Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 58, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 26, 1997, 7:11 PM MDT for Powell County, Montana. It was in force for 64 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
- Aug 26, 1997, 7:11 PM MDT (01:11 UTC)
- Expired
- Aug 26, 1997, 8:15 PM MDT
- In force
- 64 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Powell County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 1.2 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
- 162 J/kg
- Mixed-layer CIN
- -230 J/kg
- Mixed-layer LCL
- 2725 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 149 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
302 WUUS1 KMSO 270118 RRA SVRMSO MTC077-270215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 711 PM MDT TUE AUG 26 1997 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 815 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL MONTANA ...POWELL COUNTY AT 715 PM MDT DOPPLER RADAR INDICATED STRONG THUNDERSTORMS APPROACHING THE TOWN OF HELMVILLE AND OVANDO IN POWELL COUNTY. THESE STORMS WILL LIKELY HAVE HAIL UP TO THREE QUARTER INCH IN DIAMETER AND HEAVY RAIN UP TO ONE INCH PER HOUR. THREE QUARTER INCH HAIL WAS REPORTED WITH A THUNDERTSTORM IN DEER LODGE. 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.
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 26, 1:53 PM MDT, 5 hours 18 minutes earlier.
Area forecast discussion, Aug 26, 1:53 PM MDT, 5 hours 18 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 145 PM MDT TUE AUG 26 1997 WEAK 700MB TROF MOVING INTO NORTHERN NEVADA...PUSHES THROUGH AREA TONIGHT. THIS IS BARELY SEEN ON SATELLITE WITH NOT MUCH DEVELOPMENT YET IN ITS VICINITY. SINCE MOISTURE APPEARS TO BE RATHER LIMITED AND DYNAMICS WEAK WILL ONLY MENTION ISOLATED TSTMS THIS EVENING. FRONT ALONG WEST COAST WEAKENS AS IT PROGRESSES EAST ON WEDNESDAY. ALL OF THE MODELS ARE TOO FAST WITH PUSHING THIS FEATURE THROUGH RIDGE. THUS EXPECT FRONT TO MOVE THROUGH AREA BY LATE WEDNESDAY MORNING...RATHER THAN OVERNIGHT. MOST OF THE MOISTURE IS RIDING NORTHWARD INTO CANADA AS SEEN ON SATELLITE SO EXPECT BEST CHANCES OF PRECIP TO BE IN THE NORTH SECTIONS ON WEDNESDAY. LINGERING MOISTURE/INSTABILITY BEHIND THE FRONT AS BROAD TROUGH HANGS ALONG THE WEST COAST WITH A SERIES OF SHORTWAVES PUSHING THROUGH AREA IN SOUTHWEST FLOW. PREFER LOW POPS AT THIS TIME SINCE NO STRONG FEATURE TO PRODUCE WIDESPREAD PRECIP AND NOT CONFIDENT ENOUGH TO GO ABOVE GUIDANCE WITH SCATTERED POPS. BELTZ ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 049/075 046/074 ... 272322 FCA BB 051/076 048/074 045 272322 POL .. 052/074 051/075 ... 272222 MSO BB 052/080 050/077 048 271222 HMM .. 047/082 048/078 ... 271222 BTM .. 045/079 045/076 ... 272222 S80 .. 051/076 048/075 ... 272222 P69 .. 056/080 053/078 ... 272222 SMN .. 045/079 045/077 ... 271111
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 8:00 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite | 45 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.