Alert archive / Oregon / Winter Storm Warnings in 2021

Winter Storm Warning 7, NWS Pendleton, OR

December 21, 2021Deschutes County, Jefferson County, Wasco County, Oregon

NWS Pendleton, OR issued this winter storm warning at Dec 21, 2021, 2:38 PM PST for Deschutes County, Jefferson County, Wasco County, Oregon. It took effect at Dec 22, 2021, 4:00 AM PST. It was in force for 48 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
Dec 21, 2021, 2:38 PM PST (22:38 UTC)
In effect from
Dec 22, 2021, 4:00 AM PST
Expired
Dec 24, 2021, 4:00 AM PST
In force
48 hr
Issued by
NWS Pendleton, OR

Counties Deschutes County, OR, Jefferson County, OR, Wasco County, OR

The radar

The Portland,OR radar (KRTX), 189 km from the middle of the area, began a volume at 22:38 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

Salem/Mcnary, OR (KSLE), launched 12:00Z, 10.6 hours before the alert went out and 148 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, Salem/Mcnary, OR at 12:00Z on 2021-12-21Temperature 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 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salem/Mcnary, OR at 12:00Z on 2021-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.19395878Sfc1 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
772 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

470 
WWUS46 KPDT 212238
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
238 PM PST Tue Dec 21 2021

WAZ520-221500-
/O.NEW.KPDT.WS.W.0007.211222T1200Z-211223T1800Z/
East Slopes of the Washington Cascades-
238 PM PST Tue Dec 21 2021

...WINTER STORM WARNING IN EFFECT FROM 4 AM WEDNESDAY TO 10 AM
PST THURSDAY ABOVE 3000 FEET...

* WHAT...Heavy snow expected above 3000 feet mainly near the
  crests. Total snow accumulations of 6 to 13 inches.

* WHERE...East Slopes of the Washington Cascades mainly impacting
  the crests.

* WHEN...From 4 AM Wednesday to 10 AM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may
  impact the Wednesday commutes and Thursday morning commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-221500-
/O.NEW.KPDT.WS.W.0007.211222T1800Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
238 PM PST Tue Dec 21 2021

...WINTER STORM WARNING IN EFFECT FROM 10 AM WEDNESDAY TO 4 PM
PST THURSDAY ABOVE 4000 FEET...

* WHAT...Heavy snow expected above 4000 feet mainly near the 
  crests. Total snow accumulations of 5 to 15 inches. Winds 
  gusting as high as 35 mph.

* WHERE...East Slopes of the Oregon Cascades mainly impacting the
  crests.

* WHEN...From 10 AM Wednesday to 4 PM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may
  impact morning and evening commutes Wednesday and Thursday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
11 follow-up statements
743 
WWUS46 KPDT 220559
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
959 PM PST Tue Dec 21 2021

WAZ520-221600-
/O.CON.KPDT.WS.W.0007.211222T1200Z-211223T1800Z/
East Slopes of the Washington Cascades-
959 PM PST Tue Dec 21 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 4 AM WEDNESDAY TO
10 AM PST THURSDAY ABOVE 3000 FEET...

* WHAT...Heavy snow expected above 3000 feet mainly near the crest.
  Total snow accumulations of 6 to 13 inches.

* WHERE...East Slopes of the Washington Cascades mainly impacting
  the crest.

* WHEN...From 4 AM Wednesday to 10 AM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may 
  impact the Wednesday commutes and Thursday morning commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-221600-
/O.CON.KPDT.WS.W.0007.211222T1800Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
959 PM PST Tue Dec 21 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM WEDNESDAY TO
4 PM PST THURSDAY ABOVE 4000 FEET...

* WHAT...Heavy snow expected above 4000 feet mainly near the crest.
  Total snow accumulations of 5 to 15 inches. Winds gusting as 
  high as 35 mph.

* WHERE...East Slopes of the Oregon Cascades mainly impacting the
  crest.

