Alert archive / Montana / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 4, NWS Missoula, MT

June 28, 1992Granite County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jun 28, 1992, 3:15 PM MDT for Granite County, Montana. It was in force for 60 min.

The area

The counties it named.

The facts

Issued: Jun 28, 1992, 3:15 PM MDT (21:15 UTC)
Expired: Jun 28, 1992, 4:15 PM MDT
In force: 60 min
Issued by: NWS Missoula, MT
Area: Whole counties

County Granite County, MT

The nearest sounding before it

Great Falls, MT (KGTF), launched 12:00Z, 9.3 hours before the alert went out and 202 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: 51 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 32 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 KMSO 282114 RRA
SVRMSO
BULLETIN-EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA, MT
315 PM MDT SUN JUN 28 1992
MTC039-282215-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
315 PM MDT SUN JUN 28 1992

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 415 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES

   IN THE WEST CENTRAL PART OF MONTANA:
      SOUTH GRANITE COUNTY...NEAR GEORGETOWN LAKE

AT 300 PM MISSOULA RADAR DETECTED A SEVERE THUNDERSTORM ON THE
SOUTHERN EDGE OF GRANITE COUNTY 4 MILES WEST OF GEORGETOWN LAKE.  THIS
STORM IS MOVING TO THE NORTHEAST AT 15 TO 20 MPH AND WILL PASS JUST TO
THE SOUTH OF PHILLIPSBURG WITHIN AN HOUR.  THIS STORM IS DANGEROUS AND
WILL LIKELY CONTAIN LARGE HAIL..HEAVY RAIN..AND STRONG WINDS.

 PEOPLE IN SOUTHERN GRANITE COUNTY...ESPECIALLY NEAR GEORGETOWN LAKE
 AND PHILLIPSBURG NEED TO WATCH FOR THE APPROACHING DANGEROUS STORM AND
 TAKE COVER IF NECESSARY.  REMEMBER...LIGHTNING IS ONE OF THE BIGGEST
 WEATHER-RELATED KILLERS.

END/RICHMOND

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 28, 2:26 PM MDT, 49 minutes before

MTZ002-282300-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MISSOULA MT
215 PM MDT SUN JUN 28 1992

AT 2 PM MISSOULA WEATHER RADAR WAS DETECTING STRONG THUNDERSTORMS OVER
MUCH OF RAVALLI AND GRANITE COUNTIES.  THESE THUNDERSTORMS ARE MOVING
NORTHEAST AT 15 TO 20 MPH.  THE STRONGEST STORM CONTINUES TO BE THE ONE
LOCATED IN RAVALLI COUNTY WHICH WILL PROBABLY CROSS U.S. HIGHWAY 93
BETWEEN SULA AND CONNER IN A HALF HOUR OR SO.  ANOTHER STRONG STORM WAS
LOCATED JUST WEST OF DRUMMOND AND WILL MOVE UP THROUGH THE HELMVILLE AREA
IN THE NEXT HOUR.

THESE THUNDERSTORMS WILL LIKELY CONTAIN HEAVY RAIN...POSSIBLY LARGE HAIL
AND STRONG WINDS.  IN ADDITION...A SEVERE THUNDERSTORM WATCH IS IN EFFECT
THROUGH THIS EVENING FOR ALL OF WESTERN MONTANA AS CONDITIONS ARE FAVORABLE
FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS.  REMEMBER...A WATCH MEANS
SEVERE THUNDERSTORMS ARE POSSIBLE...BUT NOT ACTUALLY OCCURRING.  WARNINGS
WILL BE ISSUED FOR SEVERE THUNDERSTORMS AS THEY OCCUR.  STAY TUNED TO NOAA
WEATHER RADIO OR LOCAL T.V. AND RADIO FOR MORE INFORMATION.   END/RICHMOND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 1:42 PM MDT	Severe Thunderstorm Warning	MSO	Ravalli	63 min
Jun 28, 3:10 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	65 min

Nearby

Severe Thunderstorm Warnings in Montana, 1992 Every severe thunderstorm warning in 1992

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.