Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 232, NWS Twin Cities, MN

August 8, 2004Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 8, 2004, 7:06 PM CDT for Polk County, Wisconsin. It was in force for 54 min. 2 reports 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, 2004, 7:06 PM CDT (00:06 UTC)
Expired: Aug 8, 2004, 8:00 PM CDT
In force: 54 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Polk County, WI

The radar

The Minneapolis radar (KMPX), 111 km from the middle of the area, began a volume at 00:08 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 8, 7:40 PM CDT	HAIL 0.75	Amery, WI
Aug 8, 7:40 PM CDT	HAIL 0.75	Amery, WI

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 8, 5:20 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.1 hours before the alert went out and 113 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: 2371 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1041 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.5
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 090006
SVRMPX
WIC095-090100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
706 PM CDT SUN AUG 8 2004

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  POLK COUNTY IN NORTHWEST WISCONSIN

* UNTIL 800 PM CDT

* AT 704 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WINDS. THIS STORM WAS
  LOCATED 11 MILES SOUTHWEST OF BALSAM LAKE...AND MOVING EAST AT 25
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  AMERY.
  BALSAM LAKE.
  SAINT CROIX FALLS.
  DRESSER.
  MILLTOWN.


LAT...LON 4562 9265 4545 9262 4525 9270 4525 9221
      4544 9219 4567 9220

$$

MBK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 7:29 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	46 min
Aug 8, 7:37 PM CDT	Tornado Warning	MPX	Saint Croix	38 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2004 Every severe thunderstorm warning in 2004

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.