Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 19, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at May 6, 2012, 9:54 AM CDT for Jefferson County, Rock County, Walworth County, Wisconsin. It was in force for 36 min. 1 report 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
- May 6, 2012, 9:54 AM CDT (14:54 UTC)
- Expired
- May 6, 2012, 10:30 AM CDT
- In force
- 36 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Jefferson County, WI, Rock County, WI, Walworth County, WI
The radar
The Milwaukee radar (KMKX), 32 km from the middle of the area, began a volume at 14:55 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 |
|---|---|---|---|
| May 6, 9:57 AM CDT | HAIL 1 | Sw Janesville, WI | ON THE SOUTHWEST SIDE OF TOWN. ALSO...MINOR STREET FLOODING ABOUT THE DEPTH OF THE CURB. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 2.9 hours before the alert went out and 187 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
- 2361 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 571 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 181 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 9.6
The text
As transmitted, in the capitals the NWS used until 2016.
948 WUUS53 KMKX 061454 SVRMKX WIC055-105-127-061530- /O.NEW.KMKX.SV.W.0019.120506T1454Z-120506T1530Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 954 AM CDT SUN MAY 6 2012 THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL JEFFERSON COUNTY IN SOUTHEAST WISCONSIN... EASTERN ROCK COUNTY IN SOUTH CENTRAL WISCONSIN... NORTHWESTERN WALWORTH COUNTY IN SOUTHEAST WISCONSIN... * UNTIL 1030 AM CDT * AT 951 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR DOWNTOWN JANESVILLE...AND MOVING NORTHEAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... MILTON AROUND 1005 AM CDT. WHITEWATER AROUND 1025 AM CDT. OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE EMERALD GROVE AND JOHNSTOWN CENTER. 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 4293 8877 4280 8861 4257 8902 4273 8915 TIME...MOT...LOC 1454Z 230DEG 29KT 4269 8900 WIND...HAIL <50MPH 1.00IN $$
3 follow-up statements
415 WWUS53 KMKX 061502 SVSMKX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1002 AM CDT SUN MAY 6 2012 WIC055-105-127-061530- /O.CON.KMKX.SV.W.0019.000000T0000Z-120506T1530Z/ JEFFERSON WI-WALWORTH WI-ROCK WI- 1002 AM CDT SUN MAY 6 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN ROCK...NORTHWESTERN WALWORTH AND SOUTH CENTRAL JEFFERSON COUNTIES UNTIL 1030 AM CDT... AT 1000 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR MILTON...MOVING NORTHEAST AT 35 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... WHITEWATER AROUND 1025 AM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4259 8899 4277 8903 4293 8877 4280 8861 TIME...MOT...LOC 1502Z 230DEG 29KT 4273 8893 WIND...HAIL <50MPH 1.00IN $$ MBK
413 WWUS53 KMKX 061519 SVSMKX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1019 AM CDT SUN MAY 6 2012 WIC055-105-127-061530- /O.CON.KMKX.SV.W.0019.000000T0000Z-120506T1530Z/ JEFFERSON WI-WALWORTH WI-ROCK WI- 1019 AM CDT SUN MAY 6 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN ROCK...NORTHWESTERN WALWORTH AND SOUTH CENTRAL JEFFERSON COUNTIES UNTIL 1030 AM CDT... AT 1014 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED 5 MILES EAST OF MILTON...MOVING NORTHEAST AT 35 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... WHITEWATER AROUND 1025 AM CDT. 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 4259 8899 4281 8892 4293 8877 4280 8861 TIME...MOT...LOC 1519Z 230DEG 29KT 4280 8880 WIND...HAIL <50MPH 1.00IN $$ MBK
064 WWUS53 KMKX 061528 SVSMKX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1028 AM CDT SUN MAY 6 2012 WIC055-105-127-061537- /O.EXP.KMKX.SV.W.0019.000000T0000Z-120506T1530Z/ JEFFERSON WI-WALWORTH WI-ROCK WI- 1028 AM CDT SUN MAY 6 2012 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ROCK... NORTHWESTERN WALWORTH AND SOUTH CENTRAL JEFFERSON COUNTIES WILL EXPIRE AT 1030 AM CDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. HOWEVER HAIL TO ONE HALF INCH AND GUSTY WINDS OF 25 TO 35 MPH ARE STILL POSSIBLE WITH THIS THUNDERSTORM. LAT...LON 4259 8899 4281 8892 4293 8877 4280 8861 TIME...MOT...LOC 1527Z 230DEG 29KT 4284 8873 $$ MBK
The office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 7:52 AM CDT | Severe Thunderstorm Warning | MKX | Marquette | 24 min |
| May 6, 8:29 AM CDT | Severe Thunderstorm Warning | MKX | Columbia, Green Lake, Marquette | 31 min |
| May 6, 9:10 AM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dodge, Fond du Lac, Green Lake | 30 min |
| May 6, 9:32 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson, Rock | 28 min |
| May 6, 10:12 AM CDT | Severe Thunderstorm Warning | MKX | Jefferson | 33 min |
| May 6, 12:22 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Milwaukee, Racine, Walworth, Waukesha | 23 min |
| May 6, 12:27 PM CDT | Special Marine Warning | MKX | 40 min | |
| May 6, 6:00 PM CDT | Severe Thunderstorm Warning | MKX | Walworth | 30 min |
| May 6, 6:46 PM CDT | Severe Thunderstorm Warning | MKX | Racine, Walworth | 29 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.