Winter Storm Warning 6, NWS Portland, OR

583 
WWUS46 KPQR 221139
WSWPQR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Portland OR
339 AM PST Wed Dec 22 2021

WAZ019-230100-
/O.CON.KPQR.WS.W.0006.211222T1600Z-211224T0000Z/
/O.CON.KPQR.WW.Y.0027.000000T0000Z-211222T1600Z/
South Washington Cascades-
Including the city of Mount St. Helens
339 AM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS
MORNING ABOVE 4000 FEET...
...WINTER STORM WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING
TO 4 PM PST THURSDAY ABOVE 3000 FEET...

* WHAT...Occasional snow and freezing rain this morning, then
  heavy snow developing this afternoon. Heavy snow expected
  tonight into Thursday morning, tapering to snow showers Thursday
  afternoon. Total snow accumulations of 6 to 24 inches expected
  above 3000 feet, with the heaviest accumulations above 4000 feet
  in elevation. Spotty ice accumulations of up to one tenth of an
  inch possible as well. Winds gusting as high as 40 mph will
  likely cause blowing and drifting of snow, and reduced
  visibility.

* WHERE...South Washington Cascades above 3000 feet.

* WHEN...For the Winter Weather Advisory, until 8 AM PST this
  morning. For the Winter Storm Warning, from 8 AM this morning to
  4 PM PST Thursday. 

* IMPACTS...Travel conditions are expected to be difficult. Expect
  snow and ice covered roads and greatly reduced visibility. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for winter driving conditions with snow and ice
covered roads and very limited visibility. If you must travel in
the mountains, slow down, and allow plenty of extra time to reach
your destination. Allow extra following distance to the vehicle 
in front of you, and keep snow chains and a winter survival kit, 
including a flashlight, food, and water in your vehicle in case of
an emergency.

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ011-230100-
/O.CON.KPQR.WS.W.0006.211222T1600Z-211224T0000Z/
/O.CON.KPQR.WW.Y.0027.000000T0000Z-211222T1600Z/
Northern Oregon Cascades-
Including the city of Santiam Pass
339 AM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS
MORNING ABOVE 4000 FEET...
...WINTER STORM WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING
TO 4 PM PST THURSDAY ABOVE 4000 FEET...

* WHAT...Occasional snow or freezing rain this morning, then heavy
  snow developing this afternoon. Heavy snow expected tonight
  through Thursday morning, tapering to snow showers Thursday
  afternoon. Total snow accumulations of 6 to 24 inches expected
  above 4000 feet, with the heaviest accumulations above 5000 
  feet in elevation. Spotty ice accumulations of up to one tenth 
  of an inch possible as well. Winds gusting as high as 40 mph 
  will likely cause blowing and drifting of snow, and reduced 
  visibility.

* WHERE...Northern Oregon Cascades above 4000 feet.

* WHEN...For the Winter Weather Advisory, until 8 AM PST this
  morning. For the Winter Storm Warning, from 8 AM this morning to
  4 PM PST Thursday. 

* IMPACTS...Travel conditions are expected to be difficult. Expect
  snow and ice covered roads and greatly reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for winter driving conditions with snow and ice
covered roads and very limited visibility. If you must travel in
the mountains, slow down, and allow plenty of extra time to reach
your destination. Allow extra following distance to the vehicle 
in front of you, and keep snow chains and a winter survival kit, 
including a flashlight, food, and water in your vehicle in case of
an emergency. 

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ013-230100-
/O.CON.KPQR.WS.W.0006.211222T1600Z-211224T0000Z/
Cascades in Lane County-
Including the cities of McKenzie Pass and Willamette Pass
339 AM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING
TO 4 PM PST THURSDAY ABOVE 4000 FEET...

* WHAT...Heavy snow expected. Total snow accumulations of 8 to 24
  inches, heaviest above 5000 feet in elevation. Winds gusting as
  high as 35 mph.

* WHERE...Cascades in Lane County above 4000 feet.

