Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 309, NWS Twin Cities, MN

August 23, 1998Lac qui Parle County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 23, 1998, 3:15 AM CDT for Lac qui Parle County, Minnesota. It was in force for 45 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, 3:15 AM CDT (08:15 UTC)
Expired
Aug 23, 1998, 4:00 AM CDT
In force
45 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Lac qui Parle County, MN

The radar

The Sioux Falls radar (KFSD), 163 km from the middle of the area, began a volume at 08:17 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

TimeReportWhereRemark
Aug 23, 3:54 AM CDTThunderstorm Wind 50Madison, 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

Aberdeen, SD (KABR), launched 00:00Z, 8.3 hours before the alert went out and 176 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, Aberdeen, SD at 00:00Z on 1998-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1593 joules per kilogram.LCLLFCEL10008507005003002001001 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, Aberdeen, SD at 00:00Z on 1998-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.1939587897Sfc1 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
1593 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
1507 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.0

Open this sounding in Storm Lab

The text

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

647 
WUUS1 KMSP 230817 RRA
SVRMSP
MNC073-230900-

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

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

* SEVERE THUNDERSTORM WARNING FOR...
  LAC QUI PARLE COUNTY IN WEST CENTRAL MINNESOTA

* UNTIL 400 AM CDT

* AT 315 AM CDT...DOPPLER RADAR INDICATED A SEVERE STORM WITH
  DAMAGING WINDS OVER EXTREME EASTERN SOUTH DAKOTA...OR ABOUT 40
  MILES WEST OF MONTEVIDEO.  THE STORM WAS MOVING EAST AT 50
  MPH.

* SOME LOCATIONS AFFECTED
    ROSEN
    MARIETTA
    BELLINGHAM
    MADISON
    PROVIDENCE

THIS IS A DANGEROUS STORM...WITH DAMAGING WINDS.  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, 3:33 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, 4:14 AM CDTSevere Thunderstorm WarningMPXChippewa, Swift16 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; radar from the NEXRAD Level II archive.