Weather Service Report


128 
FXUS65 KBYZ 230150
AFDBYZ

Area Forecast Discussion...Updated
National Weather Service Billings MT 
750 PM MDT Wed Sep 22 2021

.UPDATE...

Just a quick update for temperature and wind trends. Pre-frontal
trof is located from NC Montana southwestward into the Billings
area and over to Livingston. Winds have shifted northwesterly to
the west of the trof. Main cold front is moving into western
Montana at this time and will push through the area from west to
east in the overnight hours. Some light rain/snow showers will be
possible in the mountains, otherwise just some increased cloud
cover and elevated northwest winds expected with the frontal
passage into tomorrow. Looking at very pleasant temperatures in 
the lower 70s for Thursday, plan a lunch picnic. Chambers

&&

.DISCUSSION...

Rest of Today through Friday Night...

Temperatures are on track to continue rising into the low 80s this
afternoon. A relatively strong pressure gradient over the
mountains ignited some weak gap flow that had Livingston area
gusting up to 40 mph this morning, but should die down this
evening as the cold front makes its way through us. This dry 
front still looks to swing through overnight, and likely not
provide much of an increase in winds. Although staying dry,
temperatures will be cooler tomorrow, and northwest winds will
have some speeds in the east up to 20 mph as 850 mb winds will be
30-35 kts, and low-level should mix out to at least that level. 
Cooler temperatures will stick around for Friday, with highs only 
reaching mid 60s to low 70s from east to west. Vertz

Saturday through Wednesday...

Upper ridging will be over the area for the weekend, with temps in
the 80s and RH's in the teens to lower 20s. Most of the clusters
continued the upper ridging on Monday, but the first cluster
showed SW flow ahead of the next Pacific trough. Still looking at
dry weather with similar temps/RH's to the weekend's readings.
Models vary with the speed of the Pacific trough through the
remainder of the period. Area will generally be under a dry SW
flow on Tuesday, with NBM bringing a slight chance of
thunderstorms over and near the western mountains in the
afternoon. Slight chance of showers spreads further E Tue. night.
A slight chance of showers and thunderstorms continues from KBIL W
on Wednesday, with temps in the upper 60s and 70s, and higher
RH's. Will need to see how this pattern evolves with time due to
variances in the speed of the trough. Arthur

&&

.AVIATION...

VFR will prevail tonight through Thursday with mid and high
clouds. A cold front will cross the area tonight, shifting winds 
to the NW over most of the area. Winds will be gusty Thu. 
afternoon. Chambers


&&

.PRELIMINARY POINT TEMP/POPS...

    Thu     Fri     Sat     Sun     Mon     Tue     Wed     
-----------------------------------------------------------
BIL 051/073 045/071 049/085 053/084 051/085 052/083 050/072
    00/B    00/U    00/U    00/U    00/U    11/B    22/T
LVM 043/071 039/075 044/082 045/082 046/084 047/080 043/069
    10/B    00/U    00/U    00/U    00/U    12/T    33/T
HDN 046/074 043/071 043/085 048/085 048/085 048/085 046/073
    00/B    00/U    00/U    00/U    00/U    01/U    21/B
MLS 050/073 046/066 044/083 051/083 050/084 051/085 052/075
    00/B    00/B    00/U    00/U    00/U    00/U    11/B
4BQ 051/074 048/067 045/083 051/083 051/085 052/087 052/076
    00/B    00/B    00/U    00/U    00/U    00/U    11/B
BHK 048/073 044/065 042/081 050/081 050/084 051/085 051/077
    00/B    00/B    00/U    00/U    00/U    00/U    11/B
SHR 045/073 041/071 042/085 048/083 048/085 049/085 047/074
    01/B    00/U    00/U    00/U    00/U    01/U    21/B

&&

.BYZ WATCHES/WARNINGS/ADVISORIES...
MT...None.
WY...None.

&&

$$
weather.gov/billings

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Western Regional Climate Center, wrcc@dri.edu