Snow Squall Warning 2, NWS Denver/Boulder, CO

726 
WWUS55 KBOU 292258
SQWBOU

Snow Squall Warning
National Weather Service Denver CO
356 PM MST Fri Nov 29 2019

COC019-049-059-093-117-292330-
/O.CON.KBOU.SQ.W.0002.000000T0000Z-191129T2330Z/
Park CO-Summit CO-Grand CO-Clear Creek CO-Jefferson CO-
356 PM MST Fri Nov 29 2019

...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 430 PM MST FOR
NORTHEASTERN PARK...NORTHERN SUMMIT...SOUTHERN GRAND...CLEAR CREEK
AND SOUTHWESTERN JEFFERSON COUNTIES...

At 356 PM MST, a dangerous snow squall was located along a line
extending from 10 miles east of Green Mountain Reservoir to near
Wellington Lake, or along a line extending from 66 miles east of
Glenwood Springs to 34 miles southwest of Denver, moving northeast at
20 mph.

HAZARD...Extremely poor visibility snow and blowing snow. Wind gusts 
         up to 30 mph.

SOURCE...Radar and webcams.

IMPACT...Expect hazardous road conditions.

This includes Interstate 70 between mile markers 206 and 233. 
Conditions have improved farther south around Hoosier Pass, but poor 
travel conditions remain. 

Locations impacted include... 
Silverthorne, Georgetown, Dillon, Empire, Silver Plume, Grant, 
Highland Park, Berthoud Pass, Loveland Pass, Shawnee, Berthoud 
Falls, Pine Junction, Bakerville, Green Mountain Reservoir, 
Keystone, Echo Lake, Guanella Pass, Buffalo Creek, Wellington Lake 
and Mt Evans.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.

Wet roadways will quickly freeze. Black ice will cause roads, bridges
and overpasses to become slick and dangerous. Slow down and be
prepared for sudden loss of traction.

&&

LAT...LON 3993 10643 3983 10570 3939 10516 3921 10526
      3967 10615 3977 10638
TIME...MOT...LOC 2256Z 204DEG 19KT 3985 10614 3934 10537 

$$

BARJENBRUCH

479 
WWUS55 KBOU 292326
SQWBOU

Snow Squall Warning
National Weather Service Denver CO
424 PM MST Fri Nov 29 2019

COC049-059-093-117-292334-
/O.CAN.KBOU.SQ.W.0002.000000T0000Z-191129T2330Z/
Park CO-Summit CO-Grand CO-Jefferson CO-
424 PM MST Fri Nov 29 2019

...THE SNOW SQUALL WARNING FOR NORTHEASTERN PARK...NORTHERN SUMMIT...
SOUTHERN GRAND AND SOUTHWESTERN JEFFERSON COUNTIES IS CANCELLED...

The snow squall which prompted the warning has moved out of the 
area. Therefore, the snow squall warning has been cancelled.

LAT...LON 3972 10557 3968 10561 3967 10582 3979 10590
      3986 10591 3983 10570
TIME...MOT...LOC 2324Z 204DEG 19KT 3997 10607 3946 10530 

$$

COC019-292330-
/O.CON.KBOU.SQ.W.0002.000000T0000Z-191129T2330Z/
Clear Creek CO-
424 PM MST Fri Nov 29 2019

...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 430 PM MST FOR
NORTHWESTERN CLEAR CREEK COUNTY...

At 424 PM MST, a dangerous snow squall was located along a line
extending from 7 miles south of Hot Sulphur Springs to 3 miles
northeast of Pine Grove, or along a line extending from 66 miles
southwest of Fort Collins to 25 miles southwest of Denver, moving
northeast at 20 mph.

HAZARD...Extremely poor visibility snow and blowing snow. Wind gusts 
         up to 30 mph.

SOURCE...Radar and webcams.

IMPACT...Expect hazardous road conditions.

This includes Interstate 70 between mile markers 220 and 233.
 
Locations impacted include...
Georgetown, Empire, Silver Plume, Bakerville, Berthoud Falls and
Berthoud Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.

Wet roadways will quickly freeze. Black ice will cause roads, bridges
and overpasses to become slick and dangerous. Slow down and be
prepared for sudden loss of traction.

&&

LAT...LON 3972 10557 3968 10561 3967 10582 3979 10590
      3986 10591 3983 10570
TIME...MOT...LOC 2324Z 204DEG 19KT 3997 10607 3946 10530 

$$

BARJENBRUCH

019 
WWUS55 KBOU 292336
SQWBOU

Snow Squall Warning
National Weather Service Denver CO
434 PM MST Fri Nov 29 2019

COC019-292344-
/O.EXP.KBOU.SQ.W.0002.000000T0000Z-191129T2330Z/
Clear Creek CO-
434 PM MST Fri Nov 29 2019

...THE SNOW SQUALL WARNING FOR NORTHWESTERN CLEAR CREEK COUNTY HAS
EXPIRED...

The snow squall which prompted the warning has weakened slightly and 
moved out of the area. Therefore, the snow squall warning has been 
allowed to expire. 

Drivers should still pay close attention to road conditions, as they 
will vary considerably over the I-70 Corridor through the mountains. 

