Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 280, NWS Twin Cities, MN

July 18, 1998Stevens County, Swift County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 1998, 10:03 PM CDT for Stevens County, Swift County, Minnesota. It was in force for 62 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 18, 1998, 10:03 PM CDT (03:03 UTC)
Expired
Jul 18, 1998, 11:05 PM CDT
In force
62 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Stevens County, MN, Swift County, MN

The radar

The Minneapolis radar (KMPX), 190 km from the middle of the area, began a volume at 03:04 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
Jul 18, 8:45 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.1 hours before the alert went out and 187 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 1998-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 16 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 1998-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -72 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
16 J/kg
Mixed-layer CIN
-548 J/kg
Mixed-layer LCL
2130 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
-72 m²/s²
0-3 km storm-relative helicity
450 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.

000 
TTAA00 KMSP 190306
SVRMSP
MNC149-151-190405-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1003 PM CDT SAT JUL 18 1998

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

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN STEVENS COUNTY IN WEST CENTRAL MINNESOTA
  SWIFT COUNTY IN WEST CENTRAL MINNESOTA

* UNTIL 1105 PM CDT

* AT 1000 PM CDT...DOPPLER RADAR INDICATED A SEVERE STORM 15 MILES
  NORTHEAST OF ORTONVILLE.  THE STORM WAS MOVING SOUTHEAST AT 35
  MPH.

* SOME LOCATIONS AFFECTED
    HOLLOWAY
    CLONTARF
    APPLETON
    RURAL AREAS SOUTH OF CHOKIO AND ALBERTA

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

A TORNADO WATCH IS IN EFFECT.  SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES.
CARLYON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 9:05 PM CDTTornado WarningMPXStevens60 min
Jul 18, 9:47 PM CDTSevere Thunderstorm WarningMPXRedwood33 min
Jul 18, 10:06 PM CDTSevere Thunderstorm WarningMPXBrown, Watonwan49 min
Jul 18, 11:09 PM CDTSevere Thunderstorm WarningMPXFaribault46 min
Jul 18, 11:25 PM CDTSevere Thunderstorm WarningMPXLe Sueur, Rice, Waseca50 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.