Alert archive / Idaho / Winter Storm Warnings in 2021
Winter Storm Warning 1, NWS Spokane, WA
NWS Spokane, WA issued this winter storm warning at Jan 2, 2021, 3:18 AM PST for 4 counties in Idaho. It took effect at Jan 2, 2021, 4:00 PM PST. It was in force for 20 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
- Jan 2, 2021, 3:18 AM PST (11:18 UTC)
- In effect from
- Jan 2, 2021, 4:00 PM PST
- Expired
- Jan 3, 2021, 11:33 AM PST
- In force
- 20 hr
- Issued by
- NWS Spokane, WA
Counties Benewah County, ID, Kootenai County, ID, Latah County, ID, Shoshone County, ID
The radar
The Spokane radar (KOTX), 97 km from the middle of the area, began a volume at 11:20 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 00:00Z, 11.3 hours before the alert went out and 49 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
- 1191 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 219 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
368 WWUS46 KOTX 021118 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 318 AM PST Sat Jan 2 2021 ...SNOW IN THE MOUNTAINS THIS WEEKEND... An exiting low pressure system will result in light to moderate snowfall over the Cascades and into the Idaho Panhandle this morning. A stronger and wetter storm arrives fast on its heels with snow increasing over the mountains this afternoon and this evening. Heaviest snowfall is expected Saturday evening into Saturday night where winter travel conditions is expected along Highway 2 west of Coles Corner to Stevens Pass and for travel over Lookout Pass. IDZ004-022300- /O.UPG.KOTX.WS.A.0001.210103T0000Z-210103T1800Z/ /O.NEW.KOTX.WS.W.0001.210103T0000Z-210103T2000Z/ Central Panhandle Mountains- Including the following locations Lookout Pass 318 AM PST Sat Jan 2 2021 ...WINTER STORM WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO NOON PST SUNDAY ABOVE 4000 FEET... * WHAT...Heavy snow expected above 4000 feet. Total snow accumulations of 8 to 15 inches. Winds gusting as high as 40 mph. * WHERE...Lookout Pass. * WHEN...From 4 PM this afternoon to noon PST Sunday. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Light to moderate snow Saturday morning and afternoon will result in 3 to 5 inches of snow in the mountains. Snow becomes heavy Saturday night when winter travel conditions with hazardous travel is most likely. 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. && $$ WAZ042-022300- /O.NEW.KOTX.WW.Y.0001.210102T1800Z-210103T1800Z/ East Slopes Northern Cascades- Including the following locations Mazama, Stehekin, Stevens Pass, Plain, and Holden Village 318 AM PST Sat Jan 2 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 10 AM THIS MORNING TO 10 AM PST SUNDAY FOR THE CASCADE CREST INCLUDING HIGHWAY 2 BETWEEN COLES CORNER AND STEVENS PASS... * WHAT...Snow expected for The Cascade Crest including Highway 2 between Coles Corner and Stevens Pass. Total snow accumulations of 5 to 10 inches, except 10 to 20 inches expected above 4000 feet. Winds gusting as high as 45 mph. * WHERE...Mazama, Stehekin, Stevens Pass, Plain, and Holden Village. * WHEN...From 10 AM this morning to 10 AM PST Sunday. * IMPACTS...Travel could be very difficult. Wet heavy snow and gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Snow levels are expected to rise Saturday afternoon to between 4000 and 4500 feet. There is uncertainty if snow will transition to rain at Stevens Pass. Heavier accumulations will occur if precipitation remains as snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
4 follow-up statements
