Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 99, NWS Twin Cities, MN

July 1, 1997Barron County, Dunn County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 1997, 9:10 PM CDT for Barron County, Dunn County, Wisconsin. It was in force for 50 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: Jul 1, 1997, 9:10 PM CDT (02:10 UTC)
Expired: Jul 1, 1997, 10:00 PM CDT
In force: 50 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Barron County, WI, Dunn County, WI

The radar

The Minneapolis radar (KMPX), 138 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.

What was reported inside it

Time	Report	Where	Remark
Jul 1, 9:35 PM CDT	Thunderstorm Wind 61	Turtle Lake, 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 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, 2.2 hours before the alert went out and 141 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 020212 RRA
SVRMSP
WIC005-033-020300-

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

* SEVERE THUNDERSTORM WARNING FOR
  BARRON COUNTY - NORTHWESTERN WISCONSIN
  DUNN COUNTY - WEST CENTRAL WISCONSIN

* UNTIL 1000 PM CDT
 
* SOME LOCATIONS AFFECTED
    CUMBERLAND
    BARRON
    BOYCEVILLE
    MENOMONIE

* AT 909 PM CDT DOPPLER RADAR INDICATED A LINE OF SEVERE STORMS
  FROM NEAR BALSAM LAKE TO BALDWIN.  THE STORMS WERE MOVING MOVING
  EAST AT 40 MPH.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY.  GO INSIDE A STURDY
BUILDING AND STAY 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, 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
Jul 1, 11:33 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	27 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.