Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 172, NWS Twin Cities, MN

June 20, 1998Scott County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 20, 1998, 9:35 AM CDT for Scott County, Minnesota. It was in force for 40 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
Jun 20, 1998, 9:35 AM CDT (14:35 UTC)
Expired
Jun 20, 1998, 10:15 AM CDT
In force
40 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Scott County, MN

The radar

The Minneapolis radar (KMPX), 22 km from the middle of the area, began a volume at 14:37 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
Jun 20, 9:15 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 2.6 hours before the alert went out and 23 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 1998-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 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 1998-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 416 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
18 J/kg
Mixed-layer CIN
-384 J/kg
Mixed-layer LCL
2049 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
416 m²/s²
0-3 km storm-relative helicity
589 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

871 
WUUS1 KMSP 201433 RRA
SVRMSP
MNC139-201515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
935 AM CDT SAT JUN 20 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  SCOTT COUNTY IN EAST CENTRAL MINNESOTA

* UNTIL 1015 AM CDT

* AT 935AM CDT...DOPPLER RADAR INDICATED A SEVERE STORM 10 MILES
  WEST OF BELLE PLAINE.  THE STORM WAS MOVING EAST AT 35 MPH.

* SOME LOCATIONS AFFECTED
    BELLE PLAINE
    ST. BENEDICT
    JORDAN
    ST. PATRICK

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

CME

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 8:34 AM CDTSevere Thunderstorm WarningMPXMartin61 min
Jun 20, 8:40 AM CDTSevere Thunderstorm WarningMPXBrown, Watonwan65 min
Jun 20, 9:14 AM CDTSevere Thunderstorm WarningMPXNicollet, Sibley61 min
Jun 20, 9:31 AM CDTSevere Thunderstorm WarningMPXMartin64 min
Jun 20, 9:54 AM CDTSevere Thunderstorm WarningMPXWatonwan36 min
Jun 20, 10:25 AM CDTSevere Thunderstorm WarningMPXWatonwan35 min
Jun 20, 11:19 AM CDTSevere Thunderstorm WarningMPXFaribault, Martin46 min
Jun 20, 12:00 PM CDTSevere Thunderstorm WarningMPXFaribault65 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.