Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 15, NWS Twin Cities, MN

March 29, 1998Polk County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Mar 29, 1998, 3:49 PM CST for Polk County, Saint Croix County, Wisconsin. It was in force for 56 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: Mar 29, 1998, 3:49 PM CST (21:49 UTC)
Expired: Mar 29, 1998, 4:45 PM CST
In force: 56 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 21:51 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
Mar 29, 4:04 PM CST	Hail 0.75	Woodville, 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
Mar 29, 2:45 PM CST	Tornado Watch	SPC	6 hr
Mar 29, 3:15 PM CST	Severe Thunderstorm Watch	SPC	5 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 251 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.

726 
WUUS1 KMSP 292152 RRA
SVRMSP
WIC095-109-292250-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
349 PM CST SUN MAR 29 1998


* SEVERE THUNDERSTORM WARNING FOR
  POLK COUNTY - NORTHWESTERN WISCONSIN
  ST. CROIX COUNTY - WEST CENTRAL WISCONSIN

* UNTIL 445 PM CST

* SOME LOCATIONS AFFECTED
    NEW RICHMOND
    SOMERSET
    BALSAM LAKE
    AMERY

* AT 347 PM CST DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL NEAR STILLWATER...OR ABOUT 15 MILES EAST OF ST PAUL.  THE
  STORM WAS MOVING NORTHEAST AT 35 MPH.

THIS IS A DANGEROUS STORM...WITH LARGE HAIL.  STAY INDOORS AWAY
FROM WINDOWS.


MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 3:32 PM CST	Severe Thunderstorm Warning	MPX	Pierce	63 min
Mar 29, 4:09 PM CST	Severe Thunderstorm Warning	MPX	Dunn	46 min
Mar 29, 4:19 PM CST	Tornado Warning	MPX	Dunn	41 min
Mar 29, 4:43 PM CST	Severe Thunderstorm Warning	MPX	Barron, Chippewa, Rusk	62 min
Mar 29, 4:53 PM CST	Severe Thunderstorm Warning	MPX	Polk	37 min
Mar 29, 5:02 PM CST	Tornado Warning	MPX	Pepin	28 min
Mar 29, 5:28 PM CST	Tornado Warning	MPX	Dunn	47 min
Mar 29, 5:36 PM CST	Severe Thunderstorm Warning	MPX	Eau Claire	39 min
Mar 29, 5:55 PM CST	Severe Thunderstorm Warning	MPX	Chippewa	65 min
Mar 29, 5:58 PM CST	Severe Thunderstorm Warning	MPX	Dunn, Pepin, Pierce	47 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.