608 WWUS46 KOTX 022151 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 151 PM PST Sat Jan 2 2021 ...SNOW IN THE MOUNTAINS THIS WEEKEND... Snow will increase in the mountains through Saturday night. Winter travel conditions is expected along Highway 2 west of Coles Corner to Stevens Pass and for travel over Lookout Pass. Another round of significant snow is expected on Monday. IDZ004-030700- /O.CON.KOTX.WS.W.0001.210103T0000Z-210103T2000Z/ Central Panhandle Mountains- Including the following locations Lookout Pass 151 PM PST Sat Jan 2 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST SUNDAY ABOVE 4000 FEET... * WHAT...Heavy snow expected above 4000 feet. Total snow accumulations of 8 to 15 inches. Winds gusting as high as 40 mph. * WHERE...Lookout Pass. * WHEN...From 4 PM this afternoon to noon PST Sunday. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...The heaviest snowfall is expected overnight into early Sunday morning with snow rates of one inch per hour likely. 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. && $$ WAZ042-030700- /O.CON.KOTX.WW.Y.0001.000000T0000Z-210103T1800Z/ East Slopes Northern Cascades- Including the following locations Mazama, Stehekin, Stevens Pass, Plain, and Holden Village 151 PM PST Sat Jan 2 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST SUNDAY FOR THE CASCADE CREST INCLUDING HIGHWAY 2 BETWEEN COLES CORNER AND STEVENS PASS... * WHAT...Snow expected for The Cascade Crest including Highway 2 between Coles Corner and Stevens Pass. Total snow accumulations of 5 to 10 inches, except 10 to 20 inches expected above 4000 feet. Winds gusting as high as 45 mph. * WHERE...Mazama, Stevens Pass, Holden Village. * WHEN...From 10 AM this morning to 10 AM PST Sunday. * IMPACTS...Travel could be very difficult. Wet heavy snow and gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Snow level near 4000 to 4500 feet will result in wet snow or a rain and snow mix over Stevens Pass through the evening before changing to all snow around midnight as snow levels quickly drop to near 2000 feet. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
972 WWUS46 KOTX 030540 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 940 PM PST Sat Jan 2 2021 ...SNOW IN THE MOUNTAINS THIS WEEKEND... Snow will be heavy at times across the mountains through Saturday night. Winter travel conditions is expected along Highway 2 west of Coles Corner to Stevens Pass and for travel over Lookout Pass. Another round of significant snow is expected on Monday. IDZ004-031400- /O.CON.KOTX.WS.W.0001.000000T0000Z-210103T2000Z/ Central Panhandle Mountains- Including the following locations Lookout Pass 940 PM PST Sat Jan 2 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST SUNDAY ABOVE 4000 FEET... * WHAT...Heavy snow expected above 4000 feet. Total snow accumulations of 8 to 15 inches. Winds gusting as high as 40 mph. * WHERE...Lookout Pass. * WHEN...Through noon PST Sunday. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...The heaviest snowfall is expected overnight into early Sunday morning with snow rates of one inch per hour likely. 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. && $$ WAZ042-031400- /O.CON.KOTX.WW.Y.0001.000000T0000Z-210103T1800Z/ East Slopes Northern Cascades- Including the following locations Mazama, Stehekin, Stevens Pass, Plain, and Holden Village 940 PM PST Sat Jan 2 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST SUNDAY FOR THE CASCADE CREST INCLUDING HIGHWAY 2 BETWEEN COLES CORNER AND STEVENS PASS... * WHAT...Heavy snow expected for the Cascade Crest including Highway 2 between Coles Corner and Stevens Pass. Total snow accumulations of 6 to 12 inches, except 10 to 20 inches expected above 4000 feet. Winds gusting as high as 45 mph. * WHERE...Mazama, Stevens Pass, Holden Village. * WHEN...Through 10 AM PST Sunday. * IMPACTS...Travel could be very difficult. Wet heavy snow and gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Snow rates of an inch an hour are expected across Stevens Pass through 3 AM. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
