Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 80, NWS Twin Cities, MN

August 8, 2009Dunn County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 8, 2009, 10:59 AM CDT for Dunn County, Saint Croix County, Wisconsin. It was in force for 46 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
Aug 8, 2009, 10:59 AM CDT (15:59 UTC)
Expired
Aug 8, 2009, 11:45 AM CDT
In force
46 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon

Counties Dunn County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 118 km from the middle of the area, began a volume at 16:00 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

TimeReportWhereRemark
Aug 8, 11:05 AM CDTHAIL 0.883 Se Cylon, WIHAILED FOR ABOUT FIVE MINUTES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 4.0 hours before the alert went out and 120 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 2009-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 368 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 2009-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 237 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
368 J/kg
Mixed-layer CIN
-296 J/kg
Mixed-layer LCL
896 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
237 m²/s²
0-3 km storm-relative helicity
260 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 081559
SVRMPX
WIC033-109-081645-
/O.NEW.KMPX.SV.W.0080.090808T1559Z-090808T1645Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1059 AM CDT SAT AUG 8 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...
  NORTHWESTERN DUNN COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 1145 AM CDT

* AT 1057 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
  WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR CYLON...OR
  ABOUT 9 MILES EAST OF NEW RICHMOND...AND MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  EMERALD...
  FOREST...
  CONNORSVILLE...
  RIDGELAND...

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 WILL UPROOT TREES AND DOWN POWER LINES.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4521 9215 4521 9212 4521 9183 4508 9189
      4505 9237 4516 9243
TIME...MOT...LOC 1559Z 249DEG 29KT 4510 9234

$$


MDB
1 follow-up statement
000 
WWUS53 KMPX 081631
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1131 AM CDT SAT AUG 8 2009

WIC109-081641-
/O.CAN.KMPX.SV.W.0080.000000T0000Z-090808T1645Z/
ST. CROIX WI-
1131 AM CDT SAT AUG 8 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. CROIX COUNTY
IS CANCELLED...

RADAR INDICATED THAT THE SEVERE STORM HAD MOVED OUT OF THE WARNED 
AREA. THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 4508 9205 4520 9206 4521 9183 4508 9189
TIME...MOT...LOC 1631Z 258DEG 28KT 4513 9199

$$

WIC033-081645-
/O.CON.KMPX.SV.W.0080.000000T0000Z-090808T1645Z/
DUNN WI-
1131 AM CDT SAT AUG 8 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CDT
FOR NORTH CENTRAL DUNN COUNTY...

AT 1131 AM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THE SEVERE STORM WAS LOCATED 7
MILES SOUTHWEST OF RIDGELAND...OR ABOUT 5 MILES EAST OF
CONNORSVILLE...AND MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
RIDGELAND.

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 4508 9205 4520 9206 4521 9183 4508 9189
TIME...MOT...LOC 1631Z 258DEG 28KT 4513 9199

$$


MDB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 12:24 AM CDTAreal Flood AdvisoryMPXPierce, Saint Croix3 hr
Aug 8, 12:28 AM CDTAreal Flood AdvisoryMPXPierce, Saint Croix3 hr
Aug 8, 2:03 AM CDTFlash Flood WarningMPXDunn, Eau Claire, Pepin, Pierce4 hr
Aug 8, 4:06 AM CDTFlash Flood WatchMPXChippewa, Dunn, Eau Claire, Pepin, Pierce, Saint Croix19 hr
Aug 8, 8:11 AM CDTSpecial Weather StatementMPXPolk49 min
Aug 8, 8:37 AM CDTSevere Thunderstorm WarningMPXPolk, Saint Croix38 min
Aug 8, 9:05 AM CDTSpecial Weather StatementMPXBarron40 min
Aug 8, 10:18 AM CDTSpecial Weather StatementMPXChippewa42 min
Aug 8, 10:33 AM CDTSpecial Weather StatementMPXSaint Croix57 min
Aug 8, 11:58 AM CDTSpecial Weather StatementMPXChippewa47 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2009Every severe thunderstorm warning in 2009

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.