Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 14, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 16, 1997, 11:00 PM MDT for Powell County, Montana. It was in force for 30 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
- Jul 16, 1997, 11:00 PM MDT (05:00 UTC)
- Expired
- Jul 16, 1997, 11:30 PM MDT
- In force
- 30 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Powell County, MT
The radar
The Missoula radar (KMSX), 82 km from the middle of the area, began a volume at 05:04 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 00:00Z, 5.0 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3076 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 119 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 170506 RRA SVRMSO MTC077-170530- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 1100 PM MDT WED JUL 16 1997 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1130 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL MONTANA ...EAST CENTRAL POWELL COUNTY RADAR INDICATES A STRONG THUNDERSTORM WAS LOCATED 5 MILES SOUTHWEST OF AVON IN POWELL COUNTY. THIS STORM DOES CONTAIN THREE-QUARTER INCH SIZE HAIL. THIS STORM WILL BE IN THE VICINITY OF AVON BY 1115 PM MDT. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAV4Y RAIN... AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
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 Jul 16, 8:16 PM MDT, 2 hours 44 minutes earlier.
Area forecast discussion, Jul 16, 8:16 PM MDT, 2 hours 44 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 815 PM MDT WED JUL 16 1997 MSO GOES 9 SOUNDING AT 23Z SHOWS ETA MODEL A LITTLE TOO DRY AT MID AND UPPER LEVELS. SATELLITE INDICATES HIGH-LEVEL TROPICAL MOISTURE FROM ENRIQUE ADVANCING QUICKLY NORTHEASTWARD SPREADING OVER FORECAST AREA. ISOLATED HIGH-BASED TSTMS STILL POSSIBLE ESPECIALLY SOUTHERN MOUNTAINS AS INSTABILITY/GOOD THETA-E DIFFERENTIAL REMAINS OVERNIGHT. WILL REWORD FORECAST OVER SOUTHERN ZONES AS MID/UPPER CLOUDS INCREASE OVERNIGHT INTO THURSDAY. ALSO TEMPERATURES TOO LOW AS CLOUDS INCREASE AND WARM ADVECTION CONTINUES. REQUEST UPDATE. STOLL LIB .. 055/081 048/077 ... 330332 FCA WW 053/080 046/075 044 330333 POL .. 058/084 051/079 ... 330443 MSO WW 055/087 049/080 047 330453 HMM .. 053/089 047/083 ... 331453 BTM .. 051/087 045/075 ... 331343 S80 .. 056/081 053/076 ... 330452 P69 .. 058/086 056/081 ... 331553 SMN .. 056/087 053/082 ... 331243
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.