Alert archive / Montana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 1, NWS Great Falls, MT

May 31, 1997Jefferson County, Madison County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at May 31, 1997, 4:45 PM MDT for Jefferson County, Madison County, Montana. It was in force for 60 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
May 31, 1997, 4:45 PM MDT (22:45 UTC)
Expired
May 31, 1997, 5:45 PM MDT
In force
60 min
Issued by
NWS Great Falls, MT
Area
Whole counties

Counties Jefferson County, MT, Madison County, MT

The radar

The Great Falls radar (KTFX), 199 km from the middle of the area, began a volume at 22:46 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 31, 4:15 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.8 hours before the alert went out and 221 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 1997-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1997-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2065 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
154 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 312243 RRA
SVRGTF
MTC043-057-312345-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
445 PM MDT SAT MAY 31 1997
 
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  545 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHWEST MONTANA
 
   ...SOUTHERN JEFFERSON COUNTY...NORTHERN MADISON COUNTY
 
AT 445 PM...A SEVERE THUNDERSTORM WAS OVER EAST CENTRAL BEAVERHEAD
COUNTY. THIS THUNDERSTORM WAS MOVING TOWARDS THE EAST TO NORTHEAST AT 30
MPH AND WILL MOVE INTO SOUTHERN JEFFERSON AND NORTHERN MADISON COUNTY BY
500 PM. HEAVY RAIN...DAMAGING HAIL AND STRONG GUSTY WINDS TO 60 MPH ARE 
KWITH THESE THUNDERSTORMS.
&

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.