Alert archive / Montana / Tornado Warnings in 1991

Tornado Warning 1, NWS Missoula, MT

June 21, 1991Meagher County, Montana

NWS Missoula, MT issued this tornado warning at Jun 21, 1991, 5:23 PM MDT for Meagher County, Montana. It was in force for 67 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1991, 5:23 PM MDT (23:23 UTC)
Expired
Jun 21, 1991, 6:30 PM MDT
In force
67 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Meagher County, MT

The nearest sounding before it

Great Falls, MT (KGTF), launched 12:00Z, 11.4 hours before the alert went out and 103 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 1991-06-21Temperature 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 km15 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 1991-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1217 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
59 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 KHLN 212325
TORHLN
MTC059-220030-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HELENA MT
523 PM MDT FRI JUN 21 1991
 
THE NATIONAL WEATHER SERVICE IN HELENA MT     HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  630 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST MONTANA
 
   ...EASTERN MEAGHER COUNTY
 
AT 5:18 PM MDT...THE MEAGHER COUNTY SHERIFF S OFFICE REPORTED
FUNNEL CLOUDS NEAR THE TOWN OF RINGLING MONTANA WHICH IS SOUTH
OF WHITE SULPHUR SPRINGS MONTANA ON US HIGHWAY 89.
 
THE FUNNEL CLOUDS ARE ASSOCIATED WITH AN INTENSE THUNDERSTORM AS
INDICATED BY NATIONAL WEATHER SERVICE RADAR TO BE LOCATED IN THAT
AREA. THE THUNDERSTORM WAS MOVING NORTHEAST AT 30 MILES AN HOUR.
 
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR MEAGHER AND
GALLATIN COUNTIES OF SOUTHEST MONTANA UNTIL 9 PM MDT THIS
FRIDAY EVENING.
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENxCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
MHOON

Nearby

Tornado Warnings in Montana, 1991Every tornado warning in 1991Tornadoes in 1991

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.