Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 76, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 12, 2021, 3:42 PM CDT for Dodge County, Washington County, Waukesha County, Wisconsin. It was in force for 33 min. 7 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, 3:42 PM CDT (20:42 UTC)
- Expired
- Sep 12, 2021, 4:15 PM CDT
- In force
- 33 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Dodge County, WI, Washington County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 43 km from the middle of the area, began a volume at 20:42 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, 4:09 PM CDT | HAIL 0.75 | 1 S Germantown, WI | REPORT FROM MPING: DIME (0.75 IN.). |
| Sep 12, 4:10 PM CDT | HAIL 0.75 | Menomonee Falls, WI | TIME ESTIMATED FROM RADAR. |
| Sep 12, 4:10 PM CDT | HAIL 0.75 | Menomonee Falls, WI | |
| Sep 12, 4:10 PM CDT | HAIL 1 | 3 Nne Lannon, WI | TIME ESTIMATED FROM RADAR. |
| Sep 12, 4:10 PM CDT | HAIL 1 | 3 Nne Lannon, WI | |
| Sep 12, 4:10 PM CDT | HAIL 1 | Germantown, WI | TIME ESTIMATED FROM RADAR. |
| Sep 12, 4:11 PM CDT | HAIL 0.75 | 2 Se Germantown, 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, 8.7 hours before the alert went out and 132 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.
664
WUUS53 KMKX 122042
SVRMKX
WIC027-131-133-122115-
/O.NEW.KMKX.SV.W.0076.210912T2042Z-210912T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
342 PM CDT Sun Sep 12 2021
The National Weather Service in Milwaukee/Sullivan has issued a
* Severe Thunderstorm Warning for...
Northeastern Waukesha County in southeastern Wisconsin...
Southern Washington County in southeastern Wisconsin...
Southeastern Dodge County in southeastern Wisconsin...
* Until 415 PM CDT.
* At 341 PM CDT, a severe thunderstorm was located near Lac La Belle,
or 8 miles east of Watertown, moving east at 45 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Menomonee Falls, Hartford, Sussex, Jackson, Slinger, Germantown,
Lannon, Richfield, Ashippun, Rubicon, Lebanon, Neosho, Colgate,
Holy Hill, Kirchhayn, Monches, Keowns and Hubertus.
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 4337 8804 4337 8806 4313 8807 4320 8854
4320 8869 4331 8869 4341 8804
TIME...MOT...LOC 2041Z 264DEG 39KT 4324 8856
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
DDV1 follow-up statement
786
WWUS53 KMKX 122055
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
355 PM CDT Sun Sep 12 2021
WIC027-122104-
/O.CAN.KMKX.SV.W.0076.000000T0000Z-210912T2115Z/
Dodge WI-
355 PM CDT Sun Sep 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DODGE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4337 8804 4337 8806 4313 8807 4318 8842
4335 8842 4341 8804
TIME...MOT...LOC 2054Z 264DEG 39KT 4326 8836
$$
WIC131-133-122115-
/O.CON.KMKX.SV.W.0076.000000T0000Z-210912T2115Z/
Waukesha WI-Washington WI-
355 PM CDT Sun Sep 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR NORTHEASTERN WAUKESHA AND SOUTHERN WASHINGTON COUNTIES...
At 354 PM CDT, a severe thunderstorm was located near Hartford,
moving east at 45 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Menomonee Falls, Hartford, Sussex, Jackson, Slinger, Germantown,
Lannon, Richfield, Colgate, Holy Hill, Kirchhayn, Monches, Keowns and
Hubertus.
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 4337 8804 4337 8806 4313 8807 4318 8842
4335 8842 4341 8804
TIME...MOT...LOC 2054Z 264DEG 39KT 4326 8836
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
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, 3:59 PM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Ozaukee | 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.