Alert archive / Idaho / Winter Storm Watches in 2021

Winter Storm Watch 9, NWS Spokane, WA

December 17, 20215 counties in Washington; 6 counties in Idaho

NWS Spokane, WA issued this winter storm watch at Dec 17, 2021, 1:53 PM PST for 5 counties in Washington; 6 counties in Idaho. It took effect at Dec 18, 2021, 10:00 AM PST. It was in force for .

The area

The counties it named.

The facts

Issued
Dec 17, 2021, 1:53 PM PST (21:53 UTC)
In effect from
Dec 18, 2021, 10:00 AM PST
Expired
Dec 18, 2021, 2:32 AM PST
In force
Issued by
NWS Spokane, WA

Counties Benewah County, ID, Bonner County, ID, Boundary County, ID, Kootenai County, ID, Latah County, ID, Shoshone County, ID, Asotin County, WA, Garfield County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA

The radar

The Spokane radar (KOTX), 53 km from the middle of the area, began a volume at 21:56 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

Spokane, WA (KOTX), launched 12:00Z, 9.9 hours before the alert went out and 43 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, Spokane, WA at 12:00Z on 2021-12-17Temperature 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, Spokane, WA at 12:00Z on 2021-12-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.1939587897Sfc1 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
1677 m above ground
0-6 km bulk shear
79 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
269 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

824 
WWUS46 KOTX 172153
WSWOTX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Spokane WA
153 PM PST Fri Dec 17 2021

...HEAVY SNOW POSSIBLE TONIGHT THROUGH THE WEEKEND FOR THE INLAND 
NORTHWEST...

.A winter storm will spread snow into the Cascades Friday night with 
snow becoming heavy Saturday morning through Saturday night. Travel 
will be difficult over Stevens Pass with this winter storm. Snow is 
expected to decrease by late Sunday morning. Snow will spread east 
impacting eastern Washington and northern Idaho including the 
Spokane to Coeur d'Alene metro areas. Heavy snow will persist in the 
Idaho Panhandle mountains into early next week.

WAZ048-181515-
/O.UPG.KOTX.WS.A.0008.211218T0600Z-211219T1800Z/
/O.NEW.KOTX.WS.W.0013.211218T0600Z-211219T1200Z/
Western Chelan County-
Including the cities of Holden Village and Stevens Pass
153 PM PST Fri Dec 17 2021

...WINTER STORM WARNING IN EFFECT FROM 10 PM THIS EVENING TO 4 AM 
PST SUNDAY...

* WHAT...Heavy snow possible. Total snow accumulations between 15 
  and 25 inches possible.

* WHERE...Holden Village and Stevens Pass.

* WHEN...From 10 PM this evening to 4 AM PST Sunday.

* IMPACTS...Travel could be very difficult to impossible. 

* ADDITIONAL DETAILS...Slow down and use caution while traveling. 
  The latest road conditions can be obtained by calling 5 1 1.

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 for 
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

IDZ002-WAZ036-181515-
/O.NEW.KOTX.WW.Y.0043.211218T0900Z-211219T0200Z/
Coeur d'Alene Area-Spokane Area-
Including the cities of Rockford, Spokane Valley, Worley, Coeur
d'Alene, Cheney, Fairfield, Hayden, Post Falls, Airway Heights,
Downtown Spokane, and Davenport
153 PM PST Fri Dec 17 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 6 PM PST 
SATURDAY...

* WHAT...Snow expected. Total snow accumulations 1 to 4 inches.

* WHERE...Rockford, Spokane Valley, Worley, Coeur d'Alene, Cheney, 
  Fairfield, Hayden, Post Falls, Airway Heights, Downtown Spokane, 
  and Davenport.

* WHEN...From 1 AM to 6 PM PST Saturday.

* IMPACTS...Plan on slippery road conditions. Additional snow on 
  roadways may cause difficult driving conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

IDZ001-181515-
/O.NEW.KOTX.WS.A.0009.211219T0000Z-211219T1200Z/
Northern Panhandle-
Including the cities of Eastport, Sandpoint, Bonners Ferry,
Athol, Schweitzer Mountain Road, and Priest River
153 PM PST Fri Dec 17 2021

...WINTER STORM WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE 
SATURDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations between 4 and 
  8 inches in the valleys and 12 to 18 inches in the mountains 
  possible. Winds could gust as high as 35 mph.

