Area Forecast Discussion
Issued by NWS Glasgow, MT
FXUS65 KGGW 230858
Area Forecast Discussion
National Weather Service GLASGOW MT
258 AM MDT SAT JUL 23 2016
.SHORT TERM...for northeast Montana...today through Mon...
A short-wave trough will continue to move east through Southern
Saskatchewan and Northeast Montana this morning before lifting
north into Manitoba during the afternoon. There may be a few
lingering showers and possible thunder before 15z, but the main
effect of the wave will be strong northwest winds. Expect winds
of 20-30kt by mid morning. Therefore will go ahead and issue a
Lake Wind Advisory for Fort Peck Lake that will continue into this
evening, ending at 03z. The other main effect with the cool air
advection will be a dramatic drop in temperatures from Friday,
from the mid to upper 90s to upper 70s to mid 80s.
A secondary trough swings across the area that may bring isolated
storms tonight, but not expecting any strong storms. After sunset
winds become light and variable.
Sunday through Monday, a ridge builds up over the west initially
then flattens out becoming zonal. This will bring a dry period
with gradual warming from slightly below to normal temperatures.
.LONG TERM...Mon night through Sat...
Quasi-zonal flow aloft is expected Monday Night and Tuesday.
Monday Night and Tuesday morning looks mainly dry with a shortwave
ridge. Will see warm summerlike temperatures over the region. A
shortwave trough Tuesday Night with unstable air mass could
produce thunderstorms over the forecast area starting Tuesday
afternoon and continuing through Wednesday.
Another wave on NW flow aloft Wednesday Night and Thursday will
bring more chances for showers and thunderstorms with somewhat
The chance for showers and thunderstorms could linger into Friday
as models differ on how quickly to move the wave to the east.
Then, an upper ridge builds into the area with mainly dry weather
for Saturday. Forrester
SYNOPSIS: Low pressure system in Southern Saskatchewan this
morning will move to the northeast today. Expect VFR conditions
with some mid and high clouds at times. Isolated thunderstorms
early this morning will exit the region by 12z. Isolated showers
are possible near the Canadian border today. Surface high builds
into the area tonight with mostly clear skies.
WINDS: Gusty west to northwest 10 to 15 knots early increasing to
15 to 25 knots by afternoon. Northwest winds will diminish to 5 to
10 knots after sunset this evening.
Lake Wind Advisory from 9 AM this morning to 9 PM MDT this
evening For Fort Peck Lake for Central and Southeast Phillips...
Central and Southern Valley...Garfield...McCone...Petroleum.