High Wind Warning 8, NWS Denver/Boulder, CO

411 
WWUS75 KBOU 102301
NPWBOU

URGENT - WEATHER MESSAGE
National Weather Service Denver CO
401 PM MST Wed Dec 10 2025

COZ033>035-111800-
/O.CON.KBOU.HW.W.0008.000000T0000Z-251211T1800Z/
South and East Jackson/Larimer/North and Northeast
Grand/Northwest Boulder Counties Above 9000 Feet-South and
Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear
Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer
and Boulder Counties Between 6000 and 9000 Feet-
Including the cities of East Slopes Southern Gore Range, Glendevey,
Williams Fork Mountains, Rocky Mountain National Park, Indian Peaks,
Laramie and Medicine Bow Mountains, Berthoud Pass, Winter Park, Red
Feather Lakes, East Slopes Mosquito Range, Willow Creek Pass, Cameron
Pass, Nederland, Eisenhower Tunnel, Kenosha Mountains, Estes Park,
Rabbit Ears Range, Breckenridge, and Mount Blue Sky
401 PM MST Wed Dec 10 2025

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 11 AM MST THURSDAY...

* WHAT...West winds 30 to 40 mph with gusts up to 80 mph expected.

* WHERE...Rocky Mountain National Park and the Medicine Bow Range,
  The Mountains of Summit County, the Mosquito Range, and the Indian
  Peaks, and The Northern Front Range Foothills.

* WHEN...Until 11 AM MST Thursday.

* IMPACTS...Damaging winds will blow down trees and power lines.
  Power outages are expected. Travel will be difficult, especially
  for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

&&

$$

For more information from the National Weather Service, visit
https://weather.gov/bou

Hiris

840 
WWUS75 KBOU 111049
NPWBOU

URGENT - WEATHER MESSAGE
National Weather Service Denver CO
349 AM MST Thu Dec 11 2025

COZ033>035-111800-
/O.CON.KBOU.HW.W.0008.000000T0000Z-251211T1800Z/
South and East Jackson/Larimer/North and Northeast
Grand/Northwest Boulder Counties Above 9000 Feet-South and
Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear
Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer
and Boulder Counties Between 6000 and 9000 Feet-
Including the cities of Red Feather Lakes, Nederland, Rocky Mountain
National Park, Willow Creek Pass, Indian Peaks, Williams Fork
Mountains, Winter Park, Kenosha Mountains, Berthoud Pass, Eisenhower
Tunnel, Glendevey, Laramie and Medicine Bow Mountains, Mount Blue
Sky, East Slopes Southern Gore Range, East Slopes Mosquito Range,
Cameron Pass, Breckenridge, Rabbit Ears Range, and Estes Park
349 AM MST Thu Dec 11 2025

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 11 AM MST THIS
MORNING...

* WHAT...West winds 30 to 40 mph with gusts around 75 mph.

* WHERE...Rocky Mountain National Park and the Medicine Bow Range,
  The Mountains of Summit County, the Mosquito Range, and the Indian
  Peaks, and The Northern Front Range Foothills.

* WHEN...Until 11 AM MST this morning.

* IMPACTS...Damaging winds will blow down trees and power lines.
  Power outages are expected. Travel will be difficult, especially
  for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People are urged to secure loose objects that could be blown around
or damaged by the wind.

&&

$$

For more information from the National Weather Service, visit
https://weather.gov/bou

22

653 
WWUS75 KBOU 111748
NPWBOU

URGENT - WEATHER MESSAGE
National Weather Service Denver CO
1048 AM MST Thu Dec 11 2025

COZ033>035-111900-
/O.EXP.KBOU.HW.W.0008.000000T0000Z-251211T1800Z/
South and East Jackson/Larimer/North and Northeast
Grand/Northwest Boulder Counties Above 9000 Feet-South and
Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear
Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer
and Boulder Counties Between 6000 and 9000 Feet-
Including the cities of Estes Park, Glendevey, Eisenhower Tunnel,
Rocky Mountain National Park, Winter Park, Red Feather Lakes,
Nederland, East Slopes Mosquito Range, Kenosha Mountains, Indian
Peaks, Rabbit Ears Range, Laramie and Medicine Bow Mountains, Willow
Creek Pass, Breckenridge, Berthoud Pass, Mount Blue Sky, Williams
Fork Mountains, East Slopes Southern Gore Range, and Cameron Pass
1048 AM MST Thu Dec 11 2025

...HIGH WIND WARNING WILL EXPIRE AT 11 AM MST THIS MORNING...

Recent observations across the high country have shown wind gusts
decreasing this past hour. For this reason, we will allow the High
Wind Warning to expire at 11 AM. However, gusts up to 70 mph are
still possible at the highest elevations and in our wind-prone areas
for the next couple of hours.

$$

For more information from the National Weather Service, visit
https://weather.gov/bou

MAI

Area Forecast Discussion
National Weather Service Denver/Boulder CO
1253 AM MST Wed Dec 10 2025

.KEY MESSAGES...

- Strong winds will continue across the mountains, foothills and
  Cheyenne Ridge through the afternoon with gusts 55-75 mph. Winds
  will diminish these evening and retreat to the higher terrain.

- Northern mountains will see a few inches of snow accumulation
  tonight into Wednesday, with occasionally slick conditions
  possible for passes surrounding Jackson/Grand Counties.

- Another chance for strong winds along the Front Range mountains
  Wednesday evening into Thursday morning, with brief and
  localized gusts up to 70-80 mph at times.

