Alert archive / Montana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 69, NWS Great Falls, MT

August 27, 1997Judith Basin County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 27, 1997, 6:56 PM MDT for Judith Basin 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 27, 1997, 6:56 PM MDT (00:56 UTC)
Expired
Aug 27, 1997, 8:00 PM MDT
In force
64 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Judith Basin County, MT

The radar

The Great Falls radar (KTFX), 96 km from the middle of the area, began a volume at 00:56 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, 0.9 hours before the alert went out and 52 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 1997-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 16 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 1997-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 square meters per square second.19395878Sfc1 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
16 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
3443 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
126 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.

178 
WUUS1 KGTF 280059 RRA
SVRGTF
MTC045-280200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
656 PM MDT WED AUG 27 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 CENTRAL MONTANA
 
   ...CENTRAL JUDITH BASIN COUNTY
 
AT 655 PM...DOPPLER RADAR INDICATED TWO SEVERE THUNDERSTORMS IN CENTRAL
JUDITH BASIN COUNTY. THESE STORMS WERE MOVING TO THE NORTHEAST AT 30
MPH. BRIEF HEAVY RAIN...FREQUENT LIGHTNING...AND LARGE HAIL CAN BE
EXPECTED WITH THESE STORMS.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 8:43 PM MDTSevere Thunderstorm WarningTFXHill47 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.