Alert archive / Colorado / Winter Storm Warnings in 2019

Winter Storm Warning 3, NWS Denver/Boulder, CO

February 13, 20194 counties in Colorado

NWS Denver/Boulder, CO issued this winter storm warning at Feb 13, 2019, 4:26 AM MST for 4 counties in Colorado. It took effect at Feb 13, 2019, 5:00 PM MST. It was in force for 18 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 13, 2019, 4:26 AM MST (11:26 UTC)
In effect from
Feb 13, 2019, 5:00 PM MST
Expired
Feb 14, 2019, 11:00 AM MST
In force
18 hr
Issued by
NWS Denver/Boulder, CO

Counties Boulder County, CO, Grand County, CO, Jackson County, CO, Larimer County, CO

The radar

The Cheyenne radar (KCYS), 121 km from the middle of the area, began a volume at 11:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 11.4 hours before the alert went out and 227 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2019-02-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2019-02-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3138 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
354 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

063 
WWUS45 KBOU 131126
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
426 AM MST Wed Feb 13 2019

...HEAVY SNOW MOVING INTO THE MOUNTAINS TONIGHT...

.Increasing moisture moving into Colorado later today and tonight
will combine with the strong winds aloft to produce moderate to
heavy snowfall in the mountains tonight and Thursday morning.
Windy conditions are expected through today, and the addition of
snowfall tonight will make for hazardous travel conditions through
the Colorado high country tonight. The gusty winds will produce
areas of blowing and drifting snow with very low visibilities at
times. The heaviest snow amounts are expected to be in the
mountains of Grand and Jackson counties, with lesser amounts in
North Park and Middle Park. Snow amounts will also be lower in
Summit County, but blowing and drifting snow will still make
travel difficult overnight. 

COZ031-033-131930-
/O.NEW.KBOU.WS.W.0003.190214T0000Z-190214T1800Z/
Rabbit Ears Pass-
Rocky Mountain National Park and the Medicine Bow Range-
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, and Willow Creek Pass
426 AM MST Wed Feb 13 2019

...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO
11 AM MST THURSDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 6 to 12
  inches expected. Winds gusting as high as 70 mph.

* WHERE...Rabbit Ears Pass and Rocky Mountain National Park and 
  the Medicine Bow Range.

* WHEN...From 5 PM this afternoon to 11 AM MST Thursday.

* ADDITIONAL DETAILS...Travel could be very difficult. Areas of
  blowing snow could significantly reduce visibility. The
  hazardous conditions will have the greatest impact on the
  Thursday morning travel time. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. 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.

&&

$$

COZ034-131930-
/O.NEW.KBOU.WW.Y.0011.190214T0000Z-190214T1800Z/
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of 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
426 AM MST Wed Feb 13 2019

...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO
11 AM MST THURSDAY...

* WHAT...Snow expected. Total snow accumulations of 4 to 8 inches
  expected. Winds gusting as high as 65 mph.

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

* WHEN...From 5 PM this afternoon to 11 AM MST Thursday.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Areas of
  blowing snow could significantly reduce visibility. The
  hazardous conditions will impact the Thursday morning travel 
  time. Very strong winds could cause extensive tree damage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. 

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

&&

$$
5 follow-up statements
576 
WWUS45 KBOU 131828
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
1128 AM MST Wed Feb 13 2019

...HEAVY SNOW MOVING INTO THE MOUNTAINS TONIGHT...

.Increasing moisture moving into Colorado later today and tonight
will combine with the strong winds aloft to produce moderate to
heavy snowfall in the mountains tonight and Thursday morning.
Windy conditions are expected through today, and the addition of
snowfall tonight will make for hazardous travel conditions
through the Colorado high country later tonight into Thursday
morning. The gusty winds will produce areas of blowing and 
drifting snow with very low visibilities at times. The heaviest 
snow amounts are expected to be in the mountains of Grand and 
Jackson counties, with lesser amounts in North Park and Middle 
Park. Snow amounts will be lower in Summit County, but blowing 
and drifting snow will still make travel difficult overnight.

COZ031-033-140100-
/O.CON.KBOU.WS.W.0003.190214T0000Z-190214T1800Z/
Rabbit Ears Pass-
Rocky Mountain National Park and the Medicine Bow Range-
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, and Willow Creek Pass
1128 AM MST Wed Feb 13 2019

...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 11 AM MST THURSDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 6 to 
  12 inches expected. Winds gusting as high as 70 mph.