* WHEN...From 10 AM Wednesday to 4 PM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may 
  impact morning and evening commutes Wednesday and Thursday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
668 
WWUS46 KPDT 221108
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
308 AM PST Wed Dec 22 2021

WAZ520-230000-
/O.CON.KPDT.WS.W.0007.211222T1200Z-211223T1800Z/
East Slopes of the Washington Cascades-
308 AM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY ABOVE 3000 FEET...

* WHAT...Heavy snow expected above 3000 feet mainly near the 
  crest. Total snow accumulations of 6 to 13 inches.

* WHERE...East Slopes of the Washington Cascades mainly 
  impacting the crest.

* WHEN...From 4 AM Wednesday to 10 AM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may
  impact traffic along Interstate 90 and Snoqualmie Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-230000-
/O.CON.KPDT.WS.W.0007.211222T1800Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
308 AM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING
TO 4 PM PST THURSDAY ABOVE 4000 FEET...

* WHAT...Heavy snow expected above 4000 feet mainly near the 
  crest. Total snow accumulations of 5 to 15 inches. Winds 
  gusting as high as 35 mph.

* WHERE...East Slopes of the Oregon Cascades mainly impacting 
  the crest.

* WHEN...From 10 AM Wednesday to 4 PM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may
  impact traffic along US-97 and Santiam Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

WAZ030-230000-
/O.NEW.KPDT.WW.Y.0029.211223T0000Z-211224T0000Z/
Northwest Blue Mountains-
Including the city of Ski Bluewood Resort
308 AM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO
4 PM PST THURSDAY ABOVE 4000 FEET...

* WHAT...Snow expected above 4000 feet. Total snow accumulations 
  of 4 to 9 inches. Winds gusting as high as 35 mph.

* WHERE...Northwest Blue Mountains.

* WHEN...From 4 PM this afternoon to 4 PM PST Thursday.

* IMPACTS...Travel could be very difficult. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
132 
WWUS46 KPDT 222238
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
238 PM PST Wed Dec 22 2021

WAZ520-230700-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211223T1800Z/
East Slopes of the Washington Cascades-
238 PM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet mainly near the crests. 
  Additional snow accumulations of 3 to 10 inches. Winds gusting 
  as high as 35 mph.

* WHERE...East Slopes of the Washington Cascades mainly impacting
  the crests.

* WHEN...Until 10 AM PST Thursday.

* IMPACTS...Winter driving conditions are possible, and may impact
  traffic along Interstate 90 and Snoqualmie Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-230700-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
238 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 mainly near the crests. 
  Additional snow accumulations of 2 to 13 inches. Winds gusting 
  as high as 35 mph.

* WHERE...East Slopes of the Oregon Cascades primarily along the
  crests.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may
  impact traffic along US-97 and Santiam Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

WAZ030-230700-
/O.CON.KPDT.WW.Y.0029.211223T0000Z-211224T0000Z/
Northwest Blue Mountains-
Including the city of Ski Bluewood Resort
238 PM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
THURSDAY ABOVE 4000 FEET...

* WHAT...Snow expected above 4000 feet. Total snow accumulations 
  of 3 to 8 inches. Winds gusting as high as 40 mph.

* WHERE...Northwest Blue Mountains.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
092 
WWUS46 KPDT 230341
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
741 PM PST Wed Dec 22 2021

WAZ520-231500-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211223T1800Z/
East Slopes of the Washington Cascades-
741 PM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet mainly near the crests. 
  Additional snow accumulations of 3 to 10 inches. Winds gusting 
  as high as 35 mph.

* WHERE...East Slopes of the Washington Cascades.

* WHEN...Until 10 AM PST Thursday.

* IMPACTS...Winter driving conditions are possible, and may 
  impact traffic along Interstate 90 and Snoqualmie Pass.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-231500-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
741 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 mainly near the crests. 
  Additional snow accumulations of 2 to 13 inches. Winds gusting 
  as high as 35 mph.

* WHERE...East Slopes of the Oregon Cascades.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may 
  impact traffic along US-97 and Santiam Pass.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ502-231500-
/O.EXA.KPDT.WW.Y.0029.000000T0000Z-211224T0000Z/
Northern Blue Mountains of Oregon-
Including the cities of Meacham and Tollgate
741 PM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 PM PST THURSDAY
ABOVE 4000 FEET...

