Alert archive / Montana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 33, NWS Great Falls, MT

June 28, 1997Chouteau County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 28, 1997, 8:20 PM MDT for Chouteau 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
Jun 28, 1997, 8:20 PM MDT (02:20 UTC)
Expired
Jun 28, 1997, 9:15 PM MDT
In force
55 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Chouteau County, MT

The radar

The Great Falls radar (KTFX), 85 km from the middle of the area, began a volume at 02:23 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, 2.3 hours before the alert went out and 48 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 1997-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 568 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 1997-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.1939Sfc1 km3 km6 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
568 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
2249 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
1 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 290220 RRA
SVRGTF
MTC015-290315-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
820 PM MDT SAT JUN 28 1997
 
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  915 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTH CENTRAL MONTANA
 
   ...NORTHERN CHOUTEAU COUNTY
 
RADAR INDICATES A LINE OF SEVERE THUNDERSTORMS SPREADING INTO NORTHERN
AND EASTERN CHOUTEAU COUNTY. THESE THUNDERSTORMS ARE MOVING TOWARDS THE
NORTHEAST AT 20 MPH. LARGE HAIL AND WIND GUSTS TO 60 MPH CAN BE EXPECTED
WITH THESE THUNDERSTORMS.
 
THE SEVERE THUNDERSTORM FOR SOUTHERN CHOUTEAU COUNTY HAS EXPIRED.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 6:30 PM MDTSevere Thunderstorm WarningTFXCascade60 min
Jun 28, 7:30 PM MDTSevere Thunderstorm WarningTFXChouteau45 min
Jun 28, 8:36 PM MDTSevere Thunderstorm WarningTFXTeton54 min
Jun 29, 2:53 PM MDTSevere Thunderstorm WarningTFXGallatin67 min
Jun 29, 3:30 PM MDTSevere Thunderstorm WarningTFXCascade, Meagher60 min
Jun 29, 4:39 PM MDTTornado WarningTFXJudith Basin36 min
Jun 29, 5:18 PM MDTSevere Thunderstorm WarningTFXFergus57 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.