Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 40, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 7, 1997, 3:00 PM MDT for Powell County, Montana. It was in force for 60 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, 3:00 PM MDT (21:00 UTC)
- Expired
- Aug 7, 1997, 4:00 PM MDT
- In force
- 60 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Powell County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 7, 3:45 PM MDT | Hail 1 | Helmville, 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, 9.0 hours before the alert went out and 189 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.
000 TTAA00 KMSO 072100 RRA SVRMSO MTC077-072200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 300 PM MDT THU AUG 7 1997 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 400 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL MONTANA ...POWELL COUNTY AT 300 PM MDT...MISSOULA RADAR INDICATE SEVERE THUNDERSTORMS MOVING THROUGH POWELL COUNTY. A SEVERE THUNDERSTORM WAS NEAR AVON IN SOUTHERN POWELL COUNTY WITH ANOTHER SEVERE THUNDERSTORM...5 MILES WEST-NORTHWEST OF OVANDO IN NORTHERN POWELL COUNTY. THESE STORMS ARE MOVING EAST AT 25 MPH. 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 DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. BELTZ/CLEMMONS
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.
NWS Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 7, 1:45 PM MDT, 1 hour 15 minutes earlier.
Area forecast discussion, Aug 7, 1:45 PM MDT, 1 hour 15 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 145 PM MDT THU AUG 7 1997 SFC FRONT STILL EXTENDS FROM EXTREME NORTHWEST MT TO SOUTHEAST WA. ISOLATED TSTMS IN PANHANDLE AND NORTHWEST MONTANA WITH FIRST WARNING JUST ISSUED FOR STORM NEAR FCA. BUILDUPS STILL OCCURRING AHEAD OF FRONT OVER CENTRAL ID/SOUTHWEST MT SO NOT OUT OF WOODS YET IN THESE AREAS SINCE FRONT/ASSOCIATED SHORTWAVE STILL YET TO PUSH EAST...WHICH SHOULD TRIGGER SCATTERED TSTMS IN THESE AREAS BY LATE AFTERNOON DUE TO VERY UNSTABLE ATMOSPHERE. BECOMING COOL AND DRY BEHIND FRONT BUT CHANNELED VORT WITH SOME MOISTURE WORKING THROUGH WEST MONTANA LATER FRIDAY INTO SATURDAY. DYNAMICS LACKING SO MAY ONLY MENTION ISOLATED SHOWERS OVER THE NORTHERN MOUNTAINS. BELTZ ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 047/074 045/073 ... 2710-1 FCA BB 049/075 046/073 046 2710-1 POL .. 053/077 051/075 ... 271001 MSO BB 052/080 048/078 048 27200- HMM .. 049/082 046/080 ... 272000 BTM .. 048/080 045/077 ... 273000 S80 .. 056/081 051/080 ... 271000 P69 .. 058/083 053/082 ... 272000 SMN .. 050/083 047/082 ... 272000
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 1:35 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 40 min |
| Aug 7, 2:00 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 60 min |
| Aug 7, 2:15 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 60 min |
| Aug 7, 2:20 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 55 min |
| Aug 7, 3:30 PM MDT | Severe Thunderstorm Warning | MSO | Beaverhead, Deer Lodge, Ravalli | 30 min |
| Aug 7, 3:55 PM MDT | Severe Thunderstorm Warning | MSO | Lake | 35 min |
| Aug 7, 4:00 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 45 min |
| Aug 7, 4:30 PM MDT | Severe Thunderstorm Warning | MSO | Flathead | 45 min |
| Aug 7, 4:43 PM MDT | Severe Thunderstorm Warning | MSO | Sanders | 47 min |
| Aug 7, 5:16 PM MDT | Severe Thunderstorm Warning | MSO | Beaverhead | 59 min |
| Aug 7, 5:35 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 55 min |
| Aug 7, 5:35 PM MDT | Severe Thunderstorm Warning | MSO | Lake | 55 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.