* WHAT...Snow above 4000 feet. Additional snow accumulations of 3 
  to 7 inches. Winds gusting as high as 35 mph.

* WHERE...Northern Blue Mountains of Oregon.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel could be very difficult.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

WAZ030-231500-
/O.CON.KPDT.WW.Y.0029.000000T0000Z-211224T0000Z/
Northwest Blue Mountains-
Including the city of Ski Bluewood Resort
741 PM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
THURSDAY ABOVE 4000 FEET...

* WHAT...Snow expected above 4000 feet. Total snow accumulations 
  of 3 to 8 inches. Winds gusting as high as 40 mph.

* WHERE...Northwest Blue Mountains.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
311 
WWUS46 KPDT 230537
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
937 PM PST Wed Dec 22 2021

WAZ520-231500-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211223T1800Z/
East Slopes of the Washington Cascades-
937 PM PST Wed Dec 22 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST
THURSDAY ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet mainly near the crests.
  Additional snow accumulations of 6 to 10 inches. Winds gusting 
  as high as 35 mph.

* WHERE...East Slopes of the Washington Cascades.

* WHEN...Until 10 AM PST Thursday.

* IMPACTS...Winter driving conditions are possible, and may 
  impact traffic along Interstate 90 and Snoqualmie Pass.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-231500-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
937 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 mainly near the crests.
  Additional snow accumulations of 6 to 12 inches, with higher
  amounts possible along the crest. Winds gusting as high as 35 
  mph.

* WHERE...East Slopes of the Oregon Cascades.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Winter driving conditions are possible. This may
  impact traffic along US-97 and Santiam Pass.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ502-WAZ030-231500-
/O.CON.KPDT.WW.Y.0029.000000T0000Z-211224T0000Z/
Northern Blue Mountains of Oregon-Northwest Blue Mountains-
Including the cities of Meacham, Tollgate, 
and Ski Bluewood Resort
937 PM PST Wed Dec 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST
THURSDAY ABOVE 4000 FEET...

* WHAT...Snow expected above 4000 feet. Total snow accumulations 
  of 3 to 8 inches. Winds gusting as high as 40 mph.

* WHERE...Northwest Blue Mountains.

* WHEN...Until 4 PM PST Thursday.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
776 
WWUS46 KPDT 231227
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
427 AM PST Thu Dec 23 2021

WAZ520-231800-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211223T1800Z/
East Slopes of the Washington Cascades-
427 AM PST Thu Dec 23 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow accumulations
  of up to 3 inches with higher amounts near the crest.

* WHERE...East Slopes of the Washington Cascades.

* WHEN...Until 10 AM PST this morning.

* IMPACTS...Winter driving conditions will continue, and may 
  impact traffic along Interstate 90 and Snoqualmie Pass.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-232030-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
427 AM PST Thu Dec 23 2021

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

* WHAT...Heavy snow above 4000 feet. Additional snow accumulations
  of 3 to 6 inches with higher amounts near the crest.

* WHERE...East Slopes of the Oregon Cascades.

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

* IMPACTS...Winter driving conditions will continue. This may
  impact traffic along Highways 20 and 26.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ502-WAZ030-232030-
/O.CON.KPDT.WW.Y.0029.000000T0000Z-211224T0000Z/
Northern Blue Mountains of Oregon-Northwest Blue Mountains-
Including the cities of Meacham, Tollgate, 
and Ski Bluewood Resort
427 AM PST Thu Dec 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 4000 FEET...

* WHAT...Snow above 4000 feet. Additional snow accumulations of 2
  to 4 inches. Winds gusting as high as 35 mph will cause blowing
  and drifting of snow.

* WHERE...Northwest Blue Mountains.

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

* IMPACTS...Travel could be very difficult.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
265 
WWUS46 KPDT 231737
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
937 AM PST Thu Dec 23 2021

WAZ520-240145-
/O.EXT.KPDT.WS.W.0007.000000T0000Z-211224T1200Z/
East Slopes of the Washington Cascades-
937 AM PST Thu Dec 23 2021

...WINTER STORM WARNING NOW IN EFFECT UNTIL 4 AM PST FRIDAY ABOVE
3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow 
  accumulations of up to 7 inches. Winds gusting as high as 45 
  mph.

