Winter Storm Warning 15, NWS Denver/Boulder, CO

981 
WWUS45 KBOU 161823
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
1123 AM MST Thu Nov 16 2017

...SNOW RETURNING TO THE MOUNTAINS...

.A Pacific jet stream and moisture plume will combine to produce
accumulating snowfall over the northern Colorado mountains later
tonight through Friday night. Snow is expected to begin falling 
later tonight, and become more widespread during the day on 
Friday. Snow intensity is expected to increase sharply from north 
to south Friday afternoon, reaching the I-70 Mountain Corridor by 
early Friday evening as a strong cold front arrives.

Travel conditions are expected to deteriorate rapidly during this
time, with snow levels quickly dropping to valley floors. Blowing
snow may produce poor visibilities, especially over the high
mountain passes. The heavy snow will decrease from northwest to
southeast late Friday night, with drier conditions expected by
Saturday.

On the plains, scattered rain and snow showers will likely
develop Friday evening, behind the passage of a strong cold front. 
Any snow accumulation on the plains is expected to be light.

COZ031-170230-
/O.CON.KBOU.WS.W.0015.171117T0700Z-171118T1200Z/
Rabbit Ears Pass-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, and Rabbit Ears Pass
1123 AM MST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT
TO 5 AM MST SATURDAY...

* WHAT...Heavy snow expected. Plan on difficult travel conditions,
  especially Friday afternoon and Friday night. Total snow
  accumulations of 10 to 16 inches, with localized amounts up to
  24 inches.

* WHERE...Rabbit Ears Pass.

* WHEN...From midnight tonight to 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 45 mph will 
  cause patchy blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are expected. 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.

$$

COZ033-034-170230-
/O.CON.KBOU.WS.A.0017.171117T0700Z-171118T1200Z/
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 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
1123 AM MST Thu Nov 16 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
LATE FRIDAY NIGHT...

* WHAT...Heavy snow possible. Plan on difficult travel conditions,
  including Friday evening. Damage to trees and power lines is
  possible. Total snow accumulations of 6 to 10 inches, with
  localized amounts up to 18 inches possible.

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

* WHEN...From late tonight through late Friday night.

* ADDITIONAL DETAILS...Winds gusting as high as 50 mph will cause
  patchy blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is potential for significant
snow, sleet or ice accumulations that may impact travel. Continue
to monitor the latest forecasts.

$$

777 
WWUS45 KBOU 162150
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
250 PM MST Thu Nov 16 2017

...SNOW RETURNING TO THE MOUNTAINS...

.A Pacific jet stream and moisture plume will combine to produce
accumulating snowfall over the northern Colorado mountains. Snow 
is expected to begin falling later tonight, and become more 
widespread during the day on Friday. Snow intensity is expected to
increase sharply from north to south Friday afternoon, reaching 
the I-70 Mountain Corridor by late Friday afternoon or early 
Friday evening as a strong cold front arrives. Travel conditions 
will deteriorate rapidly during this time, with snow levels 
quickly dropping to valley floors. Blowing snow may produce poor 
visibilities, especially over the high mountain passes. The heavy 
snow will decrease from northwest to southeast late Friday night, 
with drier conditions expected by Saturday.

On the plains, scattered rain and snow showers will likely
develop by early Friday evening, behind the passage of a strong 
cold front. Any snow accumulation on the plains is expected to be 
light.

COZ033-034-170700-
/O.UPG.KBOU.WS.A.0017.171117T0700Z-171118T1200Z/
/O.EXB.KBOU.WS.W.0015.171117T1200Z-171118T1200Z/
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 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
250 PM MST Thu Nov 16 2017

...WINTER STORM WARNING IN EFFECT FROM 5 AM FRIDAY TO 5 AM MST
SATURDAY...

* WHAT...Heavy snow and blowing snow expected. Plan on difficult
  travel conditions, with the most difficult travel spreading
  south into the mountain I-70 Corridor and Summit County by late
  Friday afternoon or early evening. Total snow accumulations of 
  6 to 10 inches, with localized amounts up to 18 inches, are 
  expected.

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

* WHEN...From 5 AM Friday to 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 50 mph will 
  cause areas of blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow and blowing snow means severe
winter weather conditions are expected. 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.

$$

COZ031-170700-
/O.CON.KBOU.WS.W.0015.171117T0700Z-171118T1200Z/
Rabbit Ears Pass-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, and Rabbit Ears Pass
250 PM MST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT
TO 5 AM MST SATURDAY...

* WHAT...Heavy snow and blowing snow expected. Plan on difficult
  travel conditions late tonight through Friday. Total snow 
  accumulations of 7 to 12 inches, with localized amounts up to 24
  inches, are expected.

