Area Forecast Discussion
Issued by NWS Billings, MT

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FXUS65 KBYZ 132130

Area Forecast Discussion
National Weather Service Billings MT
330 PM MDT Sun May 13 2018

.SHORT TERM...valid for Mon and Tue...

Upper-low currently centered over southern Idaho will continue to
advect weak energy and moisture into the region bringing scattered
showers through this evening. Showers will push over the Plains
and become less in coverage by this evening. Warming and drying
trend expected to start the week. A ridge moves into the area
bumping temperatures into the 70s Monday and near 80 by Tuesday.
PoP chances will remain low in most places aside from some stray
daytime showers/thunderstorms in the mountains. As temperatures
rise and snowmelt increases in the mountains, rises are expected
along the Clarks Fork of the Yellowstone by late in the week.

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

Wednesday begins with upper ridging and generally dry weather
across the lower elevations and scattered rain showers in the
mountains. Then an upper trough over the western U.S. should
slowly move eastward and allow for scattered showers and
thunderstorms across the region Wednesday afternoon into the

The pattern shifts a bit for Thursday into next weekend. An upper
ridge builds over southwest Canada, which will release a cold
front from the north Thursday afternoon for an increased chance of
convection. 850mb temperatures fall to 2-9C Friday (which is
pretty impressive this time of year) as high pressure builds over
eastern MT and northeasterly winds advect cooler air into the
region. That would lead to much cooler temperatures for Friday and
Saturday, with a good chance of showers.

High pressure shifts to the central Plains on Sunday, allowing
low-level winds to turn southwesterly and bring warmer air back to
the region. Enough instability should be around for scattered
showers and thunderstorms.

High temperatures will be in the 70s and lower 80s Wednesday and
Thursday, then drop to the 50s and lower 60s for Friday, and 60s
to near 70 for next weekend. RMS



For tonight, it will be mostly cloudy with scattered showers and
isolated thunderstorms for local MVFR conditions. Otherwise, VFR
conditions will prevail. The mountains will be obscured. TWH/RMS



    Mon     Tue     Wed     Thu     Fri     Sat     Sun
BIL 045/071 046/079 051/081 053/079 049/058 043/062 043/071
    21/B    11/U    12/T    34/T    67/T    53/T    22/T
LVM 042/067 041/076 044/075 047/071 045/058 039/060 039/068
    22/T    13/W    24/T    47/T    67/T    54/T    35/T
HDN 045/072 046/080 051/082 053/082 049/059 044/064 043/073
    21/B    11/U    12/T    34/T    66/W    53/T    22/T
MLS 050/073 050/079 054/082 056/080 051/061 044/063 044/070
    21/B    10/U    02/T    24/T    55/W    42/T    11/B
4BQ 046/069 048/077 053/080 054/080 051/062 044/060 042/068
    22/T    11/U    12/T    24/T    46/T    53/T    11/B
BHK 045/070 046/075 050/080 054/075 049/061 041/062 041/067
    21/B    11/U    02/T    24/T    45/W    42/W    11/U
SHR 041/064 042/076 046/077 049/076 048/059 042/059 041/068
    23/T    22/W    23/T    25/T    56/T    54/T    22/T




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