Evergreen, Colorado Weather Forecast Discussion

079
FXUS65 KBOU 072007
AFDBOU
Area Forecast Discussion
National Weather Service Denver/Boulder CO
207 PM MDT Sun Sep 7 2025
.KEY MESSAGES...
-  Better chance for storms across the plains through early
   evening. A couple storms could be strong/severe over the far
   eastern plains.
- High based isolated showers/storms Monday. Very little to no
  rainfall, but gusty winds of 40-50 mph possible.
- Better chances for showers/storms (and rainfall) mid to late
  next week.
&&
.DISCUSSION /Through Sunday/...
Issued at 207 PM MDT Sun Sep 7 2025
Scattered showers and thunderstorms will continue to track
eastward across the area. Brief moderate to heavy rain and winds
to 40 mph will be possible with most of this activity. Across far
eastern Colorado, better moisture and instability will reside east
of a surface trough and may lead to a couple strong to briefly
severe thunderstorms through the early evening hours.
Upper level ridging slides east over Colorado for Monday. This
will bring warmer and slightly drier air with it. Models in good
agreement showing very little rainfall, but the hi-res models show
high-based showers and a few weak storms Monday afternoon. So we
likely see isolated showers/storms with very little to no rainfall
and gusty outflow winds of 40-50 mph. Temperatures trend warmer
as well with highs in the mid to upper 80s over northeast
Colorado.
The ridge slowly slides east of the state Tuesday with southwest
flow aloft prevailing behind through Thursday and beyond. This
will keep temperatures above normal with highs in the mid to upper
80s over northeast Colorado. Would not be surprised if we end up
seeing a few low 90s as well. Precipitable water values are
slightly above normal ranging from 0.75 (in) to one inch over the
plains. Enough moisture for isolated/scattered showers and
thunderstorms. There is an uptick in moisture for Thursday along
with a shortwave trough. This is expected to lead to better
chances for showers and thunderstorms.
For Friday and next weekend, the upper level ridge off to the
east amplifies and stretches into the Great Lakes and possibly
into Canada. This will start to block the flow aloft to the west
across western North America. Models generally show some sort of
an upper level longwave trough or closed low over western Canada
and the northwest part of the country. A lot of uncertainty what
the main pattern will look like. Colorado should be at the base of
whatever trough/low that forms off to the northwest. This is
expected to keep temperatures at or above normal. Precipitation
chances will depend on the amount of moisture that is able make it
into the region. Southwest flow aloft could transport desert air
into the area, so will generally keep PoPs in the 10-30 percent
range at this time.
&&
.AVIATION /18Z TAFS through 18Z Monday/...
Issued at 1136 AM MDT Sun Sep 7 2025
VFR conditions to prevail through today, tonight, and Monday. The
main weather concern will be for isolated to scattered showers
and thunderstorms with variable and gusty outflow winds from
roughly 21Z- 02Z. We`ll continue with the Prob30 in that period
since coverage should be relatively limited, but sufficient DCAPE
for VRB G30- 35kts. Winds will remain light west to variable
through 19Z and then transition to diurnal northeasterlies after
19Z. Then convection will likely mess with the winds 21Z-02Z
before settling back to SE 02Z-05Z and then SSW by ~06Z.
For Monday, a typical diurnal wind pattern is expected with
southwest winds weakening and then turning northerly during the
late morning hours (15-18Z). High based showers will be possible
after 21Z Monday with gusty outflow winds the main impact.
&&
.BOU WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION...Meier
AVIATION...Meier

NWS BOU Office Area Forecast Discussion