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Winter Weather Advisory 0021
Issued by the Denver / Boulder Forecast Office

Action Issued Starts Expiration
New 2026-11-03 23:44:21 2026-11-04 15:00:00 2026-11-05 03:00:00
Continued 2026-11-04 05:54:07 2026-11-04 15:00:00 2026-11-05 03:00:00
Continued 2026-11-04 15:46:35 2026-11-05 03:00:00
Cancelled 2026-11-05 02:16:53 2026-11-05 03:00:00


Action: New
Issued At: 2026-11-03 23:44:21

364 
WWUS45 KBOU 040544
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
1044 PM MST Tue Nov 3 2026

COZ034-037-042200-
/O.NEW.KBOU.WW.Y.0021.261104T2100Z-261105T0900Z/
South and Southeast Grand/West Central and Southwest
Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties
Above 9000 Feet-Central and Southeast Park County-
Including the cities of Fairplay, East Slopes Southern Gore Range,
Indian Peaks, Lake George, Mount Blue Sky, Breckenridge, Winter Park,
Berthoud Pass, Eisenhower Tunnel, Williams Fork Mountains, South
Park, East Slopes Mosquito Range, Hartsel, and Kenosha Mountains
1044 PM MST Tue Nov 3 2026

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 PM WEDNESDAY TO 2 AM MST
THURSDAY...

* WHAT...Snow expected. Total snow accumulations between 3 and 10
  inches with localized higher amounts possible for the Mosquito
  Range.

* WHERE...The Mountains of Summit County, the Mosquito Range, and the
  Indian Peaks, and South Park.

* WHEN...From 2 PM Wednesday to 2 AM MST Thursday.

* IMPACTS...Travel could be difficult. Roads will become slippery in
  spots, including for the US 285 corridor. The hazardous conditions
  will impact the Wednesday evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road conditions
for Colorado can be obtained by calling 5 1 1 or by going to
www.cotrip.org.

&&

$$

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

MV


Action: Continued
Issued At: 2026-11-04 05:54:07

548 
WWUS45 KBOU 041153
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
453 AM MST Wed Nov 4 2026

COZ034-037-042200-
/O.CON.KBOU.WW.Y.0021.261104T2100Z-261105T0900Z/
South and Southeast Grand/West Central and Southwest
Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties
Above 9000 Feet-Central and Southeast Park County-
Including the cities of Berthoud Pass, Williams Fork Mountains,
Winter Park, Lake George, Breckenridge, Indian Peaks, South Park,
East Slopes Southern Gore Range, Kenosha Mountains, Fairplay, East
Slopes Mosquito Range, Mount Blue Sky, Hartsel, and Eisenhower Tunnel
453 AM MST Wed Nov 4 2026

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON
TO 2 AM MST THURSDAY...

* WHAT...Snow expected. Total snow accumulations between 3 and 10
  inches with localized higher amounts possible for the Mosquito
  Range.

* WHERE...The Mountains of Summit County, the Mosquito Range, and the
  Indian Peaks, and South Park.

* WHEN...From 2 PM this afternoon to 2 AM MST Thursday.

* IMPACTS...Travel could be difficult. Roads will become slippery in
  spots, including for the US 285 corridor. The hazardous conditions
  will impact the Wednesday evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road conditions
for Colorado can be obtained by calling 5 1 1 or by going to
www.cotrip.org.

&&

$$

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

RPK


Action: Continued
Issued At: 2026-11-04 15:46:35

491 
WWUS45 KBOU 042146
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
246 PM MST Wed Nov 4 2026

COZ034-037-050900-
/O.CON.KBOU.WW.Y.0021.000000T0000Z-261105T0900Z/
South and Southeast Grand/West Central and Southwest
Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties
Above 9000 Feet-Central and Southeast Park County-
Including the cities of Lake George, Winter Park, Kenosha Mountains,
Eisenhower Tunnel, East Slopes Mosquito Range, Fairplay, Hartsel,
Berthoud Pass, Breckenridge, East Slopes Southern Gore Range,
Williams Fork Mountains, Mount Blue Sky, Indian Peaks, and South Park
246 PM MST Wed Nov 4 2026

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 AM MST
THURSDAY...

* WHAT...Snow expected. Total snow accumulations between 2 and 8
  inches with localized higher amounts possible for the Mosquito
  Range.

* WHERE...The Mountains of Summit County, the Mosquito Range, and the
  Indian Peaks, and South Park.

* WHEN...Until 2 AM MST Thursday.

* IMPACTS...Travel could be difficult. Roads will become slippery in
  spots, including for the US 285 corridor. The hazardous conditions
  will impact the Wednesday evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road conditions
for Colorado can be obtained by calling 5 1 1 or by going to
www.cotrip.org.

&&

$$

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

Danielson


Action: Cancelled
Issued At: 2026-11-05 02:16:53

388 
WWUS45 KBOU 050816
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
116 AM MST Thu Nov 5 2026

COZ034-037-050930-
/O.CAN.KBOU.WW.Y.0021.000000T0000Z-261105T0900Z/
South and Southeast Grand/West Central and Southwest
Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties
Above 9000 Feet-Central and Southeast Park County-
Including the cities of Williams Fork Mountains, Winter Park, South
Park, East Slopes Southern Gore Range, Kenosha Mountains, Hartsel,
Fairplay, Berthoud Pass, Breckenridge, Mount Blue Sky, Eisenhower
Tunnel, Lake George, East Slopes Mosquito Range, and Indian Peaks
116 AM MST Thu Nov 5 2026

...WINTER WEATHER ADVISORY IS CANCELLED...

The heaviest snowfall has ended across the advisory area. Some light
snow will be possible over the next 2 hours for far southern Park
County with minimal additional accumulation. Be alert for slick spots
into Thursday morning, including the US 285 corridor.

$$

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

MV



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