Alert archive / Montana / Winter Storm Warnings in 2022
Winter Storm Warning 7, NWS Missoula, MT
NWS Missoula, MT issued this winter storm warning at Apr 10, 2022, 2:44 PM MDT for 6 counties in Montana; Clearwater County, Idaho County, Lemhi County, Idaho. It took effect at Apr 11, 2022, 3:00 PM MDT. It was in force for 21 hr. 22 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
- Apr 10, 2022, 2:44 PM MDT (20:44 UTC)
- In effect from
- Apr 11, 2022, 3:00 PM MDT
- Expired
- Apr 12, 2022, 12:00 PM MDT
- In force
- 21 hr
- Issued by
- NWS Missoula, MT
Counties Clearwater County, ID, Idaho County, ID, Lemhi County, ID, Deer Lodge County, MT, Granite County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 94 km from the middle of the area, began a volume at 20:45 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 |
|---|---|---|---|
| Apr 11, 10:47 PM MDT | HEAVY SNOW 4.5 | 2 Sw Newcomb, MT | 17F WITH HEAVY SNOW ONGOING. |
| Apr 12, 4:00 AM MDT | HEAVY SNOW 26 | 8 S Janney, MT | SNOWFALL ESTIMATE FROM BASIN CREEK SNOTEL - BSCM8. |
| Apr 12, 7:22 AM MDT | SNOW 1.5 | 4 Wnw West Valley, MT | |
| Apr 12, 7:28 AM MDT | SNOW 1 | 3 E Florence, MT | OVERNIGHT SNOW. |
| Apr 12, 7:41 AM MDT | HEAVY SNOW 12 | 2 Sw Newcomb, MT | |
| Apr 12, 8:33 AM MDT | SNOW 2.5 | 4 Nne Lolo, MT | OVERNIGHT SNOW. |
| Apr 12, 8:36 AM MDT | SNOW 4.5 | 1 Ene Elk River, ID | ESTIMATE. |
| Apr 12, 8:45 AM MDT | SNOW 2 | 3 S Greenough, MT | OVERNIGHT SNOW. |
| Apr 12, 8:47 AM MDT | SNOW 6 | 3 Nw Elk City, ID | LOST POWER FOR SEVERAL HOURS OVERNIGHT 4/11-4/12. |
| Apr 12, 8:59 AM MDT | SNOW 1 | Riggins, ID | OVERNIGHT SNOW. |
| Apr 12, 9:03 AM MDT | SNOW 2 | 3 Nnw Drummond, MT | |
| Apr 12, 9:16 AM MDT | HEAVY SNOW 6 | 1 S Copperville, ID | BLOWING AND DRIFITNG, WHITEOUT CONDITIONS FOR AN HOUR ON 4/11. |
| Apr 12, 9:19 AM MDT | HEAVY SNOW 10 | 4 Sse Conner, MT | OVERNIGHT SNOW. |
| Apr 12, 9:19 AM MDT | HEAVY SNOW 24 | 2 Se Janney, MT | |
| Apr 12, 9:25 AM MDT | SNOW 4 | 2 Ene Clinton, MT | OVERNIGHT SNOW. |
| Apr 12, 9:25 AM MDT | HEAVY SNOW 6 | 1 Sw Grangeville, ID | VARYING AMOUNTS THROUGHOUT THE YARD, 6 WAS AVERAGE. |
| Apr 12, 9:58 AM MDT | SNOW 4 | 2 Nw Kooskia, ID | OVERNIGHT SNOW. |
| Apr 12, 10:14 AM MDT | HEAVY SNOW 8 | 3 Ssw Philipsburg, MT | |
| Apr 12, 10:22 AM MDT | SNOW 0.5 | 4 W Hamilton, MT | OVERNIGHT SNOW. |
| Apr 12, 10:23 AM MDT | SNOW 0.5 | 6 E Kooskia, ID | OVERNIGHT SNOW. 0.42 LIQUID WATER EQUIVALENT. |
| Apr 12, 10:40 AM MDT | HEAVY SNOW 7 | 12 N Mackay Bar, ID | OVERNIGHT SNOW. DIXIE, ID. |
| Apr 12, 11:55 AM MDT | HEAVY SNOW 5 | Darby, MT |
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 12:00Z, 8.7 hours before the alert went out and 252 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
- 1416 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
031 WWUS45 KMSO 102044 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 244 PM MDT Sun Apr 10 2022 MTZ006-112045- /O.UPG.KMSO.WS.A.0005.220412T0000Z-220412T1800Z/ /O.NEW.KMSO.WS.W.0007.220411T2200Z-220412T1800Z/ Bitterroot/Sapphire Mountains- 244 PM MDT Sun Apr 10 2022 ...WINTER STORM WARNING IN EFFECT FROM 4 PM MONDAY TO NOON MDT TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations of 8 to 14 inches Sula to Lost Trail Pass, and 4 to 6 inches at Lolo Pass. Northerly winds gusting as high as 35 mph will produce blowing and drifting snow at times. * WHERE...Bitterroot/Sapphire Mountains. * WHEN...From 4 PM Monday to noon MDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. The cold wind chills as low as zero could result in hypothermia if precautions are not taken. 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. && $$ MTZ007-112045- /O.UPG.KMSO.WS.A.0005.220412T0000Z-220412T1800Z/ /O.NEW.KMSO.WS.W.0007.220411T2200Z-220412T1800Z/ Butte/Blackfoot Region- 244 PM MDT Sun Apr 10 2022 ...WINTER STORM WARNING IN EFFECT FROM 4 PM MONDAY TO NOON MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 11 to 15 inches along the Divide including the Butte area, 6 to 9 inches Georgetown Lake to Garrison Junction and 2 to 5 inches elsewhere. North to east winds generally gusting as high as 40 mph. * WIND...Northeast 25 to 35 mph with gusts to 50 mph between Drummond and Deer Lodge on Interstate 90, and also between Helmville and MacDonald Pass. Combined with the snow could create blizzard conditions Monday night in these areas. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From 4 PM Monday to noon MDT Tuesday. * IMPACTS...Travel could be very difficult to impossible. Patchy blowing snow could significantly reduce visibility. Local cold wind chills as low as 15 below zero could result in hypothermia if precautions are not taken. High winds in northern Powell County could cause tree damage or power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ006-112045- /O.NEW.KMSO.WS.W.0007.220411T2100Z-220412T1800Z/ Southern Clearwater Mountains- 144 PM PDT Sun Apr 10 2022 ...WINTER STORM WARNING IN EFFECT FROM 2 PM MONDAY TO 11 AM PDT TUESDAY... * WHAT...Heavy snow expected. Melting snow will lead to a refreeze on surfaces after nightfall. Total snow accumulations of 2 to 5 inches along Highway 12, and 6 to 10 inches in the higher elevations including Dixie and Lolo Pass. Northeast winds 10 to 25 mph will develop at night. * WHERE...Dixie, Elk City, and Highway 12 Lowell to Lolo Pass. * WHEN...From 2 PM Monday to 11 AM PDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. 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. && $$ IDZ005-112045- /O.NEW.KMSO.WW.Y.0024.220411T2100Z-220412T0600Z/ Northern Clearwater Mountains- 144 PM PDT Sun Apr 10 2022 ...WINTER WEATHER ADVISORY IN EFFECT FROM 2 PM TO 11 PM PDT MONDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches. Gusty northeast winds between 15 and 25 mph with gusts to 35 mph will develop late evening. * WHERE...Elk River, Highway 11 Pierce to Headquarters, and Pierce. * WHEN...From 2 PM to 11 PM PDT Monday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ007-112045- /O.EXB.KMSO.WS.A.0005.220411T2100Z-220412T1800Z/ Orofino/Grangeville Region- 144 PM PDT Sun Apr 10 2022 ...WINTER STORM WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... * WHAT...Heavy snow possible. Snow will refreeze on surfaces after nightfall and steep roadways could become treacherous. Total snow accumulations of 2 to 6 inches possible. * WIND...Southwest winds 10 to 25 mph in the evening, becoming north to east 12 to 18 mph in the Camas Prairie except 15 to 25 mph with gusts to 35 mph on Greer Grade. This could produce patchy blowing and drifting snow and low visibility. * WHERE...Camas Prairie, Grangeville and vicinity, and Greer Grade. * WHEN...From Monday afternoon through Tuesday morning. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ IDZ009-010-112045- /O.CON.KMSO.WS.A.0005.220412T0000Z-220412T1800Z/ Western Lemhi County-Eastern Lemhi County- 244 PM MDT Sun Apr 10 2022 ...WINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY MORNING... * WHAT...Heavy snow possible. Total snow accumulations of 8 to 14 inches at Lost Trail Pass, 6 to 9 inches Williams Creek Summit and other passes along the Divide, and 2 to 5 inches in the lower valleys are possible. * WHERE...Shoup, Bannock Pass, Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and Salmon. * WHEN...From Monday evening through Tuesday morning. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ IDZ008-112045- /O.CON.KMSO.WS.A.0005.220412T0000Z-220412T1800Z/ Lower Hells Canyon/Salmon River Region- 144 PM PDT Sun Apr 10 2022 ...WINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... * WHAT...Heavy snow possible. Snow will refreeze on surfaces after nightfall and steep roadways like Whitebird Grade could become treacherous. Total snow accumulations of 2 to 5 inches along Highway 95 between Riggins and Whitebird, 4 to 6 inches possible at Whitebird and 6 to 8 inches in the higher populated benches. * WHERE...Lower Hells Canyon/Salmon River Region. * WHEN...From Monday afternoon through Tuesday morning. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
5 follow-up statements
