Alert archive / Washington / Winter Storm Warnings in 2021
Winter Storm Warning 11, NWS Spokane, WA
NWS Spokane, WA issued this winter storm warning at Dec 7, 2021, 2:14 PM PST for Chelan County, Washington. It took effect at Dec 8, 2021, 4:00 AM PST. It was in force for 23 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 7, 2021, 2:14 PM PST (22:14 UTC)
- In effect from
- Dec 8, 2021, 4:00 AM PST
- Expired
- Dec 9, 2021, 2:45 AM PST
- In force
- 23 hr
- Issued by
- NWS Spokane, WA
County Chelan County, WA
The radar
The Seattle radar (KATX), 144 km from the middle of the area, began a volume at 22:16 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
Quillayute State, WA (KUIL), launched 12:00Z, 10.2 hours before the alert went out and 289 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
- 575 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
516 WWUS46 KOTX 072214 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 214 PM PST Tue Dec 7 2021 ...LIGHT WINTRY MIX FOR NORTHEASTERN WASHINGTON AND NORTH IDAHO OVERNIGHT INTO WEDNESDAY MORNING. HEAVY SNOW ALONG THE CASCADE CREST WEDNESDAY INTO THURSDAY. ... WAZ048-080800- /O.NEW.KOTX.WS.W.0011.211208T1200Z-211209T1800Z/ Western Chelan County- Including the cities of Stevens Pass 214 PM PST Tue Dec 7 2021 ...WINTER STORM WARNING IN EFFECT FROM 4 AM WEDNESDAY TO 10 AM PST THURSDAY FOR THE CASCADE CREST & STEVENS PASS... * WHAT...Heavy snow expected Cascade Crest & Stevens Pass. Total snow accumulations between 8 and 15 inches. Winds gusting 35 to as high as 50 mph. * WHERE...Stevens Pass. * WHEN...From 4 AM Wednesday to 10 AM PST Thursday. * IMPACTS...Roads will likely become slick and snow covered. Travel could be very difficult. Gusty winds could bring down tree branches and create blowing snow. 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. && $$ IDZ001-WAZ037-080800- /O.NEW.KOTX.WW.Y.0037.211208T0800Z-211208T1500Z/ Northern Panhandle-Northeast Mountains- Including the cities of Eastport, Sandpoint, Colville, Northport, Bonners Ferry, Orin-Rice Road, Athol, Newport, Flowery Trail Road, Chewelah, Deer Park, Springdale-Hunters Road, Kettle Falls, Schweitzer Mountain Road, and Priest River 214 PM PST Tue Dec 7 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 7 AM PST WEDNESDAY... * WHAT...Light wintry mix of snow and freezing rain expected. Total snow accumulations up to two inches. Ice accumulations of a glaze to two hundreths possible. * WHERE...Eastport, Sandpoint, Colville, Northport, Bonners Ferry, Orin-Rice Road, Athol, Newport, Flowery Trail Road, Chewelah, Deer Park, Springdale-Hunters Road, Kettle Falls, Schweitzer Mountain Road, and Priest River. * WHEN...From Midnight tonight to 7 AM PST Wednesday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick. Plan on slippery road conditions. The hazardous conditions could impact the Wednesday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ SB
5 follow-up statements
175 WWUS46 KOTX 080746 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 1146 PM PST Tue Dec 7 2021 ...LIGHT WINTRY MIX FOR NORTHEASTERN WASHINGTON AND NORTH IDAHO OVERNIGHT INTO WEDNESDAY MORNING. HEAVY SNOW ALONG THE CASCADE CREST WEDNESDAY INTO THURSDAY... WAZ048-081600- /O.CON.KOTX.WS.W.0011.211208T1200Z-211209T1800Z/ Western Chelan County- Including the cities of Stevens Pass 1146 PM PST Tue Dec 7 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 4 AM WEDNESDAY TO 10 AM PST THURSDAY CASCADE CREST & STEVENS PASS... * WHAT...Heavy snow expected Cascade Crest & Stevens Pass. Total snow accumulations between 8 and 15 inches. Winds gusting 35 to as high as 50 mph. * WHERE...Stevens Pass. * WHEN...From 4 AM Wednesday to 10 AM PST Thursday. * IMPACTS...Roads will likely become slick and snow covered. Travel could be very difficult. Gusty winds could bring down tree branches and create blowing snow. 