* WHERE...Rabbit Ears Pass and Rocky Mountain National Park and 
  the Medicine Bow Range.

* WHEN...From 5 PM this afternoon to 11 AM MST Thursday.

* ADDITIONAL DETAILS...Travel could be very difficult. Areas of 
  blowing snow could significantly reduce visibility. The 
  hazardous conditions will have the greatest impact on the 
  Thursday morning travel time.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. 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.

&&

$$

COZ034-140100-
/O.CON.KBOU.WW.Y.0011.190214T0000Z-190214T1800Z/
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of 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
1128 AM MST Wed Feb 13 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 11 AM MST THURSDAY...

* WHAT...Snow expected. Total snow accumulations of 4 to 8 inches
  expected. Winds gusting as high as 70 mph.

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

* WHEN...From 5 PM this afternoon to 11 AM MST Thursday.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Areas 
  of blowing snow could significantly reduce visibility. The 
  hazardous conditions will impact the Thursday morning travel 
  time. Very strong winds could cause extensive tree damage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving.

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

&&

$$
528 
WWUS45 KBOU 132157
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
257 PM MST Wed Feb 13 2019

...HEAVY SNOW MOVING INTO THE MOUNTAINS TONIGHT...

.Increasing moisture moving into Colorado this afternoon and 
tonight will combine with the strong winds aloft to produce 
moderate to heavy snowfall. The winds and snowfall will make for 
hazardous travel conditions through the Colorado high country.
The gusty winds will produce areas of blowing and drifting snow 
with very low visibilities at times. The heaviest snow amounts are
expected to be in the mountains of Grand and Jackson counties, 
with lesser amounts in North Park and Middle Park. Snow amounts 
will be lower in Summit County, but blowing and drifting snow will
still make travel difficult overnight.

Another storm system will bring more snow to the mountains
Thursday evening through Friday morning with additional snowfall
of 4 to 8 inches. 

COZ031-033-140600-
/O.NEW.KBOU.WW.Y.0012.190215T0300Z-190215T1600Z/
/O.CON.KBOU.WS.W.0003.190214T0000Z-190214T1800Z/
Rabbit Ears Pass-
Rocky Mountain National Park and the Medicine Bow Range-
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, and Willow Creek Pass
257 PM MST Wed Feb 13 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST
THURSDAY...
...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THURSDAY TO 9 AM
MST FRIDAY...

* WHAT...Heavy snow. Total snow accumulations of 8 to 14 inches
  expected through Thursday morning. Winds gusting as high as 70 
  mph tonight. 

* WHERE...Rabbit Ears Pass and Rocky Mountain National Park and 
  the Medicine Bow Range.

* WHEN...For the Winter Storm Warning, until 11 AM MST Thursday. 
  For the Winter Weather Advisory, from 8 PM Thursday to 9 AM 
  MST Friday.

* ADDITIONAL DETAILS...Travel could be very difficult to 
  impossible. Patchy blowing snow could significantly reduce 
  visibility. The hazardous conditions could impact the morning 
  or evening commute. Very strong winds could cause extensive 
  tree damage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. 

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. 

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

&& 

$$

COZ034-140600-
/O.NEW.KBOU.WW.Y.0012.190215T0300Z-190215T1600Z/
/O.CON.KBOU.WW.Y.0011.190214T0000Z-190214T1800Z/
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of 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
257 PM MST Wed Feb 13 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST
THURSDAY...
...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THURSDAY TO 9 AM
MST FRIDAY...

* WHAT...Snow expected. Total snow accumulations of 4 to 8 inches
  expected through Thursday morning. Winds gusting as high as 65
  mph tonight. 

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

* WHEN...For the Winter Weather Advisory, until 11 AM MST 
  Thursday. For the Winter Weather Advisory, from 8 PM Thursday 
  to 9 AM MST Friday.

* ADDITIONAL DETAILS...Travel could be very difficult. Patchy 
  blowing snow could significantly reduce visibility. The 
  hazardous conditions could impact the morning or evening 
  commute. Very strong winds could cause extensive tree damage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. 

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

&&

$$
054 
WWUS45 KBOU 140345
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
845 PM MST Wed Feb 13 2019

...SNOW CONTINUING IN THE MOUNTAINS TONIGHT...

