Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 187, NWS Twin Cities, MN

August 3, 1997Barron County, Dunn County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 1997, 9:10 PM CDT for Barron County, Dunn County, Saint Croix County, Wisconsin. It was in force for 60 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 3, 1997, 9:10 PM CDT (02:10 UTC)
Expired
Aug 3, 1997, 10:10 PM CDT
In force
60 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Barron County, WI, Dunn County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 122 km from the middle of the area, began a volume at 02:09 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.2 hours before the alert went out and 125 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 1997-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1028 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 1997-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
1028 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1282 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 040211 RRA
SVRMSP
WIC005-033-109-040310-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
910 PM CDT SUN AUG 3 1997

* SEVERE THUNDERSTORM WARNING FOR
  DUNN COUNTY - WEST CENTRAL WISCONSIN
  ST CROIX COUNTY - WEST CENTRAL WISCONSIN
  SOUTHWEST BARRON COUNTY - WEST CENTRAL WISCONSIN

* UNTIL 1010 PM CDT
 
* SOME LOCATIONS AFFECTED
    CYLON
    EMERALD
    BOYCEVILLE
    MENOMONIE

* AT 910 PM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL AND DAMAGING WINDS NEAR CLEAR LAKE OR ABOUT 30 MILES
  NORTHWEST OF MENOMONIE.  THE STORM WAS MOVING SOUTHEAST AT 35 MPH.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  GO INSIDE A S~TURDY
BUILDING AND STAY AWAY FROM WINDOWS.


MBK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 8:13 PM CDTSevere Thunderstorm WarningMPXPolk47 min
Aug 3, 8:42 PM CDTSevere Thunderstorm WarningMPXPolk48 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.