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. && $$ IDZ001-WAZ037-081500- /O.CON.KOTX.WW.Y.0037.211208T0800Z-211208T1500Z/ Northern Panhandle-Northeast Mountains- Including the cities of Eastport, Sandpoint, Colville, Northport, Bonners Ferry, Orin-Rice Road, Athol, Newport, Flowery Trail Road, Chewelah, Deer Park, Springdale-Hunters Road, Kettle Falls, Schweitzer Mountain Road, and Priest River 1146 PM PST Tue Dec 7 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST WEDNESDAY... * WHAT...Light wintry mix of snow and freezing rain or drizzle expected. Total snow accumulations up to two inches. Ice accumulations of a glaze to two hundreths possible. * WHERE...Eastport, Sandpoint, Colville, Northport, Bonners Ferry, Orin-Rice Road, Athol, Newport, Flowery Trail Road, Chewelah, Deer Park, Springdale-Hunters Road, Kettle Falls, Schweitzer Mountain Road, and Priest River. * WHEN...Until 7 AM PST Wednesday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick. Plan on slippery road conditions. The hazardous conditions could impact the Wednesday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ SVH
762 WWUS46 KOTX 081445 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 645 AM PST Wed Dec 8 2021 IDZ001-WAZ037-081545- /O.EXP.KOTX.WW.Y.0037.000000T0000Z-211208T1500Z/ Northern Panhandle-Northeast Mountains- Including the cities of Eastport, Sandpoint, Colville, Northport, Bonners Ferry, Orin-Rice Road, Athol, Newport, Flowery Trail Road, Chewelah, Deer Park, Springdale-Hunters Road, Kettle Falls, Schweitzer Mountain Road, and Priest River 645 AM PST Wed Dec 8 2021 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 7 AM PST THIS MORNING... Temperatures have slowly moderated through the night with less of a risk of freezing rain or freezing drizzle. Isolated snow showers at times this morning, but not enough to impact travel. $$ WAZ048-082245- /O.CON.KOTX.WS.W.0011.000000T0000Z-211209T1800Z/ Western Chelan County- Including the cities of Stevens Pass 645 AM PST Wed Dec 8 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THURSDAY CASCADE CREST & STEVENS PASS... * WHAT...Heavy snow Cascade Crest & Stevens Pass. Additional snow accumulations between 3 and 13 inches. Winds gusting 35 to as high as 50 mph. * WHERE...Stevens Pass. * WHEN...Until 10 AM PST Thursday. * IMPACTS...Roads will likely become slick and snow covered. Travel could be very difficult. Gusty winds could bring down tree branches and create blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ SVH
835 WWUS46 KOTX 081906 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 1106 AM PST Wed Dec 8 2021 WAZ048-090315- /O.CON.KOTX.WS.W.0011.000000T0000Z-211209T1800Z/ Western Chelan County- Including the cities of Stevens Pass 1106 AM PST Wed Dec 8 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THURSDAY CASCADE CREST & STEVENS PASS... * WHAT...Heavy snow Cascade Crest & Stevens Pass. Additional snow accumulations between 8 and 12 inches from Wednesday afternoon to Thursday morning. * WHERE...Stevens Pass. * WHEN...Until 10 AM PST Thursday. * IMPACTS...Motorists should plan on winter driving conditions over Stevens Pass. * ADDITIONAL DETAILS...A persistent convergence zone will continue to impact the area between and including Stevens and Snoqualmie Pass. Snowfall rates of 1 to 2 inches per hour remain possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ GKOCH
795 WWUS46 KOTX 090240 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 640 PM PST Wed Dec 8 2021 WAZ048-091445- /O.CON.KOTX.WS.W.0011.000000T0000Z-211209T1800Z/ Western Chelan County- Including the cities of Stevens Pass 640 PM PST Wed Dec 8 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THURSDAY CASCADE CREST & STEVENS PASS... * WHAT...Heavy snow Cascade Crest & Stevens Pass. Additional snow accumulations between 5 and 10 inches through Thursday morning. Winds gusting as high as 35 mph. * WHERE...Stevens Pass. * WHEN...Until 10 AM PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult. The hazardous conditions could impact the Thursday morning commute. * ADDITIONAL DETAILS...A persistent convergence zone will continue to impact the area between and including Stevens and Snoqualmie Pass. Snowfall rates of 1 to 2 inches per hour remain possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ JCLEV