* WHEN...From 8 AM this morning to 4 PM PST Thursday.

* IMPACTS...Travel conditions are expected to be difficult. Expect
  snow and ice covered roads and greatly reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for winter driving conditions with snow and ice
covered roads and very limited visibility. If you must travel in
the mountains, slow down, and allow plenty of extra time to reach
your destination. Allow extra following distance to the vehicle 
in front of you, and keep snow chains and a winter survival kit, 
including a flashlight, food, and water in your vehicle in case of
an emergency. 

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ014-221600-
/O.CON.KPQR.WW.Y.0027.000000T0000Z-211222T1600Z/
Upper Hood River Valley-
Including the cities of Parkdale and Odell
339 AM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS
MORNING...

* WHAT...Freezing rain. Additional ice accumulations of a light 
  glaze.

* WHERE...Upper Hood River Valley.

* WHEN...Until 8 AM PST this morning.

* IMPACTS...Very slippery sidewalks, roads and bridges are 
  possible. The hazardous conditions could impact the morning 
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. Prepare for possible
power outages. 

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

Weagle

709 
WWUS46 KPQR 221558
WSWPQR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Portland OR
758 AM PST Wed Dec 22 2021


WAZ019-230100-
/O.EXP.KPQR.WW.Y.0027.000000T0000Z-211222T1600Z/
/O.CON.KPQR.WS.W.0006.211222T1600Z-211224T0000Z/
South Washington Cascades-
Including the city of Mount St. Helens
758 AM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THURSDAY
ABOVE 3000 FEET...
...WINTER WEATHER ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING
ABOVE 4000 FEET...

* WHAT...Occasional snow and freezing rain this morning, then
  heavy snow developing this afternoon. Heavy snow expected
  tonight into Thursday morning, tapering to snow showers Thursday
  afternoon. Total snow accumulations of 6 to 24 inches expected
  above 3000 feet, with the heaviest accumulations above 4000
  feet. Winds gusting as high as 40 mph will likely cause blowing
  and drifting snow, and reduced visibility. 

* WHERE...South Washington Cascades above 3000 feet.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel conditions are expected to be difficult. Expect
  snow and ice covered roads and greatly reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ011-230100-
/O.EXP.KPQR.WW.Y.0027.000000T0000Z-211222T1600Z/
/O.CON.KPQR.WS.W.0006.211222T1600Z-211224T0000Z/
Northern Oregon Cascades-
Including the city of Santiam Pass
758 AM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THURSDAY
ABOVE 4000 FEET...
...WINTER WEATHER ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING
ABOVE 4000 FEET...

* WHAT...Occasional snow or freezing rain this morning, then heavy
  snow developing this afternoon. Heavy snow expected tonight
  through thursday morning, tapering to snow showers Thursday
  afternoon. Total snow accumulations of 8 to 24 inches expected
  above 4000 feet, with the heaviest accumulations above 5000
  feet. Winds gusting as high as 40 mph will likely cause blowing
  and drifting of snow, and reduced visibility.

* WHERE...Northern Oregon Cascades above 4000 feet.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel conditions are expected to be difficult. Expect
  snow and ice covered roads and greatly reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ014-221700-
/O.EXP.KPQR.WW.Y.0027.000000T0000Z-211222T1600Z/
Upper Hood River Valley-
Including the cities of Parkdale and Odell
758 AM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING...

Temperatures are expected to warm to above freezing this morning,
minimizing the threat of freezing rain. 

$$

ORZ013-230100-
/O.CON.KPQR.WS.W.0006.211222T1600Z-211224T0000Z/
Cascades in Lane County-
Including the cities of McKenzie Pass and Willamette Pass
758 AM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THURSDAY
ABOVE 4000 FEET...

* WHAT...Heavy snow expected. Total snow accumulations of 8 to 24
  inches, heaviest above 5000 feet. Winds gusting as high as 35 
  mph.

