Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 231447
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
847 AM MDT Tue Apr 23 2019

.DISCUSSION...

Main change was to lower MinRH for today. The CMCnhBC model
handled this best last Friday when we had a warm/dry day and think
it`ll get us in the ballpark again. Will update the Fire Weather
Forecast, too.

Otherwise, going forecast looked to be in good shape. TFJ

Previous Discussion...
Zonal flow aloft will prevail across the region. A shortwave
trough will move across the Canadian Prairies this morning and
bring a warm front across Eastern Montana. This will bring warmer
temperatures and gusty west winds to the forecast area today. A
Lake Wind Advisory will remain in effect for this afternoon and
evening. The west winds will diminish somewhat after sunset this
evening.

The next wave in the zonal flow aloft will move along the
MT/Canada border on Wednesday. This will bring a cold front across
the forecast area with temperatures that will be 5 to 10 degrees
cooler than today. There will also be enough moisture and
instability for a slight chance of showers and thunderstorms.

Flow aloft turns to the WNW Wednesday Night and Thursday. Surface
high pressure builds into the forecast area with dry weather on
Thursday.

A shortwave trough on Friday will bring a cold front through
Northeast Montana. Look for a chance of showers and thunderstorms
mainly in the afternoon and evening.

Upper trough through the Pacific NW and Montana over the weekend.
This will bring colder temperatures and enough moisture for
chances of rain and snow depending on temperatures. Models differ
on timing of precipitation and temperatures at this point so there
is uncertainty on how much rain and/or snow will fall at this
point.

The system moves to the east early next week but waves in the
zonal flow aloft may be enough for chances of precipitation.
Forrester



&&

.AVIATION...

FLIGHT CONDITIONS: VFR.

DISCUSSION: Clearing will take place today as west winds increase,
with gusts to 30 kts. Winds will diminsh after sunset. TFJ

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory from noon today to 8 PM MDT this evening For
Fort Peck Lake for Central and Southeast Phillips...Central and
Southern Valley...Garfield...McCone...Petroleum.

&&

$$

weather.gov/glasgow


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