* WHERE...Rabbit Ears Pass.

* WHEN...From midnight tonight to 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 45 mph will 
  cause areas of blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow and blowing snow means severe
winter weather conditions are expected. 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.

$$

283 
WWUS45 KBOU 170414
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
914 PM MST Thu Nov 16 2017

...SNOW RETURNING TO THE MOUNTAINS...

.A Pacific jet stream and moisture plume will combine to produce
accumulating snowfall over the northern Colorado mountains. Snow
is expected to begin falling later tonight, and become more
widespread during the day on Friday. Snow intensity is expected
to increase sharply from north to south Friday afternoon,
reaching the I-70 Mountain Corridor by late Friday afternoon or
early Friday evening as a strong cold front arrives. Travel
conditions will deteriorate rapidly during this time, with snow
levels quickly dropping to valley floors. Blowing snow may
produce poor visibilities, especially over the high mountain
passes. The heavy snow will decrease from northwest to southeast
late Friday night, with drier conditions expected by Saturday.

On the plains, scattered rain and snow showers will likely
develop by early Friday evening, behind the passage of a strong
cold front. Any snow accumulation on the plains is expected to be
light.

COZ031-171300-
/O.CON.KBOU.WS.W.0015.171117T0700Z-171118T1200Z/
West Jackson and West Grand Counties Above 9000 Feet-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, and Rabbit Ears Pass
914 PM MST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT
TO 5 AM MST SATURDAY...

* WHAT...Heavy snow and blowing snow expected. Plan on difficult 
  travel conditions late tonight through Friday. Total snow 
  accumulations of 7 to 12 inches, with localized amounts up to 
  24 inches, are expected. 

* WHERE...Rabbit Ears Pass.

* WHEN...From midnight tonight to 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 45 mph will 
  cause areas of blowing and drifting snow. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow and blowing snow means severe
winter weather conditions are expected. 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.

$$

COZ033-034-171300-
/O.CON.KBOU.WS.W.0015.171117T1200Z-171118T1200Z/
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 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
914 PM MST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 AM FRIDAY TO
5 AM MST SATURDAY...

* WHAT...Heavy snow and blowing snow expected. Plan on difficult 
  travel conditions, with the most difficult travel spreading 
  south into the mountain I-70 Corridor and Summit County by 
  late Friday afternoon or early evening. Total snow 
  accumulations of 6 to 10 inches, with localized amounts up to 
  18 inches, are expected. 

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

* WHEN...From 5 AM Friday to 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 50 mph will 
  cause areas of blowing and drifting snow. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow and blowing snow means severe
winter weather conditions are expected. 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.

$$

089 
WWUS45 KBOU 171053
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
353 AM MST Fri Nov 17 2017

...SNOW TO INCREASE OVER THE MOUNTAINS...

.A Pacific jet stream and moisture plume will combine to produce
accumulating snowfall over the northern Colorado mountains today
through this evening. Snow intensity is expected to increase 
sharply from north to south this afternoon, reaching the I-70 
Mountain Corridor by late afternoon or early evening as a strong 
cold front arrives. Travel conditions will deteriorate rapidly 
during this time, with snow levels quickly dropping to valley 
floors. Blowing snow may produce poor visibilities, especially 
over the high mountain passes. The heavy snow will decrease from 
northwest to southeast late tonight, with drier conditions 
expected by Saturday.

On the plains, scattered rain and snow showers will likely
develop by early evening, behind the passage of a strong cold 
front. Any snow accumulation on the plains is expected to be 
light.

COZ031-171900-
/O.CON.KBOU.WS.W.0015.000000T0000Z-171118T1200Z/
Rabbit Ears Pass-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, and Rabbit Ears Pass
353 AM MST Fri Nov 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
SATURDAY...

* WHAT...Heavy snow and blowing snow occurring. Plan on difficult
  travel conditions, including during the evening commute.
  Additional snow accumulations of 7 to 12 inches, with localized
  amounts of 18 to 23 inches, are expected.

* WHERE...Rabbit Ears Pass.

* WHEN...Until 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 45 mph will 
  cause areas of blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow and blowing snow means severe
winter weather conditions are occurring. 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.

$$

COZ033-034-171900-
/O.CON.KBOU.WS.W.0015.171117T1200Z-171118T1200Z/
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 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
353 AM MST Fri Nov 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
SATURDAY...

* WHAT...Heavy snow expected. Plan on difficult travel conditions,
  including during the evening commute. Total snow accumulations
  of 6 to10 inches, with localized amounts up to 20 inches, are 
  expected.

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

* WHEN...Until 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 45 mph will cause
  areas of blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are expected. 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.

$$

242 
WWUS45 KBOU 171909
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
1209 PM MST Fri Nov 17 2017

...SNOW TO CONTINUE OVER THE MOUNTAINS...

