Alert archive / Montana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 65, NWS Great Falls, MT

August 7, 1997Teton County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 7, 1997, 7:38 PM MDT for Teton County, Montana. It was in force for 52 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, 7:38 PM MDT (01:38 UTC)
Expired
Aug 7, 1997, 8:30 PM MDT
In force
52 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Teton County, MT

The radar

The Great Falls radar (KTFX), 77 km from the middle of the area, began a volume at 01:38 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, 1.6 hours before the alert went out and 130 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 080140 RRA
SVRGTF
MTC099-080230-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
738 PM MDT THU AUG 7 1997
 
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  830 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTH MONTANA
 
   ...SOUTHEASTERN TETON COUNTY
 
RADAR INDICATES A SEVERE THUNDERSTORM NEAR FAIRFIELD...MOVING EAST AT 35
MPH. STRONG WINDS AND LARGE HAIL ARE LIKELY.
 
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTO&RISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

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, 6:57 PM MDTSevere Thunderstorm WarningTFXMeagher63 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.