Alert archive / Wisconsin / Tornado Warnings in 1997

Tornado Warning 37, NWS Twin Cities, MN

August 23, 1997Pierce County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Aug 23, 1997, 7:09 PM CDT for Pierce County, Saint Croix County, Wisconsin. It was in force for 36 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
Aug 23, 1997, 7:09 PM CDT (00:09 UTC)
Expired
Aug 23, 1997, 7:45 PM CDT
In force
36 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 89 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 23, 5:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.2 hours before the alert went out and 92 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 1997-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3368 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 00:00Z on 1997-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 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
3368 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1119 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
207 m²/s²
Significant tornado parameter
2.0
Supercell composite
12.4

Open this sounding in Storm Lab

The text

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

497 
WFUS1 KMSP 240010 RRA
TORMSP
WIC093-109-240045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
709 PM CDT SAT AUG 23 1997

* TORNADO WARNING FOR
  NORTHERN PIERCE COUNTY - WEST CENTRAL WISCONSIN
  SOUTHWESTERN ST. CROIX COUNTY - WEST CENTRAL WISCONSIN

* UNTIL 745 PM CDT

* SOME LOCATIONS AFFECTED
    RIVER FALLS
    BELDENVILLE
    AREAS EAST OF RIVER FALLS

* AT 708 PM CDT DOPPLER RADAR DETECTED A DEVELOPING TORNADO 3
  MILES NORTHEAST OF RIVER FALLS...OR ABOUT 25 MILES EAST OF ST
  PAUL.  THE STORM WAS MOVING SLOWLY SOUTH AT 10 MPH.

PUBLIC REPORTS OF FUNNEL CLOUDS HAVE ALSO BEEN RECEIVED FROM THE
AREA JUST NORTHEAST OF RIVER FALLS.

GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR

MILLER


&

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 7:44 PM CDTTornado WarningMPXPierce31 min

Nearby

Tornado Warnings in Wisconsin, 1997Every tornado warning in 1997Tornadoes 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.