Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 36, NWS Twin Cities, MN

June 28, 1997Polk County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 28, 1997, 10:02 AM CDT for Polk County, Saint Croix County, Wisconsin. It was in force for 58 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 28, 1997, 10:02 AM CDT (15:02 UTC)
Expired: Jun 28, 1997, 11:00 AM CDT
In force: 58 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 98 km from the middle of the area, began a volume at 15:01 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
Jun 28, 10:05 AM CDT	Thunderstorm Wind 55	New Richmond Arpt, WI

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 3.0 hours before the alert went out and 101 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: 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.

826 
WUUS1 KMSP 281504 RRA
SVRMSP
WIC095-109-281600-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1002 AM CDT SAT JUN 28 1997

* SEVERE THUNDERSTORM WARNING FOR
  POLK COUNTY - NORTHWESTERN WISCONSIN
  ST CROIX COUNTY - WEST CENTRAL WISCONSIN

* UNTIL 1100 AM CDT
 
* SOME LOCATIONS AFFECTED
    AMERY
    NEW RICHMOND
    HUDSON
    SOMERSET

* AT 1000 AM CDT DOPPLER RADAR INDICATED SEVERE STORMS WITH
  LARGE HAIL...FROM 35 MILES NORTHEAST OF ST PAUL...NEAR BALSAM
  LAKE...TO THE EAST SIDE OF ST PAUL.  THE STORMS WERE MOVING
  EAST AT 15 MPH.

  VERY HEAVY RAIN AND STREET FLOODING IS POSSIBLE WITH SOME STORMS.

THIS IS A DANGEROUS STORM...WITH LARGE HAIL.  STAY INDOORS AWAY
FROM WINDOWS.


TDK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 10:26 AM CDT	Severe Thunderstorm Warning	MPX	Pierce	64 min
Jun 28, 3:41 PM CDT	Severe Thunderstorm Warning	MPX	Polk	49 min
Jun 28, 5:22 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire, Pepin	38 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1997 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.