Alert archive / Montana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 21, NWS Glasgow, MT

August 26, 1990McCone County, Richland County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Aug 26, 1990, 2:07 PM MDT for McCone County, Richland County, Montana. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 26, 1990, 2:07 PM MDT (20:07 UTC)
Expired
Aug 26, 1990, 4:15 PM MDT
In force
2 hr
Issued by
NWS Glasgow, MT
Area
Whole counties

Counties McCone County, MT, Richland County, MT

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.1 hours before the alert went out and 120 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 12:00Z on 1990-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 12:00Z on 1990-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.1939Sfc1 km3 km6 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
2 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
606 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
36 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 KGGW 262007
SVRGGW
MTC055-083-262215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
207 PM MDT SUN AUG 26 1990
 
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  415 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTHEAST MONTANA
 
   ...NORTHEASTERN MCCONE COUNTY...NORTHERN RICHLAND COUNTY
 
AT 200 PM MDT RADAR INDICATED STRONG THUNDERSTORMS IN MCCONE AND
RICHLAND COUNTIES.  THESE THUNDERSTORMS ARE MOVING NORTHEAST AT
ABOUT 30 MILES PER HOUR.
 
THESE ARE DANGEROUS STORMS.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING. L  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER.
 
NNNN

Nearby

Severe Thunderstorm Warnings in Montana, 1990Every severe thunderstorm warning in 1990

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.