* WHERE...Cascades in Lane County above 4000 feet.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel conditions are expected to be difficult. Expect
  snow and ice covered roads and greatly reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

866 
WWUS46 KPQR 222257
WSWPQR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Portland OR
257 PM PST Wed Dec 22 2021

WAZ019-231200-
/O.CON.KPQR.WS.W.0006.000000T0000Z-211224T0000Z/
South Washington Cascades-
Including the city of Mount St. Helens
257 PM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THURSDAY
ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow accumulations
  of 4 to 18 inches, with the heaviest accumulations above 4000
  feet. Winds gusting as high as 35 mph.

* WHERE...South Washington Cascades above 3000 feet.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel could be very difficult. Patchy blowing snow 
  could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ011-013-231200-
/O.CON.KPQR.WS.W.0006.000000T0000Z-211224T0000Z/
Northern Oregon Cascades-Cascades in Lane County-
Including the cities of Santiam Pass, McKenzie Pass, 
and Willamette Pass
257 PM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THURSDAY
ABOVE 4000 FEET...

* WHAT...Heavy snow above 4000 feet. Additional snow accumulations
  of 6 to 20 inches, with the heaviest accumulations above 5000
  feet. Winds gusting as high as 35 mph.

* WHERE...Northern Oregon Cascades and Cascades in Lane County
  above 4000 ft.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel could be very difficult. Patchy blowing snow 
  could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

165 
WWUS46 KPQR 230145
WSWPQR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Portland OR
545 PM PST Wed Dec 22 2021



WAZ019-231400-
/O.CON.KPQR.WS.W.0006.000000T0000Z-211224T0000Z/
South Washington Cascades-
Including the city of Mount St. Helens
545 PM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THURSDAY
ABOVE 3000 FEET...


* WHAT...Heavy snow above 3000 feet. Additional snow accumulations
  of 4 to 8 inches expected around 3000 feet. 8 to 16 inches of
  snow will likely fall around 4000 feet and above. Winds gusting
  as high as 35 mph.

* WHERE...South Washington Cascades above 3000 feet.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel could be hazardous due to snow and ice covered
  roads, and low visibility.



PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for winter driving conditions with snow and ice
covered roads and very limited visibility. If you must travel in
the mountains, slow down, and allow plenty of extra time to reach
your destination. Allow extra following distance to the vehicle 
in front of you, and keep snow chains and a winter survival kit, 
including a flashlight, food, and water in your vehicle in case of
an emergency.


For the latest road conditions visit https://www.tripcheck.com or
https://wsdot.com/travel/real-time/map or by calling 5 1 1

&&

$$

ORZ011-013-231400-
/O.CON.KPQR.WS.W.0006.000000T0000Z-211224T0000Z/
Northern Oregon Cascades-Cascades in Lane County-
Including the cities of Santiam Pass, McKenzie Pass, 
and Willamette Pass
545 PM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THURSDAY
ABOVE 4000 FEET...


* WHAT...Heavy snow above 4000 feet. Additional snow accumulations
  of 4 to 8 inches expected around 4000 feet. 8 to 16 inches of 
  snow will likely fall around 5000 feet and above. Winds gusting 
  as high as 35 mph.

* WHERE...Northern Oregon Cascades and Cascades in Lane County 
  above 4000 ft.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel could be hazardous due to snow and ice covered
  roads, and low visibility.



PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for winter driving conditions with snow and ice
covered roads and very limited visibility. If you must travel in
the mountains, slow down, and allow plenty of extra time to reach
your destination. Allow extra following distance to the vehicle 
in front of you, and keep snow chains and a winter survival kit, 
including a flashlight, food, and water in your vehicle in case of
an emergency.