* WHERE...Eastport, Sandpoint, Bonners Ferry, Athol, Schweitzer 
  Mountain Road, and Priest River.

* WHEN...From Saturday afternoon through late Saturday night.

* IMPACTS...Travel could be very difficult. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

IDZ003-004-WAZ031-181515-
/O.NEW.KOTX.WS.A.0009.211219T1200Z-211221T0600Z/
Idaho Palouse-Central Panhandle Mountains-Northeast Blue
Mountains-
Including the cities of Potlatch, Dobson Pass, Plummer, Wallace,
Fourth Of July Pass, Anatone, Moscow, Osburn, Peola, Genesee,
Mountain Road, Kellogg, St. Maries, Cloverland Road, Fernwood,
Lookout Pass, Mullan, and Pinehurst
153 PM PST Fri Dec 17 2021

...WINTER STORM WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH 
MONDAY EVENING...

* WHAT...Heavy snow possible. Total snow accumulations between 3 and 
  10 inches in the Silver Valley and 8 to 12 inches in the central 
  Idaho mountains. For the Idaho Palouse 4 to 8 inches are possible. 
  For the northeast Blue mountains 5 to 10 inches.

* WHERE...Potlatch, Dobson Pass, Plummer, Wallace, Fourth Of July 
  Pass, Anatone, Moscow, Osburn, Peola, Genesee, Mountain Road, 
  Kellogg, St. Maries, Cloverland Road, Fernwood, Lookout Pass, 
  Mullan, and Pinehurst.

* WHEN...From late Saturday night through Monday evening.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the Monday morning and evening 
  commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

OTX
3 follow-up statements
227 
WWUS46 KOTX 172201
WSWOTX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Spokane WA
201 PM PST Fri Dec 17 2021

...HEAVY SNOW POSSIBLE TONIGHT THROUGH THE WEEKEND FOR THE INLAND 
NORTHWEST...

.A winter storm will spread snow into the Cascades Friday night with 
snow becoming heavy Saturday morning through Saturday night. Travel 
will be difficult over Stevens Pass with this winter storm. Snow is 
expected to decrease by late Sunday morning. Snow will spread east 
impacting eastern Washington and northern Idaho including the 
Spokane to Coeur d'Alene metro areas. Heavy snow will persist in the 
Idaho Panhandle mountains into early next week.

WAZ048-181515-
/O.CON.KOTX.WS.W.0013.211218T0600Z-211219T1200Z/
Western Chelan County-
Including the cities of Holden Village and Stevens Pass
201 PM PST Fri Dec 17 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 
4 AM PST SUNDAY...

* WHAT...Heavy snow possible. Total snow accumulations between 15 
  and 25 inches possible.

* WHERE...Holden Village and Stevens Pass.

* WHEN...From 10 PM this evening to 4 AM PST Sunday.

* IMPACTS...Travel could be very difficult to impossible. 

* ADDITIONAL DETAILS...Slow down and use caution while traveling. 
  The latest road conditions can be obtained by calling 5 1 1.

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 for 
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

IDZ002-WAZ036-181515-
/O.CON.KOTX.WW.Y.0043.211218T0900Z-211219T0200Z/
Coeur d'Alene Area-Spokane Area-
Including the cities of Rockford, Spokane Valley, Worley, Coeur
d'Alene, Cheney, Fairfield, Hayden, Post Falls, Airway Heights,
Downtown Spokane, and Davenport
201 PM PST Fri Dec 17 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 1 AM TO 6 PM PST 
SATURDAY...

* WHAT...Snow expected. Total snow accumulations 1 to 4 inches.

* WHERE...Rockford, Spokane Valley, Worley, Coeur d'Alene, Cheney, 
  Fairfield, Hayden, Post Falls, Airway Heights, Downtown Spokane, 
  and Davenport.

* WHEN...From 1 AM to 6 PM PST Saturday.

