Alert archive / Montana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 39, NWS Missoula, MT

August 7, 1997Missoula County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Aug 7, 1997, 2:20 PM MDT for Missoula County, Montana. It was in force for 55 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 7, 1997, 2:20 PM MDT (20:20 UTC)
Expired
Aug 7, 1997, 3:15 PM MDT
In force
55 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Missoula County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 8.3 hours before the alert went out and 201 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.

Skew-T log-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 1997-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 45 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 1997-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
45 J/kg
Mixed-layer CIN
-382 J/kg
Mixed-layer LCL
1987 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMSO 072020 RRA
SVRMSO
MTC063-072115-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
220 PM MDT THU AUG 7 1997
 
THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  315 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN WEST CENTRAL MONTANA
 
   ...EASTERN MISSOULA COUNTY
 
AT 220 PM MDT...MISSOULA DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS EXTENDING FROM 5 MILES WEST OF SEELEY LAKE TO JUST
EAST OF LOLO. THIS LINE OF STORMS IS MOVING EAST AT 25 MPH AND
WILL AFFECT THE TOWNS OF SEELEY LAKE...MILLTOWN AND CLINTON.
 
THIS SEVERE THUNDERSTORM WARNING REPLACES THE SEVERE THUNDERSTORM
WARNING ISSUED EARLIER FOR NORTH CENTRAL MISSOULA COUNTY.
 
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

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 7, 1:35 PM MDTSevere Thunderstorm WarningMSOFlathead40 min
Aug 7, 2:00 PM MDTSevere Thunderstorm WarningMSOMissoula60 min
Aug 7, 2:15 PM MDTSevere Thunderstorm WarningMSOFlathead60 min
Aug 7, 3:00 PM MDTSevere Thunderstorm WarningMSOPowell60 min
Aug 7, 3:30 PM MDTSevere Thunderstorm WarningMSOBeaverhead, Deer Lodge, Ravalli30 min
Aug 7, 3:55 PM MDTSevere Thunderstorm WarningMSOLake35 min
Aug 7, 4:00 PM MDTSevere Thunderstorm WarningMSOPowell45 min
Aug 7, 4:30 PM MDTSevere Thunderstorm WarningMSOFlathead45 min
Aug 7, 4:43 PM MDTSevere Thunderstorm WarningMSOSanders47 min
Aug 7, 5:16 PM MDTSevere Thunderstorm WarningMSOBeaverhead59 min
Aug 7, 5:35 PM MDTSevere Thunderstorm WarningMSOGranite, Missoula, Powell55 min
Aug 7, 5:35 PM MDTSevere Thunderstorm WarningMSOLake55 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.