765 WWUS45 KMSO 102220 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 420 PM MDT Sun Apr 10 2022 IDZ006-112230- /O.CON.KMSO.WS.W.0007.220411T2100Z-220412T1800Z/ Southern Clearwater Mountains- 320 PM PDT Sun Apr 10 2022 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 2 PM MONDAY TO 11 AM PDT TUESDAY... * WHAT...Heavy snow expected. Melting snow will lead to a refreeze on surfaces after nightfall. Total snow accumulations of 2 to 5 inches along Highway 12, and 6 to 10 inches in the higher elevations including Dixie and Lolo Pass. Northeast winds 10 to 25 mph will develop at night. * WHERE...Dixie, Elk City, and Highway 12 Lowell to Lolo Pass. * WHEN...From 2 PM Monday to 11 AM PDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ006-112230- /O.CON.KMSO.WS.W.0007.220411T2200Z-220412T1800Z/ Bitterroot/Sapphire Mountains- 420 PM MDT Sun Apr 10 2022 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 4 PM MONDAY TO NOON MDT TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations of 8 to 14 inches Sula to Lost Trail Pass, and 4 to 6 inches at Lolo Pass. Northerly winds gusting as high as 35 mph will produce blowing and drifting snow at times. * WHERE...Bitterroot/Sapphire Mountains. * WHEN...From 4 PM Monday to noon MDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. The cold wind chills as low as zero could result in hypothermia if precautions are not taken. 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. && $$ MTZ007-112230- /O.CON.KMSO.WS.W.0007.220411T2200Z-220412T1800Z/ Butte/Blackfoot Region- 420 PM MDT Sun Apr 10 2022 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 4 PM MONDAY TO NOON MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 11 to 15 inches along the Divide including the Butte area, 6 to 9 inches Georgetown Lake to Garrison Junction and 2 to 5 inches elsewhere. North to east winds generally gusting as high as 40 mph. * WIND...Northeast 25 to 35 mph with gusts to 50 mph between Drummond and Deer Lodge on Interstate 90, and also between Helmville and MacDonald Pass. Combined with the snow could create blizzard conditions Monday night in these areas. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From 4 PM Monday to noon MDT Tuesday. * IMPACTS...Travel could be very difficult to impossible. Patchy blowing snow could significantly reduce visibility. Local cold wind chills as low as 15 below zero could result in hypothermia if precautions are not taken. High winds in northern Powell County could cause tree damage or power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ043-112230- /O.EXB.KMSO.WW.Y.0024.220412T0200Z-220412T1500Z/ Potomac/Seeley Lake Region- 420 PM MDT Sun Apr 10 2022 ...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM MONDAY TO 9 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of up to two inches, with winds gusting as high as 45 mph along highway 200 and in the Seeley Lake region. Along I-90 from Bonner to Bearmouth, up to 4 inches is expected, along with wind gusts as high as 50 mph in isolated areas. Blowing snow will greatly reduce visibility along the interstate. * WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...From 8 PM Monday to 9 AM MDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. 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. && $$ IDZ005-112230- /O.CON.KMSO.WW.Y.0024.220411T2100Z-220412T0600Z/ Northern Clearwater Mountains- 320 PM PDT Sun Apr 10 2022 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 PM TO 11 PM PDT MONDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches. Gusty northeast winds between 15 and 25 mph with gusts to 35 mph will develop late evening. * WHERE...Elk River, Highway 11 Pierce to Headquarters, and Pierce. * WHEN...From 2 PM to 11 PM PDT Monday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ009-010-112230- /O.CON.KMSO.WS.A.0005.220412T0000Z-220412T1800Z/ Western Lemhi County-Eastern Lemhi County- 420 PM MDT Sun Apr 10 2022 ...WINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY MORNING... * WHAT...Heavy snow possible. Total snow accumulations of 8 to 14 inches at Lost Trail Pass, 6 to 9 inches Williams Creek Summit and other passes along the Divide, and 2 to 5 inches in the lower valleys are possible. * WHERE...Shoup, Bannock Pass, Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and Salmon. * WHEN...From Monday evening through Tuesday morning. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ IDZ008-112230- /O.CON.KMSO.WS.A.0005.220412T0000Z-220412T1800Z/ Lower Hells Canyon/Salmon River Region- 320 PM PDT Sun Apr 10 2022 ...WINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... * WHAT...Heavy snow possible. Snow will refreeze on surfaces after nightfall and steep roadways like Whitebird Grade could become treacherous. Total snow accumulations of 2 to 5 inches along Highway 95 between Riggins and Whitebird, 4 to 6 inches possible at Whitebird and 6 to 8 inches in the higher populated benches. * WHERE...Lower Hells Canyon/Salmon River Region. * WHEN...From Monday afternoon through Tuesday morning. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ IDZ007-112230- /O.CON.KMSO.WS.A.0005.220411T2100Z-220412T1800Z/ Orofino/Grangeville Region- 320 PM PDT Sun Apr 10 2022 ...WINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... * WHAT...Heavy snow possible. Snow will refreeze on surfaces after nightfall and steep roadways could become treacherous. Total snow accumulations of 2 to 6 inches possible. * WIND...Southwest winds 10 to 25 mph in the evening, becoming north to east 12 to 18 mph in the Camas Prairie except 15 to 25 mph with gusts to 35 mph on Greer Grade. This could produce patchy blowing and drifting snow and low visibility. * WHERE...Camas Prairie, Grangeville and vicinity, and Greer Grade. * WHEN...From Monday afternoon through Tuesday morning. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
401 WWUS45 KMSO 110739 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 139 AM MDT Mon Apr 11 2022 IDZ009-010-120745- /O.UPG.KMSO.WS.A.0005.220412T0000Z-220412T1800Z/ /O.EXB.KMSO.WS.W.0007.220412T0000Z-220412T1800Z/ Western Lemhi County-Eastern Lemhi County- 139 AM MDT Mon Apr 11 2022 ...WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON MDT TUESDAY... * WHAT...Heavy snow expected. Melting snow will lead to a refreeze on surfaces after nightfall. Total snow accumulations of 3 to 7 inches, with 7 to 14 inches along US 93 from Gibbonsville to Lost Trail Pass. * WHERE...Shoup, Bannock Pass, Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and Salmon. * WHEN...From 6 PM this evening to noon MDT Tuesday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ007-120745- /O.UPG.KMSO.WS.A.0005.220411T2100Z-220412T1800Z/ /O.EXA.KMSO.WS.W.0007.220411T2100Z-220412T1800Z/ Orofino/Grangeville Region- 1239 AM PDT Mon Apr 11 2022 ...WINTER STORM WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 11 AM PDT TUESDAY... * WHAT...Heavy snow expected. Snow will refreeze on surfaces after nightfall and steep roadways will become treacherous. Total snow accumulations of 3 to 6 inches. * WIND...Southwest winds 10 to 25 mph in the evening, becoming north to east 12 to 18 mph in the Camas Prairie except 15 to 25 mph with gusts to 35 mph on Greer Grade. This could produce patchy blowing and drifting snow and low visibility. * WHERE...Camas Prairie, Grangeville and vicinity, and Greer Grade. * WHEN...From 2 PM this afternoon to 11 AM PDT Tuesday. * IMPACTS...Travel could be very difficult. 