Area Forecast Discussion
Issued by NWS Billings, MT

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FXUS65 KBYZ 102120

Area Forecast Discussion
National Weather Service Billings MT
320 PM MDT Tue Oct 10 2017

.SHORT TERM...valid for Wed and Thu...

Ridging with southwest flow aloft will keep dry and warm
conditions in place for one more day. Cold front arrives late on
Wednesday with a chance for showers over areas west of Billings,
in addition to gusty west to northwest winds. Timing of the
strongest winds behind the front is late Wednesday night which
should limit gusts to the 30 mph range, but there is some
stronger wind just off the surface that could push down here and
there, especially in the foothills that we will keep an eye on.
Temperatures drop from the 60s/70s to the 40s/50s for Thursday
behind the front. Not much chance of precipitation Thursday
outside of the mountains with westerly winds behind the front
keeping downslope pressure in place. Thursday night low level flow
turns northerly for a better chance of upslope generated
precipitation. With temperatures forecast well below freezing
Thursday night any precipitation will be mainly light snow.

.LONG TERM...valid for Fri...Sat...Sun...Mon...Tue...

A relatively active beginning to the long term forecast will be
followed by a period of warming temperatures and increasing wind
as lee-side troughing moves in under elevated west northwest flow.

An elongated trough of low pressure will pass through the region
Friday evening. This will increase precip chances Friday night into
Saturday morning. Forcing will be relatively weak with this
system so rain/snow showers will be scattered in nature across
the area. Trough passes through the region by Saturday afternoon
with and remaining showers departing eastern Montana into the

West northwest flow takes over quickly overnight Saturday into
Sunday and will dry conditions out. Lee-side pressure falls over
the Plains will tighten the pressure gradient across the Rocky
Mountain front so expect a noticeable increase in the winds
Saturday Night and Sunday night, especially in our gap flow
favored regions. Looking ahead through the middle of the work
week, there is good agreement that the breezy pattern will remain
in place absent of any incoming weather systems. With heights
slowly increasing through the week, combined with the downslope
component of the winds, expect warmer temperatures through much of
next week with temperatures in the low 60s. Dobbs



VFR conditions will prevail through the TAF period, though breezy
conditions are anticipated at KLVM under the influence of strong
southwest gap flow. Expect occasional 30 to 40 kt gusts through
the TAF period at KLVM. Elsewhere, southwest winds around 5 to 15
kts are expected at KBIL and KMLS. KSHR will see lighter winds
around 5 to 10 kts through the TAF period. Dobbs



    Wed     Thu     Fri     Sat     Sun     Mon     Tue
BIL 041/066 037/053 030/052 033/049 033/056 037/062 040/063
    00/U    21/B    01/B    33/W    11/B    00/U    11/U
LVM 034/064 032/048 024/047 028/045 030/053 033/058 035/058
    01/N    52/W    13/W    43/J    11/N    00/N    00/N
HDN 037/070 037/056 031/055 032/051 032/058 035/064 037/064
    00/U    11/B    01/B    33/W    11/B    00/U    01/U
MLS 036/071 037/055 030/054 033/049 032/056 036/063 039/063
    00/U    01/B    01/B    22/W    11/U    00/U    00/U
4BQ 035/070 037/056 030/055 032/049 030/055 035/063 038/063
    00/U    00/B    01/B    23/W    11/U    00/U    00/U
BHK 033/069 036/054 028/052 031/047 030/053 034/061 038/062
    00/U    01/B    03/W    33/W    31/U    00/U    00/U
SHR 034/068 035/054 027/053 028/049 026/056 032/063 035/063
    00/U    11/B    01/B    13/W    11/U    00/U    00/U




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