Alert archive / Montana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 37, NWS Great Falls, MT

June 29, 1997Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 29, 1997, 5:18 PM MDT for Fergus County, Montana. It was in force for 57 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 29, 1997, 5:18 PM MDT (23:18 UTC)
Expired: Jun 29, 1997, 6:15 PM MDT
In force: 57 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 23:19 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.

Issued	Product	Office	Lasted
Jun 29, 2:30 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.3 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 55 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 292318 RRA
SVRGTF
MTC027-300015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
518 PM MDT SUN JUN 29 1997
 
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  615 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL MONTANA
 
   ...FERGUS COUNTY
 
AT 515 PM...RADAR INDICATED SEVERE THUNDERSTORMS OVER FERGUS COUNTY. ONE
STORM WAS 15 MILES SOUTHWEST OF LEWISTOWN NEAR MOORE. THIS STORM HAS
PRODUCED GOLF BALL SIZE HAIL AT HOBSON. THIS STORM WILL BE IN THE
LEWISTOWN AREA BY 545 PM.
 
ANOTHER SEVERE THUNDERSTORM WAS 40 MILES NORTHEAST OF LEWISTOWN IN
NORTHEASTERN FERGUS COUNTY.  THIS STORM WILL BE MOVING INTO SOUTHERN
PHILLIPS COUNTY OVER THE NEXT HOUR.
 
THESE STORMS WILL LIKELY PRODUCE VERY HEAVY RAIN...LARGE HAIL AND STRONG
GUSTY WINDS.
 
 
 
&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 6:30 PM MDT	Severe Thunderstorm Warning	TFX	Cascade	60 min
Jun 28, 7:30 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	45 min
Jun 28, 8:20 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	55 min
Jun 28, 8:36 PM MDT	Severe Thunderstorm Warning	TFX	Teton	54 min
Jun 29, 2:53 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	67 min
Jun 29, 3:30 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Meagher	60 min
Jun 29, 4:39 PM MDT	Tornado Warning	TFX	Judith Basin	36 min

Nearby

Severe Thunderstorm Warnings in Montana, 1997 Every 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.