Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 33, NWS Twin Cities, MN

May 12, 1998Polk County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at May 12, 1998, 2:41 PM CDT for Polk County, Saint Croix County, Wisconsin. It was in force for 34 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: May 12, 1998, 2:41 PM CDT (19:41 UTC)
Expired: May 12, 1998, 3:15 PM CDT
In force: 34 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 98 km from the middle of the area, began a volume at 19:42 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
May 12, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 7.7 hours before the alert went out and 101 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 913 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 252 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.

685 
WUUS1 KMSP 121943 RRA
SVRMSP
WIC095-109-122015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
241 PM CDT TUE MAY 12 1998

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES/CHANHASSEN HAS
ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  POLK COUNTY IN NORTHWESTERN WISCONSIN
  EXTREME NORTHERN ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN

* UNTIL 315 PM CDT

* AT 241 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL AND DAMAGING WINDS NEAR NEW RICHMOND.  THE STORM WAS MOVING
  NORTHEAST AT 40 MPH.

* SOME LOCATIONS AFFECTED
    STAR PRAIRIE
    LITTLE FALLS
    AMERY

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


MCBEATH-PETERS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 3:14 PM CDT	Severe Thunderstorm Warning	MPX	Polk	36 min
May 12, 4:10 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire, Pepin	35 min
May 12, 4:28 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn	32 min
May 12, 4:42 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	18 min
May 12, 5:02 PM CDT	Tornado Warning	MPX	Barron	28 min
May 12, 5:04 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	46 min
May 12, 5:20 PM CDT	Tornado Warning	MPX	Rusk	30 min
May 12, 5:49 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	31 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1998 Every severe thunderstorm warning in 1998

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.