594 WWUS46 KOTX 031345 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 545 AM PST Sun Jan 3 2021 ...MORE SNOW ON MONDAY AFTER PANHANDLE SNOW WINDS DOWN TODAY... Lookout Pass will continue to see heavy snow through mid morning with snow dissipating through the late morning hours. There will be a break between weather systems this afternoon into this evening. Another weather system moves in tonight with temperatures expected to be colder at onset of precipitation. Valleys in north-central Washington are expected to see snow with heavy accumulations possible for the east slopes of the northern Cascades and Okanogan Highlands. WAZ042-032145- /O.CAN.KOTX.WW.Y.0001.000000T0000Z-210103T1800Z/ /O.NEW.KOTX.WS.A.0002.210104T0600Z-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 545 AM PST Sun Jan 3 2021 ...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH MONDAY EVENING... ...WINTER WEATHER ADVISORY IS CANCELLED... * WHAT...Heavy snow possible. Total snow accumulations of 6 to 10 inches possible in the valleys and 10 to 20 inches possible for the mountains. * WHERE...Mazama, Twisp, Winthrop, Stehekin, Conconully, Blewett Pass, Loup Loup Pass, Stevens Pass, Plain, and Holden Village. * WHEN...From this evening through Monday evening. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snow is expected to switch over to rain in the Wenatchee River Valley up to Leavenworth by Monday afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ IDZ004-032000- /O.CON.KOTX.WS.W.0001.000000T0000Z-210103T2000Z/ Central Panhandle Mountains- Including the following locations Lookout Pass 545 AM PST Sun Jan 3 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST TODAY ABOVE 4000 FEET... * WHAT...Heavy snow above 4000 feet. Additional snow accumulations of 2 to 6 inches. Winds gusting as high as 40 mph. * WHERE...Lookout Pass. * WHEN...Until noon PST today. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WAZ038-032145- /O.NEW.KOTX.WS.A.0002.210104T0800Z-210105T0300Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 545 AM PST Sun Jan 3 2021 ...WINTER STORM WATCH IN EFFECT FROM LATE TONIGHT THROUGH MONDAY EVENING... * WHAT...Heavy snow possible. Total snow accumulations of 5 to 10 inches possible. * WHERE...Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...From late tonight through Monday evening. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snow is expected to switch over to rain north along Highway 21 from Keller to Republic through the day on Monday. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
705 WWUS46 KOTX 031933 WSWOTX URGENT - WINTER WEATHER MESSAGE National Weather Service Spokane WA 1133 AM PST Sun Jan 3 2021 ...MORE HEAVY SNOW FOR THE MOUNTAINS...THE METHOW VALLEY...AND THE OKANOGAN HIGHLANDS MONDAY... IDZ004-032045- /O.CAN.KOTX.WS.W.0001.000000T0000Z-210103T2000Z/ Central Panhandle Mountains- 1133 AM PST Sun Jan 3 2021 ...WINTER STORM WARNING IS CANCELLED... Any additional snow accumulations for the mountains of the central Idaho Panhandle will be minimal this afternoon. More snow will arrive on Monday and continue into Monday night. $$ WAZ042-040000- /O.CON.KOTX.WS.A.0002.210104T0600Z-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 1133 AM PST Sun Jan 3 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM 10 PM PST THIS EVENING THROUGH MONDAY EVENING... * WHAT...Heavy snow possible. Total snow accumulations of 6 to 10 inches possible in the valleys and 10 to 20 inches possible for the mountains. * WHERE...Mazama, Twisp, Winthrop, Stehekin, Conconully, Blewett Pass, Loup Loup Pass, Stevens Pass, Plain, and Holden Village. * WHEN...From this evening through Monday evening. * IMPACTS...Motorists should plan for winter driving conditions Monday into Monday evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ WAZ038-040000- /O.CON.KOTX.WS.A.0002.210104T0800Z-210105T0300Z/ Okanogan Highlands- Including the following locations Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass 1133 AM PST Sun Jan 3 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH MONDAY EVENING... * WHAT...Heavy snow possible. Total snow accumulations of 5 to 10 inches possible. * WHERE...Republic, Wauconda, Chesaw Road, Highway 20 Wauconda Summit, Boulder Creek Road, and Sherman Pass. * WHEN...From late tonight through Monday evening. * IMPACTS...Motorists should plan for winter driving conditions Monday into Monday evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
Nearby
Winter Storm Warnings in Idaho, 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.