Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 57, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 7, 1997, 1:41 PM MDT for Cascade County, Montana. It was in force for 49 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 7, 1997, 1:41 PM MDT (19:41 UTC)
- Expired
- Aug 7, 1997, 2:30 PM MDT
- In force
- 49 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Cascade County, MT
The radar
The Great Falls radar (KTFX), 17 km from the middle of the area, began a volume at 19:42 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 7, 1:55 PM MDT | Hail 0.75 | Great Falls, MT |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 7.7 hours before the alert went out and 59 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
- 151 J/kg
- Mixed-layer CIN
- -192 J/kg
- Mixed-layer LCL
- 2429 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
235 WUUS1 KGTF 071942 RRA SVRGTF MTC013-072030- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 141 PM MDT THU AUG 7 1997 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 230 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTH MONTANA ...CENTRAL CASCADE COUNTY AT 135 PM RADAR INDICATED A SEVERE THUNDERSTORM JUST SOUTHWEST OF GREAT FALLS. THIS STORM IS MOVING TO THE EAST AT 25 MPH. THIS STORM WILL BE MOVING INTO THROUGH THE TOWNS OF TRACY...STOCKETT AND CENTERVILLE DURING THE NEXT HALF HOUR. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DONT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 4:09 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 36 min |
| Aug 7, 4:34 PM MDT | Severe Thunderstorm Warning | TFX | Pondera | 56 min |
| Aug 7, 4:46 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 59 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.