Alert archive / Montana / Tornado Warnings in 1991
Tornado Warning 3, NWS Great Falls, MT
NWS Great Falls, MT issued this tornado warning at Jun 25, 1991, 11:16 AM MDT for Cascade County, Chouteau County, Montana. It was in force for 29 min.
The area
The counties it named.
The facts
- Issued
- Jun 25, 1991, 11:16 AM MDT (17:16 UTC)
- Expired
- Jun 25, 1991, 11:45 AM MDT
- In force
- 29 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
Counties Cascade County, MT, Chouteau County, MT
The nearest sounding before it
Great Falls, MT (KGTF), launched 12:00Z, 5.3 hours before the alert went out and 33 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.
- Mixed-layer CAPE
- 25 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 832 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KGTF 251717 TORGTF MTC013-015-251745- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 1116 AM MDT TUE JUN 25 1991 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 1145 AM MDT FOR PEOPLE IN THE FOLLOWING LOCATION...S... IN NORTH CENTRAL MONTANA ...NORTHEASTERN CASCADE COUNTY...WESTERN CHOUTEAU COUNTY A FUNNEL CLOUD HAS BEEN REPORTED 10 MILES NE OF GREAT FALLS ALONG BOOT LEGGER TRAIL. THE STORM ASSOCIATED WITH THIS FUNNEL CLOUD IS MOVING NORTHEAST INTO WESTERN CHOTEAU COUNTY. 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 BASdEMENT 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.
What forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jun 25, 7:39 AM MDT, 3 hours 37 minutes before
MTZ006-251500- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 736 AM MDT TUE JUN 25 1991 ...STRONG THUNDERSTORM IN SOUTHEAST FERGUS COUNTY... BILLINGS RADAR AND SATELLITE PICTURES SHOW A STRONG THUNDERSTORM LOCATED IN SOUTHEAST FERGUS COUNTY MOVING RAPIDLY NORTHEAST AT ABOUT 40 MPH. THIS STORM WILL MOVE INTO PETROLEUM COUNTY BY AROUND 8 AM MDT. THE RADAR INDICATES POSSIBLE HAIL WITH THIS SYSTEM AND LOCALLY HEAVY RAINS ARE LgIKELY ALONG WITH BRIEF GUSTY WINDS. RESIDENTS IN SOUTHEAST FERGUS AND WESTERN PETROLEUM COUNTIES ARE URGED TO PAY CLOSE ATTENTION TO THIS STORM AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF ADVERSE CONDITIONS OCCUR. END...
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 3:31 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 59 min |
| Jun 25, 4:01 PM MDT | Tornado Warning | TFX | Cascade, Chouteau | 59 min |
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.