Sidney, Nebraska 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

917
FXUS65 KCYS 100538
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
1135 PM MDT Mon Jun 9 2025

.KEY MESSAGES...

- Above average temperatures are expected Tuesday, and again
  Thursday through Sunday.

- Showers and thunderstorms will return to the region Wednesday
  through Friday and possibly into the weekend, mainly in the
  afternoon and evening hours.

&&

.SHORT TERM /THROUGH TUESDAY/...
Issued at 345 PM MDT Mon Jun 9 2025

A dry, subsident airmass is settling in across the region this
afternoon, supporting mainly clear skies today. The only exception
is a few afternoon cumulus over Carbon county and in the higher
terrain, but blue sky prevails elsewhere. Expect clear skies to
continue through the night with the north to northwest breeze
decoupling around sundown.

The axis of the ridge will shift overhead on Tuesday, boosting 700-
mb temperatures to around +12 to +15C across the area. Highs will
push into the 80s to low 90s, roughly 10F above average for this
time of year. Soundings show deep mixed layers setting up across the
area during the day, but with less subsidence aloft, we should
see a bit more afternoon cloud cover compared to today. We will
likely see a few afternoon showers/storms, but this may be more
virga than anything with very isolated coverage. Forcing will
increase heading into Tuesday evening as a vort-max rides along
a stalled frontal boundary just to our north. Overrunning lift
will tap into some elevated instability and increase the
coverage of scattered showers and thunderstorms Tuesday evening
into early Wednesday morning. This will be focused along a
modest frontal boundary that will push across the area from the
northwest. The front and any showers/storms will have the
potential to produce locally gusty winds.

The post frontal environment on Wednesday will push a slightly
cooler and more moist airmass southwest across the High Plains.
There is some model disagreement regarding exactly where this
boundary will set up, but lately, these back door frontal setups
have been stronger than depicted by most models. As a result,
nudged highs down slightly for Wednesday while keeping dewpoints
fairly high. Increased low level moisture will be in place
underneath stronger forcing as a more powerful upper level
shortwave approaches from the west. Expect to see scattered
thunderstorms developing in southeast Wyoming where the capping
inversion is weaker. Steep lapse rates and marginal shear
suggest the potential for a few strong to severe thunderstorms.
While the cap over Nebraska will likely be eroding through the
afternoon and evening hours, storms may struggle once they get
to the state line. Therefore, PoPs are a little lower but still
present Wednesday afternoon and evening for the Nebraska
panhandle.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/...
Issued at 345 PM MDT Mon Jun 9 2025

Thursday...A progressive shortwave trough aloft moves from northeast
Wyoming in the morning, to the central Dakotas by evening. Looks
like adequate low and mid level moisture for isolated to widely
scattered showers and thunderstorms in the afternoon and evening,
mainly east of I-25. 700 mb temperatures near 15 Celsius will yield
high temperatures mainly in the 80s.

Friday...A weak low amplitude ridge aloft prevails, though with a
cold frontal boundary across our eastern counties, and adequate
moisture, we should again see isolated to widely scattered showers
and thunderstorms in the afternoon and evening, mainly east of I-25.

Saturday-Sunday...Ridging aloft prevails and with 700 mb
temperatures near 17-19 Celsius producing warm temperatures aloft
and convective inhibition, only widely scattered evening showers and
thunderstorms look possible east of a Lusk to Kimball line. High
temperatures in the mid 80s to lower 90s.

Monday...A weak cold frontal passage will drop maximum temperatures
back into the lower to mid 80s. Adequate low and mid level moisture
will help produce isolated to widely scattered late day showers and
thunderstorms east of I-25.

&&

.AVIATION /06Z TAFS THROUGH 12Z WEDNESDAY/...
Issued at 1135 PM MDT Mon Jun 9 2025

Upper level ridge will continue to build over the area tonight
and Tuesday, resulting in mostly clear skies and relatively light
winds. A weak cool front will push south out of Canada later
on Tuesday.

HAZARDS/WEATHER TRENDS: VFR conditions are expected over the next 24
hours. Winds will gradually shift into the south or southeast
Tuesday morning, but should remain light. 10% to 20% chance of
showers and thunderstorms for KCDR Tuesday evening as the weak cool
front moves south, but less than a 10% chance for thunder for all
other terminals. Won`t include in TAFs for now due to low
confidence.

&&

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

&&

$$

SHORT TERM...MN
LONG TERM...RUBIN
AVIATION...TJT