606 
FXUS65 KBOU 091925
AFDBOU

Area Forecast Discussion
National Weather Service Denver/Boulder CO
125 PM MDT Fri Oct 9 2026

.KEY MESSAGES...

- Unseasonably warm through at least Sunday.

- Mainly dry weather continues, with only isolated to 
  scattered showers (15-30% coverage) and a couple weak storms 
  over the mountains through Sunday. Any precipitation would be 
  light.

- Elevated fire weather conditions as southwest breezes 
  increase, especially by Saturday.

- Pattern change next week, with cooler temperatures 
  finally arriving by Tuesday. Main precipitation chances hold off
  until the middle of next week, but even then much uncertainty.

&&

.DISCUSSION /Through Friday/...
Issued at 125 PM MDT Fri Oct 9 2026

Satellite imagery shows a weak shortwave trough near the 
Utah/Colorado border. This combined with developing cumulus clouds
over the mountains and limited moisture, means isolated high- 
based showers are still on track for this afternoon and early 
evening. On Saturday, the ridging that's been over the region will
finally transition southeastward and be centered over the 
Southern Plains. Southwest flow aloft will prevail behind the 
ridge and ahead of an upper level trough over the Pacific 
Northwest. Warm temperatures will continue Saturday. Due to the 
increasing flow aloft, breezy southwest winds are expected for 
Saturday. Like the past few days, isolated to scattered high-based
showers are expected over the mountains, with light precipitation
amounts at most. 

The upper level trough dives south across the western states 
Sunday and Monday while remnants from Hurricane Rachel lift north 
across the Desert Southwest and Great Basin. Widespread rain is 
expected across the Great Basin and Desert Southwest, even 
reaching parts of western Colorado. However, models are in good 
agreement that any precipitation associated with the upper level 
trough and remnants of Hurricane Rachel will stay well west of the
forecast area. The mountains could see isolated to scattered 
showers Sunday due to increased moisture and instability. 
Temperatures will stay well above normal Sunday with highs in the 
upper 70s to mid 80s. Come Monday, the temperature forecast 
becomes highly uncertain over northeast Colorado. Surface low 
pressure deepens over southeast Colorado and drags a backdoor cold
front into northeast Colorado. The timing of this front will 
impact Monday's temperature forecast. The NAM indicates an early 
arrival for the cold front over the northeast plains with 
temperatures struggling to reach 60F. Meanwhile, the ECMWF is 
slower and shows temperatures reaching the mid 80s over the 
northeast plains. 

For Tuesday through Friday, precipitation timing and chances 
remain uncertain due to model differences regarding the placement 
and track of the ejecting upper level low. Latest trends suggest a
slower eastward progression of the trough. Thus, Tuesday is 
looking drier. Temperatures will be cooler and closer to normal 
with highs in the mid 60s to lower 70s over northeast Colorado. 
Given the 12Z GFS and ECMWF, Tuesday night through Wednesday night
is on track to be the best time period for precipitation as the 
upper level low begins to lift across the region. There is still 
tremendous model uncertainty for Thursday and Friday. Models agree
cooler air will remain over the western states with temperatures 
at or slightly below normal. As far as precipitation chances go, 
low PoPs in the forecast seem on track given the large amount of 
uncertainty.

&&

.AVIATION /18Z TAFS through 18Z Saturday/...
Issued at 1120 AM MDT Fri Oct 9 2026

VFR conditions expected through the TAF period. A weak shear zone
is starting to become evident along the foothills to the west of 
KBJC. Winds are rather uncertain for this afternoon due to a 
potential cyclone and/or shear zone. The forecast calls for mainly
a southerly component at KDEN and KAPA with winds about 10-15 kts
this afternoon. A shear zone looks to continue to develop 
somewhere over the Denver metro later this afternoon. Therefore, 
we expect mainly a northerly component at KBJC. The shear zone 
could introduce northerly winds into KDEN during the late 
afternoon and/or early evening if it were to move to the east. 
Winds could also briefly gust to 15-20 kts at times this 
afternoon.

Tonight, winds turn to an elevated drainage of 8 to 12 kts. Winds
should start to turn clockwise towards the west by early Saturday
afternoon. Only a few to sct mid- and high-level clouds are
possible through the period.

&&

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

&&

$$

DISCUSSION...BM
AVIATION...MV