Alert archive / Washington / Winter Storm Warnings in 2021
Winter Storm Warning 2, NWS Spokane, WA
NWS Spokane, WA issued this winter storm warning at Jan 3, 2021, 3:11 PM PST for Ferry County, Okanogan County, Washington. It took effect at Jan 4, 2021, 12:00 AM PST. It was in force for 19 hr. 5 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jan 3, 2021, 3:11 PM PST (23:11 UTC)
- In effect from
- Jan 4, 2021, 12:00 AM PST
- Expired
- Jan 4, 2021, 7:00 PM PST
- In force
- 19 hr
- Issued by
- NWS Spokane, WA
Counties Ferry County, WA, Okanogan County, WA
The radar
The Spokane radar (KOTX), 145 km from the middle of the area, began a volume at 23:10 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jan 4, 2:51 AM PST | HEAVY SNOW 5.1 | Republic, WA | |
| Jan 4, 9:42 AM PST | SNOW 5 | 1 W Twisp, WA | |
| Jan 4, 10:20 AM PST | HEAVY SNOW 4.5 | 7 Wnw Malott, WA | SINCE 10PM LAST NIGHT. STILL SNOWING HEAVY. |
| Jan 4, 11:45 AM PST | HEAVY SNOW 5.5 | 2 Se Twisp, WA | STILL SNOWING. |
| Jan 4, 4:00 PM PST | SNOW 6.2 | Winthrop, WA | CO-OP OBSERVER STATION WNPW1 WINTHROP. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 11.2 hours before the alert went out and 222 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 727 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 508 m²/s²
- 0-3 km storm-relative helicity
- 487 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
612 WWUS46 KOTX 032311 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 311 PM PST Sun Jan 3 2021 ...MORE HEAVY SNOW FOR THE MOUNTAINS...THE METHOW VALLEY...AND THE OKANOGAN HIGHLANDS MONDAY... WAZ038-041330- /O.UPG.KOTX.WS.A.0002.210104T0800Z-210105T0300Z/ /O.NEW.KOTX.WS.W.0002.210104T1000Z-210105T0300Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 311 PM PST Sun Jan 3 2021 ...WINTER STORM WARNING IN EFFECT FROM 2 AM TO 7 PM PST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations of 3 to 6 inches valleys above 2500 feet. Mountain accumulations of 6 to 10 inches. * WHERE...Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...From 2 AM to 7 PM PST Monday. * IMPACTS...Motorists should plan for winter driving conditions Monday into Monday evening. * ADDITIONAL DETAILS...Snow will likely change to rain over southern portions of Ferry county early in the morning and the change to rain will spread into the valleys of central and northern portions of the Okanogan Highland during the day. 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. && $$ WAZ042-041330- /O.UPG.KOTX.WS.A.0002.210104T0600Z-210105T0300Z/ /O.NEW.KOTX.WS.W.0002.210104T0800Z-210105T0300Z/ East Slopes Northern Cascades- Including the following locations Mazama, Twisp, Winthrop, Stehekin, Conconully, Blewett Pass, Loup Loup Pass, Stevens Pass, Plain, and Holden Village 311 PM PST Sun Jan 3 2021 ...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 7 PM PST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations of 6 to 9 inches in the valleys. Accumulations of 10 to 18 inches for the mountains. * WHERE...Mazama, Twisp, Winthrop, Stehekin, Conconully, Blewett Pass, Loup Loup Pass, Stevens Pass, Plain, and Holden Village. * WHEN...From midnight tonight to 7 PM PST Monday. * IMPACTS...Motorists should plan for winter driving conditions Monday into Monday evening. Over a foot of new snow will be likely for Stevens Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WAZ041-043-044-041330- /O.NEW.KOTX.WW.Y.0002.210104T1000Z-210104T2000Z/ Wenatchee Area-Okanogan Valley-Waterville Plateau- Including the following locations Number 1 Canyon, Number 2 Canyon, Nespelem, Disautel Pass, Waterville, Mansfield, and Badger Mountain Road 311 PM PST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 2 AM TO NOON PST MONDAY... * WHAT...Snow expected. Total snow accumulations of up to 3 inches. * WHERE...Number 1 Canyon, Number 2 Canyon, Nespelem, Disautel Pass, Waterville, Mansfield, and Badger Mountain Road. * WHEN...From 2 AM to noon PST Monday. * ELEVATION...Accumulations less than an inch are likely for elevations below 2000 feet around Wenatchee, Chelan, and Brewster. Slushy accumulations of an inch or two will be possible around Omak and Oroville below 2000 feet. * IMPACTS...Motorists should plan for winter driving conditions Monday morning. 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. && $$ IDZ001-WAZ037-041330- /O.NEW.KOTX.WW.Y.0002.210104T1200Z-210104T2000Z/ Northern Panhandle-Northeast Mountains- Including the following locations Priest River, Eastport, Schweitzer Mountain Road, Newport, Springdale-Hunters Road, Orin-Rice Road, and Flowery Trail Road 311 PM PST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM TO NOON PST MONDAY ABOVE 2000 FEET... * WHAT...Snow expected above 2000 feet. Total snow accumulations of up to 3 inches valleys. Accumulations of 6 to 12 inches mountains. * WHERE...Priest River, Eastport, Schweitzer Mountain Road, Newport, Springdale-Hunters Road, Orin-Rice Road, and Flowery Trail Road. * WHEN...From 4 AM to noon PST Monday. * IMPACTS...Motorists should plan for winter driving conditions Monday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
