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Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1103 AM MST SAT DEC 20 2014

COZ030>051-210615-
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-
1103 AM MST SAT DEC 20 2014

...POWERFUL WINDS AND HEAVY SNOWFALL ON THE WAY FOR THE MOUNTAINS
OF NORTHERN COLORADO SUNDAY AFTERNOON THROUGH MONDAY EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

AREAS OF LIGHT SNOW WILL CONTINUE OVER THE MOUNTAINS THIS
AFTERNOON AND INCREASE TONIGHT. ACCUMULATIONS OF UP TO 4 INCHES
ARE POSSIBLE IN THE HIGHER MOUNTAINS BY SUNDAY MORNING...WITH
LIGHTER AMOUNTS IN NORTH AND MIDDLE PARKS. ON THE PLAINS...IT
WILL BE MOSTLY CLOUDY WITH TEMPERATURES SIMILAR TO FRIDAYS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SNOWFALL IS EXPECTED TO PICK UP IN THE MOUNTAINS OF NORTHERN
COLORADO SUNDAY AFTERNOON AND BECOME QUITE HEAVY SUNDAY NIGHT.
AREAS UP AROUND THE EISENHOWER TUNNEL...THE HIGH MOUNTAIN PASSES
AND NORTHWEST FACING SLOPES ABOVE 9000 FEET COULD SEE SNOWFALL
RATES OF 2 TO 3 INCHES PER HOUR AT TIMES...TOGETHER WITH
SUSTAINED NORTHWEST WINDS OF 25 TO 40 MPH AND GUSTS TO AROUND 70
MPH. THE HEAVY SNOWFALL AND STRONG WINDS WILL LIKELY PRODUCE
WHITEOUT CONDITIONS CREATING TREACHEROUS DRIVING CONDITIONS FOR
HIGH COUNTRY TRAVELERS PARTICULARLY SUNDAY NIGHT AND MONDAY
MORNING. AREAS ABOVE TIMBERLINE AND WEST FACING SLOPES ABOVE 9000
FEET COULD SEE 12 TO 24 INCHES OF SNOW PILE UP BY MONDAY EVENING.
EAST FACING SLOPES AND HIGH VALLEY LOCATIONS ARE LIKELY TO SEE
LIGHTER SNOW TOTALS.

MEANWHILE THERE IS A SLIGHT CHANCE OF SNOW ON THE HIGH PLAINS
SUNDAY NIGHT AND A BETTER CHANCE FOR SNOW ON MONDAY AND MONDAY
EVENING FOLLOWING THE PASSAGE OF A COLD FRONT. SNOW ACCUMULATION
ON THE PLAINS SHOULD BE LIGHT AND ONLY SCATTERED IN COVERAGE.

THERE IS ANOTHER OPPORTUNITY FOR SNOW CHRISTMAS DAY THROUGH
FRIDAY WITH ANOTHER STORM SYSTEM POSSIBLY MOVING DOWN FROM THE
PACIFIC NORTHWEST. THERE IS MUCH UNCERTAINTY IN THE MODELS AS TO
WHEN...WHERE AND HOW MUCH SNOW WILL FALL. THEREFORE...STAY TUNE
FOR LATER UPDATES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

$$
MEIER/BAKER




Winter Storm Warning

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
306 PM MST SAT DEC 20 2014

...WINTER STORM WILL MOVE INTO THE NORTHERN AND NORTH CENTRAL
MOUNTAINS SUNDAY AND CONTINUE THROUGH MONDAY NIGHT....

.A WINTER STORM WILL IMPACT PARTS OF COLORADO BRINGING SNOW AND
WIND TO MOUNTAINS OF CENTRAL AND NORTH CENTRAL COLORADO. COLD
TEMPERATURES...INCREASED MOISTURE AND INSTABILITY WILL AID IN THE
DEVELOPMENT OF SNOW. HIGH WINDS WILL COMBINE WITH SNOW TO REDUCE
VISIBILITIES OVER HIGHER MOUNTAIN PASSES. TRAVELERS WILL NEED TO
USE CAUTION AND CONSIDER ALTERING TRAVEL PLANS SUNDAY AFTERNOON
THROUGH MONDAY.

COZ031-033-034-211100-
/O.CON.KBOU.WS.W.0013.141221T1900Z-141223T0700Z/
WEST JACKSON AND WEST GRAND COUNTIES ABOVE 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-
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...WINTER PARK
306 PM MST SAT DEC 20 2014

...WINTER STORM WARNING REMAINS IN EFFECT FROM NOON SUNDAY TO
MIDNIGHT MST MONDAY NIGHT...

* TIMING...SNOW IS EXPECTED TO DEVELOP SUNDAY MORNING INCREASING
  IN INTENSITY LATE SUNDAY AFTERNOON AND CONTINUE INTO MONDAY
  NIGHT. THE HEAVIEST SNOW IS EXPECTED TO FALL SUNDAY EVENING
  THROUGH MONDAY MORNING.

* SNOW ACCUMULATIONS...12 TO 24 INCHES WILL BE POSSIBLE WITH
  HEAVIER AMOUNTS ON NORTHWEST FACING SLOPES.

* WIND/VISIBILITY...MOUNTAIN TOP WIND GUSTS UP TO 70 MPH WILL BE
  POSSIBLE SUNDAY EVENING THROUGH MONDAY MORNING. THIS WILL
  CAUSE BLOWING AND DRIFTING SNOW. VISIBILITIES OVER THE
  MOUNTAINS AND MOUNTAINS PASSES MAY FALL TO NEAR ZERO AT TIMES.

* IMPACTS...PERSONS PLANNING TRAVEL INTO THE COLORADO HIGH
  COUNTRY SHOULD BE PREPARED FOR DIFFICULT DRIVING CONDITIONS...
  SLOW TRAVEL...SNOW PACKED ROADS...AND POOR VISIBILITY IN
  SPOTS. CHAIN LAWS WILL LIKELY BE REQUIRED FOR SEMI-TRAILERS
  AND BUSES TO TRAVEL OVER HIGHER MOUNTAIN PASSES. HIGH MOUNTAIN
  PASSES COULD BECOME IMPASSABLE DUE TO THE HEAVY SNOW AND
  STRONG WINDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER
CONDITIONS ARE EXPECTED OR OCCURRING.  SIGNIFICANT AMOUNTS OF
SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN
AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...
FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.

&&

$$



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NOAA National Weather Service
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Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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