Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 382, NWS Twin Cities, MN

September 20, 2007Dunn County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2007, 9:29 PM CDT for Dunn County, Saint Croix County, Wisconsin. It was in force for 61 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 20, 2007, 9:29 PM CDT (02:29 UTC)
Expired
Sep 20, 2007, 10:30 PM CDT
In force
61 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

Counties Dunn County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 132 km from the middle of the area, began a volume at 02:30 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 20, 5:37 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.5 hours before the alert went out and 135 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 00:00Z on 2007-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1394 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 00:00Z on 2007-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
1394 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
838 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
567 m²/s²
Significant tornado parameter
0.0
Supercell composite
24.8

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 210229
SVRMPX
WIC033-109-210330-
/O.NEW.KMPX.SV.W.0382.070921T0229Z-070921T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
929 PM CDT THU SEP 20 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 1030 PM CDT

* AT 926 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 65 MPH.  THIS
  STORM WAS LOCATED 4 MILES SOUTHWEST OF GLENWOOD CITY...OR ABOUT 17
  MILES NORTHWEST OF MENOMONIE...AND MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GLENWOOD CITY...
  BOYCEVILLE...
  COLFAX...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FRIDAY
MORNING FOR NORTHWESTERN WISCONSIN.

LAT...LON 4521 9169 4496 9167 4490 9225 4510 9227
TIME...MOT...LOC 0229Z 245DEG 34KT 4502 9218

$$

JPR
3 follow-up statements
000 
WWUS53 KMPX 210249
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
949 PM CDT THU SEP 20 2007

WIC033-210330-
/O.CON.KMPX.SV.W.0382.000000T0000Z-070921T0330Z/
DUNN WI-
949 PM CDT THU SEP 20 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR DUNN COUNTY...

AT 944 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 65 MPH.  THIS STORM WAS LOCATED NEAR WHEELER...OR
ABOUT 7 MILES EAST OF BOYCEVILLE...AND MOVING EAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE WHEELER...TAINTER LAKE...
KNAPP...COLFAX AND BOYCEVILLE.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 4494 9181 4495 9183 4493 9188 4494 9193
      4492 9196 4492 9212 4515 9206 4520 9169
      4496 9167
TIME...MOT...LOC 0249Z 252DEG 42KT 4508 9182

$$
000 
WWUS53 KMPX 210308
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1006 PM CDT THU SEP 20 2007

WIC033-210330-
/O.CON.KMPX.SV.W.0382.000000T0000Z-070921T0330Z/
DUNN WI-
1006 PM CDT THU SEP 20 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR DUNN COUNTY...

AT 958 PM CDT...A 57 MPH WIND GUST OCCURRED IN CEDAR FALLS...WHICH 
IS ABOUT 2 MILES NORTH OF MENOMONIE. 

AT 1003 PM CDT... THE SEVERE STORM WAS LOCATED NEAR COLFAX...
AND MOVING EAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE TAINTER LAKE AND COLFAX.

LAT...LON 4494 9179 4495 9183 4494 9184 4494 9187
      4518 9187 4518 9180 4520 9177 4519 9169
      4501 9167 4496 9169
TIME...MOT...LOC 0306Z 252DEG 42KT 4504 9166

$$
000 
WWUS53 KMPX 210322
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1021 PM CDT THU SEP 20 2007

WIC033-210331-
/O.EXP.KMPX.SV.W.0382.000000T0000Z-070921T0330Z/
DUNN WI-
1021 PM CDT THU SEP 20 2007

...THE SEVERE THUNDERSTORM WARNING FOR DUNN COUNTY EXPIRES AT 1030 PM
CDT...

SEVERE STORMS HAVE MOVED OUT OF COUNTY. HOWEVER...MORE THUNDERSTORMS 
WERE WEST OF THE AREA. REMAIN ALERT FOR POSSIBLE ADDITIONAL WARNINGS.

LAT...LON 4494 9179 4495 9183 4494 9184 4494 9187
      4518 9187 4518 9180 4520 9177 4519 9169
      4501 9167 4496 9169
TIME...MOT...LOC 0321Z 252DEG 42KT 4509 9142

$$

JPR

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 8:51 PM CDTSevere Thunderstorm WarningMPXChippewa, Dunn, Eau Claire21 min
Sep 20, 9:44 PM CDTSevere Thunderstorm WarningMPXBarron, Polk31 min
Sep 20, 10:11 PM CDTSevere Thunderstorm WarningMPXChippewa64 min
Sep 20, 10:16 PM CDTSevere Thunderstorm WarningMPXBarron44 min
Sep 21, 5:54 AM CDTSevere Thunderstorm WarningMPXPolk36 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2007Every severe thunderstorm warning in 2007

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.