4 follow-up statements
964 WWUS46 KOTX 041313 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 513 AM PST Mon Jan 4 2021 ...MORE HEAVY SNOW FOR THE MOUNTAINS...THE METHOW VALLEY...AND THE OKANOGAN HIGHLANDS TODAY... WAZ042-042115- /O.CON.KOTX.WS.W.0002.000000T0000Z-210105T0300Z/ East Slopes Northern Cascades- Including the following locations Leavenworth, Mazama, Twisp, Winthrop, Stehekin, Conconully, Blewett Pass, Loup Loup Pass, Stevens Pass, Plain, and Holden Village 513 AM PST Mon Jan 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM PST THIS EVENING... * WHAT...Heavy snow. Additional snow accumulations of 4 to 7 inches in the valleys. Accumulations of 7 to 13 inches in the mountains. * WHERE...Leavenworth, Mazama, Twisp, Winthrop, Stehekin, Conconully, Blewett Pass, Loup Loup Pass, Stevens Pass, Plain, and Holden Village. * WHEN...Until 7 PM PST this evening. * IMPACTS...Motorists should expect winter driving conditions Today. Over a foot of new snow will be likely for Stevens Pass into this evening. 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. && $$ WAZ038-042115- /O.CON.KOTX.WS.W.0002.000000T0000Z-210105T0300Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 513 AM PST Mon Jan 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM PST THIS EVENING... * WHAT...Heavy snow. Total snow accumulations of 3 to 6 inches valleys above 2500 feet. Mountain accumulations of 6 to 10 inches. * WHERE...Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...Until 7 PM PST this evening. * IMPACTS...Motorists should expect winter driving conditions Today. * ADDITIONAL DETAILS...Snow will likely change to rain over southern portions of Ferry County from late morning through the afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WAZ041-043-044-042000- /O.CON.KOTX.WW.Y.0002.000000T0000Z-210104T2000Z/ Wenatchee Area-Okanogan Valley-Waterville Plateau- Including the following locations Number 1 Canyon, Number 2 Canyon, Nespelem, Disautel Pass, Waterville, Mansfield, and Badger Mountain Road 513 AM PST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY... * WHAT...Snow. Additional snow accumulations of 1 to 4 inches. * WHERE...Number 1 Canyon, Number 2 Canyon, Nespelem, Disautel Pass, Waterville, Mansfield, and Badger Mountain Road. * WHEN...Until noon PST today. * ELEVATION...Accumulations less than an inch are likely for elevations below 2000 feet around Wenatchee, Chelan, and Brewster. Slushy accumulations of an inch or two will be possible around Omak and Oroville below 2000 feet. * IMPACTS...Plan on slippery road 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. && $$ IDZ001-WAZ037-042000- /O.CON.KOTX.WW.Y.0002.000000T0000Z-210104T2000Z/ Northern Panhandle-Northeast Mountains- Including the following locations Priest River, Eastport, Schweitzer Mountain Road, Newport, Springdale-Hunters Road, Orin-Rice Road, and Flowery Trail Road 513 AM PST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY ABOVE 2000 FEET... * WHAT...Snow above 2000 feet. Total snow accumulations of up to 3 inches valleys. Accumulations of 6 to 12 inches in the mountains. * WHERE...Priest River, Eastport, Schweitzer Mountain Road, Newport, Springdale-Hunters Road, Orin-Rice Road, and Flowery Trail Road. * WHEN...Until noon PST today. * IMPACTS...Plan on slippery road conditions. Winter driving conditions expected for travel above 3000 feet. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
402 WWUS46 KOTX 042005 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 1205 PM PST Mon Jan 4 2021 WAZ041-043-044-042115- /O.EXP.KOTX.WW.Y.0002.000000T0000Z-210104T2000Z/ Wenatchee Area-Okanogan Valley-Waterville Plateau- Including the following locations Number 1 Canyon, Number 2 Canyon, Nespelem, Disautel Pass, Waterville, Mansfield, and Badger Mountain Road 1205 PM PST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY WILL EXPIRE AT NOON PST TODAY... Additional lowland accumulations will be an inch or less around Omak, Brewster, Chelan, and Wenatchee this afternoon as temperatures climb into the mid 30s. $$ IDZ001-WAZ037-042115- /O.EXP.KOTX.WW.Y.0002.000000T0000Z-210104T2000Z/ Northern Panhandle-Northeast Mountains- Including the following locations Priest River, Eastport, Schweitzer Mountain Road, Newport, Springdale-Hunters Road, Orin-Rice Road, and Flowery