Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 55, NWS Twin Cities, MN

May 15, 1998Polk County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at May 15, 1998, 4:47 PM CDT for Polk County, Saint Croix County, Wisconsin. It was in force for 58 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 15, 1998, 4:47 PM CDT (21:47 UTC)
Expired: May 15, 1998, 5:45 PM CDT
In force: 58 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 21:48 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 15, 4:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.8 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: 1571 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 642 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.5

Open this sounding in Storm Lab

The text

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

925 
WUUS1 KMSP 152148 RRA
SVRMSP
MNC009-025-059-095-WIC095-109-152245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
447 PM CDT FRI MAY 15 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  BENTON COUNTY IN CENTRAL MINNESOTA
  CHISAGO COUNTY IN EAST CENTRAL MINNESOTA
  ISANTI COUNTY IN EAST CENTRAL MINNESOTA
  MILLE LACS COUNTY IN CENTRAL MINNESOTA
  POLK COUNTY IN NORTHWESTERN WISCONSIN
  ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN

* UNTIL 545 PM CDT

* AT 445 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE STORMS 20
  MILES SOUTHWEST OF ST CLOUD TO 30 MILES SOUTHWEST OF RED WING.
  THE STORMS WERE MOVING NORTH AT 70 MPH.

* SOME LOCATIONS AFFECTED
    HUDSON
    AMERY
    BALSAM LAKE
    CENTER CITY
    CAMBRIDGE
    MILACA
    FOLEY

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.
JMP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 5:37 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Pepin, Pierce, Saint Croix	58 min
May 15, 5:37 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk	58 min
May 15, 6:28 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Eau Claire	32 min
May 15, 6:28 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Rusk	62 min
May 15, 6:28 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	62 min
May 15, 6:43 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn	32 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.