Security-Widefield, Colorado 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

251
FXUS65 KPUB 260801
AFDPUB

Area Forecast Discussion
National Weather Service Pueblo CO
201 AM MDT Tue May 26 2026

.KEY MESSAGES...

- Cooler and wetter today, with scattered to numerous showers
  and thunderstorms.

- Drier over most of the mountains Wednesday, still cool and wet
  eastern mountains and plains with shower/storms continuing.

- Warmer and drier Thurs/Fri, still a low chance of
  thunderstorms across the eastern mountains and plains.
  Increased fire danger expected across the San Luis Valley, as
  winds ramp up.

- Still some hints of potentially cooler and wetter weather for
  the weekend into early next week, though confidence remains
  rather low in the timing and coverage of precipitation.

&&

.SHORT TERM /THROUGH WEDNESDAY/...
Issued at 1240 AM MDT Tue May 26 2026

Weak upper low near the 4 corners early this morning, while
significant s/w trough was generating widespread convection over
e-se NM as it slowly rotates northward around the low. For
today, 4 corners upper low weakens and lifts northward across
CO, while s/w trough over ern NM slowly drifts northward as well.
Overall, expect a continued upturn in convective coverage and
strength across the region as low level moisture increases
under slowly strengthening upward motion through the day, and
several CAMs, especially the HRRR, show waves of showers and
thunderstorms rotating northward into the evening. CAPE
(500-1000 J/KG) should be sufficient for at least a few stronger
storms, with pockets of heavy rain and small hail possible. Max
temps a few degf cooler at many locations with increasing clouds
and moisture.

Main question for tonight and Wednesday revolves around how
strong will the ern NM upper wave/low be as it rotates northward
into ern CO Wed morning. Several 26/00z deterministic models
show a rather pronounced circulation developing, with enhanced
low/mid level easterly winds forcing widespread precip on the
plains Wed morning, then scattered thunderstorms along the
eastern mountains/I-25 corridor Wed afternoon/evening as upslope
and instability generate some mainly weak convection. NBM has
begun to trend toward a cooler/wetter solution, though not as
dramatic as some late arriving model guidance would suggest. For
now, stuck fairly close to NBM on temps, but nudged up precip
chances from I-25 eastward, as consensus seems to be forming
that low/mid level upslope will deepen through the day. Farther
west over/near the Continental Divide, drier and warmer conditions
develop, with enough wind for some pockets of enhanced fire
danger, especially in the San Luis Valley.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
Issued at 1240 AM MDT Tue May 26 2026

Upper low lifts into the nrn Rockies Thu/Fri, with dry and
warmer conditions developing across srn CO. Again, enhanced fire
danger will be possible both days in/near the San Luis Valley,
as winds gust to around 25 mph in the afternoon. On the plains,
still some model/ensemble disagreement on how far east low
level moisture gets pushed, with at least a few solutions
suggesting areas along/east the mountains may hold on to enough
moisture/instability for convection both days, though confidence
in any particular solution remains rather low. NBM guidance
looks potentially a little overdone with pops given the amount
of drying over the mountains, but only made some minor tweaks to
pops at this point.

Omega block upper pattern persists over the U.S. during the
weekend into next week, with a good deal of model/ensemble
variability regarding timing and strength of upper energy
lifting northward across the Rockies into Canada on the west
side of the blocking ridge. Doesn`t help that both GFS/ECMWF
26/00z deterministic models have lost some run-to run
continuity regarding s/w timing and precipitation coverage over
the weekend, as latest runs are much drier than 24 hrs ago. In
general, pattern favors the eastern mountains and plains for
shower/thunderstorm chances, as occasional surges of higher
dewpoint air push westward toward the mountains while upward
motion is provided by a series of hard-to-time short waves.
Blended guidance looks as good as anything at this point, so
will roll with the NBM pops for now.

&&

.AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/...
Issued at 1116 PM MDT Mon May 25 2026

Outside of possible thunderstorm chances, VFR conditions are
expected at all three TAF sites, KCOS, KPUB, and KALS, for the next
24 hours. Showers remain possible over and near KALS through much of
the early morning hours, so have left mention of low end chances
through at least 14Z. Ceilings could briefly drop to MVFR heights
during showers as well. For KCOS and KPUB, Southerly and
southeasterly winds continue through the overnight, with chances for
showers and thunderstorms returning from 21Z into the early evening
hours, and chances were high enough (around 30%) to include a
mention in both the KCOS and KPUB TAFs. Gusty and variable
winds will be possible with showers and thunderstorms in the
area tomorrow, and visibilities may briefly drop to MVFR during
a heavier shower or storm.

&&

.PUB WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

SHORT TERM...PETERSEN
LONG TERM...PETERSEN
AVIATION...EHR