&&

.SHORT TERM /Through Wednesday/...
Issued at 237 PM MST Tue Dec 9 2025

Downslope winds have peaked across the Front Range, after a very
windy morning which saw widespread gusts 70-95 mph across the
foothills and leeward Front Range mountains. Breezy conditions
will still persist well through the afternoon and evening
however, with localized wind-prone spots still carrying potential
to reach high wind criteria for a few more hours. Will thus
continue the current suite of headlines, although these may be
able to be dropped early as the strongest winds recede back into
the high country.

Tonight, a backdoor cold front will bring a shift to lighter
northeast flow to the plains, and a few low clouds to the lower
elevations as well into early Wednesday morning. Moisture looks
much too shallow to support any meaningful precipitation chances
for the lower elevations. That's not the case for our northern
mountains, where we'll see a reinforcement of moisture and
westerly flow aloft. As such, snow showers should first develop
late this evening, increasing overnight into Wednesday morning,
and tapering off rather quickly in the evening. Accumulations will
be focused over the Park and Medicine Bow Ranges with 1-5" mainly
above 10,000 ft. Slick conditions can be expected at times over
Rabbit Ears and Cameron Passes, with a much lower probability of
any impacts to passes closer to the I-70 corridor.

Ridgetop winds will remain quite robust during daytime hours
Wednesday, so higher elevations will continue to see gusts 45-65
mph with patchy blowing snow, but these shouldn't extend much
beyond those most susceptible leeward slopes.

&&

.LONG TERM /Wednesday night through Tuesday/...
Issued at 237 PM MST Tue Dec 9 2025

Wind speeds may pick up again over the high country Wednesday
evening and continue overnight and possibly into Thursday morning.
However, confidence is decreasing in a widespread high wind event
across the Front Range mountains. Looking at upper level flow, we
are progged to generally be in the right exit region of the jet
stream Wednesday night, with cross-barrier flow of 40-50 kts. There
is good agreement between models of decent QG fields across the
northeastern part of the state, promoting subsidence aloft. But,
recent model runs show that flow aloft has turned more northwest and
decreased slightly. In addition, forecasted surface pressure
gradients between Grand Junction and Denver have decreased to 10-
13mb. With cross-sections and modeled soundings indicating a weak
stable layer and some shear at higher levels, the high country
likely would only see brief and localized wind gusts between 70-80
mph, with the wind-prone areas across the foothills and adjacent
plains seeing gusts up to 45 mph. For that reason, have opted out
for a High Wind Watch for now, but will continue to monitor for any
changes.

West/northwesterly winds will gradually decrease during the day on
Thursday. With compressional heating, daytime temperatures could be
10-20 degrees above normal across the plains. Exactly how warm we
will get will depend on the strength and duration of the downsloping
winds. Generally expect widespread temperatures in the mid 60s, with
the possibility of high 60s/low 70s across the eastern plains.

Thursday and into the weekend, we will see a drying trends across
our forecast area as an upper level ridge continues to build over
the southwestern United States. An arctic airmass will dip into
the eastern part of our country on Friday, which will likely
bring temperatures back to seasonal normals for our eastern
plains. However, ensemble solutions still indicate that the areas
closer to the foothills will reach up to the high 50s. For the
weekend, temperatures will stay above normal as the upper level
ridge shifts over Colorado.

Ensemble guidance has continued to show a weak shortwave traversing
the region at the beginning of next week. Without much forcing
associated with this disturbance, only light orographic snow showers
are expected for the high country at this time.

&&

.AVIATION /06Z TAFS through 06Z Thursday/...
Issued at 1156 PM MST Tue Dec 9 2025

A cold front has gone through all the terminals and winds have
shifted to the northeast. This front brought enough moisture
behind it that stratus clouds have formed at BJC and APA that may
last until 10-11Z. Ceilings will be around 1,000-1,500 feet. Winds
will return to a light drainage or light and variable at all
terminals for the rest of the night.

Winds are expected to stay light throughout the morning hours due
to a lack of mixing. By the afternoon, warmer air aloft along with
the sunshine may be able to create stronger mixing. This would
bring down gusty westerly winds at all terminals. Gusts could
reach 40 knots at BJC and 35 knots at DEN. However, there is
considerable uncertainty with this since the models often over do
the mixing. So light and variable winds may continue through much
of the afternoon at all terminals.

By the evening on Wednesday, confidence is growing that westerly
winds will become persistent at the terminals with gusts up to 25
knots.

&&

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

&&

SHORT TERM...BRQ
LONG TERM...MAI
AVIATION...Danielson

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1041 AM MST Tue Dec 9 2025

COZ030>051-101745-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
1041 AM MST Tue Dec 9 2025

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

Strong winds gusting 65 to 80 mph will continue to impact much of
the leeward slopes, foothills, and northern plains along the
Wyoming state line through this afternoon, before diminishing this
evening. Winds will remain breezy overnight in the high country,
but should fall below high wind criteria by midnight for almost
all locations. The northern mountains, especially the Park Range
and Medicine Bow Range, will see light snow develop this evening
and continue through Wednesday afternoon. A few inches of
accumulation may make conditions slick on Rabbit Ears Pass and
Cameron Pass.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Strong winds return Wednesday afternoon into Thursday morning,
with gusts up to 70 mph possible at times across the high
country. Wind-prone areas could see gusty winds as well along the
foothills.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.