For the latest road conditions visit https://www.tripcheck.com or
https://wsdot.com/travel/real-time/map or by calling 5 1 1

&&

$$

740 
WWUS46 KPQR 231309
WSWPQR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Portland OR
509 AM PST Thu Dec 23 2021

ORZ011-013-240030-
/O.NEW.KPQR.WS.A.0009.211224T1400Z-211225T1400Z/
/O.CON.KPQR.WS.W.0006.000000T0000Z-211224T0000Z/
Northern Oregon Cascades-Cascades in Lane County-
Including the cities of Detroit, Santiam Pass, McKenzie Pass, 
McKenzie Bridge, Oakridge, and Willamette Pass
509 AM PST Thu Dec 23 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 4000 FEET...
...WINTER STORM WATCH IN EFFECT FROM FRIDAY MORNING THROUGH LATE
FRIDAY NIGHT...

* WHAT...For the Winter Storm Warning above 4000 feet, heavy snow.
  Additional snow accumulations of 6 to 10 inches today. Winds
  gusting as high as 35 mph. For the Winter Storm Watch, heavy
  snow possible. Total snow accumulations of 10 to 20 inches 
  possible.

* WHERE...Northern Oregon Cascades and Cascades in Lane County.

* WHEN...For the Winter Storm Warning, until 4 PM PST this 
  afternoon. For the Winter Storm Watch, from Friday morning 
  through late Friday night.

* IMPACTS...Travel could be very difficult.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Monitor the latest forecasts for updates on this situation. 

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

WAZ019-240000-
/O.CON.KPQR.WS.W.0006.000000T0000Z-211224T0000Z/
South Washington Cascades-
Including the city of Mount St. Helens
509 AM PST Thu Dec 23 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow accumulations
  of 3 to 5 inches expected around 3000 feet, and 6 to 9 inches of
  snow around 4000 feet and above today. Winds gusting as high as
  35 mph.

* WHERE...South Washington Cascades.

* WHEN...Until 4 PM PST this afternoon.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ010-012-240030-
/O.NEW.KPQR.WS.A.0009.211224T1400Z-211225T1400Z/
Northern Oregon Cascade Foothills-
Cascade Foothills in Lane County-
509 AM PST Thu Dec 23 2021

...WINTER STORM WATCH IN EFFECT FROM FRIDAY MORNING THROUGH LATE
FRIDAY NIGHT ABOVE 2000 FEET...

* WHAT...Heavy snow possible above 2000 feet. Total snow
  accumulations of 6 to 12 inches possible.

* WHERE...Northern Oregon Cascade Foothills and Cascade 
  Foothills in Lane County.

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

* IMPACTS...Travel could be very difficult.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

089 
WWUS46 KPQR 232129 AAB
WSWPQR

URGENT - WINTER WEATHER MESSAGE...UPDATED
National Weather Service Portland OR
129 PM PST Thu Dec 23 2021

WAZ019-240600-
/O.EXA.KPQR.WS.A.0009.211224T1400Z-211225T1400Z/
/O.CON.KPQR.WS.W.0006.000000T0000Z-211224T0000Z/
South Washington Cascades-
Including the cities of Coldwater Ridge Visitors Center, 
Mount St. Helens, and Wind River Valley
129 PM PST Thu Dec 23 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 3000 FEET...
...WINTER STORM WATCH IN EFFECT FROM FRIDAY MORNING THROUGH LATE
FRIDAY NIGHT...

* WHAT...For the Winter Storm Warning above 3000 feet, heavy snow
  diminishing. Additional snow accumulations of up to two inches.
  For the Winter Storm Watch, heavy snow possible. Total snow 
  accumulations of up to 12 to 18 inches possible.

* WHERE...South Washington Cascades.

* WHEN...Winter Storm Warning until 4 PM PST. For the Winter 
  Storm Watch, from Friday morning through late Friday night.

* IMPACTS...Travel could be hazardous due to snow and ice covered
  roads, and low visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for winter driving conditions with snow and ice
covered roads and very limited visibility. If you must travel in
the mountains, slow down, and allow plenty of extra time to reach
your destination. Allow extra following distance to the vehicle 
in front of you, and keep snow chains and a winter survival kit, 
including a flashlight, food, and water in your vehicle in case of
an emergency.  