.A Pacific jet stream and moisture plume will combine to produce
accumulating snowfall over the northern Colorado mountains today
through this evening. Snow intensity is expected to increase
sharply from north to south this afternoon, reaching the I-
70 Mountain Corridor by late afternoon or early evening as a
strong cold front arrives. Travel conditions will deteriorate
rapidly during this time, with snow levels quickly dropping to
valley floors. Blowing snow may produce poor visibilities,
especially over the high mountain passes this afternoon and
evening. The heavy snow will decrease from northwest to southeast
late tonight, with drier conditions expected by Saturday.

On the plains, scattered rain and snow showers will likely
develop by early evening, behind the passage of a strong cold
front. Any snow accumulation on the plains is expected to be
light.

COZ031-180415-
/O.CON.KBOU.WS.W.0015.000000T0000Z-171118T1200Z/
Rabbit Ears Pass-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, and Rabbit Ears Pass
1209 PM MST Fri Nov 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
SATURDAY...

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions, including during the evening commute. Additional 
  snow accumulations of 5 to 8 inches, with localized amounts up 
  to 13 inches, are expected.

* WHERE...Rabbit Ears Pass.

* WHEN...Until 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 50 mph will 
  cause patchy blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are occurring. 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.

$$

COZ033-034-180415-
/O.CON.KBOU.WS.W.0015.000000T0000Z-171118T1200Z/
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 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
1209 PM MST Fri Nov 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
SATURDAY...

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions, including during the evening commute. Additional 
  snow accumulations of 4 to 7 inches, with localized amounts up 
  to 13 inches, are expected.

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

* WHEN...Until 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 50 mph will 
  cause patchy blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are occurring. 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.

$$

916 
WWUS45 KBOU 180257
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
757 PM MST Fri Nov 17 2017

...WINTER STORM MOVING OUT OF THE MOUNTAINS OVERNIGHT...

.A strong Pacific jet stream and cold front that brought heavy 
snow to the northern Colorado mountains this afternoon and early 
evening will continue to drop southeast overnight. The heaviest 
snow has ended, but light to moderate snowfall will continue much
of the night. The burst of heavy snow created wintry travel
conditions across most mountain areas, with some road closures
including Interstate 70. Conditions should improve overnight,
though some roads will likely remain icy in the morning. Travelers
should check for updates on road conditions and closures by
monitoring local media, calling 5 1 1, or visiting 
www.cotrip.org.

COZ031-181200-
/O.CON.KBOU.WS.W.0015.000000T0000Z-171118T1200Z/
Rabbit Ears Pass-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, and Rabbit Ears Pass
757 PM MST Fri Nov 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
SATURDAY...

* WHAT...Snow occurring. Plan on difficult travel conditions. 
  Additional snow accumulations of 2 to 4 inches are expected.

* WHERE...Rabbit Ears Pass.

* WHEN...Until 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 45 mph will 
  cause patchy blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are occurring. 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.

$$

COZ033-034-181200-
/O.CON.KBOU.WS.W.0015.000000T0000Z-171118T1200Z/
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 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
757 PM MST Fri Nov 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST
SATURDAY...

* WHAT...Snow occurring. Plan on difficult travel conditions. 
  Additional snow accumulations of 2 to 4 inches are expected.

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

* WHEN...Until 5 AM MST Saturday.

* ADDITIONAL DETAILS...Winds gusting as high as 50 mph will 
  cause patchy blowing and drifting snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions are occurring. Consider delaying travel until later 
tonight or Saturday morning when conditions will be improving. 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.

$$

Gimmestad

829 
WWUS45 KBOU 181014
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
314 AM MST Sat Nov 18 2017

COZ031-033-034-181115-
/O.CAN.KBOU.WS.W.0015.000000T0000Z-171118T1200Z/
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
314 AM MST Sat Nov 18 2017

...WINTER STORM WARNING IS CANCELLED...

The winter storm has moved out of the area. Scattered light snow 
showers will continue through early morning, with additional 
local accumulations up to an inch possible. 

$$

Area Forecast Discussion
National Weather Service Denver/Boulder CO
407 AM MST Thu Nov 16 2017

.SHORT TERM...(Today and tonight)
Issued at 333 AM MST Thu Nov 16 2017

The day will start out dry and mild beneath a passing upper level
ridge, with lowest humidity values along the east face of the
Front Range--the product of downslope flow. Sunshine and a warm
southwest flow aloft should have little problem pushing afternoon
temperatures up into the low/mid 70s on the plains, with warmest
readings in areas exposed to gusty west-southwest winds such as
along the base of the southern foothills and over the Palmer
Divide. Dry fuels, unseasonably warm temps, gusts to around 20 mph
and min RHs down around 15 pct will create high fire danger
conditions for a few hours this afternoon specifically in eastern
Douglas, Elbert and Lincoln counties where we could see pockets of
active rangeland fire behavior, but not enough activity or
intensity to warrant a red flag warning. In the high country,
specially north of I-70, mid and high clouds will be on the increase
through the day as a powerful (150-160kt) Pacific jet stream
transports a plume of moisture rich maritime air towards Colorado.

