Alert archive / Montana / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 64, NWS Glasgow, MT

August 7, 2003Petroleum County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Aug 7, 2003, 5:43 PM MDT for Petroleum County, Montana. It was in force for 62 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 7, 2003, 5:43 PM MDT (23:43 UTC)
Expired
Aug 7, 2003, 6:45 PM MDT
In force
62 min
Issued by
NWS Glasgow, MT
Area
Counties, with a storm outline in the text

County Petroleum County, MT

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 7, 3:45 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.7 hours before the alert went out and 181 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, Great_falls, MT at 12:00Z on 2003-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Great_falls, MT at 12:00Z on 2003-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -81 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2439 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-81 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 7, 2:30 PM MDT, 3 hours 13 minutes earlier.

Area forecast discussion, Aug 7, 2:30 PM MDT, 3 hours 13 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
230 PM MDT THU AUG 7 2003

.SHORT TERM...THURSDAY NIGHT THROUGH SATURDAY.
UPPER LEVEL TROUGH TO THE WEST AND UPPER LEVEL HIGH TO SOUTH WILL
CONTINUE TO BRING NORTHEAST MONTANA SOUTHWEST FLOW ALOFT WITH SHORT
WAVES MOVING THROUGH THE AREA FOR THE NEXT COUPLE OF DAYS.
ATMOSPHERE IS STILL UNSTABLE SO THUNDERSTORMS ARE POSSIBLE TONIGHT.
UPPER LEVEL PATTERN REMAINS FOR TOMORROW EVENING...ALSO.

PATTERN SIMILAR FOR FRIDAY AND FRIDAY NIGHT.  ON SATURDAY...THE
UPPER LEVEL HIGH RETROGRADES WEST.  WITH THE UPPER LEVEL HIGH
FURTHER WEST NORTHEAST MONTANA WILL HAVE MORE OF A ZONAL FLOW.
YET...STORMS ARE STILL POSSIBLE SATURDAY AFTERNOON AS UPPER LEVEL
DISTURBANCE BEGINS TO MOVE INTO NORTHEAST MONTANA.  THE MODELS ARE
IN GENERAL AGREEMENT.  TEMPERATURES NEXT COUPLE OF DAYS WILL BE
ABOVE NORMAL AND HOT IN MOST AREAS.  TLSJR

.LONG TERM...SATURDAY NIGHT THROUGH THURSDAY
TROUGH REMAINS NEARLY STATIONARY ACROSS THE GREAT LAKES AND IS
FORECAST TO DRIFT VERY SLOWLY EASTWARD DURING THE COURSE OF NEXT
WEEK. THUS, LONGWAVE TROUGH OFFSHORE THE PACIFIC NORTHWEST COAST
WILL REMAIN PRETTY MUCH IN PLACE THROUGH NEXT WEEK. SHORTWAVES WILL
EJECT EAST AND NORTHEAST ACROSS THE PACIFIC NORTHWEST AND NORTHERN
ROCKY MOUNTAINS THROUGH THIS WEEKEND INTO NEXT WEEK WITH TIMING OF
EACH SHORTWAVE QUITE DIFFICULT. STRONG DAYTIME HEATING AND ABUNDANT
LOW LEVEL MOISTURE WILL PROVIDE INSTABILITY FOR THUNDERSTORM
DEVELOPMENT ALONG AND AHEAD OF THESE SHORTWAVES AS THEY MOVE
NORTHEAST ACROSS THE CWFA. ONE SUCH SHORTWAVE IS INDICATED TO MOVE
ACROSS THE REGION SATURDAY NIGHT INTO SUNDAY SO POPS HAVE BEEN
CONTINUED FROM SATURDAY AFTERNOON INTO THE SATURDAY NIGHT AND SUNDAY
TIME PERIOD. WITH THE ABOVE MENTIONED LONGWAVE TROUGH REMAINING TO
THE WEST OF THE CWFA, VERY LITTLE CHANGE SEEN FROM EARLIER FORECAST
IN THE WAY OF TEMPS, DEW POINTS, AND WIND. LYNN

KGGW EBB 065/095 063/093 063/093 88222022
     BBBB 062/095 062/091 062/088 059/088 7730000000
KGDV EBB 066/098 065/095 065/095 88222000
     BBBB 064/096 063/091 063/090 062/089 7730000000

.KGGW...NONE.
Hazardous weather outlook, Aug 7, 4:15 PM MDT, 1 hour 28 minutes before
MTZ016>027-059>062-081145-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
415 PM MDT THU AUG 7 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MONTANA

.DAY ONE...
A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 PM MDT FOR MUCH OF
NORTHEAST MONTANA. THE GREATEST THREAT FROM THE STORMS WILL BE
STRONG GUSTY WINDS AND LARGE HAIL. PLEASE REFER TO WWUS65 KGGW OR
GTFWCNGGW FOR FURTHER DETAILS.

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

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Aug 7, 12:57 PM MDT, 4 hours 46 minutes before
PRELIMINARY LOCAL STORM REPORT : CORRECTION
NATIONAL WEATHER SERVICE GLASGOW MT
1257 PM MDT THU AUG 07 2003

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

1000 AM    HELL CREEK RECREATION ARE MT   60 MPH WIND GUST
08/07/03   GARFIELD

1000 AM    20 N GLENDIVE             MT   0.75 IN HAIL
08/07/03   DAWSON

1039 PM    BLOOMFIELD                MT   60 MPH TSTORM WIND
08/06/03   DAWSON                         FEW SHINGLES OFF ROOF

1030 PM    40 NE JORDAN              MT   60 MPH TSTORM WIND
08/06/03   GARFIELD

0115 PM    20 NE COHAGEN             MT   60 MPH TSTORM WIND
08/06/03   GARFIELD

1039 PM    20 NE COHAGEN             MT   60 MPH TSTORM WIND
08/06/03   GARFIELD

SIMONSEN

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, 9:18 PM MDTSevere Thunderstorm WarningGGWGarfield57 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, 5:48 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.