Alert archive / Montana / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 14, NWS Great Falls, MT

August 3, 1992Petroleum County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 3, 1992, 7:28 PM MDT for Petroleum County, Montana. It was in force for 47 min.

The area

The counties it named.

The facts

Issued: Aug 3, 1992, 7:28 PM MDT (01:28 UTC)
Expired: Aug 3, 1992, 8:15 PM MDT
In force: 47 min
Issued by: NWS Great Falls, MT
Area: Whole counties

County Petroleum County, MT

The nearest sounding before it

Great Falls, MT (KGTF), launched 00:00Z, 1.5 hours before the alert went out and 233 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3302 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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

Local storm report, Aug 3, 2:41 PM MDT, 4 hours 47 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS, MT
225 PM MDT MON AUG 03 1992

TIME           EVENT

845 PM MDT    1 INCH TO 1 1/2 INCH HAIL REPORTED BY WEATHER SERVICE
AUG 2         EMPLOYEE LIVING AT 219-14TH AVE SOUTH, GREAT FALLS.
              SOME HAILSTONES OVAL OR CONICAL...CHANGED TO PEA
              SIZED.
END/SEB

Special weather statement, Aug 3, 5:00 PM MDT, 2 hours 28 minutes before

MTZ003-040030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
500 PM MDT MON AUG 3 1992

STRONG THUNDERSTORMS ARE MOVING ACROSS THE CANADIAN BORDER INTO
GLACIER COUNTY. THE THUNDERSTORMS ARE MOVING TO THE SOUTHEAST AT
25 MPH. AN OBSERVER IN MOUNTAIN VIEW, ALBERTA, WHICH IS JUST NORTH
OF THE CANADIAN BORDER, REPORTED MARBLE-SIZED HAIL AT 4:20 PM MDT.

PERSONS IN GLACIER COUNTY AND WESTERN TOOLE COUNTY SHOULD BE
PREPARED FOR HAIL, STRONG GUSTY WINDS, AND BRIEF HEAVY RAIN UNTIL
630 PM MDT.

BLANK

Special weather statement, Aug 3, 6:10 PM MDT, 1 hour 18 minutes before

MTZ003-040130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
610 PM MDT MON AUG 3 1992

...STRONG THUNDERSTORM MOVING INTO PONDERA COUNTY...

RADAR AT 6PM SHOWED A STRONG THUNDERSTORM 8 MILES NORTHEAST OF
VALIER. THIS STORM IS MOVING TO THE SOUTHEAST AT 25 MILES AN HOUR
AND HAS BECOME STRONGER OVER THE LAST HALF HOUR.

PERSONS IN CENTRAL AND EASTERN PONDERA COUNTY SHOULD BE PREPARED
FOR HAIL, STRONG GUSTY WINDS, AND BRIEF HEAVY RAIN UNTIL 730 PM MDT.
THIS INCLUDES THE TOWNS OF VALIER AND CONRAD.

A SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL MIDNIGHT
MDT FOR MUCH OF CENTRAL MONTANA.

BLANK

Special weather statement, Aug 3, 6:10 PM MDT, 1 hour 18 minutes before

MTZ005-040115-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HAVRE MT
605 PM MDT MON AUG 3 1992

...SEVERE THUNDERSTORM WATCH FOR NORTH-CENTRAL MONTANA UNTIL
MIDNIGHT...

THUNDERSTORMS WERE SLOWLY FORMING AS OF 6 PM...BUT REMAIN WIDELY
SCATTERED.

ONE THUNDERSTORM HAD JUST FORMED 15 MILES NORTH OF HAVRE. MOVING
TO THE SOUTHEAST AT 25 MPH...IT WILL MOVE INTO THE CHINOOK AREA
BY 7 PM.

A LARGER...STRONGER THUNDERSTORM WAS IN THE CUT BANK-SHELBY AREA...
EXTENDING NORTH TO LETHBRIDGE...AND EARLIER HAD PRODUCED SMALL HAIL.

LIGHTNING STRIKE CHARTS SHOWED A COUPLE OTHER THUNDERSTORMS HAD
DEVELOPED IN EASTERN BLAINE COUNTY.

NO SEVERE WEATHER HAS BEEN REPORTED...NOR ANY IN MONTANA SO FAR$
TODAY. HOWEVER...A SEVERE THUNDERSTORM WATCH MEANS LARGE HAIL AND
DAMAGING WINDS...AS WELL AS FREQUENT LIGHTNING STRIKES AND HEAVY
SHOWERS ARE POSSIBLE.
SIMONSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 6:50 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Hill	70 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.