Alert archive / Montana / Tornado Warnings in 1991

Tornado Warning 2, NWS Great Falls, MT

June 24, 1991Cascade County, Montana

NWS Great Falls, MT issued this tornado warning at Jun 24, 1991, 3:02 PM MDT for Cascade County, Montana. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Jun 24, 1991, 3:02 PM MDT (21:02 UTC)
Expired
Jun 24, 1991, 4:00 PM MDT
In force
58 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Cascade County, MT

The nearest sounding before it

Great Falls, MT (KGTF), launched 12:00Z, 9.0 hours before the alert went out and 19 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 1991-06-24Temperature 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 1991-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1747 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
49 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 KGTF 242102
TORGTF
MTC013-242200-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
302 PM MDT MON JUN 24 1991
 
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  400 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN NORTH CENTRAL MONTANA
 
   ...NORTHERN CASCADE COUNTY INCLUDING THE CITY OF GREAT FALLS.
 
FUNNEL CLOUDS ARE BEING OBSERVED JUST NORTH OF THE CITY OF GREAT
FALLS. SO FAR THERE HAVE BEEN NO REPORTS OF THEM TOUCHING DOWN...BUT
THEY COULD AND SHOULD BE CONSIDERED DANGEROUS. THE THUNDERSTORM WHICH
IS PRODUCING THESE FUNNELS IS MOVING NORTHEAST AT 25 MPH.
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH 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.
 K

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.