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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1126 AM MST Fri Dec 13 2019

COZ030>051-141830-
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-
1126 AM MST Fri Dec 13 2019

...STRONG WINDS AND HEAVY SNOW IN THE MOUNTAINS THROUGH
SATURDAY...

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

.DAY ONE...This Afternoon and Tonight

A Winter Storm Warning remains in effect in the north central
Colorado mountains from today through 11 PM MST Saturday night.
Pacific moisture being brought into the state by a strong jet
stream aloft will continue producing snow in the mountains through
today and tonight. Snow will be decreasing this afternoon and this
evening, before snowfall rates increase rapidly after midnight.
Could see 1 to 1.5 inches per hour fall after midnight. Accumulations
of 3 to 8 inches of new snow are expected to fall today and
another 5 to 10 inches may fall tonight before sunrise. Strong
winds will also continue over higher elevations and passes with
gusts as high as 60 MPH at times. Blowing and drifting snow will
reduce visibilities and could make travel difficult. Snow
accumulations will be lighter in the valleys of Grand and Jackson
counties. Travel in the mountains through this weekend is expected
to be adversely impacted.

Avalanche danger is considerable to high due to the wind loading
of snow. Backcountry enthusiasts should check the local avalanche
forecast before planning to go out.

On the plains, windy conditions are expected to develop as the
strong flow over the state is mixed down to the surface. West to
northwest winds are expected to increase to 30 to 40 MPH by this
afternoon along with some higher gusts at times. The gusty winds
may produce some patches of blowing dust at times. Winds will
decrease during the evening.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Moderate to heavy snowfall will be ongoing Saturday morning and
will last through late Saturday evening in the mountains. Travel
will be hazardous due to snow rates between one to two inches per
hour along with blowing snow and gusty winds. The plains and urban
corridor will see a chance for light snow but little or no accumulation
is expected Saturday.

Another system will move through Colorado during the day on Sunday
lasting through Sunday night. This system will bring moderate snow
mainly to the central and southern mountains of Colorado while the
far northern mountains will see light amounts. Light to moderate
snow will fall across the urban corridor and plains with heavier
amounts farther south. Amounts across the Denver metro will be
between 1-4 inches.

There are no hazardous weather conditions expected Monday through
Thursday.

.SPOTTER INFORMATION STATEMENT...

Snowfall reports from spotters will be appreciated.

$$



Winter Storm Warning

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
436 AM MST Sat Dec 14 2019

...SNOW, BLOWING SNOW, AND DIFFICULT TRAVEL CONDITIONS IN THE
MOUNTAINS THROUGH TONIGHT...

.Snow has increased in coverage and intensity this morning as
another upper level disturbance has brought Pacific moisture to
the area. The snow will be heavy at times through this evening
with snowfall rates up to two inches per hour.

Travel in the Colorado high country will be difficult through
tonight. There should be a decrease in snow by midnight, although
some light snow showers could linger through much of Sunday. If
you are planning to travel through the Colorado mountains this
weekend, check cotrip.org often for the latest road conditions and
be prepared for extremely difficult travel conditions.

Some snow will also spread onto portions of the adjacent plains
on Sunday.

COZ031-033-034-142345-
/O.CON.KBOU.WS.W.0018.000000T0000Z-191215T0600Z/
Rabbit Ears Pass-
Rocky Mountain National Park and the Medicine Bow Range-
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, Rabbit Ears Pass, Cameron Pass,
Laramie and Medicine Bow Mountains, Rabbit Ears Range,
Rocky Mountain National Park, Willow Creek Pass, Berthoud Pass,
Breckenridge, East Slopes Mosquito Range,
East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks,
Kenosha Mountains, Mount Evans, Williams Fork Mountains,
and Winter Park
436 AM MST Sat Dec 14 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM MST THIS
EVENING...

* WHAT...Heavy snow. Additional snow accumulations of 6 to 12
  inches. Winds gusting as high as 45 mph.

* WHERE...The Mountains of Summit County, the Mosquito Range,
  and the Indian Peaks, Rocky Mountain National Park and the
  Medicine Bow Range and Rabbit Ears Pass.

* WHEN...Until 11 PM MST this evening.

* IMPACTS...Travel could be very difficult. Areas of blowing snow
  could significantly reduce visibility, especially in open areas
  and over the high mountain passes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$



Avalanche Warning

COZ010-012-034-151545-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
AVALANCHE WARNING
COLORADO AVALANCHE INFORMATION CENTER
RELAYED BY NATIONAL WEATHER SERVICE DENVER/BOULDER CO
737 AM MST FRI DEC 13 2019

THE FOLLOWING MESSAGE IS TRANSMITTED AT THE REQUEST OF THE
COLORADO AVALANCHE INFORMATION CENTER.

AVALANCHE WARNING FOR THE CAIC VAIL AND SUMMIT COUNTY, ASPEN, AND
GUNNISON ZONES

* TIMING...Beginning 6:00 AM Friday December 13. Expires at 7:00 AM
  Sunday December 15.

* AFFECTED AREA... Williams Fork Mountains, Ten Mile Range, Gore
  Range, Vail, Elk Mountains, Basalt, Red table, Hardscrabble, Ruby
  Range, and West elk Mountains

* AVALANCHE DANGER...The avalanche danger is HIGH (Level 4 of 5).
  Avalanches large enough to bury a person are likely today. You can
  trigger avalanches from the bottom of slopes or from a distance.
  If you trigger an avalanche it will break deep in the snowpack and
  will be large and very dangerous.

* REASON... Intense snowfall and strong winds will result in very
  dangerous avalanche conditions.

* PRECAUTIONARY/PREPAREDNESS ACTIONS...Travel in avalanche terrain
  is not recommended.

 Consult www.colorado.gov/avalanche for detailed information.

Cooperstein

$$



Avalanche Watch

COZ004-013-031-033-034-058-060-061-082-141515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
AVALANCHE WATCH
COLORADO AVALANCHE INFORMATION CENTER
RELAYED BY NATIONAL WEATHER SERVICE DENVER/BOULDER CO
700 AM MST FRI DEC 13 2019

THE FOLLOWING MESSAGE IS TRANSMITTED AT THE REQUEST OF THE
COLORADO AVALANCHE INFORMATION CENTER.

An Avalanche Watch is in effect for the CAIC Steamboat and Flat
Tops, Front Range,and Sawatch zones

* TIMING...Dangerous avalanche conditions are developing. Expect
  very dangerous avalanche conditions by Saturday.

* AFFECTED AREA...Park range, Elk Head, Rabbit ears Pass, Flat Tops,
  Medicine Bow, Never Summer, Front Range, Pikes Peak, Mosquito
  range, and Sawatch Range

* AVALANCHE DANGER...The avalanche danger rating is expected to
  reach HIGH (Level 4) on Saturday.

* REASON...Heavy snowfall and strong winds will increase the
  avalanche danger. Large avalanches will become very easy to
  trigger. During periods of heavy snowfall avalanches will release
  naturally.

* PRECAUTIONARY/PREPAREDNESS ACTIONS...Travel in or under avalanche
  terrain is not recommended on Saturday as heavy snow accumulates.
  Plan ahead for rapidly increasing avalanche danger.

 Consult www.colorado.gov/avalanche for detailed information.

Cooperstein

$$




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