.There has been a lull in the snowfall this evening but is
expected to increase again towards midnight and continue through
Thursday morning. The winds and snowfall will make for hazardous 
travel conditions through the Colorado high country. The gusty 
winds will produce areas of blowing and drifting snow with very 
low visibilities at times. The heaviest snow amounts are expected 
to be in the mountains of Grand and Jackson counties, with lesser 
amounts in North Park and Middle Park. Snow amounts will be lower 
in Summit County, but blowing and drifting snow will still make 
travel difficult overnight.

Another storm system will bring more snow to the mountains
Thursday evening through Friday morning with additional snowfall
of 4 to 8 inches.

COZ031-033-141145-
/O.CON.KBOU.WS.W.0003.000000T0000Z-190214T1800Z/
/O.CON.KBOU.WW.Y.0012.190215T0300Z-190215T1600Z/
Rabbit Ears Pass-
Rocky Mountain National Park and the Medicine Bow Range-
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, and Willow Creek Pass
845 PM MST Wed Feb 13 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST
THURSDAY...
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THURSDAY
TO 9 AM MST FRIDAY...

* WHAT...Heavy snow at times. Total snow accumulations of 8 to 14
  inches expected through Thursday morning. Winds gusting as high
  as 70 mph tonight.

* WHERE...Rabbit Ears Pass and Rocky Mountain National Park and 
  the Medicine Bow Range.
 Increasing moisture 
moving into Colorado this afternoon and tonight will combine with 
the strong winds aloft to produce moderate to heavy snowfall.
* WHEN...For the Winter Storm Warning, until 11 AM MST Thursday. 
  For the Winter Weather Advisory, from 8 PM Thursday to 9 AM 
  MST Friday.

* ADDITIONAL DETAILS...Travel could be very difficult to 
  impossible. Patchy blowing snow could significantly reduce 
  visibility. The hazardous conditions could impact the morning 
  or evening commute. Very strong winds could cause extensive 
  tree damage. Increasing moisture 
moving into Colorado this afternoon and tonight will combine with 
the strong winds aloft to produce moderate to heavy snowfall.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency.
 Increasing moisture 
moving into Colorado this afternoon and tonight will combine with 
the strong winds aloft to produce moderate to heavy snowfall.
A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving.

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

&&

$$

COZ034-141145-
/O.CON.KBOU.WW.Y.0011.000000T0000Z-190214T1800Z/
/O.CON.KBOU.WW.Y.0012.190215T0300Z-190215T1600Z/
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of 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
845 PM MST Wed Feb 13 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST
THURSDAY...
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THURSDAY
TO 9 AM MST FRIDAY...

* WHAT...occasional snow expected. Total snow accumulations of 4 
  to 8 inches expected through Thursday morning. Winds gusting as 
  high as 65 mph tonight.

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

* WHEN...For the Winter Weather Advisory, until 11 AM MST 
  Thursday. For the Winter Weather Advisory, from 8 PM Thursday 
  to 9 AM MST Friday.

* ADDITIONAL DETAILS...Travel could be very difficult. Patchy 
  blowing snow could significantly reduce visibility. The 
  hazardous conditions could impact the morning or evening 
  commute. Very strong winds could cause extensive tree damage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving.

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

&&

$$
030 
WWUS45 KBOU 141159
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
459 AM MST Thu Feb 14 2019

...SNOW CONTINUING IN THE MOUNTAINS THIS MORNING...
...MORE SNOW EXPECTED TONIGHT AFTER AN AFTERNOON LULL...

.Abundant moisture moving into Colorado has combined with a very
strong upper level jet stream to produce moderate to heavy
snowfall in the mountains overnight. The snowmaking process
is expected to remain in place through this morning, producing
several more inches of fresh snowfall in the mountains. Along with
the heavy snow, gusty winds will create areas of blowing and
drifting snow, with poor visibilities. Later today, the upper 
level jet stream will move northward over Wyoming and snowfall 
rates over the Colorado mountains will decrease somewhat. Later 
this evening though, an additional surge of moisture moving in 
from the southwestern United States is expected to increase 
snowfall rates again. Wintery driving conditions will prevail 
across the north central Colorado mountains for the next couple 
days. Motorists in the high country should be prepared and 
equipped to handle the slippery road conditions they will face. 

