Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 105, NWS Twin Cities, MN

July 1, 1997Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 1997, 11:33 PM CDT for Eau Claire County, Wisconsin. It was in force for 27 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: Jul 1, 1997, 11:33 PM CDT (04:33 UTC)
Expired: Jul 2, 1997, 12:00 AM CDT
In force: 27 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Eau Claire County, WI

The radar

The La Crosse radar (KARX), 101 km from the middle of the area, began a volume at 04:35 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.

Issued	Product	Office	Lasted
Jul 1, 7:45 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.6 hours before the alert went out and 183 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: 1759 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1186 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 303 m²/s²
0-3 km storm-relative helicity: 455 m²/s²
Significant tornado parameter: 4.3
Supercell composite: 21.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 020434 RRA
SVRMSP
WIC035-020500-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1133 PM CDT TUE JUL 1 1997

* SEVERE THUNDERSTORM WARNING FOR
  EASTERN EAU CLAIRE COUNTY - WEST CENTRAL WISCONSIN

* UNTIL 1200 AM CDT
 
* SOME LOCATIONS AFFECTED
    AUGUSTA
    FAIRCHILD
    LUDINGTON

* AT 1132 PM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH
  DAMAGING WINDS 15 MILES EAST-SOUTHEAST OF EAU CLAIRE.  THE STORM
  WAS MOVING EAST AT 20 MPH.

THIS IS A DANGEROUS STORM...WITH DAMAGING WINDS.  STAY INDOORS AWAY
FROM WINDOWS.

A TORNADO WATCH IS IN EFFECT.  SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES.

HOWIESON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 8:25 PM CDT	Severe Thunderstorm Warning	MPX	Polk, Saint Croix	65 min
Jul 1, 8:48 PM CDT	Severe Thunderstorm Warning	MPX	Pierce	57 min
Jul 1, 9:10 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn	50 min
Jul 1, 10:14 PM CDT	Severe Thunderstorm Warning	MPX	Pepin, Pierce	46 min
Jul 1, 10:38 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Eau Claire	52 min
Jul 1, 10:55 PM CDT	Severe Thunderstorm Warning	MPX	Pepin, Pierce	35 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.