Alert archive / Montana / Wind Chill Advisories in 2021
Wind Chill Advisory 4, NWS Missoula, MT
NWS Missoula, MT issued this wind chill advisory at Dec 25, 2021, 11:00 AM MST for Flathead County, Lake County, Montana. It took effect at Dec 25, 2021, 5:00 PM MST. It was in force for 48 min.
The area
The counties it named.
The facts
- Issued
- Dec 25, 2021, 11:00 AM MST (18:00 UTC)
- In effect from
- Dec 25, 2021, 5:00 PM MST
- Expired
- Dec 25, 2021, 5:48 PM MST
- In force
- 48 min
- Issued by
- NWS Missoula, MT
Counties Flathead County, MT, Lake County, MT
The radar
The Missoula radar (KMSX), 104 km from the middle of the area, began a volume at 18:03 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 12:00Z, 6.0 hours before the alert went out and 177 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
- 789 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
678 WWUS45 KMSO 251800 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 1100 AM MST Sat Dec 25 2021 MTZ002-261800- /O.EXP.KMSO.WS.W.0014.000000T0000Z-211225T1800Z/ /O.NEW.KMSO.WW.Y.0078.211225T1800Z-211226T0000Z/ /O.NEW.KMSO.WC.Y.0004.211226T0000Z-211226T1800Z/ West Glacier Region- 1100 AM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WIND CHILL ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 11 AM MST SUNDAY... ...WINTER STORM WARNING HAS EXPIRED... * WHAT...For the Winter Weather Advisory, snow. Additional snow accumulations of 1 to 3 inches. For the Wind Chill Advisory, very cold wind chills expected. Wind chills as low as 30 below zero. * WHERE...Bad Rock Canyon, Essex, Highway 83 Bigfork to Swan Lake, Marias Pass, and Polebridge. * WHEN...For the Winter Weather Advisory, until 5 PM MST this afternoon. For the Wind Chill Advisory, from 5 PM this afternoon to 11 AM MST Sunday. * IMPACTS...Travel could be affected. The dangerously cold wind chills could cause frostbite on exposed skin in as little as 10 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ001-261800- /O.EXP.KMSO.WW.Y.0077.000000T0000Z-211225T1800Z/ /O.CON.KMSO.WS.A.0011.211226T1200Z-211227T0600Z/ Kootenai/Cabinet Region- 1100 AM MST Sat Dec 25 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY EVENING... ...WINTER WEATHER ADVISORY HAS EXPIRED... * WHAT...Heavy snow possible. Total snow accumulations of 2 to 4 inches possible. * WHERE...Highway 2 Kalispell to Libby, Highway 37 Eureka to Libby, Highway 56 Bull Lake Road, and Highway 93 Eureka to Whitefish. * WHEN...For the Winter Weather Advisory, until 11 AM MST this morning. For the Winter Storm Watch, from late tonight through Sunday evening. * IMPACTS...Travel could be very difficult. The cold wind chills as low as 30 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ MTZ004-251900- /O.EXP.KMSO.WW.Y.0076.000000T0000Z-211225T1800Z/ Lower Clark Fork Region- 1100 AM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY HAS EXPIRED... $$ MTZ003-261800- /O.CON.KMSO.WS.A.0011.211226T1200Z-211227T0600Z/ Flathead/Mission Valleys- 1100 AM MST Sat Dec 25 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY EVENING... * WHAT...Heavy snow possible. Total snow accumulations of 1 to 4 inches possible, along with blowing snow, and a sudden drop in temperature to single digits. * WHERE...Flathead Lake, Flathead Valley, Mission Valley, and Polson. * WHEN...From late tonight through Sunday evening. * IMPACTS...Travel could be affected. The cold wind chills as low as 15 below zero could result in hypothermia if precautions are not taken. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ MTZ007-261800- /O.CON.KMSO.WS.A.0011.211226T1200Z-211227T0600Z/ Butte/Blackfoot Region- 1100 AM MST Sat Dec 25 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY EVENING... * WHAT...Heavy snow possible. Total snow accumulations of 1 to 4 inches possible, along with blowing snow, and a sudden drop in temperature below 0 degrees. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From late tonight through Sunday evening. * IMPACTS...Travel could be affected. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
2 follow-up statements