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. && $$ IDZ008-120745- /O.UPG.KMSO.WS.A.0005.220412T0000Z-220412T1800Z/ /O.EXA.KMSO.WS.W.0007.220411T2100Z-220412T1800Z/ Lower Hells Canyon/Salmon River Region- 1239 AM PDT Mon Apr 11 2022 ...WINTER STORM WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 11 AM PDT TUESDAY... * WHAT...Heavy snow expected. Snow will refreeze on surfaces after nightfall and steep roadways like Whitebird Grade will become treacherous. Total snow accumulations of 2 to 5 inches along Highway 95 between Riggins and Whitebird, 4 to 7 inches at Whitebird Hill, and 6 to 8 inches in the higher populated benches. * WHERE...Lower Hells Canyon/Salmon River Region. * WHEN...From 2 PM this afternoon to 11 AM PDT Tuesday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ006-120745- /O.EXT.KMSO.WS.W.0007.220411T2100Z-220412T1800Z/ Bitterroot/Sapphire Mountains- 139 AM MDT Mon Apr 11 2022 ...WINTER STORM WARNING NOW IN EFFECT FROM 3 PM THIS AFTERNOON TO NOON MDT TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations of 8 to 14 inches Sula to Lost Trail Pass and 4 to 7 inches at Lolo Pass. Northerly winds gusting as high as 35 mph will produce blowing and drifting snow at times. * WHERE...Bitterroot/Sapphire Mountains. * WHEN...From 3 PM this afternoon to noon MDT Tuesday. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility. The cold wind chills as low as 15 below zero could result in hypothermia if precautions are not taken. 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. && $$ IDZ006-120745- /O.CON.KMSO.WS.W.0007.220411T2100Z-220412T1800Z/ Southern Clearwater Mountains- 1239 AM PDT Mon Apr 11 2022 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 11 AM PDT TUESDAY... * WHAT...Heavy snow expected. Melting snow will lead to a refreeze on surfaces after nightfall. Total snow accumulations of 2 to 5 inches along Highway 12 and 4 to 8 inches in the higher elevations, including Dixie and Lolo Pass. Northeast winds 15 to 30 mph will develop at night. * WHERE...Dixie, Elk City, and Highway 12 Lowell to Lolo Pass. * WHEN...From 2 PM this afternoon to 11 AM PDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-120745- /O.CON.KMSO.WS.W.0007.220411T2200Z-220412T1800Z/ Butte/Blackfoot Region- 139 AM MDT Mon Apr 11 2022 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 4 PM THIS AFTERNOON TO NOON MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 10 to 15 inches along the Divide including the Butte area, 6 to 10 inches Georgetown Lake to Garrison Junction and 2 to 5 inches elsewhere. * WIND...Northeast 30 to 40 mph with gusts to 60 mph between Drummond and Deer Lodge on Interstate 90, and also between Helmville and MacDonald Pass. Blizzard conditions are possible Monday night in these areas. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From 4 PM this afternoon to noon MDT Tuesday. * IMPACTS...Travel could be very difficult to impossible. Widespread blowing snow could significantly reduce visibility. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. 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. && $$ MTZ003-111500- /O.NEW.KMSO.WW.Y.0025.220411T0739Z-220411T1500Z/ Flathead/Mission Valleys- 139 AM MDT Mon Apr 11 2022 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING... * WHAT...Snow. Total snow accumulations of 2 to 5 inches. * WHERE...Flathead Lake and the Flathead Valley. * WHEN...Until 9 AM MDT this morning. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ005-120745- /O.EXB.KMSO.WW.Y.0024.220411T2100Z-220412T1500Z/ Missoula/Bitterroot Valleys- 139 AM MDT Mon Apr 11 2022 ...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 9 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of around one inch in Missoula, 1 to 3 inches Lolo to Victor, and 4 to 8 inches Hamilton to Conner. * WIND...Northeast winds 25 to 35 mph with gusts up to 55 mph expected in the Missoula Valley. Northeast wind 35 to 45 mph with gusts to 60 mph in the Rattlesnake area. North winds 25 to 35 mph in the Bitterroot Valley Monday night into Tuesday morning. * WHERE...Missoula/Bitterroot Valleys. * WHEN...From 3 PM this afternoon to 9 AM MDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. 