Sheridan, Wyoming 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

317
FXUS65 KBYZ 041559
AFDBYZ

Area Forecast Discussion...Updated
National Weather Service Billings MT
959 AM MDT Fri Apr 4 2025

.KEY MESSAGES...

- Chances for light snow will taper off W and S of Billings
  through the day.

- High confidence of building high pressure this weekend; expect
  warmer and dry conditions this weekend into next week.

&&

.UPDATE...

Forecast area was under the N portion of an upper trough this
morning. Combination of weak N upslope flow from 850-700 mb and
lift from the trough was producing areas of light snow/flurries SW
and S of KBIL. This snow could be seen on area web cams under
radar echoes. Used combination of GFS and NamDNG to spread more
low PoPs into these areas into this evening. Remainder of forecast
was in good shape. Arthur

&&

.DISCUSSION...
Today through Saturday night...

A trough axis at 500 mb will swing southeastward across our area
this morning, and should be located from about southeast MT to
Sheridan County, WY by noon MDT. Southeast/ahead of this trough
axis, weak large-scale ascent with some modest enhancement from
700 mb frontogenesis should support additional light snow early
this morning, especially in areas favored during events when the
wind has a northerly component...so mainly areas near and south of
I-90 and in southeast MT. Additional snow amounts in these areas
should be light with generally less than one inch in most places
but 1-2 inches in the Beartooth, Red Lodge and Sheridan Foothills
and in southern Powder River and Carter Counties. Road conditions
will be slippery especially in the areas that receive the greater
snowfall amounts, though a few slick spots are possible outside of
these areas too.

As the 500 mb trough axis slides southeastward and exits the area
today, much of the snow will diminish by 6 AM MDT. However, there
will be enough instability within northwesterly 500 mb flow
behind the trough axis to produce isolated snow showers (15%
chance) in southeast MT, mainly east of Rosebud County, this
afternoon. These snow showers will only produce very light snow
amounts of a trace or so.

A 500 mb ridge will then dominate our weather from tonight
through this weekend with dry and increasingly warmer conditions.
Sky conditions should be mostly clear, as we should be lacking the
westerly flow in the upper levels that tends to facilitate a
cloud deck downstream of the mountains.

High temperatures will generally be in the upper 30s to lower 40s
today then upper 40s to middle 50s Saturday. Low temperatures will
be in the 20s for most places tonight but teens in parts of
southeast MT, Park County MT and Sheridan County WY. Saturday
night will be a bit warmer, with low temperatures in the 20s and
30s. RMS


Sunday through Friday...

Throughout the weekend, and into the start of the work week, a
very high amplitude ridge will build in across the Western half of
North America in a quasi rex-block setup. Temps will rise well
above average with many parts of the CWA seeing highs in the 70`s
on Monday.

Tuesday there is a little shortwave that could move through the
area. There is some disagreement on timing and strength but there
is a decent chance for some thundershowers to develop, especially
over the eastern half of the CWA, with very good diffluence aloft
ahead of the trough. This does hinge on the timing of the
enhanced rising motion as if it arrives a little later Tuesday
night into Wednesday, the chances for convection are slim to none.
Regardless, another few inches of snow are possible for the
mountains across western parts of the CWA.

After the shortwave quickly exits, the prominent ridge takes back
over the entirety of the west. As a result, high temperatures
will rapidly rebound back to 15-20F above average for the
remainder of the work week.
WMR
&&

.AVIATION...


16Z Update:

Periodic, light snow showers will diminish through the morning
for KLVM and KSHR. VFR conditions will persist through the period.
TS
&&

.PRELIMINARY POINT TEMP/POPS...

    Tdy Sat     Sun     Mon     Tue     Wed     Thu
-------------------------------------------------------
BIL 044 026/057 034/066 037/072 043/067 041/063 039/071
    1/B 00/U    00/U    00/U    24/W    33/W    11/B
LVM 041 022/054 031/062 036/069 039/061 038/057 036/070
    2/S 10/U    00/U    01/N    25/W    33/W    11/B
HDN 044 023/056 030/065 033/071 041/066 039/063 037/070
    1/B 10/U    00/U    00/U    24/W    44/W    10/B
MLS 042 024/054 031/063 033/068 040/067 040/063 041/067
    0/B 00/U    00/U    00/U    12/W    22/W    10/U
4BQ 039 023/052 030/061 032/065 040/064 040/062 041/066
    1/B 00/U    00/B    00/U    13/W    32/W    10/U
BHK 039 019/050 027/060 027/058 032/064 035/060 036/064
    1/B 00/U    00/B    00/U    12/W    22/W    10/U
SHR 039 017/051 026/061 029/070 036/063 035/060 033/068
    4/S 10/U    00/U    00/U    14/W    34/W    10/U

&&

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

&&

$$
weather.gov/billings