Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 191524 AAA

Area Forecast Discussion...UPDATED
National Weather Service Glasgow MT
924 AM MDT Mon Mar 19 2018


Sent an update this morning to adjust overnight low temperatures
based on latest warmer observed temperatures and blended that into
the forecast high temperatures for today. Also, tried to find the
best model consensus for the lingering light snow fall maybe
mixing with rain into this afternoon. A few locations may still a
quarter inch of snow here or there.          BMickelson

Previous discussion: Occasional light snow still occuring over
mainly the eastern zones this morning, but will be tapering off as
the system continues to move east. Area of low cloud and fog
extends across most of eastern Montana and will likely persist
through most of the day.

Additional light snow is expected tonight into Tuesday morning as
a weak front and the remnants of the upper trof push through the
state. Any accumulations should be light, for little impact.

Wednesday and Thursday will see warmer and drier weather as an
upper ridge builds into the state. Temperatures may rise into the
40s across the south for increased melting of the snow pack.

By the end of the week the upper low off the Pacific Northwest
will begin pushing moisture back across the divide. Warm front
lifts across the state on Thursday night with southeast winds
increasing ahead of the front. Mixed precipitation likely with the
front, but the period of most intensity will be Friday morning
with highest potential for snow. This could result in 2 to 3
inches of snow over the northeast corner of the state.

Additional rain/snow expected through the weekend with the upper
trof moving from the mountains into the plains but details are
still uncertain. Ebert



A mix of MVFR and IFR conditions are expected through the TAF
period. Low cloud and patchy fog will persist across the region
along with occasional light snow as an upper low moves into the
northern Plains. Conditions should begin improving by Tuesday
afternoon.       BMickelson



The first hydrology concerns of the season have arrived.

The Musselshell River has begun to break up and ice is now flowing
in the Roundup area. Ice jams are possible downstream of Roundup
through the Melstone area.

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, especially on Wednesday and
Thursday, will increase snow melt and aid ice break up.


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


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