* WHERE...East Slopes of the Washington Cascades.

* WHEN...Until 4 AM PST Friday.

* IMPACTS...Winter driving conditions will continue, and may
  impact traffic along Interstate 90 and Snoqualmie Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-240000-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
937 AM PST Thu Dec 23 2021

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

* WHAT...Heavy snow above 4000 feet. Additional snow 
  accumulations of 1 to 3 inches. Winds gusting as high as 35 
  mph.

* WHERE...East Slopes of the Oregon Cascades.

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

* IMPACTS...Winter driving conditions will continue. This may
  impact traffic along Highways 20 and 26.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ502-WAZ030-240000-
/O.CON.KPDT.WW.Y.0029.000000T0000Z-211224T0000Z/
Northern Blue Mountains of Oregon-Northwest Blue Mountains-
Including the cities of Meacham, Tollgate, 
and Ski Bluewood Resort
937 AM PST Thu Dec 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 4000 FEET...

* WHAT...Snow above 4000 feet. Additional snow accumulations of 2
  to 4 inches. Winds gusting as high as 45 mph.

* WHERE...In Washington, Northwest Blue Mountains. In Oregon, 
  Northern Blue Mountains of Oregon.

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

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
402 
WWUS46 KPDT 232136
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
136 PM PST Thu Dec 23 2021

ORZ509-240545-
/O.NEW.KPDT.WS.A.0006.211224T1400Z-211225T1400Z/
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T0000Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
136 PM 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 up to two inches. Winds gusting
  as high as 35 mph. For the Winter Storm Watch, heavy snow
  possible with total snow accumulations of 12 to 18 inches 
  possible.

* WHERE...East Slopes of the Oregon Cascades.

* 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 to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

* ADDITIONAL DETAILS...Snow showers are expected to diminish in
  intensity this afternoon into tonight for the Oregon Cascades
  before another round of heavy snow arrives Friday morning. The
  heaviest snow will be for the Cascade passes where totals of 12
  to 18 inches are forecast. Lower elevations will see lighter
  amounts in the 4 to 6 inch range.

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. 

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

WAZ520-240545-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T1200Z/
East Slopes of the Washington Cascades-
136 PM PST Thu Dec 23 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY
ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow 
  accumulations of up to 6 inches. Winds gusting as high as 45 
  mph.

* WHERE...East Slopes of the Washington Cascades.

* WHEN...Until 4 AM PST Friday.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ502-WAZ030-240000-
/O.CON.KPDT.WW.Y.0029.000000T0000Z-211224T0000Z/
Northern Blue Mountains of Oregon-Northwest Blue Mountains-
Including the cities of Meacham, Tollgate, 
and Ski Bluewood Resort
136 PM PST Thu Dec 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 4000 FEET...

* WHAT...Snow above 4000 feet. Additional snow accumulations of 
  up to two inches. Winds gusting as high as 45 mph.

* WHERE...In Washington, Northwest Blue Mountains. In Oregon, 
  Northern Blue Mountains of Oregon.

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

* IMPACTS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
123 
WWUS46 KPDT 232349
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
349 PM PST Thu Dec 23 2021

ORZ509-241200-
/O.EXP.KPDT.WS.W.0007.000000T0000Z-211224T0000Z/
/O.CON.KPDT.WS.A.0006.211224T1400Z-211225T1400Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
349 PM PST Thu Dec 23 2021

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

* WHAT...For the Winter Storm Watch, heavy snow  possible with 
  total snow accumulations of 12 to 18 inches possible.

* WHERE...East Slopes of the Oregon Cascades.

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

* IMPACTS...Travel could be very difficult to impossible. This may
  impact traffic along Highways 20 and 26.
  


