Area Forecast Discussion
Issued by NWS Billings, MT

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FXUS65 KBYZ 250222

Area Forecast Discussion...Updated
National Weather Service Billings MT
822 PM MDT Tue Apr 24 2018

No update needed this evening. Upper ridging and dry air in mid
and upper levels seen on water vapor imagery, will be over the
area tonight. Per earlier visible imagery and current web cams,
much of the snow cover has melted, adding moisture to an already
wet ground. Yesterday`s system provided an average of a half inch
to an inch of precipitation over much of the area. Light winds,
clear skies and ample ground moisture will set the stage for
patchy fog tonight. Forecast lows in the upper 20s to mid 30s were
right on track. Arthur


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

Ridge aloft builds in through the day tomorrow for warm sunny and
dry conditions. Highs will approach 70 degrees Wednesday
afternoon. A fast moving clipper system will move in tomorrow
evening bringing a chance for showers and maybe a few
thunderstorms to areas west of Rosebud county. Foothills and
mountains will see best chances for precipitation with winds
becoming upslope oriented. Precipitation chances quickly erode
overnight for a sunny day Thursday and temperatures in the 60s.

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

Mainly dry and warm conditions can be expected Friday into
Saturday as a ridge of high pressure dominates the weather over
the region. The ridge begins to shift east by late in the day
Saturday as models prog an upper low to move into the Pac NW,
putting the area under a divergent southerly flow. Showers and
thunderstorms are possible across western and central areas.
Heading into Sunday, model solutions begin to diverge in how they
want to handle the evolution of the upper low. But in general, the
upper low is progged to shift east and affect the Northern Rockies
in some form of the other into next week. As such, although the
weather looks to be active into early next week, there remains
much uncertainty in placement and timing of the best precipitation
potential. Details should get clearer as we get closer in time.

High temperatures will range from the 70s Friday through Sunday,
with a few locations possibly approaching 80 degrees on Saturday.
Slightly cooler conditions are possible by early next week as the
aforementioned upper low affects the region with highs in the 50s
and 60s forecast. Low temperatures will range from the 30s to 40s
most nights. STP



Mainly VFR conditions will prevail through the period with
generally light winds overnight. Expect winds to increase a little
out of west to northwest with speeds 10 to 15 kts. With the
recent precipitation, can`t rule out some patchy ground fog
localized mainly in the valleys overnight, but low confidence in
impacts to terminals. STP/Reimer



    Wed     Thu     Fri     Sat     Sun     Mon     Tue
BIL 033/068 035/064 039/076 045/080 049/073 041/062 037/058
    00/U    30/U    00/U    01/U    12/W    43/W    43/W
LVM 030/063 032/063 038/076 038/075 040/069 031/058 032/055
    00/U    60/U    00/U    02/T    33/W    54/W    43/W
HDN 031/069 036/065 037/078 044/082 050/075 042/064 037/060
    00/U    40/U    00/U    01/U    12/W    33/W    33/W
MLS 034/068 036/062 038/074 043/078 050/075 045/062 038/057
    00/U    10/U    00/U    00/U    11/B    32/W    33/W
4BQ 032/068 037/059 037/072 041/077 050/074 044/060 037/055
    00/U    20/U    00/U    00/U    11/B    12/W    33/W
BHK 032/066 035/059 036/071 043/075 050/073 045/063 036/055
    00/U    10/U    00/U    00/U    01/B    11/B    33/W
SHR 028/067 034/060 035/074 040/079 046/073 042/063 035/057
    00/U    51/U    00/U    01/U    12/W    22/W    43/W




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