Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 278, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 4, 2012, 5:19 PM CDT for Eau Claire County, Wisconsin. It was in force for 26 min. 3 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 4, 2012, 5:19 PM CDT (22:19 UTC)
- Expired
- Sep 4, 2012, 5:45 PM CDT
- In force
- 26 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Eau Claire County, WI
The radar
The La Crosse radar (KARX), 107 km from the middle of the area, began a volume at 22:22 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 4, 5:23 PM CDT | HAIL 0.75 | 2 N Brackett, WI | |
| Sep 4, 5:46 PM CDT | HAIL 1.75 | 3 S Fall Creek, WI | |
| Sep 4, 5:46 PM CDT | HAIL 2 | 3 S Fall Creek, WI |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 4, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 10.3 hours before the alert went out and 185 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
- 1446 J/kg
- Mixed-layer CIN
- -171 J/kg
- Mixed-layer LCL
- 1471 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 221 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.8
The text
As transmitted, in the capitals the NWS used until 2016.
646 WUUS53 KMPX 042219 SVRMPX WIC035-042245- /O.NEW.KMPX.SV.W.0278.120904T2219Z-120904T2245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 519 PM CDT TUE SEP 4 2012 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN... * UNTIL 545 PM CDT * AT 513 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS STORM WAS LOCATED 6 MILES SOUTH OF EAU CLAIRE...AND MOVING EAST AT 30 MPH. LOCATIONS IN THE WARNING INCLUDE... BRACKETT... FALL CREEK... LUDINGTON... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 4484 9108 4469 9109 4470 9153 4484 9152 TIME...MOT...LOC 2219Z 272DEG 26KT 4474 9139 WIND...HAIL 60MPH 1.25IN $$
1 follow-up statement
741 WWUS53 KMPX 042231 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 531 PM CDT TUE SEP 4 2012 WIC035-042245- /O.CON.KMPX.SV.W.0278.000000T0000Z-120904T2245Z/ EAU CLAIRE WI- 531 PM CDT TUE SEP 4 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN UNTIL 545 PM CDT... AT 527 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS OF 60 MPH. THIS STORM WAS LOCATED 10 MILES SOUTHEAST OF EAU CLAIRE...MOVING EAST AT 20 MPH. LOCATIONS IMPACTED INCLUDE... FALL CREEK AND LUDINGTON. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 4484 9108 4469 9109 4470 9153 4484 9152 TIME...MOT...LOC 2231Z 276DEG 19KT 4473 9131 WIND...HAIL 60MPH 1.75IN $$
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 3:55 PM CDT | Special Weather Statement | MPX | Chippewa | 50 min |
| Sep 4, 4:17 PM CDT | Severe Thunderstorm Warning | MPX | Barron, Chippewa, Rusk | 43 min |
| Sep 4, 4:55 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa | 50 min |
| Sep 4, 5:06 PM CDT | Severe Thunderstorm Warning | MPX | Eau Claire | 39 min |
| Sep 4, 5:39 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Eau Claire | 36 min |
| Sep 4, 6:11 PM CDT | Severe Thunderstorm Warning | MPX | Eau Claire | 30 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.