Alert archive / Washington / Winter Storm Warnings in 2021
Winter Storm Warning 10, NWS Spokane, WA
NWS Spokane, WA issued this winter storm warning at Nov 8, 2021, 2:21 PM PST for Chelan County, Washington. It took effect at Nov 9, 2021, 1:00 AM PST. It was in force for 24 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
- Nov 8, 2021, 2:21 PM PST (22:21 UTC)
- In effect from
- Nov 9, 2021, 1:00 AM PST
- Expired
- Nov 10, 2021, 1:00 AM PST
- In force
- 24 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 22:25 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, 10.4 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
- 583 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 248 m²/s²
- 0-3 km storm-relative helicity
- 348 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
379 WWUS46 KOTX 082221 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 221 PM PST Mon Nov 8 2021 WAZ048-091300- /O.UPG.KOTX.WW.Y.0029.211109T0600Z-211109T1800Z/ /O.NEW.KOTX.WS.W.0010.211109T0900Z-211110T0900Z/ Western Chelan County- Including the cities of Holden Village, Stehekin, and Stevens Pass 221 PM PST Mon Nov 8 2021 ...WINTER STORM WARNING IN EFFECT FROM 1 AM TUESDAY TO 1 AM PST WEDNESDAY... * WHAT...Heavy snow expected. Total snow accumulations between 8 and 14 inches. Winds gusting as high as 35 mph. * WHERE...Holden Village and Stevens Pass. * WHEN...From 1 AM Tuesday to 1 AM PST Wednesday. * IMPACTS...Roads will likely become slick and hazardous. Travel could be very difficult to impossible. * ADDITIONAL DETAILS...Melting snow may occur over Stevens Pass as temperatures warm in the afternoon on Tuesday, but then become snow covered again as temperatures cool Tuesday 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. && $$ WAZ038-091300- /O.EXB.KOTX.WW.Y.0029.211109T1100Z-211109T1800Z/ Okanogan Highlands- Including the cities of Wauconda, Boulder Creek Road, Chesaw Road, Republic, Sherman Pass, Highway 20 Wauconda Summit, and Inchelium 221 PM PST Mon Nov 8 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 3 AM TO 10 AM PST TUESDAY... * WHAT...Snow expected. Total snow accumulations up to two inches in the valleys and 2 to 4 inches in the mountains. * WHERE...Wauconda, Boulder Creek Road, Chesaw Road, Republic, Sherman Pass, Highway 20 Wauconda Summit. * WHEN...From 3 AM to 10 AM PST Tuesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slippery, increasing your risk of a fall and injury. && $$ WAZ047-091300- /O.EXT.KOTX.WW.Y.0029.211109T0900Z-211109T1800Z/ Central Chelan County- Including the cities of Plain and Leavenworth 221 PM PST Mon Nov 8 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 1 AM TO 10 AM PST TUESDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches. * WHERE...Plain and Leavenworth. * WHEN...From 1 AM to 10 AM PST Tuesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday 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. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slippery, increasing your risk of a fall and injury. && $$ WAZ049-091300- /O.EXT.KOTX.WW.Y.0029.211109T1100Z-211110T0900Z/ Western Okanogan County- Including the cities of Winthrop, Methow, Twisp, Mazama, Conconully, and Loup Loup Pass 221 PM PST Mon Nov 8 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 3 AM TUESDAY TO 1 AM PST WEDNESDAY... * WHAT...Snow expected. Total snow accumulations between 2 and 5 inches in the Methow Valley and Loup Loup Pass, and 5 to 10 inches over Washington Pass. * WHERE...Winthrop, Methow, Twisp, Mazama, Conconully, and Loup Loup Pass. * WHEN...From 3 AM Tuesday to 1 AM PST Wednesday. * IMPACTS...Roads will likely become slick and hazardous. Travel could be very difficult. The hazardous conditions could impact the Tuesday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slippery, increasing your risk of a fall and injury. && $$ SVH
4 follow-up statements