COZ031-033-142000-
/O.CON.KBOU.WS.W.0003.000000T0000Z-190214T1800Z/
/O.CON.KBOU.WW.Y.0012.190215T0300Z-190215T1600Z/
Rabbit Ears Pass-
Rocky Mountain National Park and the Medicine Bow Range-
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, and Willow Creek Pass
459 AM MST Thu Feb 14 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST THIS
MORNING...
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THIS
EVENING TO 9 AM MST FRIDAY...

* WHAT...Heavy snow at times. Total snow accumulations of 10 to 16
  inches expected through late this morning. Winds gusting 40 to
  50 MPH will cause poor visibilities due to blowing and drifting
  snow. An additional 4 to 8 inches of snow is expected later
  tonight as another storm system moves into the state. 

* WHERE...Rabbit Ears Pass, Rocky Mountain National Park and the
  Medicine Bow Range.
  
* WHEN...Winter Storm Warning until 11 AM MST Thursday. Winter
  Weather Advisory from 8 PM tonight to 9 AM MST Friday.

* ADDITIONAL DETAILS...Travel could be very difficult to
  impossible. Areas blowing snow could significantly reduce
  visibility. The hazardous conditions will impact the morning
  drive time. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. A Winter Weather Advisory for 
snow means periods of snow will cause primarily travel 
difficulties. Expect snow covered roads and limited visibilities, 
and use caution while driving.

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

&&

$$

COZ034-142000-
/O.CON.KBOU.WW.Y.0011.000000T0000Z-190214T1800Z/
/O.CON.KBOU.WW.Y.0012.190215T0300Z-190215T1600Z/
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of 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
459 AM MST Thu Feb 14 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS
MORNING...
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THIS
EVENING TO 9 AM MST FRIDAY...

* WHAT...Occasional snow expected. Total snow accumulations of 5
  to 10 inches expected through late this morning. Winds gusting
  40 to 50 MPH this morning. After a period of light snow this
  afternoon, an increase in snowfall is expected through the
  evening. Additional snow amounts of 4 to 8 inches are expected.
  

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

* WHEN...Initial Winter Weather Advisory until 11 AM MST today. A
  second Winter Weather Advisory will be in effect from 8 PM
  tonight through 9 AM MST Friday.

* ADDITIONAL DETAILS...Travel could be very difficult. Patchy
  blowing snow could significantly reduce visibility. The
  hazardous conditions could impact the morning commute. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving.

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

&&

$$
572 
WWUS45 KBOU 141749
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
1049 AM MST Thu Feb 14 2019

...MORE SNOW EXPECTED TONIGHT...

.Snow will increase again this evening as a strong Pacific jet 
stream brings another round of abundant moisture to Colorado. 
Wintery driving conditions will prevail across the north central 
Colorado mountains into Friday. Motorists in the high country 
should be prepared and equipped to handle the slippery road 
conditions they will face. Snow will decrease and come to an end
Friday morning. This will be short-lived though as the next 
Pacific storm system is expected to bring more snow to the 
mountains late Friday night and Saturday.


COZ031-033-150200-
/O.EXP.KBOU.WS.W.0003.000000T0000Z-190214T1800Z/
/O.CON.KBOU.WW.Y.0012.190215T0300Z-190215T1600Z/
Rabbit Ears Pass-
Rocky Mountain National Park and the Medicine Bow Range-
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, and Willow Creek Pass
1049 AM MST Thu Feb 14 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THIS
EVENING TO 9 AM MST FRIDAY...
...WINTER STORM WARNING WILL EXPIRE AT 11 AM MST THIS MORNING...

* WHAT...Snow expected. Total snow accumulations of 4 to 8 
  inches expected. Winds gusting as high as 40 mph.

* WHERE...Rocky Mountain National Park and the Medicine Bow 
  Range and Rabbit Ears Pass.

* WHEN...From 8 PM this evening to 9 AM MST Friday.

* ADDITIONAL DETAILS...Travel could be very difficult. Patchy
  blowing snow could significantly reduce visibility. The
  hazardous conditions will impact the morning drive time. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. 