613 WWUS45 KMSO 251943 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 1243 PM MST Sat Dec 25 2021 MTZ001-261945- /O.UPG.KMSO.WS.A.0011.211226T1200Z-211227T0600Z/ /O.NEW.KMSO.WW.Y.0079.211226T1200Z-211227T0000Z/ Kootenai/Cabinet Region- 1243 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches. Wind chill as cold as 25 below zero. * WHERE...Highway 2 Kalispell to Libby, Highway 37 Eureka to Libby, Highway 56 Bull Lake Road, and Highway 93 Eureka to Whitefish, Yaak. * WHEN...From 5 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ003-261945- /O.UPG.KMSO.WS.A.0011.211226T1200Z-211227T0600Z/ /O.NEW.KMSO.WW.Y.0079.211226T1200Z-211227T0000Z/ Flathead/Mission Valleys- 1243 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of up to 3 inches. Wind chill as cold as 20 below zero. * WHERE...Flathead Lake, Flathead Valley, Mission Valley, and Polson. * WHEN...From 5 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. The cold wind chills as low as 10 below zero could result in hypothermia if precautions are not taken. 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. && $$ MTZ007-261945- /O.UPG.KMSO.WS.A.0011.211226T1200Z-211227T0600Z/ /O.NEW.KMSO.WW.Y.0079.211226T1200Z-211227T0000Z/ Butte/Blackfoot Region- 1243 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of up to 3 inches. Wind chill as cold as 10 below zero. * WHERE...Butte, Georgetown Lake, Ovando, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From 5 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. The cold wind chills as low as 10 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ004-261945- /O.NEW.KMSO.WW.Y.0079.211226T1200Z-211227T0000Z/ Lower Clark Fork Region- 1243 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 1 to 3 inches, with 3 to 5 inches for Lookout Pass. * WHERE...Evaro Hill, Highway 200 Thompson Falls to Plains, Highway 200 Trout Creek to Heron, and I-90 Lookout Pass to Haugan. * WHEN...From 5 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. 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. && $$ MTZ043-261945- /O.NEW.KMSO.WW.Y.0079.211226T1200Z-211227T0000Z/ Potomac/Seeley Lake Region- 1243 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 1 to 4 inches. Wind chill as cold as 5 below zero. * WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...From 5 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. The cold wind chills as low as 5 below zero could result in hypothermia if precautions are not taken. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ002-261800- /O.CON.KMSO.WW.Y.0078.000000T0000Z-211226T0000Z/ /O.CON.KMSO.WC.Y.0004.211226T0000Z-211226T1800Z/ West Glacier Region- 1243 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 11 AM MST SUNDAY... * WHAT...For the Winter Weather Advisory, snow. Additional snow accumulations of 1 to 3 inches. For the Wind Chill Advisory, very cold wind chills expected. Wind chills as low as 30 below zero. * WHERE...Bad Rock Canyon, Essex, Highway 83 Bigfork to Swan Lake, Marias Pass, and Polebridge. * WHEN...For the Winter Weather Advisory, until 5 PM MST this afternoon. For the Wind Chill Advisory, from 5 PM this afternoon to 11 AM MST Sunday. * IMPACTS...Travel could be affected. The dangerously cold wind chills could cause frostbite on exposed skin in as little as 10 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
384 WWUS45 KMSO 260048 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 548 PM MST Sat Dec 25 2021 MTZ002-270100- /O.UPG.KMSO.WC.Y.0004.000000T0000Z-211226T1800Z/ /O.NEW.KMSO.WC.W.0002.211226T0048Z-211227T1200Z/ West Glacier Region- 548 PM MST Sat Dec 25 2021 ...WIND CHILL WARNING IN EFFECT UNTIL 5 AM MST MONDAY... * WHAT...Dangerously cold wind chills. Wind chills as low as 46 below zero between West Glacier and Marias Pass. Wind chills as low as 35 below zero at Bad Rock Canyon. Periods of light to moderate snow expected through Sunday combined with wind gusts to 40 mph will create blowing and drifting snow at times. * WHERE...Bad Rock Canyon, Essex, and Marias Pass. * WHEN...Until 5 AM MST Monday. * IMPACTS...The dangerously cold wind chills could cause frostbite on exposed skin in as little as 10 minutes. Blowing snow will reduce visibility to less than one mile at times. * IMPACTS...The dangerously cold wind chills could cause frostbite on exposed skin in as little as 10 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outside activities if possible. When outside, make sure you wear appropriate clothing, a hat, and gloves. && $$ MTZ006-261800- /O.EXB.KMSO.WW.Y.0079.211226T0800Z-211226T1800Z/ Bitterroot/Sapphire Mountains- 548 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 11 AM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations between 1 and 2 inches. * WHERE...Bitterroot/Sapphire Mountains. * WHEN...From 1 AM to 11 AM MST Sunday. * IMPACTS...Travel could be affected. 