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000
FXUS65 KBYZ 240257
AFDBYZ

Area Forecast Discussion...Updated
National Weather Service Billings MT
857 PM MDT Sat Sep 23 2017

.UPDATE...

The jet over the Bighorn Mountains and the central zones is
producing a slightly heavier band of precip than the current
grids suggested, so have raised PoPs across Sheridan and Big Horn
counties to likely through midnight. Otherwise, given the cool
low temperatures and recent rainfall, areas from Billings and
Hardin west will still see areas of fog overnight. Reimer

&&

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

Will continue to see cool unsettled conditions over the next
couple of days as upper trof slowly shifts northeast and fills in.
Best chance for precipitation will be tonight into tomorrow east
of a Miles City to Sheridan line as stronger jet dynamics slice
across the region. Expect up to half an inch of additional
accumulation in these areas, while further west periods of mainly
drizzle are expected with brief areas of rain pass through. After
midnight expect areas of locally dense fog to develop over areas
that are not seeing high precipitation chances, with the fog
continuing into tomorrow morning. Issued a Winter Weather Advisory
for the Bighorn mountains for 4 to 8 inches of snow, mainly above
7500 feet for tonight through tomorrow. Otherwise any snow
accumulation tonight will amount to a dusting in the foothills.

Expect improving conditions from west to east Sunday afternoon
through Monday. Temperatures will be mainly in the 45 to 55 range
tomorrow, bumping about 5 degrees with more sun on Monday.
Precipitation chances will continue to decrease through the period
as well, with Monday looking generally pretty nice for early fall.
Chambers

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


A few lingering showers are possible across eastern areas on
Tuesday as an upper low lifts off to the north and east into the
Dakotas. High pressure then looks to build over the Northern
Rockies for the remainder of the long term. A weak wave moving
through northwest flow Wednesday night may bring a few showers to
the area, otherwise mainly dry conditions can be expected through
the coming week. A gradual warming trend will bring high
temperatures in the 60s to 70s most days with lows in the 30s and
40s. STP
&&

.AVIATION...

IFR to MVFR conditions will persist through the remainder of the
night. Lowest cigs and vsbys can be expected for areas along and
east of a KSHR to KMLS line where rain from an approaching
disturbance will continue to fall. Patchy fog will be possible as
well with plenty of moisture near the surface from recent
precipitation. Mountains will be obscured. STP/TWH

&&

.PRELIMINARY POINT TEMP/POPS...

    Sun     Mon     Tue     Wed     Thu     Fri     Sat
-----------------------------------------------------------
BIL 040/049 039/057 041/065 043/065 044/065 043/069 045/072
    32/R    12/R    11/B    11/B    11/U    00/U    00/U
LVM 032/050 031/056 035/061 035/063 037/065 037/067 040/068
    22/O    11/U    11/B    11/B    10/U    00/U    00/U
HDN 041/050 039/056 038/066 041/067 042/067 041/070 042/074
    63/R    22/R    11/B    11/B    11/U    00/U    00/U
MLS 042/050 041/055 040/064 042/067 043/064 041/068 044/074
    83/R    22/R    21/B    11/B    11/U    00/U    00/U
4BQ 041/046 040/052 038/062 040/066 041/064 040/066 043/072
    86/R    33/R    21/B    11/B    11/B    00/U    00/U
BHK 043/048 040/052 040/061 040/065 041/061 038/063 042/071
    95/R    33/R    22/W    01/B    11/U    00/U    00/U
SHR 038/044 037/050 035/060 036/063 038/064 038/067 040/071
    65/O    33/R    21/B    11/B    11/U    10/U    01/U

&&

.BYZ WATCHES/WARNINGS/ADVISORIES...
MT...None.
WY...Winter Weather Advisory in effect until 6 PM MDT Sunday FOR
      ZONE 98.

&&

$$
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