Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 322, NWS Twin Cities, MN

August 14, 2007Dunn County, Pepin County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 14, 2007, 12:05 AM CDT for Dunn County, Pepin County, Wisconsin. It was in force for 55 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 14, 2007, 12:05 AM CDT (05:05 UTC)
Expired: Aug 14, 2007, 1:00 AM CDT
In force: 55 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Dunn County, WI, Pepin County, WI

The radar

The La Crosse radar (KARX), 114 km from the middle of the area, began a volume at 05:08 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
Aug 14, 12:30 AM CDT	TSTM WND DMG	2 N Pepin, WI	NUMEROUS LARGE TREES DOWN. SOME 12 INCH IN DIAMETER.

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
Aug 13, 6:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.1 hours before the alert went out and 127 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2096 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 1133 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 409 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 140507
SVRMPX
WIC033-091-140600-
/O.NEW.KMPX.SV.W.0322.070814T0505Z-070814T0600Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1205 AM CDT TUE AUG 14 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 100 AM CDT

* AT 1204 AM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS...CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 15 MILES NORTHWEST OF DURAND TO 15
  MILES WEST OF DURAND TO 27 MILES WEST OF DURAND...AND MOVING EAST
  AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DURAND...
  EAU GALLE...
  ARKANSAW...
  PORCUPINE...

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 4484 9213 4455 9213 4452 9230 4443 9210
      4460 9203 4460 9166 4485 9167

$$

1 follow-up statement

000 
WWUS53 KMPX 140553
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1252 AM CDT TUE AUG 14 2007

WIC033-091-140602-
/O.EXP.KMPX.SV.W.0322.000000T0000Z-070814T0600Z/
DUNN WI-PEPIN WI-
1252 AM CDT TUE AUG 14 2007

...THE SEVERE THUNDERSTORM WARNING FOR PEPIN AND DUNN COUNTIES
EXPIRES AT 100 AM CDT...

SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS SOUTHEAST DUNN COUNTY 
AND PEPIN COUNTY BUT WILL BE BELOW SEVERE LIMITS. THUS THE WARNING 
WILL BE ALLOWED TO EXPIRE.

LAT...LON 4484 9213 4455 9213 4452 9230 4443 9210
      4460 9203 4460 9166 4485 9167

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 9:15 PM CDT	Severe Thunderstorm Warning	MPX	Polk, Saint Croix	60 min
Aug 13, 10:00 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Pepin, Pierce	60 min
Aug 13, 10:15 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	30 min
Aug 13, 10:21 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Eau Claire	54 min
Aug 13, 11:10 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	31 min
Aug 13, 11:30 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	60 min
Aug 13, 11:37 PM CDT	Severe Thunderstorm Warning	MPX	Pierce	53 min
Aug 14, 12:29 AM CDT	Severe Thunderstorm Warning	MPX	Pierce	48 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2007 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.