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. && $$ MTZ043-120745- /O.EXT.KMSO.WW.Y.0024.220412T0000Z-220412T1500Z/ Potomac/Seeley Lake Region- 139 AM MDT Mon Apr 11 2022 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 6 PM THIS EVENING TO 9 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of up to two inches, with winds gusting as high as 45 mph along highway 200 and in the Seeley Lake region. Along I-90 from Bonner to Bearmouth, up to 4 inches is expected, along with wind gusts as high as 50 mph in isolated areas. Blowing snow will greatly reduce visibility along the interstate. * WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...From 6 PM this evening to 9 AM MDT Tuesday. * IMPACTS...Travel could be affected. Areas of blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ005-120600- /O.CON.KMSO.WW.Y.0024.220411T2100Z-220412T0600Z/ Northern Clearwater Mountains- 1239 AM PDT Mon Apr 11 2022 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 11 PM PDT THIS EVENING... * WHAT...Snow expected. Snow expected. Total snow accumulations of 2 to 5 inches. Gusty northeast winds between 15 and 25 mph with gusts to 35 mph will develop late evening. * WHERE...Elk River, Highway 11 Pierce to Headquarters, and Pierce. * WHEN...From 2 PM this afternoon to 11 PM PDT this evening. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. 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. && $$
560 WWUS45 KMSO 120453 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 1053 PM MDT Mon Apr 11 2022 IDZ009-010-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Western Lemhi County-Eastern Lemhi County- 1053 PM MDT Mon Apr 11 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TUESDAY... * WHAT...Heavy snow. Total snow accumulations of 4 to 7 inches, with 9 to 14 inches along US 93 from Gibbonsville to Lost Trail Pass. * WHERE...Shoup, Bannock Pass, Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and Salmon. * WHEN...Until noon MDT Tuesday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ007-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Orofino/Grangeville Region- 953 PM PDT Mon Apr 11 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM PDT TUESDAY... * WHAT...Heavy snow. Snow and ice on steep roadways will make for treacherous conditions. Total snow accumulations 1 to 3 inches from Orofino to Kamiah and 3 to 6 inches Camas Prairie and Grangeville. * WIND...Southwest winds 10 to 25 mph in the evening, becoming north to east 12 to 18 mph in the Camas Prairie except 15 to 25 mph with gusts to 35 mph on Greer Grade. This could produce patchy blowing and drifting snow and low visibility. * WHERE...Camas Prairie, Grangeville and vicinity, and Greer Grade. * WHEN...Until 11 AM PDT Tuesday. * IMPACTS...Travel could be very difficult. 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. && $$ IDZ008-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Lower Hells Canyon/Salmon River Region- 953 PM PDT Mon Apr 11 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM PDT TUESDAY... * WHAT...Heavy snow. Snow and ice on steep roadways like Whitebird Grade will cause treacherous conditions. Total snow accumulations of 2 to 5 inches along Highway 95 between Riggins and Whitebird, 4 to 7 inches at Whitebird Hill, and 6 to 8 inches in the higher populated benches. * WHERE...Lower Hells Canyon/Salmon River Region. * WHEN...Until 11 AM PDT Tuesday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ006-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Southern Clearwater Mountains- 953 PM PDT Mon Apr 11 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM PDT TUESDAY... * WHAT...Heavy snow. Total snow accumulations of 2 to 5 inches along Highway 12 and 4 to 8 inches in the higher elevations, including Dixie and Lolo Pass. Northeast winds 15 to 30 mph will develop at night. * WHERE...Dixie, Elk City, and Highway 12 Lowell to Lolo Pass. * WHEN...Until 11 AM PDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. 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. && $$ MTZ006-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Bitterroot/Sapphire Mountains- 1053 PM MDT Mon Apr 11 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TUESDAY... * WHAT...Heavy snow. Total snow accumulations of 8 to 14 inches Sula to Lost Trail Pass and 4 to 7 inches at Lolo Pass. Northerly winds gusting as high as 35 mph will produce blowing and drifting snow at times. * WHERE...Bitterroot/Sapphire Mountains. * WHEN...Until noon MDT Tuesday. