Alert archive / Montana / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 55, NWS Glasgow, MT

August 6, 2003Garfield County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Aug 6, 2003, 9:18 PM MDT for Garfield County, Montana. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 6, 2003, 9:18 PM MDT (03:18 UTC)
Expired
Aug 6, 2003, 10:15 PM MDT
In force
57 min
Issued by
NWS Glasgow, MT
Area
Counties, with a storm outline in the text

County Garfield County, MT

The radar

The Glasgow radar (KGGW), 107 km from the middle of the area, began a volume at 03:21 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.3 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 2003-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 29 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 2003-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 square meters per square second.19395878Sfc1 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
29 J/kg
Mixed-layer CIN
-218 J/kg
Mixed-layer LCL
3137 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
299 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

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.

NWS Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 6, 8:05 PM MDT, 1 hour 13 minutes earlier.

Area forecast discussion, Aug 6, 8:05 PM MDT, 1 hour 13 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
805 PM MDT WED AUG 6 2003

.SHORT TERM...TONIGHT
CURRENT FORECAST APPEARS TO BE IN VERY GOOD SHAPE. WILL UPDATE ONLY
TO UP THE POPS IN VALLEY COUNTY TO CHANCE GIVEN THE LINE OF STORMS
THAT ARE READY TO MOVE IN. HAVE ALSO TWEAKED THE WIND DOWN A BIT IN
SOME AREAS. WILL LEAVE LAKE WIND ADVISORY UP...BUT CAN SEE
POTENTIALLY TAKING IT DOWN LATER THIS EVENING AS WIND BEHIND THE
LINE MUCH LESS THAN AHEAD OF IT. SEVERE STORMS WILL HAVE A TUFFER
TIME MAINTAINING THEMSELVES AS THEY MOVE EAST INTO A LESS FAVORABLE
ENVIRONMENT.  VALONE

OVERALL LONGWAVE PATTERN DOESNT CHANGE MUCH WITH UPPER LOW OFF WEST
COAST BEING REINFORCD...AN STRRONG UPPER HIGH OVER SW STATES
STRONGLY RIDGING NORTH AND NOT MOVING. THEREFORE WILL RAISE HIGHS
AND GO WITH A PERSISTENTLY HOT FORECAST. WILL KEEP BROADBRUSH
ISOLATED THUNDERSTORMS FRIDAY. ALL MOS PERSISTENTLY TOO
CLOUDY...COOL...AND WET FOR THIS PATTERN AND TIME OF YEAR. SIMONSEN

.LONG TERM...FRI NIGHT THRU MON...
SAME AS ABOVE. MORE OF THE SAME AND HAVE RAISED TEMPERATURES WITH
GENERALLY HOT AND DRY WEATHER. SIMONSEN

KGGW BBB 066/096 065/097 063/095 78302220
     BBBB 063/095 062/095 062/091 062/088 8200000000
KGDV BBB 065/099 066/100 065/097 78022220
     BBBB 065/097 064/096 063/091 063/090 8200000000

.GGW...LAKE WIND ADVISORY FOR FORT PECK LAKE TONIGHT.
Hazardous weather outlook, Aug 6, 5:14 PM MDT, 4 hours 4 minutes before
MTZ016>027-059>062-072315-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
514 PM MDT WED AUG 6 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MONTANA

DAY ONE...

A LAKE WIND ADVISORY REMAINS IN EFFECT FOR FORT PECK LAKE THIS
TONIGHT. REFER TO GTFNPWGGW OR WWUS75 KGGW FOR FURTHER
INFORMATION.

ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE OVER NORTHEAST MONTANA
BEGINNING THIS EVENING IN WESTERN SECTIONS...PHILLIPS AND PETROLEUM
COUNTIES...SPREADING TO EASTERN SECTIONS OF NORTHEAST MONTANA LATE
TONIGHT. THE GREATEST THREAT FROM THE STORMS WILL BE STRONG GUSTY
WINDS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...
MOIST SOUTHWEST FLOW ALOFT WILL CONTINUE TO BRING THE SLIGHT RISK
FOR SEVERE THUNDERSTORMS TO NORTHEAST MONTANA ON THURSDAY. STRONG
GUSTY WINDS AND LARGE HAIL WILL REMAIN THE BIGGEST THREAT FROM ANY
SEVERE STORMS THAT DEVELOP IN THE AREA ON THURSDAY.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

SIMONSEN

In the hours before

Local storm report, Aug 6, 6:21 PM MDT, 2 hours 57 minutes before
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Local storm report, Aug 6, 6:44 PM MDT, 2 hours 34 minutes before
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Local storm report, Aug 6, 7:54 PM MDT, 1 hour 24 minutes before
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Local storm report, Aug 6, 8:34 PM MDT, 44 minutes before
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Local storm report, Aug 6, 8:42 PM MDT, 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
0842 PM MDT WED AUG 06 2003

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0835 PM    46 SW GLASGOW             MT   60 MPH WIND GUST
08/06/03   VALLEY

VALONE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 6:14 PM MDTSevere Thunderstorm WarningGGWPhillips61 min
Aug 6, 7:16 PM MDTSevere Thunderstorm WarningGGWPhillips59 min
Aug 6, 8:12 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum, Phillips, Valley63 min
Aug 6, 8:30 PM MDTSevere Thunderstorm WarningGGWGarfield, Phillips, Valley60 min
Aug 6, 9:29 PM MDTSevere Thunderstorm WarningGGWValley61 min
Aug 6, 10:13 PM MDTSevere Thunderstorm WarningGGWGarfield62 min
Aug 6, 10:30 PM MDTTornado WarningGGWGarfield60 min
Aug 6, 11:20 PM MDTSevere Thunderstorm WarningGGWGarfield55 min
Aug 6, 11:53 PM MDTSevere Thunderstorm WarningGGWDawson, McCone52 min
Aug 7, 12:15 AM MDTSevere Thunderstorm WarningGGWGarfield, Valley60 min
Aug 7, 12:53 AM MDTSevere Thunderstorm WarningGGWDawson67 min
Aug 7, 1:25 AM MDTSevere Thunderstorm WarningGGWRichland, Wibaux65 min
Aug 7, 2:50 AM MDTSevere Thunderstorm WarningGGWValley55 min
Aug 7, 5:43 PM MDTSevere Thunderstorm WarningGGWPetroleum62 min
Aug 7, 5:48 PM MDTSevere Thunderstorm WarningGGWPhillips57 min

Nearby

Severe Thunderstorm Warnings in Montana, 2003Every severe thunderstorm warning in 2003

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; radar from the NEXRAD Level II archive.