Area Forecast Discussion
Issued by NWS Billings, MT

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FXUS65 KBYZ 102140

Area Forecast Discussion
National Weather Service Billings MT
240 PM MST Sat Dec 10 2016

.SHORT TERM...valid for Sun and Mon...

Bands of snow showers continue across the area as the last push of
energy moves across with the trough axis moving through. Snow
will begin to clear out over the next couple of hours from west to
east. Given that some of the bands are still producing some quick
accumulations, advisories and warnings continue across the area.

Sunday still looks to be the warmest day in the forecast.
Temperatures for most of the area will be in the 20s to near 30
degrees as the arctic air mass continue to retreat east. However
there will be some stronger west winds that will move in as the
cold air moves out. With the light nature of the snow that has
been falling, these gusty winds could lead to some issue with
blowing and drifting snow.

Sunday night another arctic surge will begin to push into Montana.
By Monday morning the arctic should be through most of the state
bring temperatures back into the single digits for highs across
the area, and producing another quick couple of inches across the
area. Reimer

.LONG TERM...valid for Tue...Wed...Thu...Fri...Sat...

A very cold week was in store for the forecast area with chances for
snow increasing by midweek. Models were in good agreement until

Arctic high will be settled over the area on Tue. with low
chances for snow over and near the mountains. Temperatures will be
well below normal in the single digits to teens. A Pacific jet
will buckle northward on Wed. bringing divergence to the area
through Wed. night. Moisture moving north into the area will bring
a slight chance of snow to areas from KLVM to KBIL south Wed.
night. Temperatures will be similar to Tue. on Wednesday. Models
differed in how they handled incoming Pacific shortwaves for Thu.
and Thu. night. Both models had arctic fronts moving back south
into the region, but differed in their moisture depictions. Used
model blends for PoPs which resulted in chances for snow across
the SW part of the area on Thu., and across the entire area Thu.
night. Blended temperatures were in the single digits E to the
lower 20s W. Upper troughing with differences in model details
continued through Saturday. Went with a chance of snow for the
area on Fri. with slight chances for the rest of the period.
Friday looked very cold with 850 mb temperatures around -24
degrees c which resulted in highs above and below zero. Lows Fri.
night could reach the teens below zero to around 20 below zero.
Saturday looked even colder than Fri. with highs around zero.



Bands of snow will produce MVFR to LIFR conditions as they
move E across the region through early this evening. Conditions
will improve to VFR from W to E this evening by 04Z. Mountain
obscurations will decrease tonight. VFR will continue over the
area on Sunday. Mountain obscurations will increase over the
Beartooths, Absarokas and Crazys. Arthur



    Sun     Mon     Tue     Wed     Thu     Fri     Sat
BIL 012/029 007/009 902/012 906/012 001/012 901/004 913/000
    31/B    25/S    41/B    01/U    23/S    43/S    22/J
LVM 014/031 015/018 003/016 902/015 007/018 901/005 913/001
    33/S    46/S    52/J    11/B    23/S    43/S    22/J
HDN 008/029 007/009 902/013 907/014 901/014 902/006 914/000
    41/B    25/S    41/B    11/U    22/S    43/S    22/J
MLS 000/019 001/005 905/010 906/011 904/010 905/003 916/901
    60/B    35/S    21/B    00/U    01/B    33/S    22/J
4BQ 005/026 005/010 904/013 902/014 000/014 000/007 913/901
    50/B    14/S    21/B    00/U    12/S    33/S    22/J
BHK 902/015 901/003 907/006 906/006 907/007 906/002 916/906
    70/B    24/S    11/B    00/U    01/B    33/S    22/J
SHR 012/030 011/015 902/013 905/013 002/018 901/004 912/902
    61/B    14/S    31/B    11/B    22/S    33/S    22/J


MT...Winter Weather Advisory in effect until 6 PM MST this evening
      FOR ZONES 28>32-34-35-39>42-56-57-63>66.
     Winter Storm Warning in effect until 6 PM MST this evening
      FOR ZONE 67.
WY...Winter Weather Advisory in effect until 6 PM MST this evening
      FOR ZONE 98.


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