Alert archive / Washington / Winter Storm Warnings in 2021
Winter Storm Warning 3, NWS Spokane, WA
NWS Spokane, WA issued this winter storm warning at Jan 11, 2021, 2:56 AM PST for Ferry County, Okanogan County, Washington. It took effect at Jan 11, 2021, 1:00 PM PST. It was in force for 23 hr. 13 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 11, 2021, 2:56 AM PST (10:56 UTC)
- In effect from
- Jan 11, 2021, 1:00 PM PST
- Expired
- Jan 12, 2021, 12:09 PM PST
- In force
- 23 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 10:55 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 12, 7:00 AM PST | SNOW 4.5 | 4 W Boyds, WA | COCORAHS STATION WA-FY-8 10.2 NW KETTLE FALLS. |
| Jan 12, 7:00 AM PST | SNOW 4.5 | 7 Wsw Malo, WA | COCORAHS STATION WA-FY-10 7.6 N REPUBLIC. |
| Jan 12, 7:00 AM PST | SNOW 4.5 | Boyds, WA | |
| Jan 12, 7:00 AM PST | SNOW 6.5 | 1 Ese Twisp, WA | COCORAHS STATION WA-OK-33 TWISP 1.3 ESE. |
| Jan 12, 7:00 AM PST | SNOW 9.5 | 6 Ese Mazama, WA | COCORAHS STATION WA-OK-16 6.8 NNW WINTHROP. |
| Jan 12, 8:00 AM PST | SNOW 5 | 7 S Molson, WA | ELEVATION 3400 FT. |
| Jan 12, 8:00 AM PST | SNOW 7 | 3 Ese Carlton, WA | REPORTED AT TEXAS CREEK ROAD CARLTON WA... STILL SNOWING. |
| Jan 12, 8:00 AM PST | SNOW 8 | 1 Nw Winthrop, WA | REPORTED AT 24 W CHEWUCH RD, WINTHROP, WA 98862 FROM THE WINTHROP FMO. |
| Jan 12, 8:30 AM PST | SNOW 4 | 2 E Wauconda, WA | |
| Jan 12, 8:30 AM PST | SNOW 10 | 1 Wnw Mazama, WA | |
| Jan 12, 8:31 AM PST | SNOW 7 | 1 W Twisp, WA | |
| Jan 12, 9:33 AM PST | SNOW 12 | 2 Ese Mazama, WA | VIA SOCIAL MEDIA. |
| Jan 12, 10:30 AM PST | HEAVY SNOW 5.5 | 3 Nw Malo, WA |
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 00:00Z, 10.9 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
- 944 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
432 WWUS46 KOTX 111056 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 256 AM PST Mon Jan 11 2021 ...HEAVY WET SNOW POSSIBLE MONDAY NIGHT AND TUESDAY... .A very moist storm is likely to bring moderate to heavy precipitation Monday night into Tuesday. Precipitaiton in the Okanogan Highlands, Methow Valley, and along the Cascade Crest is expected to fall as snow before transitioning to rain late Tuesday. Snow rates could approach 1-2 inches per hour. WAZ042-112200- /O.UPG.KOTX.WS.A.0003.210112T0000Z-210113T0000Z/ /O.NEW.KOTX.WS.W.0003.210111T2100Z-210113T0000Z/ East Slopes Northern Cascades- Including the following locations Mazama, Twisp, Winthrop, Stehekin, Conconully, Loup Loup Pass, Stevens Pass, Plain, and Holden Village 256 AM PST Mon Jan 11 2021 ...WINTER STORM WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 4 PM PST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations of 5 to 10 inches in the valleys, and 8 to 16 inches in the mountains. Locally up to two feet above 4000 feet. * WHERE...Mazama, Twisp, Winthrop, Stehekin, Conconully, Loup Loup Pass, Stevens Pass, Plain, and Holden Village. * WHEN...From 1 PM this afternoon to 4 PM PST Tuesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Snow rates of one to two inches per hour coupled with the weight of the snow could result in tree damage and isolated power outages. 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. && $$ WAZ038-112200- /O.CON.KOTX.WS.A.0003.210112T0600Z-210113T0000Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 256 AM PST Mon Jan 11 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH TUESDAY AFTERNOON... * WHAT...Heavy snow possible. Total snow accumulations of 4 to 9 inches possible. * WHERE...Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...From Monday evening through Tuesday afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Snow rates of one to two inches per hour coupled with the weight of the snow could result in tree damage and isolated power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
4 follow-up statements
604 WWUS46 KOTX 112300 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 300 PM PST Mon Jan 11 2021 ...HEAVY WET SNOW TONIGHT AND TUESDAY... .A very moist storm is likely to bring moderate to heavy precipitation overnight into Tuesday. Precipitaiton in the Okanogan Highlands, Methow Valley, and along the Cascade Crest is expected to fall as snow before transitioning to rain late Tuesday. Snow rates could approach 1-2 inches per hour. WAZ038-120700- /O.UPG.KOTX.WS.A.0003.210112T0600Z-210113T0000Z/ /O.EXB.KOTX.WS.W.0003.210112T0600Z-210113T0000Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 300 PM PST Mon Jan 11 2021 ...WINTER STORM WARNING IN EFFECT FROM 10 PM THIS EVENING TO 4 PM PST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations 3 to 7 inches with locally up to a foot in the higher terrain. * WHERE...Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...From 10 PM this evening to 4 PM PST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Snow rates of one to two inches per hour coupled with the weight of the snow could result in tree damage and isolated power outages. 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. && $$ WAZ042-120700- /O.CON.KOTX.WS.W.0003.000000T0000Z-210113T0000Z/ East Slopes Northern Cascades- Including the following locations Mazama, Twisp, Winthrop, Stehekin, Conconully, Loup Loup Pass, Stevens Pass, Plain, and Holden Village 300 PM PST Mon Jan 11 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations of 5 to 10 inches in the valleys, and 8 to 16 inches in the mountains. Locally up to two feet above 5000 feet. * WHERE...Mazama, Twisp, Winthrop, Stehekin, Conconully, Loup Loup Pass, Stevens Pass, Plain, and Holden Village. * WHEN...From 1 PM this afternoon to 4 PM PST Tuesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Snow rates of one to two inches per hour coupled with the weight of the snow could result in tree damage and isolated power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
160 WWUS46 KOTX 120552 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 952 PM PST Mon Jan 11 2021 ...HEAVY WET SNOW TONIGHT AND TUESDAY... .A very moist storm is likely to bring moderate to heavy precipitation overnight into Tuesday. Precipitaiton in the Okanogan Highlands, Methow Valley, and along the Cascade Crest is expected to fall as snow before transitioning to rain late Tuesday. Snow rates could approach 1-2 inches per hour. WAZ038-121400- /O.CON.KOTX.WS.W.0003.210112T0600Z-210113T0000Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 952 PM PST Mon Jan 11 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations 3 to 7 inches with locally up to a foot in the higher terrain. * WHERE...Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...Until 4 PM PST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Snow rates of one to two inches per hour coupled with the weight of the snow could result in tree damage and isolated power outages. 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. && $$ WAZ042-121400- /O.CON.KOTX.WS.W.0003.000000T0000Z-210113T0000Z/ East Slopes Northern Cascades- Including the following locations Mazama, Twisp, Winthrop, Stehekin, Conconully, Loup Loup Pass, Stevens Pass, Plain, and Holden Village 952 PM PST Mon Jan 11 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST TUESDAY... * WHAT...Heavy snow. Additional snow accumulations of 2 to 7 inches in the valleys, and 7 to 15 inches in the mountains. * WHERE...Mazama, Twisp, Winthrop, Stehekin, Conconully, Loup Loup Pass, Stevens Pass, Plain, and Holden Village. * WHEN...Until 4 PM PST Tuesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Snow rates of one to two inches per hour coupled with the weight of the snow could result in tree damage and isolated power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
013 WWUS46 KOTX 121246 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 446 AM PST Tue Jan 12 2021 ...HEAVY WET SNOW THROUGH TODAY... .A very moist storm is likely to bring moderate to heavy precipitation through Tuesday. Precipitaiton in the Okanogan Highlands, Methow Valley, and along the Cascade Crest is expected to fall as snow before transitioning to rain late Tuesday. Snow rates could approach 1-2 inches per hour. WAZ038-042-130000- /O.CON.KOTX.WS.W.0003.000000T0000Z-210113T0000Z/ Okanogan Highlands-East Slopes Northern Cascades- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, Sherman Pass, Mazama, Twisp, Winthrop, Stehekin, Conconully, Loup Loup Pass, Stevens Pass, Plain, and Holden Village 446 AM PST Tue Jan 12 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS AFTERNOON... * WHAT...Heavy snow expected. Additional snow accumulations 3 to 7 inches with locally up to a foot in the higher terrain. * WHERE...Mazama, Twisp, Winthrop, Stehekin, Loup Loup Pass, Stevens Pass, Plain, Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...Until 4 PM PST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Snow rates of one to two inches per hour coupled with the weight of the snow could result in tree damage and isolated power outages. 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. && $$
058 WWUS46 KOTX 122009 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 1209 PM PST Tue Jan 12 2021 WAZ038-042-122115- /O.CAN.KOTX.WS.W.0003.000000T0000Z-210113T0000Z/ Okanogan Highlands-East Slopes Northern Cascades- 1209 PM PST Tue Jan 12 2021 ...WINTER STORM WARNING IS CANCELLED... Snowfall has changed over to rain and/or decreased substantially in intensity for most locations, therefore the winter storm warning has been cancelled. $$
The office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 11, 2:58 PM PST | High Wind Watch | OTX | Asotin, Garfield, Lincoln, Pend Oreille, Spokane, Stevens and 1 more | 14 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.