Models show this jet and its accompanying moisture slipping south
over the northern mtns and high valleys overnight, with scattered
to numerous rain/snow showers developing over higher elevations
after midnight. Snow level will start out high up around 10,000
feet msl in the evening, then lower to around 9000 feet msl by
morning. A strengthening west-southwest flow overnight will favor
the Park and Gore Ranges where upwards of 4 inches of wet snow
could pile up on windward slopes and high passes by morning. Snow
amounts in mtn areas south of there much less than that. From the
Front Range eastward, conditions should remain dry and relatively
mild overnight with a continuation of downslope flow.

.LONG TERM...(Friday through Wednesday)
Issued at 333 AM MST Thu Nov 16 2017

Main concern centers around powerful storm to impact Colorado
mountains Friday and Friday evening and the potential for heavy snow.
Across lower elevations, the main impact from this storm will be
the strong winds expected with the cold front late Friday
afternoon and some potential for light snow showers Friday evening.

On Friday, Moisture depth will continue to increase over the
mountains, but 700mb temperatures will still be warm, generally
around 0C during the am while orographic wind direction remains from
the southwest. Main impact in the mountains will be later Friday
afternoon and evening when the cold front moves through and
increasing orographic flow and steepening lapse rates. Could see
snowfall rates of 1-2 inches per hour with the front and banded
precip with the jet streak. This will certainly create some impact
along the I-70 corridor most likely from around 4 pm through 8
pm.

As for the hilites, will already have a winter storm warning in
place for zone 31 due to more favorable sw orographic flow. For
now will maintain the watch for zones 33 and 34. May not see the
heavier snow develop until Friday afternoon especially zone 34.
Suspect the hilites are running too long into Friday night and
suspect they can be dehoisted by midnight Friday night.

Across lower elevations, the associated strong cold front will
drop southward from late afternoon through early evening. Given
strong pressure rise behind front and subsidence could see gusts
in the 30-45 mph range over the northeast plains. Main change to
forecast was to increase winds over the plains for Friday night.
QG fields showing strong subsidence developing behind the trof.
Will still maintain scattered pops for now as jet dynamics will be
battling the increasing downslope northerly flow. Best chance for
any precip would be down south of Denver over the Palmer Divide
with better favored upslope component.

High pressure ridge aloft builds into the region this weekend with
drying and warming conditions. Temperatures will once again
rebound to above normal readings with 50s/60s through much of next
week. Next chance of snow for the mountains looks to come in
around the middle of next week.

&&

.AVIATION...(For the 12Z TAFS through 12Z Friday morning)
Issued at 333 AM MST Thu Nov 16 2017

VFR conditions will prevail across the Denver metro through
tonight. Light drainage winds early this morning will gradually
strengthen through the day with west-southwest winds of 10-20 kts
near the foothills and across southern portions of the Denver
metro area by the afternoon. Overnight, areas generally east of
Interstate 25 will see a return to a southerly winds of 5-15 kts.
West of there, west-southwest winds of 10-15 kts will prevail
with possible gusts to around 25 kts after midnight.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Winter Storm Watch from late tonight through late Friday night
for COZ033-034.

Winter Storm Warning from midnight tonight to 5 AM MST Saturday
for COZ031.

&&

SHORT TERM...Baker
LONG TERM...Entrekin
AVIATION...Baker

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1107 AM MST Wed Nov 15 2017

COZ030>051-161815-
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-
1107 AM MST Wed Nov 15 2017

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

.DAY ONE...This Afternoon and Tonight

Slightly cooler with increased winds this afternoon and into the
evening hours over the plains and higher elevations.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Dry, breezy and unseasonably warm weather on Thursday will elevate
the wildland fire danger on the plains and Palmer Divide. The
threat of fire should quickly diminish with darkness.

Thursday night into Friday night, a strong Pacific storm system
sliding south across the region is expected to bring snow, strong
winds and much colder temperatures the high country. Snowfall in
the mountains could be heavy at times on Friday and Friday night.
Strong gusty winds will also produce areas of blowing snow
creating poor travel conditions.

On the plains, a few rain and snow showers can be expected with
late on Friday with the passage of a strong cold front. Any snow
accumulation should be minor and confined to areas near the
foothills and on the Palmer Divide.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.