Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 218, NWS Twin Cities, MN

September 1, 1997Barron County, Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 1, 1997, 5:09 PM CDT for Barron County, Polk County, Wisconsin. It was in force for 66 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: Sep 1, 1997, 5:09 PM CDT (22:09 UTC)
Expired: Sep 1, 1997, 6:15 PM CDT
In force: 66 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Barron County, WI, Polk County, WI

The radar

The Minneapolis radar (KMPX), 130 km from the middle of the area, began a volume at 22:09 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
Sep 1, 5:15 PM CDT	Hail 1.75	Almena, 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
Sep 1, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.2 hours before the alert went out and 132 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: 751 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 739 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 012209 RRA
SVRMSP
WIC005-095-012315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
509 PM CDT MON SEP 1 1997


* SEVERE THUNDERSTORM WARNING FOR
  BARRON COUNTY - NORTHWESTERN WISCONSIN
  POLK COUNTY - NORTHWESTERN WISCONSIN

* UNTIL 615 PM CDT

* SOME LOCATIONS AFFECTED
    TURTLE LAKE
    LAKE ALMENA
    CLAYTON
    CLAM FALLS

* AT 507 PM CDT DOPPLER RADAR INDICATED SEVERE STORMS IN EAST
  CENTRAL AND NORTH CENTRAL POLK COUNTY...OR FROM 30 MILES
  NORTHWEST OF RICE LAKE TO 25 MILES SOUTHWEST OF RICE LAKE.  THE
  STORMS WERE MOVING SOUTHEAST AT 25 MPH.

THESE ARE DANGEROUS STORMS.  STAY INDOORS AWAY FROM WINDOWS.


HAMEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 1, 4:22 PM CDT	Severe Thunderstorm Warning	MPX	Rusk	53 min
Sep 1, 5:12 PM CDT	Severe Thunderstorm Warning	MPX	Rusk	48 min
Sep 1, 6:57 PM CDT	Severe Thunderstorm Warning	MPX	Pepin	33 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.