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

ORZ502-WAZ030-240100-
/O.EXP.KPDT.WW.Y.0029.000000T0000Z-211224T0000Z/
Northern Blue Mountains of Oregon-Northwest Blue Mountains-
Including the cities of Meacham, Tollgate, 
and Ski Bluewood Resort
349 PM PST Thu Dec 23 2021

...WINTER WEATHER ADVISORY WILL EXPIRE AT 4 PM PST THIS AFTERNOON
ABOVE 4000 FEET...

There could still be a passing snow shower, but little additional
accumulation is expected.

$$

WAZ520-241200-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T1200Z/
East Slopes of the Washington Cascades-
349 PM PST Thu Dec 23 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY
ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow 
  accumulations of up to 6 inches. Winds gusting as high as 40 
  mph.

* WHERE...East Slopes of the Washington Cascades.

* WHEN...Until 4 AM PST Friday.

* IMPACTS...Winter driving conditions will continue, and may
  impact traffic along Interstate 90 and Snoqualmie Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
022 
WWUS46 KPDT 240455
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
855 PM PST Thu Dec 23 2021

ORZ509-241200-
/O.UPG.KPDT.WS.A.0006.211224T1400Z-211225T1400Z/
/O.NEW.KPDT.WS.W.0008.211224T1400Z-211225T1400Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
855 PM PST Thu Dec 23 2021

...WINTER STORM WARNING IN EFFECT FROM 6 AM FRIDAY TO 6 AM PST
SATURDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 12 to 18 
  inches. Winds gusting as high as 35 mph.

* WHERE...East Slopes of the Oregon Cascades.

* WHEN...From 6 AM Friday to 6 AM PST Saturday.

* IMPACTS...Travel could be very difficult to impossible. This may
  impact travel along SR 20 and 26.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

WAZ520-241200-
/O.CON.KPDT.WS.W.0007.000000T0000Z-211224T1200Z/
East Slopes of the Washington Cascades-
855 PM PST Thu Dec 23 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY
ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow accumulations
  of 4 to 6 inches.

* WHERE...East Slopes of the Washington Cascades.

* WHEN...Until 4 AM PST Friday.

* IMPACTS...Winter driving conditions will continue, and may
  impact traffic along Interstate 90 and Snoqualmie Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT
599 
WWUS46 KPDT 241141
WSWPDT

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pendleton OR
341 AM PST Fri Dec 24 2021

WAZ520-242300-
/O.EXP.KPDT.WS.W.0007.000000T0000Z-211224T1200Z/
/O.NEW.KPDT.WW.Y.0030.211224T1200Z-211224T2300Z/
East Slopes of the Washington Cascades-
Including the cities of Cle Elum and Cliffdell
341 AM PST Fri Dec 24 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 3 PM PST THIS
AFTERNOON...
...WINTER STORM WARNING WILL EXPIRE AT 4 AM PST EARLY THIS
MORNING ABOVE 3000 FEET...

* WHAT...Snow expected. Total snow accumulations 4 to 8 inches.

* WHERE...East Slopes of the Washington Cascades.

* WHEN...Until 3 PM PST this afternoon.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the morning commute.

* ADDITIONAL DETAILS...Although the heavy snow will taper off this
  morning, there will be periods of moderate snow during the day.
  Most snowfall this afternoon will be south of Mount Adams.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

ORZ509-242315-
/O.CON.KPDT.WS.W.0008.211224T1400Z-211225T1400Z/
East Slopes of the Oregon Cascades-
Including the cities of La Pine and Sunriver
341 AM PST Fri Dec 24 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM PST
SATURDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 10 to 14
  inches with the heaviest amount near the crest.

* WHERE...East Slopes of the Oregon Cascades.

* WHEN...Until 6 AM PST Saturday.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

The latest road conditions can be obtained by calling 5 1 1, or
by visiting online at https://tripcheck.com for Oregon or
https://wsdot.com/travel for Washington.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/PDT

The office that day

Everything else NWS Pendleton, OR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 21, 5:13 AM PSTFreezing Fog AdvisoryPDTCrook, Deschutes, Jefferson5 hr

Nearby

Winter Storm Warnings in Oregon, 2021Winter Storm Warnings in Washington, 2021Every winter storm warning in 2021

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.