Alert archive / Montana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 67, NWS Great Falls, MT

August 27, 1997Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 27, 1997, 5:00 PM MDT for Fergus County, Montana. It was in force for 30 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, 5:00 PM MDT (23:00 UTC)
Expired
Aug 27, 1997, 5:30 PM MDT
In force
30 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Fergus County, MT

The radar

The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 23:02 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 12:00Z, 11.0 hours before the alert went out and 106 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 12:00Z on 1997-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 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 12:00Z on 1997-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
47 J/kg
Mixed-layer CIN
-375 J/kg
Mixed-layer LCL
2100 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGTF 272305 RRA
SVRGTF
MTC027-272330-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
500 PM MDT WED AUG 27 1997
 
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 530 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL MONTANA
 
   ...NORTHERN FERGUS COUNTY
 
RADAR INDICATES A SEVERE THUNDERSTORM WEST OF WINIFRED IN NORTHERN
FERGUS COUNTY...MOVING TOWARDS THE NORTHEAST AT 15 MPH. WIND GUSTS TO 60
MPH...LARGE HAIL AND BRIEF HEAVY RAINS CAN BE EXPECTED WITH THIS
THUNDERSTORM.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 5:35 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin55 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.