Alert archive / Montana / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 21, NWS Glasgow, MT

August 15, 1993Garfield County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Aug 15, 1993, 8:21 PM MDT for Garfield County, Montana. It was in force for 54 min.

The area

The counties it named.

The facts

Issued
Aug 15, 1993, 8:21 PM MDT (02:21 UTC)
Expired
Aug 15, 1993, 9:15 PM MDT
In force
54 min
Issued by
NWS Glasgow, MT
Area
Whole counties

County Garfield County, MT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.4 hours before the alert went out and 109 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, Glasgow Intl Airport, MT at 00:00Z on 1993-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 211 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, Glasgow Intl Airport, MT at 00:00Z on 1993-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
211 J/kg
Mixed-layer CIN
-157 J/kg
Mixed-layer LCL
2582 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

Open this sounding in Storm Lab

The text

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

000 
WUUS1 KGGW 160221 RRA
SVRGGW
MTC033-160315-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
821 PM MDT SUN AUG 15 1993
 
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  915 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...........
 
IN NORTHEAST MONTANA
 
   ...NORTHWESTERN GARFIELD COUNTY
 
A STORM SPOTTER NEAR BRUSSETT IN NORTHWEST GARFIELD COUNTY REPORTED
STRONG WINDS...HEAVY RAIN AND HEAVY HAIL.  THIS STORM IS MOVING TO THE
NORTH AT 15 TO 20 MPH.  HAIL WAS MARBLE SIZE AND A LITTLE BIGGER.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
 
 
 
&
NNNN

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, Aug 15, 7:28 PM MDT, 53 minutes before
MTC033-160230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
728 PM MDT SUN AUG 15 1993

AT 720 PM MDT THIS SUNDAY EVENING BILLINGS RADAR INDICATED POSSIBLE
HEAVY THUNDERSTORMS 30 TO 35 MILES SOUTHWEST OF JORDAN MT.  THESE
STORMS ARE MOVING TO THE NORTH NORTHWEST AT 15 TO 20 MPH.  THESE
THUNDERSTORMS COULD PRODUCE STRONG WINDS...HEAVY RAIN AND SMALL
HAIL.

TRACY

NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 9:28 PM MDTSevere Thunderstorm WarningGGWValley62 min

Nearby

Severe Thunderstorm Warnings in Montana, 1993Every severe thunderstorm warning in 1993

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.