826 WWUS46 KOTX 091058 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 258 AM PST Tue Nov 9 2021 WAZ048-091900- /O.CON.KOTX.WS.W.0010.000000T0000Z-211110T0900Z/ Western Chelan County- Including the cities of Holden Village, Stehekin, and Stevens Pass 258 AM PST Tue Nov 9 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 1 AM PST WEDNESDAY... * WHAT...Heavy snow. Accumulations between 8 and 14 inches in the mountains. Accumulations of 1 to 4 inches around Stehekin and Holden Village. Mountain ridge winds gusting as high as 35 mph. * WHERE...Holden Village, Stehekin, and Stevens Pass. * WHEN...Until 1 AM PST Wednesday. * IMPACTS...Winter driving conditions are expected today and tonight over the mountain passes. * ADDITIONAL DETAILS...Motorists should be prepared for snow over 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. && $$ WAZ047-091800- /O.CON.KOTX.WW.Y.0029.000000T0000Z-211109T1800Z/ Central Chelan County- Including the cities of Plain and Leavenworth 258 AM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST THIS MORNING... * WHAT...Snow. Accumulations between 1 and 3 inches. * WHERE...Plain, Lake Wenatchee and Leavenworth. * WHEN...Until 10 AM PST this morning. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Plan on slippery road conditions. The hazardous conditions could impact the Tuesday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slick, increasing your risk of a fall and injury. && $$ WAZ038-091800- /O.CON.KOTX.WW.Y.0029.211109T1100Z-211109T1800Z/ Okanogan Highlands- Including the cities of Wauconda, Boulder Creek Road, Chesaw Road, Republic, Sherman Pass, Highway 20 Wauconda Summit, and Inchelium 258 AM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST THIS MORNING... * WHAT...Snow expected. Total snow accumulations up to 3 inches. * WHERE...Wauconda, Boulder Creek Road, Chesaw Road, Republic, Sherman Pass, Highway 20 Wauconda Summit, and Inchelium. * WHEN...Until 10 AM PST this morning. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Winter driving conditions could impact the Tuesday morning commute. * ADDITIONAL DETAILS...Motorists should be prepared for snow over Sherman 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. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slick, increasing your risk of a fall and injury. && $$ WAZ049-091900- /O.CON.KOTX.WW.Y.0029.211109T1100Z-211110T0900Z/ Western Okanogan County- Including the cities of Winthrop, Methow, Twisp, Mazama, Conconully, and Loup Loup Pass 258 AM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM PST WEDNESDAY... * WHAT...Snow expected. Total snow accumulations between 6 and 12 inches in the mountains. Morning snow accumulation of 1 to 3 inches in the Methow Valley. * WHERE...Winthrop, Methow, Twisp, Mazama, Conconully, and Loup Loup Pass. * WHEN...Until 1 AM PST Wednesday. * IMPACTS...Winter driving conditions could impact the Tuesday morning commute. * ADDITIONAL DETAILS...Motorists should be prepared for snow over Washington Pass and Loup Loup Pass today and through tonight. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slick, increasing your risk of a fall and injury. && $$ GKOCH
931 WWUS46 KOTX 091212 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 412 AM PST Tue Nov 9 2021 WAZ048-091900- /O.CON.KOTX.WS.W.0010.000000T0000Z-211110T0900Z/ Western Chelan County- Including the cities of Holden Village, Stehekin, and Stevens Pass 412 AM PST Tue Nov 9 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 1 AM PST WEDNESDAY... * WHAT...Heavy snow. Accumulations between 8 and 14 inches in the mountains. Accumulations of 1 to 4 inches around Stehekin and Holden Village. Mountain ridge winds gusting as high as 35 mph. * WHERE...Holden Village, Stehekin, and Stevens Pass. * WHEN...Until 1 AM PST Wednesday. * IMPACTS...Winter driving conditions are expected today and tonight over the mountain passes. * ADDITIONAL DETAILS...Motorists should be prepared for snow over 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. && $$ WAZ038-091800- /O.CON.KOTX.WW.Y.0029.000000T0000Z-211109T1800Z/ Okanogan Highlands- Including the cities of Wauconda, Boulder Creek Road, Chesaw Road, Republic, Sherman Pass, Highway 20 Wauconda Summit, and Inchelium 412 AM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST THIS MORNING... * WHAT...Snow expected. Total snow accumulations up to two inches in the valleys and 2 to 4 inches in the mountains. * WHERE...Wauconda, Boulder Creek Road, Chesaw Road, Republic, Sherman Pass, Highway 20 Wauconda Summit, and Inchelium. * WHEN...Until 10 AM PST this morning. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Winter driving conditions could impact the Tuesday morning commute. * ADDITIONAL DETAILS...Motorists should be prepared for snow over Sherman Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slick, increasing your risk of a fall and injury. && $$ WAZ047-091800- /O.CON.KOTX.WW.Y.0029.000000T0000Z-211109T1800Z/ Central Chelan County- Including the cities of Plain and Leavenworth 412 AM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST THIS MORNING... * WHAT...Snow. Accumulations up to 3 inches. * WHERE...Plain and Leavenworth mainly elevations above 2000 feet. * WHEN...Until 10 AM PST this morning. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday 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. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slick, increasing your risk of a fall and injury. && $$ WAZ049-091900- /O.CON.KOTX.WW.Y.0029.000000T0000Z-211110T0900Z/ Western Okanogan County- Including the cities of Winthrop, Methow, Twisp, Mazama, Conconully, and Loup Loup Pass 412 AM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM PST WEDNESDAY... * WHAT...Snow expected. Total snow accumulations between 6 and 12 inches in the mountains. Morning snow accumulation of 1 to 3 inches in the Methow Valley. * WHERE...Winthrop, Methow, Twisp, Mazama, Conconully, and Loup Loup Pass. * WHEN...Until 1 AM PST Wednesday. * IMPACTS...Winter driving conditions could impact the Tuesday morning commute. * ADDITIONAL DETAILS...Motorists should be prepared for snow over Washington Pass and Loup Loup Pass today and through tonight. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slick, increasing your risk of a fall and injury. && $$ GKOCH
163 WWUS46 KOTX 091747 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 947 AM PST Tue Nov 9 2021 WAZ038-047-091900- /O.EXP.KOTX.WW.Y.0029.000000T0000Z-211109T1800Z/ Okanogan Highlands-Central Chelan County- Including the cities of Wauconda, Plain, Leavenworth, Chesaw Road, Republic, Boulder Creek Road, Sherman Pass, Highway 20 Wauconda Summit, and Inchelium 947 AM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 10 AM PST THIS MORNING... Snow has decreased in intensity and/or has changed over to rain. With no additional significant snow accumulations expected this winter weather advisory will be allowed to expire. $$ WAZ048-100200- /O.CON.KOTX.WS.W.0010.000000T0000Z-211110T0900Z/ Western Chelan County- Including the cities of Holden Village, Stehekin, and Stevens Pass 947 AM PST Tue Nov 9 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 1 AM PST WEDNESDAY... * WHAT...Heavy snow. Additional snow accumulations between 5 and 8 inches. Winds gusting as high as 40 mph. * WHERE...Holden Village, Stehekin, and Stevens Pass. * WHEN...Until 1 AM PST Wednesday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. The hazardous conditions could impact the Tuesday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WAZ049-100200- /O.CON.KOTX.WW.Y.0029.000000T0000Z-211110T0900Z/ Western Okanogan County- Including the cities of Loup Loup Pass 947 AM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM PST WEDNESDAY... * WHAT...Snow. Additional snow accumulations up to 8 inches above 3000 feet. * WHERE...Loup Loup Pass. * WHEN...Until 1 AM PST Wednesday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult. The hazardous conditions could impact the Tuesday evening 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. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be icy and slippery, increasing your risk of a fall and injury. && $$ RP
768 WWUS46 KOTX 092122 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 122 PM PST Tue Nov 9 2021 WAZ048-100900- /O.CON.KOTX.WS.W.0010.000000T0000Z-211110T0900Z/ Western Chelan County- Including the cities of Holden Village, Stehekin, and Stevens Pass 122 PM PST Tue Nov 9 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 1 AM PST WEDNESDAY... * WHAT...Heavy snow. Additional snow accumulations between 5 and 8 inches mainly above 3000 feet. Winds gusting as high as 40 mph. * WHERE...Holden Village, Stehekin, and Stevens Pass. * WHEN...Until 1 AM PST Wednesday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. The hazardous conditions could impact the Tuesday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WAZ049-100900- /O.CON.KOTX.WW.Y.0029.000000T0000Z-211110T0900Z/ Western Okanogan County- Including the cities of Loup Loup Pass 122 PM PST Tue Nov 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM PST WEDNESDAY... * WHAT...Snow. Additional snow accumulations between 5 and 8 inches mainly above 3000 feet. * WHERE...Loup Loup Pass. * WHEN...Until 1 AM PST Wednesday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult. The hazardous conditions could impact the Tuesday evening 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. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be icy and slippery, increasing your risk of a fall and injury. && $$ RP
The office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 8, 6:20 AM PST | Winter Weather Advisory | OTX | Chelan, Ferry, Okanogan | 43 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.