Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 55, NWS Twin Cities, MN

June 28, 1997Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 28, 1997, 3:41 PM CDT for Polk County, Wisconsin. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 28, 1997, 3:41 PM CDT (20:41 UTC)
Expired
Jun 28, 1997, 4:30 PM CDT
In force
49 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Polk County, WI

The radar

The Minneapolis radar (KMPX), 111 km from the middle of the area, began a volume at 20:44 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
Jun 28, 3:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.7 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 1997-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1849 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 1997-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 201 square meters per square second.1939Sfc1 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
1849 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
891 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
201 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 282041 RRA
SVRMSP
WIC095-282130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
341 PM CDT SAT JUN 28 1997

* SEVERE THUNDERSTORM WARNING FOR
  POLK COUNTY - NORTHWESTERN WISCONSIN

* UNTIL 430 PM CDT
 
* SOME LOCATIONS AFFECTED
    CUSHING
    LUCK
    BALSAM LAKE
    AMERY

* AT 335 PM CDT DOPPLER RADAR INDICATED A LINE OF SEVERE STORMS
  FROM NEAR GRANTSBURG WISCONSIN TO CENTER CITY MINNESOTA.  THE
  STORMS WERE MOVING EAST AT 35 MPH.

  CHISAGO COUNTY SHERIFF REPORTED WINDS UP TO 50 MPH AND PEA TO
  MARBLE SIZE HAIL AS A PORTION OF THESE STORMS MOVED THROUGH
  NORTHERN CHISAGO COUNTY.

DAMAGING WINDS AND LARGE HAIL ARE LINKELY.  GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.


MCBEATH PETERS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 10:02 AM CDTSevere Thunderstorm WarningMPXPolk, Saint Croix58 min
Jun 28, 10:26 AM CDTSevere Thunderstorm WarningMPXPierce64 min
Jun 28, 5:22 PM CDTSevere Thunderstorm WarningMPXEau Claire, Pepin38 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1997Every severe thunderstorm warning in 1997

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.