* IMPACTS...Plan on slippery road conditions. Additional snow on 
  roadways may cause difficult driving conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

WAZ037-181515-
/O.EXA.KOTX.WS.A.0009.211219T0000Z-211219T1200Z/
Northeast Mountains-
Including the cities of Chewelah, Colville, Northport, Flowery
Trail Road, Orin-Rice Road, Newport, Deer Park,
Springdale-Hunters Road, and Kettle Falls
201 PM PST Fri Dec 17 2021

...WINTER STORM WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE 
SATURDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations 2 to 4 inches 
  in the valleys and 5 to 10 inches in the mountains possible.

* WHERE...Chewelah, Colville, Northport, Flowery Trail Road, 
  Orin-Rice Road, Newport, Deer Park, Springdale-Hunters Road, and 
  Kettle Falls.

* WHEN...From Saturday afternoon through late Saturday night.

* IMPACTS...Plan on slippery road conditions. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

IDZ001-181515-
/O.CON.KOTX.WS.A.0009.211219T0000Z-211219T1200Z/
Northern Panhandle-
Including the cities of Eastport, Sandpoint, Bonners Ferry,
Athol, Schweitzer Mountain Road, and Priest River
201 PM PST Fri Dec 17 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM SATURDAY AFTERNOON 
THROUGH LATE SATURDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations between 4 and 
  8 inches in the valleys and 12 to 18 inches in the mountains 
  possible. Winds could gust as high as 35 mph.

* WHERE...Eastport, Sandpoint, Bonners Ferry, Athol, Schweitzer 
  Mountain Road, and Priest River.

* WHEN...From Saturday afternoon through late Saturday night.

* IMPACTS...Travel could be very difficult. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

IDZ003-004-WAZ031-181515-
/O.CON.KOTX.WS.A.0009.211219T1200Z-211221T0600Z/
Idaho Palouse-Central Panhandle Mountains-Northeast Blue
Mountains-
Including the cities of Potlatch, Dobson Pass, Plummer, Wallace,
Fourth Of July Pass, Anatone, Moscow, Osburn, Peola, Genesee,
Mountain Road, Kellogg, St. Maries, Cloverland Road, Fernwood,
Lookout Pass, Mullan, and Pinehurst
201 PM PST Fri Dec 17 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE SATURDAY NIGHT 
THROUGH MONDAY EVENING...

* WHAT...Heavy snow possible. Total snow accumulations between 3 and 
  10 inches in the Silver Valley and 8 to 12 inches in the central 
  Idaho mountains. For the Idaho Palouse 4 to 8 inches are possible. 
  For the northeast Blue mountains 5 to 10 inches.

* WHERE...Potlatch, Dobson Pass, Plummer, Wallace, Fourth Of July 
  Pass, Anatone, Moscow, Osburn, Peola, Genesee, Mountain Road, 
  Kellogg, St. Maries, Cloverland Road, Fernwood, Lookout Pass, 
  Mullan, and Pinehurst.

* WHEN...From late Saturday night through Monday evening.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the Monday morning and evening 
  commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

OTX
279 
WWUS46 KOTX 180118
WSWOTX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Spokane WA
518 PM PST Fri Dec 17 2021

WAZ037-181400-
/O.UPG.KOTX.WS.A.0009.211219T0000Z-211219T1200Z/
/O.EXB.KOTX.WS.W.0013.211218T0900Z-211219T0600Z/
Northeast Mountains-
Including the cities of Chewelah, Colville, Northport, Flowery
Trail Road, Orin-Rice Road, Newport, Deer Park,
Springdale-Hunters Road, and Kettle Falls
518 PM PST Fri Dec 17 2021

...WINTER STORM WARNING IN EFFECT FROM 1 AM TO 10 PM PST SATURDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 2 and 
  6 inches valleys and 5 to 10 inches mountains.

* WHERE...Chewelah, Colville, Northport, Flowery Trail Road, 
  Orin-Rice Road, Newport, Deer Park, Springdale-Hunters Road, and 
  Kettle Falls.

* WHEN...From 1 AM to 10 PM PST Saturday.