Also please monitor the latest forecasts for Friday and Friday
night as more heavy snow is possible. 

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ011-013-240600-
/O.CON.KPQR.WS.W.0006.000000T0000Z-211224T0000Z/
/O.CON.KPQR.WS.A.0009.211224T1400Z-211225T1400Z/
Northern Oregon Cascades-Cascades in Lane County-
Including the cities of Government Camp, Detroit, Santiam Pass, 
McKenzie Pass, McKenzie Bridge, Oakridge, and Willamette Pass
129 PM PST Thu Dec 23 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 4000 FEET...
...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY MORNING
THROUGH LATE FRIDAY NIGHT...

* WHAT...For the Winter Storm Warning above 4000 feet, heavy snow
  diminishing this afternoon. Additional snow accumulations of 1
  to 3 inches. Winds gusting as high as 35 mph. For the Winter
  Storm Watch, heavy snow possible. Total snow accumulations of 12
  to 20 inches possible.

* WHERE...Northern Oregon Cascades and Cascades in Lane County.

* WHEN...For the Winter Storm Warning, until 4 PM PST this 
  afternoon. For the Winter Storm Watch, from Friday morning 
  through late Friday night.

* IMPACTS...Travel could be hazardous due to snow and ice covered
  roads, and low visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared for winter driving conditions with snow and ice
covered roads and very limited visibility. If you must travel in
the mountains, slow down, and allow plenty of extra time to reach
your destination. Allow extra following distance to the vehicle 
in front of you, and keep snow chains and a winter survival kit, 
including a flashlight, food, and water in your vehicle in case of
an emergency.  

Also please monitor the latest forecasts for Friday and Friday
night as more heavy snow is possible.

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ003-004-WAZ020-240600-
/O.EXA.KPQR.WS.A.0009.211224T1400Z-211225T1400Z/
Coast Range of Northwest Oregon-
Central Coast Range of Western Oregon-Willapa Hills-
Including the cities of Sunset Summit, Lees Camp, and Trask
129 PM PST Thu Dec 23 2021

...WINTER STORM WATCH IN EFFECT FROM FRIDAY MORNING THROUGH LATE
FRIDAY NIGHT...

* WHAT...Heavy snow possible above 1000 ft. Total snow
  accumulations of 6 to 12 inches possible.

* WHERE...In Washington, Willapa Hills. In Oregon, Coast Range 
  of Northwest Oregon and Central Coast Range of Western Oregon.

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

* IMPACTS...Travel could become very difficult due to snow and ice
  covered roads and limited visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Anyone with travel plans should stay aware of the latest weather
information and have alternative travel plans, or delay travel, 
if possible.

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

ORZ010-012-240600-
/O.CON.KPQR.WS.A.0009.211224T1400Z-211225T1400Z/
Northern Oregon Cascade Foothills-
Cascade Foothills in Lane County-
129 PM PST Thu Dec 23 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY MORNING
THROUGH LATE FRIDAY NIGHT ABOVE 2000 FEET...

* WHAT...Heavy snow possible above 2000 feet. Total snow
  accumulations of 10 to 18 inches possible.

* WHERE...Northern Oregon Cascade Foothills and Cascade 
  Foothills in Lane County.

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

* IMPACTS...Travel could become very difficult due to snow and ice
  covered roads and limited visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Anyone with travel plans should stay aware of the latest weather
information and have alternative travel plans, or delay travel, 
if possible. 

For the latest road conditions visit 
https://www.tripcheck.com or 
https://wsdot.com/travel/real-time/map 
or by calling 5 1 1

&&

$$

Area Forecast Discussion UPDATED
National Weather Service Portland OR
835 AM PST Tue Dec 21 2021

...UPDATED, for aviation weather.