872 WWUS46 KOTX 091045 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 245 AM PST Thu Dec 9 2021 ...SNOW SHOWERS THURSDAY FOLLOWED BY A WINTER STORM BRINGING HEAVY SNOW FRIDAY NIGHT THROUGH SATURDAY... .Snow showers will continue over the Cascade crest Thursday into Thursday evening at the Cascades crest resulting in difficult travel at times over Stevens Pass. Snow showers will also develop over the Central Panhandle Mountains Thursday afternoon and evening with bursts of heavy snow at times. A winter storm will then move into the Cascades by Friday evening with snow becoming heavy Friday night through Saturday. Travel is not recommended over Stevens Pass during this winter storm. Snow is expected to decrease overnight Saturday into Sunday. WAZ048-092330- /O.CAN.KOTX.WS.W.0011.000000T0000Z-211209T1800Z/ /O.NEW.KOTX.WW.Y.0038.211209T1045Z-211210T0600Z/ /O.NEW.KOTX.WS.A.0007.211211T0600Z-211212T0600Z/ Western Chelan County- Including the cities of Holden Village, Stehekin, and Stevens Pass 245 AM PST Thu Dec 9 2021 ...WINTER STORM WARNING IS CANCELLED... ...WINTER WEATHER ADVISORY REPLACING WINTER STORM WARNING IN EFFECT UNTIL 10 PM PST THIS EVENING... ...WINTER STORM WATCH IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY EVENING... * WHAT...For the Winter Weather Advisory, snow at Cascade Crest and Stevens Pass. Additional snow accumulations between 6 and 12 inches. For the Winter Storm Watch, heavy snow possible. Total snow accumulations between 1 to 2 feet possible. Winds could gust as high as 35 mph. * WHERE...Stevens Pass, Holden Village, and Stehekin. * WHEN...For the Winter Weather Advisory, until 10 PM PST this evening. For the Winter Storm Watch, from Friday evening through Saturday evening. * IMPACTS...Snow will make for difficult travel conditions through Thursday evening. Heavy snow for Friday night through Saturday could result in very difficult to impossible travel conditions. Travel over Stevens Pass is not advised during this period of heavy snow. 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. Persons should consider delaying all travel Friday night through Saturday. If travel is absolutely necessary, drive with extreme caution. Consider taking a winter storm kit along with you, including such items as tire chains, booster cables, flashlight, shovel, blankets and extra clothing. Also take water, a first aid kit, and anything else that would help you survive in case you become stranded. && $$ IDZ004-092330- /O.NEW.KOTX.WW.Y.0038.211209T2100Z-211210T0800Z/ Central Panhandle Mountains- Including the cities of Wallace, Osburn, Dobson Pass, Kellogg, Fernwood, Lookout Pass, and Mullan 245 AM PST Thu Dec 9 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO MIDNIGHT PST TONIGHT... * WHAT...Snow expected. Total snow accumulations between 2 and 6 inches. * WHERE...Wallace, Osburn, Dobson Pass, Kellogg, Fernwood, Lookout Pass, and Mullan. * WHEN...From 1 PM this afternoon to Midnight PST tonight. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Bursts of heavy snow will be possible with snow accumulations of up to 1 inch per hour. Plan on rapid changes to weather conditions for the late afternoon and evening travel period over Lookout Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WAZ047-049-092330- /O.NEW.KOTX.WS.A.0007.211211T0600Z-211212T0600Z/ Central Chelan County-Western Okanogan County- Including the cities of Winthrop, Plain, Leavenworth, Methow, Twisp, Loup Loup Pass, Conconully, and Mazama 245 AM PST Thu Dec 9 2021 ...WINTER STORM WATCH IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY EVENING... * WHAT...Heavy snow possible. Total snow accumulations between 3 and 7 inches possible in the valleys and 8 to 18 inches possible in the mountains. Winds could gust as high as 35 mph. * WHERE...Winthrop, Plain, Leavenworth, Methow, Twisp, Loup Loup Pass, Conconully, and Mazama. * WHEN...From Friday evening through Saturday evening. * IMPACTS...Travel could be very difficult to impossible. 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. Monitor the latest forecasts for updates on this situation. && $$ SVH
The office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 7, 5:35 AM PST | Winter Weather Advisory | OTX | Lincoln, Pend Oreille, Spokane, Stevens, Whitman | 5 hr |
| Dec 7, 2:14 PM PST | Winter Weather Advisory | OTX | Pend Oreille, Spokane, Stevens | 17 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.