Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 212, NWS Twin Cities, MN

August 23, 1997Dunn County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 23, 1997, 6:31 PM CDT for Dunn County, Wisconsin. It was in force for 44 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, 6:31 PM CDT (23:31 UTC)
Expired
Aug 23, 1997, 7:15 PM CDT
In force
44 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Dunn County, WI

The radar

The Minneapolis radar (KMPX), 132 km from the middle of the area, began a volume at 23:32 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 12:00Z, 11.5 hours before the alert went out and 135 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 1997-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1997-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 320 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
800 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
320 m²/s²
0-3 km storm-relative helicity
381 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 232332 RRA
SVRMSP
WIC033-240015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
631 PM CDT SAT AUG 23 1997


* SEVERE THUNDERSTORM WARNING FOR
  SOUTHEASTERN DUNN COUNTY - WEST CENTRAL WISCONSIN

* UNTIL 715 PM CDT

* SOME LOCATIONS AFFECTED
    ROCK FALLS
    MERIDEAN
    CARYVILLE

* AT 627 PM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL NEAR ROCK FALLS...OR ABOUT 15 MILES SOUTHEAST OF MENOMONIE.
  THE STORM WAS MOVING SLOWLY SOUTH AT 10 MPH.

THIS IS A DANGEROUS STORM WITH A HISTORY OF PRODUCING GOLF BALL
SIZE HAIL HAIL. 2 INCH DIAMETER HAIL FELL FOR APPROXIMATELY 20 TO
25 MINUTES 7 MILES NORTH OF MERIDEAN BEjTWEEN 6 AND 630 PM. STAY
INDOORS AWAY FROM WINDOWS.

A TORNADO WATCH IS IN EFFECT.  SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

MILLER


&

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 4:56 PM CDTSevere Thunderstorm WarningMPXBarron, Dunn49 min
Aug 23, 5:27 PM CDTSevere Thunderstorm WarningMPXDunn63 min
Aug 23, 6:09 PM CDTSevere Thunderstorm WarningMPXPepin46 min
Aug 23, 6:13 PM CDTSevere Thunderstorm WarningMPXEau Claire42 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.