Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 37, NWS Twin Cities, MN

May 12, 1998Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at May 12, 1998, 4:42 PM CDT for Eau Claire County, Wisconsin. It was in force for 18 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, 4:42 PM CDT (21:42 UTC)
Expired
May 12, 1998, 5:00 PM CDT
In force
18 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Eau Claire County, WI

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 12, 4:00 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.7 hours before the alert went out and 183 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 1998-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 1998-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 231 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

000 
TTAA00 KMSP 122144
SVRMSP
WIC035-122200-

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

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

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN

* UNTIL 500 PM CDT

* AT 445 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM JUST WEST
  OF EAU CLAIRE.  THE STORM WAS MOVING NORTHEAST AT 35 MPH.

* SOME LOCATIONS AFFECTED
    EAU CLAIRE
    ALTOONA

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

MCBEATH-PETERS

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 2:41 PM CDTSevere Thunderstorm WarningMPXPolk, Saint Croix34 min
May 12, 3:14 PM CDTSevere Thunderstorm WarningMPXPolk36 min
May 12, 4:10 PM CDTSevere Thunderstorm WarningMPXEau Claire, Pepin35 min
May 12, 4:28 PM CDTSevere Thunderstorm WarningMPXChippewa, Dunn32 min
May 12, 5:02 PM CDTTornado WarningMPXBarron28 min
May 12, 5:04 PM CDTSevere Thunderstorm WarningMPXChippewa46 min
May 12, 5:20 PM CDTTornado WarningMPXRusk30 min
May 12, 5:49 PM CDTSevere Thunderstorm WarningMPXChippewa31 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1998Every 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.