Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 313, NWS Twin Cities, MN

August 23, 1998Chippewa County, Swift County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 23, 1998, 4:14 AM CDT for Chippewa County, Swift County, Minnesota. It was in force for 16 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
Aug 23, 1998, 4:14 AM CDT (09:14 UTC)
Expired
Aug 23, 1998, 4:30 AM CDT
In force
16 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Chippewa County, MN, Swift County, MN

What was reported inside it

TimeReportWhereRemark
Aug 23, 4:15 AM CDTThunderstorm Wind 50Clara City, MNPower lines down. Estimated windspeed.

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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 9.2 hours before the alert went out and 163 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 00:00Z on 1998-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2973 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1998-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 255 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
2973 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
823 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
255 m²/s²
0-3 km storm-relative helicity
351 m²/s²
Significant tornado parameter
4.3
Supercell composite
21.4

Open this sounding in Storm Lab

The text

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

958 
WUUS1 KMSP 230917 RRA
SVRMSP
MNC023-151-230930-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
414 AM CDT SUN AUG 23 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA
  EASTERN SWIFT COUNTY IN WEST CENTRAL MINNESOTA

* UNTIL 430 AM CDT

* AT 415 AM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE STORMS
  FROM BENSON TO MONTEVIDEO.  THE STORMS WERE MOVING EAST AT 50 MPH.

* SOME LOCATIONS AFFECTED
    CLARA CITY
    KERKHOVEN
    DE GRAFF
    BENSON

THESE ARE DANGEROUS STORMS WITH A HISTORY OF PRODUCING WIND GUSTS
NEAR 70 MPH.  STAY INDOORS AWAY FROM WINDOWS.

JJ

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 7:30 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin65 min
Aug 22, 7:57 PM CDTSevere Thunderstorm WarningMPXDakota, Scott63 min
Aug 22, 8:10 PM CDTTornado WarningMPXDakota, Scott30 min
Aug 22, 8:35 PM CDTSevere Thunderstorm WarningMPXHennepin, Ramsey, Washington45 min
Aug 22, 8:35 PM CDTSevere Thunderstorm WarningMPXCarver45 min
Aug 22, 8:40 PM CDTTornado WarningMPXDakota65 min
Aug 22, 9:14 PM CDTFlash Flood WarningMPXCarver, Dakota, Hennepin, Scott2 hr
Aug 22, 9:19 PM CDTSevere Thunderstorm WarningMPXGoodhue51 min
Aug 22, 9:27 PM CDTSevere Thunderstorm WarningMPXDakota, Scott63 min
Aug 22, 9:51 PM CDTFlash Flood WarningMPXScott69 min
Aug 23, 3:15 AM CDTSevere Thunderstorm WarningMPXLac qui Parle45 min
Aug 23, 3:33 AM CDTSevere Thunderstorm WarningMPXChippewa, Swift42 min
Aug 23, 4:07 AM CDTSevere Thunderstorm WarningMPXKandiyohi58 min
Aug 23, 4:10 AM CDTSevere Thunderstorm WarningMPXYellow Medicine35 min
Aug 23, 4:40 AM CDTSevere Thunderstorm WarningMPXMeeker60 min
Aug 23, 5:02 AM CDTSevere Thunderstorm WarningMPXWright43 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.