LAT...LON 3972 10557 3968 10561 3967 10582 3979 10590
      3986 10591 3983 10570
TIME...MOT...LOC 2334Z 204DEG 19KT 4000 10605 3949 10528 

$$

BARJENBRUCH

Area Forecast Discussion
National Weather Service Denver/Boulder CO
318 PM MST Fri Nov 29 2019

.SHORT TERM...(This evening through Saturday)
Issued at 310 PM MST Fri Nov 29 2019

Strong storm system across the Great Basin this afternoon with
strong wave which will be shifting northeast through northern
Colorado this evening. Radar showing rather intense band of
moderate to heavy snow approaching Summit county this afternoon.
Could be 1-2 inches per snow in an hour or less for a short
duration this afternoon and into early this evening. This whole
wave will also shift out across the northeast plains of Colorado
with scattered rain and snow showers through this evening which
will be lifting northward through time. Could see a brief shot of
rain and snow showers over portions of the plains but given fast
movement of system don't expect much with accumulation's under an
inch.

Main impact with this departing storm system will be the very
strong downslope wind event expected as the main low heads up
into Nebraska. Cross sections showing cross barrier flow
increasing to 50-70kt with critical layer developing later
tonight and strengthening mountain top inversion. Surface
gradient also tightens to near 20mb from Denver to Grand Junction.
Expect gusts up to 80 mph in the mountains and up to 65 mph on the
plains on Saturday. Have added several zones to the east of Denver high
wind warning for Saturday.

.LONG TERM...(Saturday night through Friday)
Issued at 310 PM MST Fri Nov 29 2019

Strong northwesterly flow will be over the state Saturday night as
the winter storm pushes further into the Great Plains and an
upper ridge builds over the Great Basin. Light snow will continue
over the northern mountains Saturday evening with another inch
possible. The strong surface winds will be decreasing beginning in
the evening, but will still have gusts of 50 to 65 mph over the
mountains and higher foothills, and up to 45 mph over the far
northeastern plains. The pressure gradient will continue to
slowly relax overnight, with light winds across the western plains
and urban corridor as well the high mountains valleys, allowing
for temperatures to drop into the teens to single digits.

Temperatures will rebound slowly Sunday then much more on Monday
as an upper ridge moves over the area. The jet over the ridge will
remain over the northern mountains, which will keep winds breezy
to windy over the high terrain both days. Wind gusts of 30 to 45
mph will be expected, especially along the lee slopes of the Front
Range mountains.

A weak shortwave trough pushes down from the Northern Rockies to
bring a chance of snow to the mountains Monday night into Tuesday.
No precip is expected for the plains, but it will hold
temperatures to Monday's readings. A break in the weather is
expected Tuesday night into Wednesday, with another weak open
trough moving in from the west to bring another chance of snow to
the mountains Wednesday night into Thursday. Again, should only
impact the high terrain with only some cooling in temperatures
over the plains.

&&

.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 310 PM MST Fri Nov 29 2019

Stratus/fog have been quite persistent today with no winds to
really scour anything out. Incoming convection from the southwest
will move over local terminals in the 22-02z time frame and may
help to break up the very low stratus deck with scattered showers.
Kept in the VCTS but best chance for TS will be further south
across the Palmer Divide with better heating down there. Bigger
impacts will be coming on Saturday with strong downslope winds
developing at BJC and a lesser extent at APA/DEN. Playing the
stronger winds but if the HRRR right, it develops a Longmont
Anticyclone where winds could even back around to the east and
southeast at Denver and BJC. Confidence is lower on this scenario
so will keep out for now.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
High Wind Warning from 9 AM to 6 PM MST Saturday for COZ042>046-
048>051.

High Wind Warning from 8 PM this evening to 6 PM MST Saturday
for COZ033>036-038-039.

Winter Weather Advisory until 6 PM MST Saturday for COZ031-033-
034.

&&

SHORT TERM...Entrekin
LONG TERM...Kriederman
AVIATION...Entrekin

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1015 AM MST Fri Nov 29 2019

COZ030>051-301715-
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-
1015 AM MST Fri Nov 29 2019

...Winter Weather Advisory for the Northern Mountains this
afternoon through Saturday afternoon...
...High Wind Warning in effect for the mountains, foothills and
northeast plains tonight through Saturday afternoon...

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

.DAY ONE...Today and Tonight

Areas of dense fog will diminish later this morning, mainly from
Denver north and east to the Wyoming and Nebraska borders.
Visibilities could be reduced to less than a quarter mile at times.
Snow and wind will increase in the mountains and foothills this
afternoon and tonight. Storm totals of 4 to 8 inches will be
possible over the northern mountains with up to 12 inches around
Rabbit Ears Pass. Areas of blowing and drifting snow could
significantly reduce visibility and make travel difficult over the
high mountain passes.

Across lower elevations, thundersnow will be possible late this
afternoon which could impact the evening commute, with a quick
burst of 1 to 2 inches of snow as it moves across the northeast
plains of Colorado, including the Denver metro area. By this
evening, intense winds in and near the Front Range mountains and
foothills. Peak wind gusts to 80 mph can be expected. The strong
winds will continue into Saturday and may create blowing and
drifting snow.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Strong winds will continue over the Front Range Mountains and
foothills early Saturday morning, affecting the windprone areas
of the western suburbs as well, gusting to 65 to 85 mph, lasting
through the day. These northwest winds will then spread onto the
northeast plains later in the morning, gusting up to 65 mph
through the day. Blowing and drifting snow is likely, even from
last Tuesday's snow on the ground. High profile vehicles will be
in danger of blowing over, especially along north-south oriented
roads.

Those with plans to travel Saturday should delay and alter them
due to the expected strong winds and blowing snow.

The weather will warm up and dry out Sunday and Monday, with some
light snow expected over the mountains Monday night into Tuesday.
Winds won't be as strong as Saturday, but will remain breezy over
the mountains. Another weak system will bring light snow to the
mountains Wednesday night into Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight but reports
of fog, snow and strong winds would be greatly appreciated.