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

&&

$$

COZ034-150200-
/O.EXP.KBOU.WW.Y.0011.000000T0000Z-190214T1800Z/
/O.CON.KBOU.WW.Y.0012.190215T0300Z-190215T1600Z/
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of 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
1049 AM MST Thu Feb 14 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THIS
EVENING TO 9 AM MST FRIDAY...
...WINTER WEATHER ADVISORY WILL EXPIRE AT 11 AM MST THIS
MORNING...

* WHAT...Snow expected. Total snow accumulations of 4 to 8 
  inches expected. Winds gusting as high as 40 mph.

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

* WHEN...From 8 PM this evening to 9 AM MST Friday.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Areas of
  blowing snow could significantly reduce visibility. The
  hazardous conditions will impact the morning drive time. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. 

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

&&

$$

What forecasters said that day

The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this winter storm warning went out at Feb 13, 4:24 AM MST, 2 minutes earlier.

Area forecast discussion, Feb 13, 4:24 AM MST, 2 minutes before
Area Forecast Discussion
National Weather Service Denver/Boulder CO
424 AM MST Wed Feb 13 2019

.SHORT TERM...(Today and tonight)
Issued at 424 AM MST Wed Feb 13 2019

Flow aloft over Colorado is on the increase with satellite imagery
also showing a lot of clouds and moisture heading our way. A 100+
knot jet stream overnight is going to be replaced by a 180+ knot
jet stream later tonight along with a surge of Pacific moisture
that has been producing heavy snows in the Sierra Nevada for the
past couple days. These two ingredients will make for a very
active next 24 hours in the Colorado mountains. Winds have been
blowing over ridges and passes overnight and will be continuing
through today. The High Wind Warning will remain in place through
midnight.

When the Pacific moisture arrives this evening, moderate to heavy
snow is expected, especially to the north of the Interstate 70
corridor. Short and medium range model runs from overnight have
been showing an increasing trend in the mountain QPF amounts. It
looks like zones 31 and 33 could see snow falling at rates of 1
to 2 inches per hour overnight with accumulations up to a foot by
midday Thursday, when a lull in snowfall is expected. Zone 34 will
see lesser amounts. Will issue a Winter Storm Warning for zones 31
and 33 and and Winter Weather Advisory for zone 34. Moderate to
heavy snow along with the continuing winds should make for poor
travelling conditions overnight and Thursday morning.

On the plains it will be dry and mild, albeit a little breezy due
to the strong winds aloft. No precipitation is expected due to the
strong downsloping in the lee of the mountains. Typically windy
locations west of Interstate 25 could see gusty winds at times
this afternoon, but below High Wind Criteria. A Red flag Warning
will be in effect for southern Lincoln County this afternoon,
since they will have the warmest temperatures and lowest
humidities.

.LONG TERM...(Thursday through Tuesday)
Issued at 424 AM MST Wed Feb 13 2019

Orographic snow will continue in the mtns on Thu with westerly flow
aloft.  The heaviest snow will be in the morning hours with lighter
snow expected by midday. Across the plains it will be dry, however,
a cold front will move across the far nern plains by midday and then
move westward into the front range by late aftn. Thus highs will
range from the upper 30s over the far northeast corner with 55 to 60
near Denver.

For Thu night a disturbance will move across nrn CO with a decent
amount of QG ascent.  The flow aloft will become more southwest
which would favor zns 31 and 33 for the best snowfall with lighter
amounts in zn 34.  Across the plains the low level flow will be
mainly easterly Thu night and as the disturbance and associated QG
ascent move across. Thus could lead to a good chc of precip
generally north of a Denver to Akron line mainly in the 06z-12z time
period. Depending on how things evolve some places could see a few
inches of snow.

By Fri drier air will spread across the area with westerly flow
aloft.  Thus expect snow chances will decrease in the mtns.  Across
the plains there still could be a good chc of snow early Fri morning
over the far nern corner with dry conditons expected the rest of the
day.  As far as highs, readings will range from the 30's over the
far nern corner with 50's along the front range.

On Sat another disturbance embedded in nearly zonal flow aloft may
affect the area bringing more snow to the mtns.  QG fields show
favorable QG ascent along with rather steep lapse rates as well.
Across nern CO there is some disagreement between the ECMWF and GFS.
The GFS has a bora type front moving across the plains while the
ECMWF has more a northerly component behind the front.  In addition
the GFS has a drier airmass while the ECMWF has more moisture
available to produce some light precip across the far ern plains. As
for highs readings will drop back into 40s over nern CO with 30s
near the WY-NE border area.