.SYNOPSIS...Today starts off with a break in the precipitation for
most of SW Washington and NW Oregon as high pressure moves overhead.
Temperatures remain at or below freezing in the Hood River Valley,
but otherwise the lowlands are above freezing and should remain so
through Thursday. Rain will spread back onshore into the area
tonight, while snow levels slowly lower back to the Cascade passes.
Spotty light freezing rain is possible as the rain moves into the
central Columbia Gorge and adjacent valleys. Temperatures will be
below normal heading into the holiday weekend, as additional low
pressure systems move onshore from the Gulf of Alaska/Western Canada.
This set up could lead to some lowland snow through the weekend and
into the start of next week.
&&

.SHORT TERM...Today through Thursday...Today is starting off with a
break in precipitation for most of the forecast area as weak high
pressure moves northeastward across the forecast area. A few spots of
clearing overnight almost immediately led to fog development for
those areas. Some of the fog was dense with vsbys less than 1/4 mile
earlier in the night, but the fog appears to be lifting into a low
stratus deck. Therefore it seems safe to cancel the Dense Fog
Advisory for the south Willamette Valley.

The frontal zone which brought the heavy precipitation the past
couple days is decaying over southern Washington, with little precip
left to speak of. The dominant weather feature in the area is now a
near-995 mb low centered near 40N/135W. This system is pushing an
occluding front into far northern California. Meanwhile, a cold front
over the Gulf of Alaska is beginning to move southeastward. This
front will interact with some shortwave energy ejecting northeastward
from the low to its south while approaching the Pac NW coast tonight,
likely causing rain to spread across the forecast area tonight

The warm air aloft will cause snow levels to start out rather high as
precipitation starts this evening. The lack or any true arctic air in
place in the Columbia Basin in advance of this system suggests that
this will largely be a low elevation rain/mountain snow event with
snow levels somewhere lowering to roughly 3500-4000 feet as
precipitation increases overnight. We inherited a winter storm watch
for tonight/Wednesday for portions of the Columbia River Gorge and
Hood River Valley on the east side of Mt. Hood, but the latest
guidance is trending warmer, and it now appears that the probability
for freezing rain/mixed precip is decreasing. That said, we were
cautious in not canceling the watch just yet before it even goes into
effect, but it appears increasingly likely that the Gorge and lower
portions of the Hood River Valley will remain just a tad too warm to
see much winter precip with this system at all. QPF looks marginal
for warning amounts of snow in the higher Cascades as well - and
advisory would probably be more appropriate for the 6 to 14 inches
expected. Since there is still some potential for temperatures to
remain below freezing in the Hood River valley - especially with the
fresh snow cover above 500-700 feet - will hang on to the watch for
now and let the day shift take one last look at it.

The cold front itself is expected to move southeast across the
forecast area later Wed night and into Thu, bringing more rain and
mountain snow. Most 00z ECMWF ensembles suggest 850 mb temps will
drop to -3 or -4 deg C Thursday, causing snow levels to lower to 2000
to 2500 feet. This will be the beginning of a general trend toward
colder temperatures as we head into Christmas weekend.	Weagle
&&

.LONG TERM...Friday through Monday...Unsettled weather expected to
continue later this week and through the Christmas weekend.
Temperatures are expected to trend much cooler by this weekend and
into early next week, while the probability of precipitation remains
fairly high. Deterministic models are in decent agreement of a
general upper level troughing pattern over the Pacific Northwest,
including multiple rounds of 500 mb shortwave troughs maintaining
active weather. The 12Z WPC Cluster Analysis also indicates
confidence of an upper trough persisting over the Pacific NW and
western Canada into early next week, which could draw down some
colder air, especially later in the period. At the surface, models
suggest a series of mostly weak low pressure systems will move
through the Pacific NW combined with below normal temperatures, while
NBM guidance broadly suggests this will maintain around an 80-90%
probability of precipitation. With the possibilities of snow down to
sea level increasing, the challenge will be to determine the details
of potential winter weather and the impacts across the region.

