Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 77, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 12, 2021, 3:59 PM CDT for Milwaukee County, Ozaukee County, Wisconsin. It was in force for 33 min. 2 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 12, 2021, 3:59 PM CDT (20:59 UTC)
- Expired
- Sep 12, 2021, 4:32 PM CDT
- In force
- 33 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Milwaukee County, WI, Ozaukee County, WI
The radar
The Milwaukee radar (KMKX), 58 km from the middle of the area, began a volume at 21:01 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 12, 4:19 PM CDT | HAIL 0.7 | Mequon, WI | CORRECTS PREVIOUS HAIL REPORT FROM MEQUON. TIME ESTIMATED FROM RADAR. |
| Sep 12, 4:28 PM CDT | HAIL 0.75 | 1 W Bayside, WI | REPORT FROM MPING: DIME (0.75 IN.). |
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, 9.0 hours before the alert went out and 140 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
- 1526 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
294
WUUS53 KMKX 122059
SVRMKX
WIC079-089-122145-
/O.NEW.KMKX.SV.W.0077.210912T2059Z-210912T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
359 PM CDT Sun Sep 12 2021
The National Weather Service in Milwaukee/Sullivan has issued a
* Severe Thunderstorm Warning for...
Southwestern Ozaukee County in southeastern Wisconsin...
Northern Milwaukee County in southeastern Wisconsin...
* Until 445 PM CDT.
* At 358 PM CDT, a severe thunderstorm was located near Germantown,
moving east at 55 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Northern Milwaukee, Mequon, Whitefish Bay, Brown Deer, Grafton,
Cedarburg, Port Washington, Fox Point, Saukville, Bayside,
Thiensville, Glendale, River Hills and Shorewood.
People attending The Packer Viewing Party in Shorewood should seek
safe shelter immediately!
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 4312 8807 4337 8806 4339 8786 4337 8788
4330 8789 4328 8790 4324 8791 4318 8788
4312 8790 4310 8787 4308 8787
TIME...MOT...LOC 2058Z 266DEG 46KT 4324 8823
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
DDV2 follow-up statements
405
WWUS53 KMKX 122125
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
425 PM CDT Sun Sep 12 2021
WIC079-089-122145-
/O.CON.KMKX.SV.W.0077.000000T0000Z-210912T2145Z/
Ozaukee WI-Milwaukee WI-
425 PM CDT Sun Sep 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHWESTERN OZAUKEE AND NORTHERN MILWAUKEE COUNTIES...
At 425 PM CDT, a severe thunderstorm was located 9 miles northeast of
Bayside, moving east at 55 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Northern Milwaukee, Mequon, Whitefish Bay, Brown Deer, Grafton,
Cedarburg, Fox Point, Bayside, Thiensville, Glendale, River Hills and
Shorewood.
People attending The Packer Viewing Party in Shorewood should seek
safe shelter immediately!
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 4312 8807 4317 8801 4332 8801 4333 8789
4330 8789 4328 8790 4324 8791 4318 8788
4312 8790 4310 8787 4308 8787
TIME...MOT...LOC 2125Z 266DEG 46KT 4326 8775
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
DDV533
WWUS53 KMKX 122132
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
432 PM CDT Sun Sep 12 2021
WIC079-089-122141-
/O.CAN.KMKX.SV.W.0077.000000T0000Z-210912T2145Z/
Ozaukee WI-Milwaukee WI-
432 PM CDT Sun Sep 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN OZAUKEE AND
NORTHERN MILWAUKEE COUNTIES IS CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
LAT...LON 4312 8807 4317 8801 4332 8801 4333 8789
4330 8789 4328 8790 4324 8791 4318 8788
4312 8790 4310 8787 4308 8787
TIME...MOT...LOC 2129Z 266DEG 46KT 4327 8764
$$
DDVThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 3:32 PM CDT | Special Weather Statement | MKX | Washington, Waukesha | 43 min |
| Sep 12, 3:42 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Washington, Waukesha | 33 min |
| Sep 12, 4:00 PM CDT | Special Marine Warning | MKX | 60 min | |
| Sep 12, 4:15 PM CDT | Special Weather Statement | MKX | Ozaukee | 30 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.