FXUS65 KGGW 210206 AAA

Area Forecast Discussion...UPDATED
National Weather Service Glasgow MT
806 PM MDT Tue Mar 20 2018


The main focus tonight will be areas of fog and how dense the fog
will get. At this time it appears that a dense fog advisory will
not be needed. Otherwise the forecast is in fairly good shape.

Previous Discussion:

Two main weather challenges were handed to us this afternoon -
tonight's fog then Friday's precipitation.

Currently, with a thick snowpack in place across the CWA, the warm
moist air overriding this has created a dense low cloud deck that
would drop to the ground upon sunset to create dense fog issues.
But west winds this afternoon will clear some of this out, but
light winds return this evening. A Dense Fog Advisory may be
needed for some areas tonight.

With warm air advecting into the area through much of this week,
we'll be wrestling with this while watching the next system moves
in with mainly rain about Friday.

With an upper trough opening up near the west coast, it will send
another disturbance up from the southwest late Saturday, mostly
in the form of snow.

Mainly dry conditions are expected thereafter but upper
disturbances will keep small chances of light precip around. TFJ


Flight Conditions: VFR lowering AFT 06Z to MVFR with some IFR
later tonight with possible Airport Shutdown with VLIFR conditions
at KGDV AFT 09Z.

Fog will move in again tonight with warm, moist air overriding
the colder ground (because of the snowpack). Confidence on
intensity and timing is moderate, so monitor TAFs for the latest

Winds: Light and variable. TFJ/Proton



A Flood Watch for ice jams along the portion of the Musselshell
River between Petroleum and Garfield Counties remains in effect to
raise awareness. Warming temperatures through mid-week will
likely increase area snow melt and aid a more widespread ice break


Flood Watch through Thursday morning for Garfield...Petroleum.



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