The latest model guidance suggests snow levels on Friday around
1500-2500 ft lower to around 500-1000 ft on Saturday, and to the
valley floor by Sunday. NBM snow probabilities in the Willamette
Valley indicate a 20% chance for at least a trace of snow on
Christmas Day, and up to a 70-90% chance for snow later in the
weekend. Ensemble members remain quite optimistic about lowland
snowfall potential this weekend as well. As mentioned previously,
there is potential for more than just a dusting of snow across all of
our lowlands, as the NBM shows a 30-50% chance of 4 or more inches of
snow occurring within a 24-hour period late this weekend into Monday.
But there remains high uncertainty in any snow accumulation amounts
at this time. Also of note will be potential travel impacts, which
could be significant.  /DH/SMW

&&

.AVIATION...18Z TAFs: Deep low off the south Oregon coast will
maintain southerly flow aloft, with increasing mid and high clouds
today. Generally, VFR across region today, with pockets of IFR/low
MVFR stratus and patchy fog inland this am.

Clouds gradually thicken, and CIGS lower this afternoon into the
evening as front approaches from the southwest. Will see rain
spreading across the region, from KEUG to KNOP around 03Z, and
lifting northward to KAST to KPDX line by 06Z. Expect widespread
MVFR tonight, with rain continuing. Higher terrain frequently
obscured in clouds and precipitation.

For detailed regional Pac NW aviation weather information, go
online to: https://weather.gov/zse

KPDX AND APPROACHES...Southerly flow aloft, with increasing mid and
high clouds today. Will still have pockets of 900 to 1200 ft stratus
farther to west and northwest of KPDX this am. Trend has been for
this stratus breaking up, and it should remain to west of PDX until
breaking up by 19Z. Otherwise, VFR today into this evening. Then,
CIGS lowering to low VFR, then on down to MVFR overnight as rain
increases.                                             /Rockey &&

.MARINE...A low pressure well off the southern Oregon coast will
continue to weaken over the next 24 hours and bring fewer and fewer
impacts to the waters. Meanwhile, another low pressure will drop
southeastward towards the region from Haida Gwaii and push a cold
front across the waters Wednesday. Southerly winds should increase
tonight into Wednesday morning ahead of the cold front. Expect solid
Small Craft Advisory level wind gusts of 30 kt to develop as a
result. Seas should respond accordingly and climb back into the low
teens for 12-24 hours.

Another low pressure is forecast to take a similar track Thursday
night and will likely result in another front bringing another
bout of gusty winds to the waters. Small Craft Advisory level
wind gusts once again appear the most likely scenario, but unlike
the Tuesday night/Wednesday front, winds may be gusty both ahead
of the front and behind the front on Thursday night/Friday. These
more persistent northwest winds behind the front may push seas into
the mid to upper teens late Friday, but confidence in this panning
out remains modest. Additional low pressures will drop southeastward
into the waters off the Pacific Northwest Coast over the weekend and
early next week. These generally shouldn't be big wind producers,
but they may help to keep seas in the low teens until at least
Monday. Temperatures will be unusually cold during this time and
snow showers will be possible over the waters. /Neuman

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...Dense Fog Advisory until 10 AM PST this morning for South
     Willamette Valley.

     Winter Storm Watch from this evening through Wednesday
     afternoon for Cascades in Lane County-Central Columbia
     River Gorge-Northern Oregon Cascades-Upper Hood River
     Valley.

WA...Winter Storm Watch from this evening through Wednesday
     afternoon for Central Columbia River Gorge-South
     Washington Cascades.

PZ...Small Craft Advisory from 4 PM this afternoon to 9 PM PST
     Wednesday for coastal waters from Cape Shoalwater WA to
     Florence OR from 10 to 60 nm.

     Small Craft Advisory from 8 PM this evening to 9 PM PST
     Wednesday for coastal waters from Cape Shoalwater WA to
     Florence OR out 10 nm.

     Small Craft Advisory from 4 PM this afternoon to 8 PM PST this
     evening for Columbia River Bar.

&&

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