Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 5, NWS Great Falls, MT

June 23, 1998Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 23, 1998, 11:54 AM MDT for Fergus County, Montana. It was in force for 51 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 23, 1998, 11:54 AM MDT (17:54 UTC)
Expired
Jun 23, 1998, 12:45 PM MDT
In force
51 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Fergus County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 5.9 hours before the alert went out and 106 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, Great_falls, MT at 12:00Z on 1998-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 12:00Z on 1998-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1593 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
7 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.

583 
WUUS1 KGTF 231811 RRA
SVRGTF
MTC027-231855-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
1154 AM MDT TUE JUN 23 1998
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A
 
* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN FERGUS COUNTY IN CENTRAL MONTANA
 
* UNTIL 1245 PM MDT
 
* AT 1154 AM MDT... DOPPLER RADAR AT GREAT FALLS INDICATED A SEVERE
  THUNDERSTORM 37 MILES EAST OF LEWISTOWN OR 8 MILES SOUTHEAST OF   
GRASSRANGE MOVING NORTHEAST AT 25 MILES AN HOUR.
 
* THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS.

Nearby

Severe Thunderstorm Warnings in Montana, 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.