* IMPACTS...Winter driving conditions are expected Saturday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

IDZ001-181400-
/O.UPG.KOTX.WS.A.0009.211219T0000Z-211219T1200Z/
/O.EXB.KOTX.WS.W.0013.211218T1200Z-211219T1200Z/
Northern Panhandle-
Including the cities of Eastport, Sandpoint, Bonners Ferry,
Athol, Schweitzer Mountain Road, and Priest River
518 PM PST Fri Dec 17 2021

...WINTER STORM WARNING IN EFFECT FROM 4 AM SATURDAY TO 4 AM PST 
SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 4 and 
  8 inches valleys with localized amounts up to 12 inches. Mountain 
  accumulation of 12 to 18 inches.

* WHERE...Eastport, Sandpoint, Bonners Ferry, Athol, Schweitzer 
  Mountain Road, and Priest River.

* WHEN...From 4 AM Saturday to 4 AM PST Sunday.

* IMPACTS...Winter driving conditions are expected Saturday and 
  Saturday night.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

WAZ048-181400-
/O.CON.KOTX.WS.W.0013.211218T0600Z-211219T1200Z/
Western Chelan County-
Including the cities of Holden Village and Stevens Pass
518 PM PST Fri Dec 17 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 
4 AM PST SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 15 
  and 25 inches.

* WHERE...Holden Village and Stevens Pass.

* WHEN...From 10 PM this evening to 4 AM PST Sunday.

* IMPACTS...Winter driving conditions are expected late tonight 
  through early Sunday morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

WAZ038-181400-
/O.EXB.KOTX.WW.Y.0043.211218T0900Z-211219T0300Z/
Okanogan Highlands-
Including the cities of Wauconda, Boulder Creek Road, Chesaw
Road, Republic, Sherman Pass, Highway 20 Wauconda Summit, and
Inchelium
518 PM PST Fri Dec 17 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 7 PM PST 
SATURDAY...

* WHAT...Snow expected. Total snow accumulations between 1 and 3 
  inches valleys and 3 to 6 inches mountains.

* WHERE...Wauconda, Boulder Creek Road, Chesaw Road, Republic, 
  Sherman Pass, Highway 20 Wauconda Summit, and Inchelium.

* WHEN...From 1 AM to 7 PM PST Saturday.

* IMPACTS...Winter driving conditions are expected Saturday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

WAZ047-049-181400-
/O.EXB.KOTX.WW.Y.0043.211218T0900Z-211219T0600Z/
Central Chelan County-Western Okanogan County-
Including the cities of Winthrop, Plain, Leavenworth, Methow,
Twisp, Loup Loup Pass, Conconully, and Mazama
518 PM PST Fri Dec 17 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 10 PM PST 
SATURDAY...

* WHAT...Snow expected. Total snow accumulations between 3 and 6 
  inches valleys with 6 to 12 inches at Loup Loup and Blewett Passes.

* WHERE...Winthrop, Plain, Leavenworth, Methow, Twisp, Loup Loup 
  Pass, Conconully, and Mazama.

* WHEN...From 1 AM to 10 PM PST Saturday.

* IMPACTS...Winter driving conditions are expected Saturday into 
  Saturday evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

IDZ002-WAZ036-181400-
/O.EXT.KOTX.WW.Y.0043.211218T0900Z-211219T0000Z/
Coeur d'Alene Area-Spokane Area-
Including the cities of Rockford, Spokane Valley, Worley, Coeur
d'Alene, Cheney, Fairfield, Hayden, Post Falls, Airway Heights,
Downtown Spokane, and Davenport
518 PM PST Fri Dec 17 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 1 AM TO 4 PM PST 
SATURDAY...

* WHAT...Snow expected. Total snow accumulations between 1 and 3 
  inches.

* WHERE...Rockford, Spokane Valley, Worley, Coeur d'Alene, Cheney, 
  Fairfield, Hayden, Post Falls, Airway Heights, Downtown Spokane, 
  and Davenport.

* WHEN...From 1 AM to 4 PM PST Saturday.

