Moose, Wyoming Weather Forecast Discussion

314
FXUS65 KRIW 140944
AFDRIW
Area Forecast Discussion
National Weather Service Riverton WY
344 AM MDT Sun Sep 14 2025
.KEY MESSAGES...
- Partly to mostly sunny today, with mild September
  temperatures.
- Next weather system sweeps across the state starting tonight,
  bringing more showers and thunderstorms for Monday into
  Tuesday.
- Temperatures begin to cool around midweek, with some low lying
  areas west of the divide approaching freezing.
&&
.DISCUSSION...
Issued at 209 AM MDT Sun Sep 14 2025
The broad trough continues to slowly try to shift east, with
multiple embedded impulses rotating through it. The latest wave
is sweeping into western Nebraska/South Dakota this morning,
with some wraparound precip trying to form back into Natrona
County. This precip has been very light, if reaching the ground
at all, and will quickly exit back to the east by midmorning.
The gap between systems today will allow most areas to see
partly to mostly sunny skies and warm temperatures back into the
70s and lower 80s.
WV imagery shows the next weather system currently coming ashore
across Oregon. This system will come rotating around the bottom
of the trough and into western WY late tonight, spreading the
next round of showers and thunderstorms into the region. Models
continue to bring this trough eastward, then stalling it across
western WY through Tuesday. This will continue the high
likelihood of showers and thunderstorms into Tuesday. With the
overarching trough nudging eastward as this arrives, the
remaining portion of the smaller system then shunts southward
late Tuesday and Tuesday night. This also brings modest
northerly flow behind it, bringing slightly cooler air into the
state. Temperatures will cool enough to approach near freezing
west of the divide in lower valleys and basins Tuesday night.
&&
.AVIATION /12Z TAFS THROUGH 12Z MONDAY/...
Issued at 341 AM MDT Sun Sep 14 2025
Mainly dry weather with VFR conditions are expected through
around the next 18 hours. There will be a bit more wind than
yesterday with gusts to around 20 knots possible in vicinity of
KCPR, KRKS, KPNA and KBPI. The next weather system will approach
from the west and bring the next chance of rain showers to KJAC,
KPNA and KBPI after 06Z Monday. Showers will likely spread to
all terminals but will do so after 12Z Monday.
&&
.RIW WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION...Straub
AVIATION...Hattings

NWS RIW Office Area Forecast Discussion