Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 74, NWS Twin Cities, MN

May 18, 1998Nicollet County, Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 18, 1998, 7:27 PM CDT for Nicollet County, Sibley County, Minnesota. It was in force for 63 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 18, 1998, 7:27 PM CDT (00:27 UTC)
Expired
May 18, 1998, 8:30 PM CDT
In force
63 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Nicollet County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 68 km from the middle of the area, began a volume at 00:28 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.

IssuedProductOfficeLasted
May 18, 4:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.5 hours before the alert went out and 66 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 1998-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3617 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, Minneapolis, MN at 00:00Z on 1998-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.1939Sfc1 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
3617 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
1794 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
55 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.

539 
WUUS1 KMSP 190027 RRA
SVRMSP
MNC019-103-143-190130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
727 PM CDT MON MAY 18 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  CARVER COUNTY IN EAST CENTRAL MINNESOTA
  NICOLLET COUNTY IN SOUTH CENTRAL MINNESOTA
  SIBLEY COUNTY IN SOUTH CENTRAL MINNESOTA

* UNTIL 830 PM CDT

* AT 725 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE STORMS
  FROM LITCHFIELD TO MORGAN 25 MILES NORTHWEST OF NEW ULM.  THE
  STORMS WERE MOVING EAST AT 35 MPH.

* SOME LOCATIONS AFFECTED
    GIBBON
    ST GEORGE
    WINTHROP
    LAFAYETTE
    KLOSSNER
    WACONIA
    COLOGNE

DAMAGING WINDS UP TO 60 MPH AND LARGE HAIL UP TO GOLF BALL SIZE ARE
LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

JMP

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 7:00 PM CDTSevere Thunderstorm WarningMPXChippewa, Renville, Yellow Medicine60 min
May 18, 7:08 PM CDTSevere Thunderstorm WarningMPXMcLeod47 min
May 18, 7:27 PM CDTSevere Thunderstorm WarningMPXCarver63 min
May 18, 7:37 PM CDTSevere Thunderstorm WarningMPXHennepin, Wright53 min
May 18, 7:55 PM CDTSevere Thunderstorm WarningMPXMcLeod65 min
May 18, 7:58 PM CDTTornado WarningMPXMcLeod62 min
May 18, 8:04 PM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Ramsey, Scott, Washington61 min
May 18, 8:21 PM CDTSevere Thunderstorm WarningMPXMorrison, Stearns64 min
May 18, 8:38 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Meeker42 min
May 18, 8:49 PM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Scott61 min
May 18, 8:49 PM CDTSevere Thunderstorm WarningMPXCarver61 min
May 18, 8:57 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, Nicollet63 min
May 18, 9:26 PM CDTSevere Thunderstorm WarningMPXBenton, Sherburne, Stearns64 min
May 18, 9:34 PM CDTSevere Thunderstorm WarningMPXGoodhue, Rice66 min
May 18, 9:55 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Nicollet40 min
May 18, 10:45 PM CDTSevere Thunderstorm WarningMPXWaseca30 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.