* IMPACTS...Winter driving conditions are expected Saturday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

IDZ004-181400-
/O.EXT.KOTX.WS.A.0009.211218T1800Z-211220T1200Z/
Central Panhandle Mountains-
Including the cities of Fourth Of July Pass, Wallace, Osburn,
Dobson Pass, Kellogg, St. Maries, Fernwood, Lookout Pass, Mullan,
and Pinehurst
518 PM PST Fri Dec 17 2021

...WINTER STORM WATCH NOW IN EFFECT FROM SATURDAY MORNING THROUGH 
LATE SUNDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations 3 to 10 
  inches in the valleys and 8 to 12 inches mountains.

* WHERE...Fourth Of July Pass, Wallace, Osburn, Dobson Pass, 
  Kellogg, St. Maries, Fernwood, Lookout Pass, Mullan, and Pinehurst.

* WHEN...From Saturday morning through late Sunday night.

* IMPACTS...Winter driving conditions will be possible Saturday, 
  Saturday night and into Sunday, especially above 3000 feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

IDZ003-181400-
/O.EXT.KOTX.WS.A.0009.211219T0600Z-211220T1200Z/
Idaho Palouse-
Including the cities of Potlatch, Moscow, Plummer, and Genesee
518 PM PST Fri Dec 17 2021

...WINTER STORM WATCH NOW IN EFFECT FROM SATURDAY EVENING THROUGH 
LATE SUNDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations between 4 and 
  8 inches possible.

* WHERE...Potlatch, Moscow, Plummer, and Genesee.

* WHEN...From Saturday evening through late Sunday night.

* IMPACTS...Winter driving conditions will be possible Saturday 
  night, Sunday, and Sunday night.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

WAZ031-181400-
/O.EXT.KOTX.WS.A.0009.211219T0600Z-211220T1200Z/
Northeast Blue Mountains-
Including the cities of Mountain Road, Anatone, Peola, and
Cloverland Road
518 PM PST Fri Dec 17 2021

...WINTER STORM WATCH NOW IN EFFECT FROM SATURDAY EVENING THROUGH 
LATE SUNDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations between 5 and 
  10 inches possible. Winds could gust as high as 40 mph.

* WHERE...Mountain Road, Anatone, Peola, and Cloverland Road.

* WHEN...From Saturday evening through late Sunday night.

* IMPACTS...Travel in the Blue Mountains and back country recreation 
  may be impacted Saturday night, Sunday and Sunday night.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

GKOCH
624 
WWUS46 KOTX 181032
WSWOTX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Spokane WA
232 AM PST Sat Dec 18 2021

...SNOW TODAY THROUGH THE WEEKEND FOR THE INLAND NORTHWEST...

.A winter storm will continue over the Inland Northwest Saturday and 
Sunday. Snow will become heavy over the Cascades Saturday morning 
through Saturday night. Travel will be difficult over Stevens Pass 
with this winter storm. Snow is expected to decrease by late Sunday 
morning over the Cascades and northern Washington and Idaho. Snow 
will pick up over the Washington and Idaho Palouse and the 
Washington Blues Saturday night through Sunday night. Heavy snow 
will persist in the Idaho Panhandle mountains into early next week.

IDZ004-190030-
/O.UPG.KOTX.WS.A.0009.211218T1800Z-211220T1200Z/
/O.EXB.KOTX.WS.W.0013.211218T1800Z-211220T1200Z/
Central Panhandle Mountains-
Including the cities of Fourth Of July Pass, Wallace, Osburn,
Dobson Pass, Kellogg, St. Maries, Fernwood, Lookout Pass, Mullan,
and Pinehurst
232 AM PST Sat Dec 18 2021

...WINTER STORM WARNING IN EFFECT FROM 10 AM THIS MORNING TO 4 AM 
PST MONDAY...

* WHAT...Heavy snow possible. Total snow accumulations 4 to 10 
  inches in the valleys and 12 to 20 inches mountains.

* WHERE...Fourth Of July Pass, Wallace, Osburn, Dobson Pass, 
  Kellogg, St. Maries, Fernwood, Lookout Pass, Mullan, and Pinehurst.

* WHEN...From 10 AM this morning to 4 AM PST Monday.