Trail Road 1205 PM PST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY WILL EXPIRE AT NOON PST TODAY ABOVE 2000 FEET... Precipitation this afternoon into early this evening will fall in the form of rain or a rain-snow mix below 3000 feet around Colville, Northport, Metaline Falls, Bonners Ferry and Sandpoint with little additional accumulation. For nearby mountains with elevations above 3500 feet, an additional 5 to 10 inches of accumulation is likely this afternoon into early this evening. $$ WAZ042-050015- /O.CON.KOTX.WS.W.0002.000000T0000Z-210105T0300Z/ East Slopes Northern Cascades- Including the following locations Leavenworth, Mazama, Twisp, Winthrop, Stehekin, Conconully, Blewett Pass, Loup Loup Pass, Stevens Pass, Plain, and Holden Village 1205 PM PST Mon Jan 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM PST THIS EVENING... * WHAT...Heavy snow. From noon to 7 PM, additional snow accumulations of 2 to 4 inches in the valleys. Accumulations of 5 to 10 inches in the mountains. * WHERE...Mazama, Twisp, Winthrop, Stehekin, Conconully, Blewett Pass, Loup Loup Pass, Stevens Pass, and Holden Village. * WHEN...Until 7 PM PST this evening. * IMPACTS...Motorists should expect winter driving conditions Today. Over a foot of new snow will be likely for Stevens Pass into this evening. 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. && $$ WAZ038-050015- /O.CON.KOTX.WS.W.0002.000000T0000Z-210105T0300Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 1205 PM PST Mon Jan 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM PST THIS EVENING... * WHAT...Heavy snow. Total snow accumulations of 3 to 6 inches valleys above 2500 feet. Mountain accumulations of 6 to 10 inches. * WHERE...Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...Until 7 PM PST this evening. * IMPACTS...Motorists should expect winter driving conditions Today. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
543 WWUS46 KOTX 042353 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 353 PM PST Mon Jan 4 2021 WAZ042-050300- /O.CON.KOTX.WS.W.0002.000000T0000Z-210105T0300Z/ East Slopes Northern Cascades- Including the following locations Stevens Pass and Holden Village 353 PM PST Mon Jan 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM PST THIS EVENING... * WHAT...Snow. An additional 1 to 4 inches for the mountains along the Cascade Crest. * WHERE...Stevens Pass. * WHEN...Until 7 PM PST this evening. * IMPACTS...Motorists should expect winter driving conditions into the evening. 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. && $$ WAZ038-050300- /O.CON.KOTX.WS.W.0002.000000T0000Z-210105T0300Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 353 PM PST Mon Jan 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM PST THIS EVENING... * WHAT...Snow. An additional 1 to 2 inches in the mountains. * WHERE...Highway 20 Wauconda Summit and Sherman Pass. * WHEN...Until 7 PM PST this evening. * IMPACTS...Motorists should expect winter driving conditions Today. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
792 WWUS46 KOTX 050300 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 700 PM PST Mon Jan 4 2021 .Snow will continue tapering off tonight across the northern mountains. WAZ042-050400- /O.EXP.KOTX.WS.W.0002.000000T0000Z-210105T0300Z/ East Slopes Northern Cascades- Including the following locations Stevens Pass and Holden Village 700 PM PST Mon Jan 4 2021 ...WINTER STORM WARNING WILL EXPIRE AT 7 PM PST THIS EVENING... Snow is winding down across the eastern slopes of the Cascades including Stevens Pass and will continue this trend overnight. Snowfall amounts in the next few hours will be light in accumulation. Winter driving conditions may still exist on mountain passes and especially in areas of snow covered roads. $$ WAZ038-050400- /O.EXP.KOTX.WS.W.0002.000000T0000Z-210105T0300Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 700 PM PST Mon Jan 4 2021 ...WINTER STORM WARNING WILL EXPIRE AT 7 PM PST THIS EVENING... Snow is winding down across the northern mountains including Highway 20 over Wauconda Summit and Sherman Pass, and will continue this trend overnight. Snowfall amounts in the next few hours will be light in accumulation. Winter driving conditions may still exist on mountain passes and especially in areas of snow covered roads. $$
The office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 3, 5:45 AM PST | Winter Storm Watch | OTX | Ferry, Okanogan | 9 hr |
| Jan 3, 3:11 PM PST | Winter Weather Advisory | OTX | Chelan, Douglas, Grant, Okanogan, Pend Oreille, Spokane and 1 more | 21 hr |
| Jan 3, 3:56 PM PST | Flash Flood Watch | OTX | Whitman | 31 hr |
Nearby
Winter 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.