Alert archive / Montana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 9, NWS Glasgow, MT

June 28, 1990Roosevelt County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 28, 1990, 6:15 PM MDT for Roosevelt County, Montana. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jun 28, 1990, 6:15 PM MDT (00:15 UTC)
Expired
Jun 28, 1990, 7:15 PM MDT
In force
60 min
Issued by
NWS Glasgow, MT
Area
Whole counties

County Roosevelt 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 00:00Z, 0.3 hours before the alert went out and 118 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 1990-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 94 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 1990-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -106 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
94 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
2104 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-106 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.4

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

Special weather statement, Jun 28, 4:51 PM MDT, 1 hour 24 minutes before
MTZ008-282245-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
445 PM MDT THU JUN 28 1990

AT 440 PM...BILLINGS AND WILLISTON RADAR SHOWED A LINE OF STRONG
THUNDERSTORMS EAST OF GLASGOW EXTENDING NORTHEAST INTO CANADA.
THESE STORMS ARE MOVING TOWARDS THE EAST-NORTHEAST AT ABOUT 25 MILES AN
HOUR. WHILE THERE ARE NO WATCHES OR WARNINGS IN EFFECT AT THIS
TIME...PERSONS IN THE PATH OF THESE STORMS SHOULD EXPECT BRIEF HEAVY
RAIN...HAIL AND STRONG GUSTY WINDS. YOUR NATIONAL WEATHER SERVICE WILL
CONTINUE TO MONITOR THESE STORMS AND WILL ISSUE WARNINGS IF NEEDED.

WALKER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 6:45 PM MDTSevere Thunderstorm WarningGGWGarfield60 min
Jun 28, 7:00 PM MDTTornado WarningGGWRichland, Roosevelt60 min

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.