* IMPACTS...Winter driving conditions will be possible Saturday, 
  Saturday night and into Sunday.

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 for 
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

IDZ003-190030-
/O.UPG.KOTX.WS.A.0009.211219T0600Z-211220T1200Z/
/O.EXB.KOTX.WS.W.0013.211219T0600Z-211220T1200Z/
Idaho Palouse-
Including the cities of Potlatch, Moscow, Plummer, and Genesee
232 AM PST Sat Dec 18 2021

...WINTER STORM WARNING IN EFFECT FROM 10 PM THIS EVENING TO 4 AM 
PST MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 5 and 
  10 inches.

* WHERE...Potlatch, Moscow, Plummer, and Genesee.

* WHEN...From 10 PM this evening to 4 AM PST Monday.

* IMPACTS...Winter driving conditions will be possible Saturday 
  night, Sunday, and Sunday night.

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 for 
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

WAZ037-190030-
/O.CON.KOTX.WS.W.0013.000000T0000Z-211219T0600Z/
Northeast Mountains-
Including the cities of Chewelah, Colville, Northport, Flowery
Trail Road, Orin-Rice Road, Newport, Deer Park,
Springdale-Hunters Road, and Kettle Falls
232 AM PST Sat Dec 18 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS 
EVENING...

* WHAT...Heavy snow expected. Total snow accumulations between 2 and 
  6 inches valleys and 5 to 10 inches mountains.

* WHERE...Chewelah, Colville, Northport, Flowery Trail Road, 
  Orin-Rice Road, Newport, Deer Park, Springdale-Hunters Road, and 
  Kettle Falls.

* WHEN...Until 10 PM PST this evening.

* IMPACTS...Winter driving conditions are expected Saturday.

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 for 
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

WAZ048-190030-
/O.CON.KOTX.WS.W.0013.000000T0000Z-211219T1200Z/
Western Chelan County-
Including the cities of Holden Village and Stevens Pass
232 AM PST Sat Dec 18 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 15 
  and 25 inches.

* WHERE...Holden Village and Stevens Pass.

* WHEN...Until 4 AM PST Sunday.

* IMPACTS...Winter driving conditions are expected late tonight 
  through early Sunday morning.

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 for 
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

IDZ001-190030-
/O.CON.KOTX.WS.W.0013.211218T1200Z-211219T1200Z/
Northern Panhandle-
Including the cities of Eastport, Sandpoint, Bonners Ferry,
Athol, Schweitzer Mountain Road, and Priest River
232 AM PST Sat Dec 18 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST SUNDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 5 and 
  10 inches valleys with localized amounts up to 12 inches. Mountain 
  accumulation of 12 to 20 inches.

* WHERE...Eastport, Sandpoint, Bonners Ferry, Athol, Schweitzer 
  Mountain Road, and Priest River.

* WHEN...Until 4 AM PST Sunday.

* IMPACTS...Winter driving conditions are expected Saturday and 
  Saturday night.

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 for 
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

WAZ031-190030-
/O.UPG.KOTX.WS.A.0009.211219T0600Z-211220T1200Z/
/O.EXB.KOTX.WW.Y.0043.211219T0600Z-211220T1200Z/
Northeast Blue Mountains-
Including the cities of Mountain Road, Anatone, Peola, and
Cloverland Road
232 AM PST Sat Dec 18 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 4 AM 
PST MONDAY...

* WHAT...Heavy snow possible. Total snow accumulations between 5 and 
  10 inches possible. Winds could gust as high as 40 mph.

* WHERE...Mountain Road, Anatone, Peola, and Cloverland Road.

* WHEN...From 10 PM this evening to 4 AM PST Monday.

* IMPACTS...Travel in the Blue Mountains and back country recreation 
  may be impacted Saturday night, Sunday and Sunday night.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

WAZ043-190030-
/O.EXB.KOTX.WW.Y.0043.211218T1200Z-211219T0600Z/
Okanogan Valley-
Including the cities of Disautel Pass, Brewster, Omak,
Bridgeport, Nespelem, Oroville, and Okanogan
232 AM PST Sat Dec 18 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 PM PST THIS EVENING...

