Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 81, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Sep 15, 1997, 2:42 PM MDT for Blaine County, Chouteau County, Hill County, Montana. It was in force for 63 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
- Sep 15, 1997, 2:42 PM MDT (20:42 UTC)
- Expired
- Sep 15, 1997, 3:45 PM MDT
- In force
- 63 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
Counties Blaine County, MT, Chouteau County, MT, Hill County, MT
The radar
The Great Falls radar (KTFX), 150 km from the middle of the area, began a volume at 20:44 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 nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 8.7 hours before the alert went out and 111 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
- 54 J/kg
- Mixed-layer CIN
- -492 J/kg
- Mixed-layer LCL
- 1231 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 181 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 152044 SVRGTF MTC005-015-041-152145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 242 PM MDT MON SEP 15 1997 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 345 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN NORTH CENTRAL MONTANA ...WESTERN BLAINE COUNTY...EASTERN CHOUTEAU COUNTY ...CENTRAL AND EASTERN HILL COUNTY DOPPLER RADAR INDICATES A SQUALL LINE MOVING TO THE NORTHEAST AT 40 MPH. WIND SPEEDS IN EXCESS OF 60 MPH HAVE BEEN REPORTED WITH THESE STORMS ALONG WITH HAIL AND BRIEF HEAVY RAIN. THE SQUALL LINE SHOULD REACH THE HAVRE AREA BETWEEN 3 AND 315 PM THIS AFTERNlOON. &
What forecasters said that day
The local office's own words before this severe thunderstorm 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, Sep 15, 1:26 PM MDT, 1 hour 16 minutes before
MTZ014-151930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 120 PM MDT MON SEP 15 1997 ...SEVERE THUNDERSTORM WARNING FOR SOUTHERN LEWIS AND CLARK COUNTY HAS BEEN ALLOWED TO EXPIRE... ...SEVERE THUNDERSTORM WARNING CONTINUES FOR NORTHERN CASCADE COUNTY UNTIL 145 PM MDT... THE SEVERE THUNDERSTORM THAT DEVELOPED OVER SOUTHERN LEWIS AND CLARK HAS DIMINISHED IN INTENSITY AND HAS MOVED EAST INTO NORTHERN BROADWATER COUNTY. REPORTS OF WIND GUSTS TO 60 MPH AND HAIL THREE-QUARTER INCH IN DIAMETER WERE REPORTED IN THE HELENA AREA. A SEVERE THUNDERSTORM OVER NORTHERN CASCADE COUNTY CONTINUES TO MOVE NORTHEAST AT 40 MPH. STRONG GUSTY WINDS IN EXCESS OF 55 MPH...HEAVY RAIN AND HAIL HAVE BEEN REPORTED WITH THIS STORM. & &
Special weather statement, Sep 15, 1:27 PM MDT, 1 hour 15 minutes before
MTZ014-151930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 120 PM MDT MON SEP 15 1997 ...SEVERE THUNDERSTORM WARNING FOR SOUTHERN LEWIS AND CLARK COUNTY HAS BEEN ALLOWED TO EXPIRE... ...SEVERE THUNDERSTORM WARNING CONTINUES FOR NORTHERN CASCADE COUNTY UNTIL 145 PM MDT... THE SEVERE THUNDERSTORM THAT DEVELOPED OVER SOUTHERN LEWIS AND CLARK HAS DIMINISHED IN INTENSITY AND HAS MOVED EAST INTO NORTHERN BROADWATER COUNTY. REPORTS OF WIND GUSTS TO 60 MPH AND HAIL THREE-QUARTER INCH IN DIAMETER WERE REPORTED IN THE HELENA AREA. A SEVERE THUNDERSTORM OVER NORTHERN CASCADE COUNTY CONTINUES TO MOVE NORTHEAST AT 40 MPH. STRONG GUSTY WINDS IN EXCESS OF 55 MPH...HEAVY RAIN AND HAIL HAVE BEEN REPORTED WITH THIS STORM. & &
Special weather statement, Sep 15, 2:07 PM MDT, 35 minutes before
MTZ012-013-152015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 203 PM MDT MON SEP 15 1997 ...SEVERE THUNDERSTORM WARNING FOR NORTHERN CASCADE COUNTY HAS EXPIRED... ...SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 230 PM MDT FOR EAST CENTR CASCADE COUNTY...SOUTHWESTERN CHOUTEAU COUNTY AND NORTHWESTERN JUDITH A COUNTY... THUNDERSTORMS ACROSS NORTHERN CASCADE COUNTY HAVE DIMINISHED IN INTENSIT ATHEY MOVE INTO CHOUTEAU COUNTY. AT 2PM MDT...AN AREA OF SEVERE THUNDERSTORMS CONTINUED TO MOVE TOWARD NO HAT 45 MPH ACROSS EAST CENTRAL CASCADE COUNTY. STRONG GUSTY WINDS IN EXCE OF 55 MPH ALONG WITH HAIL THREE-QUARTER INCH IN DIAMETER HAVE BEEN REPOR DWITH THESER STORMS. &
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 15, 11:46 AM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 44 min |
| Sep 15, 12:27 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 48 min |
| Sep 15, 12:36 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 54 min |
| Sep 15, 1:04 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 41 min |
| Sep 15, 1:42 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 63 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1997Every severe thunderstorm warning in 1997
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.