Alert archive / Wisconsin / Special Weather Statements in 2021
Special Weather Statement, NWS Milwaukee, WI
NWS Milwaukee, WI issued this special weather statement at Sep 13, 2021, 8:21 AM CDT for 4 counties in Wisconsin. It was in force for 39 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, 8:21 AM CDT (13:21 UTC)
- Expired
- Sep 13, 2021, 9:00 AM CDT
- In force
- 39 min
- Issued by
- NWS Milwaukee, WI
- Hail
- 0.75 in
- Wind
- 30
Counties Milwaukee County, WI, Ozaukee County, WI, Washington County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 47 km from the middle of the area, began a volume at 13:24 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, 1.4 hours before the alert went out and 145 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
- 921 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
627
WWUS83 KMKX 131321
SPSMKX
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
821 AM CDT Mon Sep 13 2021
WIZ059-060-065-066-131400-
Waukesha WI-Milwaukee WI-Washington WI-Ozaukee WI-
821 AM CDT Mon Sep 13 2021
...A strong thunderstorm will impact portions of Ozaukee, Milwaukee,
Waukesha and Washington Counties through 900 AM CDT...
At 820 AM CDT, Doppler radar was tracking a strong thunderstorm over
Hartland, moving east at 40 mph.
HAZARD...Winds in excess of 30 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Milwaukee, Waukesha, West Allis, Wauwatosa, New Berlin, Brookfield,
Greenfield, Menomonee Falls, Oak Creek, West Bend, Muskego, Mequon,
South Milwaukee, Cudahy, Hartford, Whitefish Bay, Greendale,
Pewaukee, Brown Deer and Grafton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4338 8787 4326 8791 4318 8788 4312 8790
4307 8787 4302 8790 4296 8785 4288 8785
4285 8782 4284 8854 4315 8854 4320 8853
4320 8842 4354 8840 4354 8780 4349 8779
TIME...MOT...LOC 1320Z 262DEG 39KT 4311 8835
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...30 MPH
$$
MRCThe 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, 2:38 AM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Waukesha | 52 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, 1:13 PM CDT | Small Craft Advisory | MKX | 29 hr | |
| Sep 13, 3:51 PM CDT | Special Weather Statement | MKX | Dodge | 39 min |
Nearby
Special Weather Statements in Wisconsin, 2021Every special weather statement 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.