Cheyenne, Wyoming 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

669
FXUS65 KCYS 111140
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
540 AM MDT Fri Apr 11 2025

.KEY MESSAGES...

- Well above normal temperatures continue through Saturday with
  dry weather forecasted.

- A cold front will arrive on Sunday dropping temperatures back
  to near climatological average for Sunday and Monday.

&&

.SHORT TERM /THROUGH SATURDAY/...
Issued at 1249 AM MDT Fri Apr 11 2025

Very mild and dry weather will dominate most of the short-term
period as high pressure remains in control over the western
CONUS. Rising heights and warming mid-level temperatures will
result in afternoon highs increasing to around 20 degrees above
normal today in both Wyoming and western Nebraska, with
afternoon highs over 25 degrees above normal on Saturday. Record
high temperatures will be possible on both days, particularly
on Saturday when the ridge axis passes just east into the high
plains. Afternoon winds will remain relatively light on Friday,
with southwesterly flow increasing on Saturday afternoon in the
Wyoming high country ahead of an approaching cold front.

The Saturday evening forecast remains the only slight challenge
in the short-term. Height falls will spread southward ahead of
the cold front/trough lurking just to the north over the
northern high plains. As mid-level moisture increases ahead of
this system, a few isolated convective updrafts may develop in
the higher terrain of the Laramie Range and head east into
Converse and Niobrara counties in east-central Wyoming. This
scenario is portrayed in the longer-range CAM guidance
including both the NAM Nest and FV3 HREF members. Isolated gusty
winds and perhaps a rumble of thunder would accompany any very
high-based convection that can form, which would take place in
the 0z-5z timeframe Saturday evening.

&&

.LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...
Issued at 300 PM MDT Thu Apr 10 2025

Starting Saturday evening, an upper wave trough will
be pushing through the Rocky mountains to give us some light
precipitation chances Sunday. The parent low pressure system will be
descending into the Northern Plains Sunday producing a cold front
that will push southward through the Intermountain West. This cold
front looks to help us saturate at the lower levels allowing for
some precipitation to reach the surface. Instead of being a more
stratiform rainfall this currently has the looks to be more showery
in nature meaning its going to be hard to determine how much rain
will actually fall to the ground at each location. The winds look to
increase Sunday behind the cold front to give us some potentially
elevated winds for our wind prone areas. Also behind the cold front,
the Intermountain West will be in northwest flow allowing for a
cooler airmass to descend down from Canada. This cooler airmass will
knock temperatures into the 50`s with overnight temperatures in the
20`s and 30`s Sunday and Monday. Tuesday, An upper level ridge
begins to build over the West coast and shifting eastward to the
Rocky Mountains. The 700mb pressure gradient will tighten giving us
another potentially windy day Tuesday and Wednesday but doesn`t
currently look like any high wind headlines may be needed. Our in-
house high wind algorithm isn`t showing any excitement past the
Sunday elevated wind event which currently meets our expectations
for next weeks weather pattern.

&&

.AVIATION /12Z TAFS THROUGH 12Z SATURDAY/...
Issued at 537 AM MDT Fri Apr 11 2025

VFR will dominate at all sites today with sunny skies and light
winds. Expect clear skies overnight with overnight winds
following drainage patterns. Another day of VFR and sunny skies
expected on Saturday.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.

&&

$$

SHORT TERM...MAC
LONG TERM...MM
AVIATION...MAC