Four Square Mile, Colorado 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

603
FXUS65 KBOU 142039
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
239 PM MDT Mon Jul 14 2025

.KEY MESSAGES...

- Warmer today with highs in the mid 90s across the plains.
  Scattered afternoon showers and thunderstorms, mainly over the
  higher elevations.

- Afternoon showers/thunderstorms to continue most days this
  week, with an isolated threat for severe storms over the
  northeastern corner Tuesday. Best chance of rain across the
  plains comes Wednesday.

- High temperatures to linger in the 90s across the plains
  through mid-week.

&&

.DISCUSSION /Through Monday/...
Issued at 202 PM MDT Mon Jul 14 2025

Mountain convection had an early start this morning, with storms
initiating along the Continental Divide around 9AM. Temperatures are
quickly climbing towards convective temperature across the plains,
with multiple observation sites reporting 90+ degrees. As of 11:30
AM (Monday) ACARS soundings are showing just over 500 J/kg of
MLCAPE, large dewpoint depressions, and DCAPE of over 1000 J/kg.
This will be sufficient for thunderstorms to sustain themselves as
they move onto the lower elevations, or for storms to develop once
the convective temp is reached. These storms will be capable of bringing
gusty outflows and dry microbursts between 30-40 mph, with a few
as strong as 50-55 mph. With weak flow aloft, slow moving storms
may bring some localized heavy rainfall (generally over the higher
elevations), but with weak shear in place, storms are not
expected to become severe, however, small hail will be possible.
Cloud cover will help cool temperatures off this evening before
clearing from west to east overnight.

Flow aloft begins to increase on Tuesday as a shortwave moves across
the northern Rockies. At the surface, a lee trough will stretch from
across the plains of Colorado to South Dakota. Forecast soundings
show MLCAPE values near 1000 J/kg with modest amounts of shear (30
to 40 kts) over the northern corner of Colorado in the
afternoon/evening, where dewpoints will be in the 50s. This would
support an isolated severe threat, with large hail and gusty
winds being the main hazards. Elsewhere across the forecast area,
scattered showers and weaker storms will be possible.

A cold front/shortwave combo is expected to bring widespread
precipitation and brief cooldown on Wednesday and Thursday. Some
localized heavy rainfall will be possible as ensembles show PWAT
values between 120-160% of normal from the Continental Divide
eastward. A few stronger storms will be possible along and behind
the front. Temperatures will feel cool compared to the rest of the
week, but still climb into the mid to upper 80s across portions of
the plains, with high 70s for areas along the Wyoming/Nebraska
borders.

By Friday, the ridge reamplifies and temperatures rebound to the
90s across the plains. Ensembles hold 90 degree temperatures
steady for the foreseeable future. A more active pattern will
continue through the forecast period with shortwaves passing
through the upper-level flow, and scattered afternoon showers and
storms will be possible each afternoon.




&&

.AVIATION /18Z TAFS through 18Z Tuesday/...
Issued at 1138 AM MDT Mon Jul 14 2025

Southeasterly winds will prevail the next few hours before
thunderstorms move into the Denver area. Wind direction, then will
likely be determined by outflow direction. Gusts to 25-35 knots
will be likely, with a 20 percent chance for wind gusts to around
45 knots. Storms move off to the east early evening (01-02Z).
Southeast to southerly winds to prevail overnight. Some enhanced
drainage winds will be possible around 06Z with gusts to 25 knots.

For Tuesday, northwest winds are expected to develop 16-18Z and then
continue into the afternoon. The airmass will be drier with fewer
showers and storms. Though there`s about 30 percent at a high based
showers bringing gusty outflow winds during the afternoon.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...Bonner
AVIATION...Meier