Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 230908

Area Forecast Discussion
National Weather Service Glasgow MT
308 AM MDT Wed Aug 23 2017

.SHORT TERM...for northeast through Thu...

Main forecast concerns in this short-term period focus on hot and
dry conditions ahead of the next cool front.

The strong ridge of high pressure now over most of the western
states and the Rocky Mountain region will be in control through
Thursday afternoon. Expecting high temperatures to easily climb
into the 90s. Daily relative humidity values are expected to drop
into the teens for many locations - especially on Thursday. Some
breezy to gusty winds on Thursday could heighten fire weather
concerns. For now, chose to mention this in the fire weather
forecast narrative as marginal conditions.

Later Thursday afternoon, the next low pressure trough from the
west coast of Canada pushes through the continental divide and
turns the flow aloft for NE Montana from the SW. There seems to be
enough moisture and instability to set off some showers and
thunderstorms beginning late Thursday.


.LONG TERM...Thu night through Wed...

Upper trof moving across the Canadian Rockies on Thursday night
will push a cold front through eastern Montana. Enough convergence
and moisture along the front to produce scattered convection with
localized wetting rains overnight and into Friday morning.
Temperatures drop back closer to normal following the frontal
passage, with only moderate cooling as the upper trof lifts north
toward the arctic. With only weak cold air advection, strong post
frontal winds are not expected, for only marginally critical fire
weather conditions Friday afternoon.

Zonal flow transitions to the northwest over the weekend as upper
ridge rebounds over the Great Basin. Generally dry conditions with
warming temperatures expected through early next week.




Synopsis: A ridge of high pressure in control over the entire
region will keep skies clear and winds light for a perfect day of
flying today.

Flight Conditions: VFR.

Winds: Light winds from the east and southeast today will increase
more directly from the east later tonight, but shouldn`t be much
stronger than 13 kts or so.





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