Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 93, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 17, 2012, 2:55 PM CDT for Rock County, Walworth County, Wisconsin. It was in force for 26 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 17, 2012, 2:55 PM CDT (19:55 UTC)
- Expired
- Sep 17, 2012, 3:21 PM CDT
- In force
- 26 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Rock County, WI, Walworth County, WI
The radar
The Milwaukee radar (KMKX), 57 km from the middle of the area, began a volume at 19:59 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
Davenport, (KDVN), launched 12:00Z, 7.9 hours before the alert went out and 164 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
- 452 J/kg
- Mixed-layer CIN
- -118 J/kg
- Mixed-layer LCL
- 683 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- -13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
673 WUUS53 KMKX 171955 SVRMKX WIC105-127-172100- /O.NEW.KMKX.SV.W.0093.120917T1955Z-120917T2100Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 255 PM CDT MON SEP 17 2012 THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN ROCK COUNTY IN SOUTH CENTRAL WISCONSIN... WESTERN WALWORTH COUNTY IN SOUTHEAST WISCONSIN... * UNTIL 400 PM CDT * AT 254 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL... AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES NORTHEAST OF DURAND...OR 9 MILES NORTHWEST OF ROCKTON...AND MOVING EAST AT 40 MPH. * LOCATIONS IMPACTED INCLUDE... BELOIT...DELAVAN LAKE...WILLIAMS BAY...ELKHORN...JANESVILLE AIRPORT...CLINTON...SHARON...DARIEN...WALWORTH...FONTANA-ON-GENEVA LAKE...COMO...AFTON...SHOPIERE...TIFFANY...EMERALD GROVE... AVALON...ALLENS GROVE...DELAVAN...FONTANA AND ABELLS CORNERS. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4250 8932 4255 8934 4276 8847 4249 8843 TIME...MOT...LOC 1955Z 251DEG 35KT 4251 8921 WIND...HAIL 60MPH 1.25IN $$ COLLAR
2 follow-up statements
807 WWUS53 KMKX 172003 SVSMKX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 303 PM CDT MON SEP 17 2012 WIC105-127-172100- /O.CON.KMKX.SV.W.0093.000000T0000Z-120917T2100Z/ WALWORTH WI-ROCK WI- 303 PM CDT MON SEP 17 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN ROCK AND WESTERN WALWORTH COUNTIES UNTIL 400 PM CDT... AT 259 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES NORTHWEST OF ROCKTON...MOVING EAST AT 30 MPH. LOCATIONS IMPACTED INCLUDE... BELOIT...DELAVAN LAKE...WILLIAMS BAY...ELKHORN...JANESVILLE AIRPORT...CLINTON...SHARON...DARIEN...WALWORTH...FONTANA-ON-GENEVA LAKE...COMO...AFTON...SHOPIERE...TIFFANY...EMERALD GROVE... AVALON...ALLENS GROVE...DELAVAN...FONTANA AND ABELLS CORNERS. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4250 8932 4255 8934 4276 8847 4249 8843 TIME...MOT...LOC 2003Z 259DEG 25KT 4251 8915 WIND...HAIL 60MPH 1.25IN $$ COLLAR
301 WWUS53 KMKX 172021 SVSMKX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 321 PM CDT MON SEP 17 2012 WIC105-127-172031- /O.CAN.KMKX.SV.W.0093.000000T0000Z-120917T2100Z/ WALWORTH WI-ROCK WI- 321 PM CDT MON SEP 17 2012 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ROCK AND WESTERN WALWORTH COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM. LAT...LON 4250 8932 4255 8934 4276 8847 4249 8843 TIME...MOT...LOC 2021Z 259DEG 25KT 4253 8898 $$ COLLAR
The office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 3:46 AM CDT | Small Craft Advisory | MKX | 42 hr | |
| Sep 17, 2:58 PM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Waukesha | 62 min |
| Sep 17, 3:06 PM CDT | Special Marine Warning | MKX | 84 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2012Every severe thunderstorm warning in 2012
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.