Alert archive / Montana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 64, NWS Great Falls, MT

August 7, 1997Meagher County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 7, 1997, 6:57 PM MDT for Meagher County, Montana. It was in force for 63 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, 6:57 PM MDT (00:57 UTC)
Expired
Aug 7, 1997, 8:00 PM MDT
In force
63 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Meagher County, MT

The radar

The Great Falls radar (KTFX), 103 km from the middle of the area, began a volume at 00:59 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, 1.0 hours before the alert went out and 98 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, Great_falls, MT at 00:00Z on 1997-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 655 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 00:00Z on 1997-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.1939Sfc1 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
655 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
2423 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGTF 080058 RRA
SVRGTF
MTC059-080200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
657 PM MDT THU AUG 7 1997
 
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  800 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST MONTANA
 
   ...SOUTHWEST MEAGHER COUNTY
 
AT 655PM...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM IN SOUTHWEST
MEAGHER COUNTY. THIS STORM WAS MOVING TO THE NORTHEAST AT 25 MPH. LARGE
HAIL AND STRONG WINDS ARE LIKELY WITH THIS STORM.
 
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.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 6:09 PM MDTSevere Thunderstorm WarningTFXLiberty, Pondera, Toole66 min
Aug 7, 6:09 PM MDTSevere Thunderstorm WarningTFXTeton66 min
Aug 7, 6:42 PM MDTSevere Thunderstorm WarningTFXLewis and Clark63 min
Aug 7, 7:38 PM MDTSevere Thunderstorm WarningTFXTeton52 min
Aug 7, 9:00 PM MDTSevere Thunderstorm WarningTFXCascade60 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; radar from the NEXRAD Level II archive.