Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 261, NWS Twin Cities, MN

July 7, 1998Le Sueur County, Rice County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 7, 1998, 5:45 PM CDT for Le Sueur County, Rice County, Minnesota. It was in force for 45 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
Jul 7, 1998, 5:45 PM CDT (22:45 UTC)
Expired
Jul 7, 1998, 6:30 PM CDT
In force
45 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Le Sueur County, MN, Rice County, MN

The radar

The Minneapolis radar (KMPX), 54 km from the middle of the area, began a volume at 22:45 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.8 hours before the alert went out and 55 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 1998-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 695 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 12:00Z on 1998-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 square meters per square second.1939587897117Sfc1 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
695 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
687 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

046 
WUUS1 KMSP 072246 RRA
SVRMSP
MNC079-131-072330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
545 PM CDT TUE JUL 7 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN LE SUEUR COUNTY IN SOUTH CENTRAL MINNESOTA
  WESTERN RICE COUNTY IN EAST CENTRAL MINNESOTA

* UNTIL 630 PM CDT

* AT 545 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL NEAR HEIDELBERG...OR ABOUT 25 MILES NORTHWEST OF FARIBAULT.
  THE STORM WAS MOVING SOUTHEAST AT 25 MPH.

* SOME LOCATIONS AFFECTED
    MONTGOMERY
    HEIDELBERG
    SHIELDSVILLE
    KILKENNY

THIS IS A DANGEROUS STORM.  STAY INDOORS AWAY FROM WINDOWS.

JMP

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 3:27 PM CDTSevere Thunderstorm WarningMPXMeeker33 min
Jul 7, 4:38 PM CDTSevere Thunderstorm WarningMPXCarver, McLeod52 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.