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. && $$ IDZ005-006-261800- /O.EXB.KMSO.WW.Y.0079.211226T0800Z-211226T1800Z/ Northern Clearwater Mountains-Southern Clearwater Mountains- 448 PM PST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM PST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 1 to 3 inches. * WHERE...Elk River, Highway 11 Pierce to Headquarters, Pierce, Dixie, Elk City, and Highway 12 Lowell to Lolo Pass. * WHEN...From midnight tonight to 10 AM PST Sunday. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ009-010-261800- /O.EXB.KMSO.WW.Y.0079.211226T0300Z-211226T1800Z/ Western Lemhi County-Eastern Lemhi County- 548 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 11 AM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of up to two inches. * WHERE...Shoup, Bannock Pass, Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and Salmon. * WHEN...Until 11 AM MST Sunday. * IMPACTS...Travel could be affected. 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. && $$ MTZ001-270000- /O.EXT.KMSO.WW.Y.0079.211226T0900Z-211227T0000Z/ Kootenai/Cabinet Region- 548 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 2 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches. Increasing northeast winds between 12 and 18 mph with gusts to 28 mph on US-2 between Happy's Inn and Kila will create localized blowing and drifting snow with low visibility. Wind chill as cold as 25 below zero. * WHERE...Highway 2 Kalispell to Libby, Highway 37 Eureka to Libby, Highway 56 Bull Lake Road, and Highway 93 Eureka to Whitefish, Yaak. * WHEN...From 2 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ003-270000- /O.EXT.KMSO.WW.Y.0079.211226T1100Z-211227T0000Z/ Flathead/Mission Valleys- 548 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 4 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of up to 3 inches. Increasing north to east winds between 15 and 25 mph with gusts to 35 mph overnight. This could lead to localized blowing and drifting snow in the Flathead Valley, around Flathead Lake and on Highway 28 near Hot Springs. Wind chill as cold as 25 below zero. * WHERE...Flathead Lake, Flathead Valley, Mission Valley, and Polson. * WHEN...From 4 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. The cold wind chills as low as 25 below zero cause frostbite on exposed skin in as little as 30 minutes. 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. && $$ MTZ004-270000- /O.CON.KMSO.WW.Y.0079.211226T1200Z-211227T0000Z/ Lower Clark Fork Region- 548 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 1 to 3 inches, with 3 to 5 inches for Lookout Pass. * WHERE...Evaro Hill, Highway 200 Thompson Falls to Plains, Highway 200 Trout Creek to Heron, and I-90 Lookout Pass to Haugan. * WHEN...From 5 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-270000- /O.CON.KMSO.WW.Y.0079.211226T1200Z-211227T0000Z/ Butte/Blackfoot Region- 548 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of up to 3 inches. East winds between 15 and 30 mph will create localized blowing and drifting snow with low visibility along Highways 200 and 12. Wind chill as cold as 30 below zero in Helmville and MacDonald Pass, to 20 below zero elsewhere. * WHERE...Butte, Georgetown Lake, Ovando, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From 5 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. The cold wind chills as low as 30 below zero could cause frostbite on exposed skin in as little as 30 minutes. 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. && $$ MTZ043-270000- /O.CON.KMSO.WW.Y.0079.211226T1200Z-211227T0000Z/ Potomac/Seeley Lake Region- 548 PM MST Sat Dec 25 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 AM TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 1 to 4 inches. East winds between 10 and 20 mph with gusts to 30 mph along Highway 200 near and east of Clearwater Junction will create localized blowing and drifting snow and low visibility at times. Wind chill as cold as 15 below zero. * WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...From 5 AM to 5 PM MST Sunday. * IMPACTS...Travel could be affected. The cold wind chills as low as 15 below zero could result in hypothermia if precautions are not taken. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 24, 8:39 PM MST | Snow Squall Warning | MSO | Mineral | 81 min |
| Dec 25, 8:23 AM MST | Special Weather Statement | MSO | Missoula | 52 min |
| Dec 25, 11:00 AM MST | Winter Weather Advisory | MSO | Flathead, Lake | 6 hr |
| Dec 25, 12:43 PM MST | Winter Weather Advisory | MSO | Deer Lodge, Flathead, Granite, Lake, Lincoln, Mineral and 5 more | 28 hr |
Nearby
Wind Chill Advisories in Montana, 2021Every wind chill advisory 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.