Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 276, NWS Twin Cities, MN

August 6, 2008Polk County, Wisconsin; Chisago County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 6, 2008, 1:44 PM CDT for Polk County, Wisconsin; Chisago County, Minnesota. It was in force for 46 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
Aug 6, 2008, 1:44 PM CDT (18:44 UTC)
Expired
Aug 6, 2008, 2:30 PM CDT
In force
46 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon

Counties Chisago County, MN, Polk County, WI

The radar

The Minneapolis radar (KMPX), 99 km from the middle of the area, began a volume at 19:03 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

Minneapolis, MN (KMPX), launched 12:00Z, 6.7 hours before the alert went out and 101 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 2008-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2008-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 square meters per square second.1939587897117Sfc1 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
33 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
1396 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 061844
SVRMPX
MNC025-WIC095-061930-
/O.NEW.KMPX.SV.W.0276.080806T1844Z-080806T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
144 PM CDT WED AUG 6 2008

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...  
  POLK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 230 PM CDT

* AT 140 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING NICKEL SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. 
  THIS STORM WAS LOCATED 10 MILES NORTH OF SHAFER...OR ABOUT 17 MILES
  WEST OF BALSAM LAKE...AND MOVING SOUTHEAST AT 33 MPH.

* SOME LOCATIONS INCLUDE...
  SHAFER...
  TAYLORS FALLS...
  ST CROIX FALLS...
  CENTURIA...
  OSCEOLA...
  DRESSER...
  BALSAM LAKE...
  AMERY...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS AND LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM. 
WHILE NOT IMMEDIATELY LIKELY...A WEAK TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A 
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4545 9228 4526 9235 4522 9267 4531 9276
      4551 9288 4558 9279
TIME...MOT...LOC 1844Z 312DEG 28KT 4551 9275

$$
1 follow-up statement
000 
WWUS53 KMPX 061909
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
209 PM CDT WED AUG 6 2008

MNC025-WIC095-061930-
/O.CON.KMPX.SV.W.0276.000000T0000Z-080806T1930Z/
CHISAGO MN-POLK WI-
209 PM CDT WED AUG 6 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR SOUTHWESTERN POLK AND SOUTHEASTERN CHISAGO COUNTIES...

AT 207 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING NICKEL SIZE HAIL AND DAMAGING WINDS IN EXCESS OF
60 MPH.  THE SEVERE STORM WAS LOCATED NEAR ST CROIX FALLS...OR ABOUT
OVER ST CROIX FALLS...AND MOVING SOUTHEAST AT 32 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE WANDEROOS...LITTLE FALLS...
EAST FARMINGTON...DERONDA...TAYLORS FALLS...SHAFER...ST CROIX
FALLS...OSCEOLA...DRESSER AND CENTURIA.

A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE REMAINDER OF 
SOUTHERN CHISAGO COUNTY UNTIL 245 PM CDT.

PREPARE IMMEDIATELY FOR DAMAGING WINDS AND LARGE HAIL. SEEK SHELTER
NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

REPORT ANY DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY...FOR RELAY
TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4526 9235 4522 9267 4531 9276 4543 9283
      4546 9286 4550 9271 4544 9241 4535 9232
TIME...MOT...LOC 1909Z 311DEG 27KT 4540 9262

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 2:30 PM CDTSevere Thunderstorm WarningMPXSaint Croix45 min
Aug 6, 2:03 PM CDTSevere Thunderstorm WarningMPXAnoka, Chisago, Isanti42 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2008Severe Thunderstorm Warnings in Minnesota, 2008Every severe thunderstorm warning in 2008

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.