Van Tassell, Wyoming Weather Forecast Discussion

314
FXUS65 KCYS 270807
AFDCYS
Area Forecast Discussion
National Weather Service Cheyenne WY
207 AM MDT Sat Sep 27 2025
.KEY MESSAGES...
- An upper-level ridge keeps the region drier today through the
  weekend with temperatures warming back into the 70s and 80s.
- Breezy conditions return to the Nebraska Panhandle on Sunday,
  along with increasing precipitation chances.
&&
.SHORT TERM /THROUGH SUNDAY NIGHT/...
Issued at 206 AM MDT Sat Sep 27 2025
Another calm night tonight with only a few lower-level clouds over
portions of Albany and Laramie counties. Overall, quiet weather
expected again today as the upper-level trough departs the region
and ridging takes over once more. 700mb temperatures will be in the
9 to 10 C range today, leading to surface temperatures in the low-
70s to low-80s across the region. Mostly clear skies are expected,
though a few clouds may move in for a few hours. Precipitation is
not expected today with the synoptic-scale subsidence under the
ridge.
On Sunday, the next upper-level system begins to push into the
region, leading to a wind shift to the southwest and more favorable
conditions for isolated to scattered showers. Southerly surface flow
on Sunday will advect in enough moisture to increase the chances for
precipitation, though significant rainfall is not expected at this
time. Cloudier skies are expected with the push of moisture into the
region, but ample sunshine will still be present for much of the
region. In addition to precipitation chances, breezy winds are
likely as southerly 700mb flow increases with increasing height
gradients across much of the Panhandle. Gusts to around 30mph are
possible.
&&
.LONG TERM /MONDAY THROUGH FRIDAY/...
Issued at 215 PM MDT Fri Sep 26 2025
At the start of the long term, an upper level trough and associated
low over southern California will eject energy north into our CWA,
this coupled with GFS Omega fields indicating upward motion in the
atmosphere will increase chances of precipitation and the potential
of isolated thunderstorms for Sunday afternoon. This threat will
primarily be west of Cheyenne, mainly affecting our western forecast
zones that include Laramie, Arlington, and Rawlins. More of the same
on Monday, a trough pushes north through our CWA which increases
precipitation chances briefly during the late morning into the early
afternoon hours which will affect a similar area as the day before.
However, the expanse this time will cover more of the CWA and
include Cheyenne. Overall, chances of precipitation decreases
thereafter for the remainder of the forecast period. Pleasant
temperature at the start with highs in the mid 60s to lower 70s for
areas west of I-25 and the mid 70s to mid 80s east of the corridor,
with the warmest temperature across the Nebraska Panhandle. As we
progress through the long term period, we will see gradually cooler
temperatures each day and by Friday, expect highs to top out in the
mid 60s to mid 70s, with the warmest temps still across the Nebraska
Panhandle. Winds in general wont be much of a concern as gusts will
top out to near 30 mph, possibly stronger in a few isolated areas
especially the windier prone areas.
&&
.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 1100 PM MDT Fri Sep 26 2025
Winds have quieted down this evening and will remain mostly
light and variable for most of the overnight hours. After
sunrise, winds begin to increase again, with gusts between 20
and 25 kts possible throughout the day. Mostly clear skies
prevail again with limited to no precipitation chances.
&&
.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.
&&
$$
SHORT TERM...AM
LONG TERM...RZ
AVIATION...AM

NWS CYS Office Area Forecast Discussion