Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 280, NWS Twin Cities, MN

September 4, 2012Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 4, 2012, 6:11 PM CDT for Eau Claire County, Wisconsin. It was in force for 30 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 4, 2012, 6:11 PM CDT (23:11 UTC)
Expired
Sep 4, 2012, 6:41 PM CDT
In force
30 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), 93 km from the middle of the area, began a volume at 23:13 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 4, 3:27 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.2 hours before the alert went out and 207 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.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2012-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1446 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2012-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

129 
WUUS53 KMPX 042311
SVRMPX
WIC035-042345-
/O.NEW.KMPX.SV.W.0280.120904T2311Z-120904T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
611 PM CDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 645 PM CDT

* AT 609 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING HALF DOLLAR SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS
  STORM WAS LOCATED 8 MILES NORTH OF PRICE...OR ABOUT 23 MILES
  SOUTHEAST OF EAU CLAIRE...AND MOVING EAST AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  FAIRCHILD...

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 4459 9094 4458 9101 4461 9119 4478 9116
      4477 9091 4468 9091 4460 9091
TIME...MOT...LOC 2311Z 278DEG 18KT 4469 9106
WIND...HAIL 60MPH 1.25IN

$$
2 follow-up statements
026 
WWUS53 KMPX 042326
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
626 PM CDT TUE SEP 4 2012

WIC035-042345-
/O.CON.KMPX.SV.W.0280.000000T0000Z-120904T2345Z/
EAU CLAIRE WI-
626 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN UNTIL 645 PM CDT...

AT 623 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES NORTH OF PRICE...OR
25 MILES NORTHEAST OF WHITEHALL...MOVING EAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  FAIRCHILD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4459 9094 4458 9101 4461 9111 4477 9103
      4475 9092 4468 9091 4460 9091
TIME...MOT...LOC 2326Z 288DEG 16KT 4466 9100
WIND...HAIL 60MPH 1.00IN

$$
624 
WWUS53 KMPX 042341
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
641 PM CDT TUE SEP 4 2012

WIC035-042356-
/O.CAN.KMPX.SV.W.0280.000000T0000Z-120904T2345Z/
EAU CLAIRE WI-
641 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN EAU CLAIRE COUNTY
IN WEST CENTRAL WISCONSIN IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 4459 9094 4458 9101 4461 9111 4477 9103
      4475 9092 4468 9091 4460 9091
TIME...MOT...LOC 2341Z 290DEG 26KT 4462 9085

$$

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 4, 3:55 PM CDTSpecial Weather StatementMPXChippewa50 min
Sep 4, 4:17 PM CDTSevere Thunderstorm WarningMPXBarron, Chippewa, Rusk43 min
Sep 4, 4:55 PM CDTSevere Thunderstorm WarningMPXChippewa50 min
Sep 4, 5:06 PM CDTSevere Thunderstorm WarningMPXEau Claire39 min
Sep 4, 5:19 PM CDTSevere Thunderstorm WarningMPXEau Claire26 min
Sep 4, 5:39 PM CDTSevere Thunderstorm WarningMPXChippewa, Eau Claire36 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.