* WHAT...Snow expected. Total snow accumulations between 1 and 4 
  inches.

* WHERE...Disautel Pass, Brewster, Omak, Bridgeport, Nespelem, 
  Oroville, and Okanogan.

* WHEN...Until 10 PM PST this evening.

* IMPACTS...Winter driving conditions are expected Saturday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

WAZ033-190030-
/O.EXB.KOTX.WW.Y.0043.211219T0600Z-211220T1200Z/
Washington Palouse-
Including the cities of Colfax, Rosalia, Tekoa, La Crosse,
Uniontown, Pullman, and Oakesdale
232 AM PST Sat Dec 18 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 4 AM 
PST MONDAY...

* WHAT...Wet snow expected. Total snow accumulations between 3 and 7 
  inches.

* WHERE...Colfax, Rosalia, Tekoa, La Crosse, Uniontown, Pullman, and 
  Oakesdale.

* WHEN...From 10 PM this evening to 4 AM PST Monday.

* IMPACTS...Winter driving conditions are expected late Saturday 
  night through Sunday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

WAZ038-190030-
/O.EXT.KOTX.WW.Y.0043.000000T0000Z-211219T0600Z/
Okanogan Highlands-
Including the cities of Wauconda, Boulder Creek Road, Chesaw
Road, Republic, Sherman Pass, Highway 20 Wauconda Summit, and
Inchelium
232 AM PST Sat Dec 18 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 10 PM PST THIS 
EVENING...

* WHAT...Snow expected. Total snow accumulations between 1 and 3 
  inches valleys and 3 to 6 inches mountains.

* WHERE...Wauconda, Boulder Creek Road, Chesaw Road, Republic, 
  Sherman Pass, Highway 20 Wauconda Summit, and Inchelium.

* WHEN...Until 10 PM PST this evening.

* IMPACTS...Winter driving conditions are expected Saturday and 
  Saturday night.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

IDZ002-WAZ036-190000-
/O.CON.KOTX.WW.Y.0043.000000T0000Z-211219T0000Z/
Coeur d'Alene Area-Spokane Area-
Including the cities of Rockford, Spokane Valley, Worley, Coeur
d'Alene, Cheney, Fairfield, Hayden, Post Falls, Airway Heights,
Downtown Spokane, and Davenport
232 AM PST Sat Dec 18 2021

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

* WHAT...Snow expected. Total snow accumulations 1 to 4 inches.

* WHERE...Rockford, Spokane Valley, Worley, Coeur d'Alene, Cheney, 
  Fairfield, Hayden, Post Falls, Airway Heights, Downtown Spokane, 
  and Davenport.

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

* IMPACTS...Winter driving conditions are expected Saturday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

WAZ047-049-190030-
/O.CON.KOTX.WW.Y.0043.000000T0000Z-211219T0600Z/
Central Chelan County-Western Okanogan County-
Including the cities of Winthrop, Plain, Leavenworth, Methow,
Twisp, Loup Loup Pass, Conconully, and Mazama
232 AM PST Sat Dec 18 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS 
EVENING...

* WHAT...Snow. Total snow accumulations between 3 and 6 inches 
  valleys with 6 to 12 inches at Loup Loup and Blewett Passes.

* WHERE...Winthrop, Plain, Leavenworth, Methow, Twisp, Loup Loup 
  Pass, Conconully, and Mazama.

* WHEN...Until 10 PM PST this evening.

* IMPACTS...Winter driving conditions are expected Saturday into 
  Saturday evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions for the state you are calling from can be obtained by 
calling 5 1 1.

&&

$$

VMT

The office that day

Everything else NWS Spokane, WA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 17, 3:22 AM PSTWinter Storm WatchOTXChelan11 hr
Dec 17, 1:53 PM PSTWinter Storm WarningOTXChelan, Pend Oreille, Spokane, Stevens48 hr
Dec 17, 1:53 PM PSTWinter Weather AdvisoryOTXAsotin, Chelan, Douglas, Ferry, Garfield, Lincoln and 3 more3 days

Nearby

Winter Storm Watches in Idaho, 2021Winter Storm Watches in Washington, 2021Every winter storm watch 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.