Thunderstorm Warning | MKX | Iowa | 50 min |
| Aug 11, 5:24 PM CDT | Special Weather Statement | MKX | Milwaukee | 36 min |
| Aug 11, 5:56 PM CDT | Special Marine Warning | MKX | 94 min | |
| Aug 11, 5:58 PM CDT | Special Weather Statement | MKX | Iowa | 47 min |
| Aug 11, 6:04 PM CDT | Tornado Warning | MKX | Iowa | 41 min |
| Aug 11, 6:24 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine, Walworth | 53 min |
| Aug 11, 6:34 PM CDT | Tornado Warning | MKX | Dane | 15 min |
| Aug 11, 6:48 PM CDT | Special Marine Warning | MKX | 57 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.