By Sun a stg upper level trough will develop over the wrn US and
eventually move into the Great Basin by Sun night.  Cross-sections
show limited moisture over the area so will only mention a chc of
snow in the mtns.  Across nern CO a cold front will move across the
area bringing colder temperatures as readings drop into the upper
20s to mid 30s.

For Sun night and Mon the upper level trough over the Great Basin
will begin to move eastward as another shot of colder air moves into
nern CO.  Best QG ascent with this trough is fcst to stay south of
the area, however, as another shot of colder air moves into nern CO
this may allow for some light upslope driven snow.  Highs on Mon
will only be in the 20s over the plains.

By Tue the upper level trough continues to linger over the area. The
ECMWF shows a drier airmass with very little pcpn over the area
while the GFS continues to produce some light snow.  As for highs
readings will continue well below normal.

&&

.AVIATION...(For the 12Z TAFS through 12Z Thursday morning)
Issued at 424 AM MST Wed Feb 13 2019

VFR conditions with varying amounts of middle and high level
moisture and mountain wave conditions through the period.
Light south to southeast winds this morning will shift shift to
westerly by mid to late morning as the boundary layer deepens and
the momentum from the strong flow aloft mixes to the surface. Main
impact will be an amplifying mountain wave that leads to strong
and gusty westerly winds through this afternoon, especially at
KBJC with potential gusts up to 40 knots. Expect lighter winds at
KDEN, but still up to 30 knots possible.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning from noon today to 6 PM MST this evening for
COZ247.

High Wind Warning until midnight MST tonight for COZ033>036.

Winter Weather Advisory from 5 PM this afternoon to 11 AM MST
Thursday for COZ034.

Winter Storm Warning from 5 PM this afternoon to 11 AM MST
Thursday for COZ031-033.

&&

SHORT TERM...Dankers
LONG TERM...RPK
AVIATION...Dankers
Hazardous weather outlook, Feb 12, 6:29 PM MST, 9 hours 57 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
629 PM MST Tue Feb 12 2019

COZ030>051-131300-
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-
629 PM MST Tue Feb 12 2019

...HIGH WIND WARNING FOR THE HIGH MOUNTAINS AND FOOTHILLS LATE
TONIGHT AND THROUGH WEDNESDAY...
...CRITICAL FIRE WEATHER CONDITIONS EXPECTED OVER SOUTHERN LINCOLN
COUNTY WEDNESDAY...

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

.DAY ONE...Tonight

Strong winds will continue to strengthen over the mountains and
higher foothills tonight. Peak gusts in these areas will likely
reach into the 60 to 80 mph range, with stronger gusts in higher
wind prone areas later tonight. For the lower elevations, there
may be periods of winds gusting to 40 mph near the foothills late
tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Critical fire weather conditions are expected Wednesday over
southern Lincoln County as the strong winds will combine with
warm and very dry weather as well with dry cured fuels. Outdoor
burning of any kind is strongly discouraged.

High winds are also expected in the mountains and higher
foothills Wednesday into the evening which could make travel
difficult for drivers of high profile vehicles. Mountain areas
will also see snow increasing Wednesday night as a plume of
moisture from the Pacific arrives. Winds will remain strong enough
over the higher elevations to produce areas of blowing snow.
Additional Pacific moisture is expected to arrive Friday with more
snow in the mountains through Saturday. Cool and unsettled
weather will continue Sunday and Monday. Light to moderate amounts
of snow will come with each surge of moisture that moves over the
state.

On the plains, temperatures will be mild through Friday, but the
weekend will be colder, especially Sunday and Monday. There will
also be a chance of snow from Saturday through Monday, after the
passage of a cold front.

.SPOTTER INFORMATION STATEMENT...

Reports of strong winds will be appreciated.

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 12, 6:17 PM MSTRed Flag WarningBOUElbert, Lincoln24 hr
Feb 13, 4:26 AM MSTWinter Weather AdvisoryBOUBoulder, Clear Creek, Gilpin, Grand, Jefferson, Park and 1 more31 hr
Feb 13, 2:57 PM MSTWinter Weather AdvisoryBOUBoulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more42 hr

Nearby

Winter Storm Warnings in Colorado, 2019Every winter storm warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.