Area Forecast Discussion
Issued by NWS Billings, MT

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FXUS65 KBYZ 212050

Area Forecast Discussion
National Weather Service Billings MT
250 PM MDT Sat Apr 21 2018

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

Little in the way of changes to the inherited forecast this
afternoon, as models remain consistent with regard to cold front
tonight, and another disturbance across the region Monday.

A mainly dry cold front across our region late this evening and
overnight. The front will bring a period of gusty winds, but with
little moisture or upper level support, little or no precip is
expected. Continue to carry low PoP`s along the
Beartooths/Pryors/BigHorns and nearby foothills, as orographics
could be enough for a few showers.

Easterly winds and some cloud cover Sunday point to cooler temps,
but still seasonal, with upper 50s to lower 60s. That said,
expect increasing cloud cover and scattered rain and high
elevations snow showers developing late in the day as a trough
moves into the inner northern Rockies. This system is progged to
track right over our CWA late Sunday night through late Monday
night, spreading precip from west to east. Several inches of wet
snow are possible in the high country with some accumulation also
possible in the foothills by Monday morning.

The system will lead to a very wet and cool Monday across the
region. Precip in the plains will be mainly rain, but mixed precip
cannot be completely ruled out. Precip is expected to switch to
snow overnight Monday night, with greatest impacts in eastern
zones, where accumulations on cooler Monday night may allow for
some accumulations. Timing of this system exiting the region
remains a bit uncertain, with GFS much quicker, which would cut
back significantly on possible snow accumulations in the
southeast. Have not issued any highlights at this time due to
timing of precip across the area being mainly during the day
Monday. This system continues to need attention, as it crosses the
region, if only for timing, to better estimate possible snow. AAG

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

Mondays storm system moves out into the northern and central
plains during the day Tuesday. A few leftover rain and snow
showers will be possible during the day across southeast Carter
County. Otherwise, the forecast area looks to dry out. At this
time, it looks to be a quiet extended forecast. A clipper type
system drops southeast out of Canada across the eastern half of
Montana late Wednesday but right now models show little if any
moisture with it. High pressure ridging builds in for late Tuesday
and again Thursday into Saturday. Models bring a cutoff low onto
the California coast by the end of the week keeping a split flow
aloft to ridging over our forecast area. Temperatures will be
around normal Tuesday with readings above normal for the remainder
of the week. Hooley


Skies will be clear to mostly clear for the remainder of today
and through the overnight hours. A few high clouds will move
across the area but VFR conditions will prevail. The mountains and
adjacent foothills have a slight chance for a shower late this
evening and overnight. Hooley



    Sun     Mon     Tue     Wed     Thu     Fri     Sat
BIL 042/062 037/046 031/058 035/066 036/062 038/069 038/065
    10/B    69/O    30/U    01/U    21/U    00/U    11/U
LVM 037/062 034/043 023/057 031/063 033/062 035/066 035/063
    12/W    99/O    20/U    01/B    21/U    01/U    12/W
HDN 039/065 037/046 030/057 032/065 035/061 036/069 037/065
    10/B    59/O    30/U    01/U    21/U    00/U    01/U
MLS 043/065 038/046 031/058 035/064 035/060 036/066 037/065
    00/B    58/O    40/U    00/U    10/U    00/U    00/U
4BQ 039/063 039/046 031/055 034/064 034/057 036/064 036/063
    00/B    29/R    70/B    00/U    11/U    00/U    00/U
BHK 036/059 038/044 031/053 032/061 036/055 036/062 034/060
    00/B    17/R    60/B    00/U    10/U    00/U    00/U
SHR 038/065 036/044 028/056 030/065 033/058 035/067 035/065
    00/U    39/R    51/B    01/U    21/B    01/U    11/U




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