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility. The cold wind chills as low as 15 below zero could result in hypothermia if precautions are not taken. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Butte/Blackfoot Region- 1053 PM MDT Mon Apr 11 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TUESDAY... * WHAT...Heavy snow and blowing snow. Total snow accumulations of 10 to 15 inches along the Divide including the Butte area, 6 to 10 inches Georgetown Lake to Garrison Junction and 2 to 5 inches elsewhere. * WIND...Northeast 30 to 40 mph with gusts to 50 mph between Drummond and Deer Lodge on Interstate 90, and also between Helmville and MacDonald Pass. Blizzard conditions are possible Monday night in these areas. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...Until noon MDT Tuesday. * IMPACTS...Travel could be very difficult to impossible. Widespread blowing snow could significantly reduce visibility. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. 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. && $$ IDZ005-121500- /O.EXT.KMSO.WW.Y.0024.000000T0000Z-220412T1500Z/ Northern Clearwater Mountains- 953 PM PDT Mon Apr 11 2022 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 8 AM PDT TUESDAY... * WHAT...Snow. Total snow accumulations of 2 to 5 inches. Gusty northeast winds between 15 and 25 mph with gusts to 35 mph will develop late evening. * WHERE...Elk River, Highway 11 Pierce to Headquarters, and Pierce. * WHEN...Until 8 AM PDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ005-121500- /O.CON.KMSO.WW.Y.0024.000000T0000Z-220412T1500Z/ Missoula/Bitterroot Valleys- 1053 PM MDT Mon Apr 11 2022 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT TUESDAY... * WHAT...Snow. Total snow accumulations of around one inch in Missoula, 1 to 3 inches Lolo to Victor, and 4 to 8 inches Hamilton to Conner. * WIND...Northeast winds 20 to 30 mph with gusts up to 40 mph expected in the Missoula Valley. Northeast wind 25 to 35 mph with gusts to 45 mph in the Rattlesnake area. North winds 25 to 35 mph in the Bitterroot Valley Monday night into Tuesday morning. * WHERE...Missoula/Bitterroot Valleys. * WHEN...Until 9 AM MDT Tuesday. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. 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. && $$ MTZ043-121500- /O.CON.KMSO.WW.Y.0024.000000T0000Z-220412T1500Z/ Potomac/Seeley Lake Region- 1053 PM MDT Mon Apr 11 2022 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT TUESDAY... * WHAT...Snow. Total snow accumulations of up to two inches, with winds gusting as high as 45 mph along highway 200 and in the Seeley Lake region. Along I-90 from Bonner to Bearmouth, up to 4 inches is expected, along with wind gusts as high as 50 mph in isolated areas. Blowing snow will greatly reduce visibility along the interstate. * WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...Until 9 AM MDT Tuesday. * IMPACTS...Travel could be affected. Areas of blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
050 WWUS45 KMSO 121454 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 854 AM MDT Tue Apr 12 2022 MTZ005-121600- /O.EXP.KMSO.WW.Y.0024.000000T0000Z-220412T1500Z/ Missoula/Bitterroot Valleys- 854 AM MDT Tue Apr 12 2022 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 AM MDT THIS MORNING... $$ IDZ005-121600- /O.EXP.KMSO.WW.Y.0024.000000T0000Z-220412T1500Z/ Northern Clearwater Mountains- 754 AM PDT Tue Apr 12 2022 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 8 AM PDT THIS MORNING... $$ MTZ043-121600- /O.EXP.KMSO.WW.Y.0024.000000T0000Z-220412T1500Z/ Potomac/Seeley Lake Region- 854 AM MDT Tue Apr 12 2022 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 AM MDT THIS MORNING... $$ IDZ009-010-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Western Lemhi County-Eastern Lemhi County- 854 AM MDT Tue Apr 12 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY... * WHAT...Heavy snow. Additional snow accumulations of up to one inch. * WHERE...Shoup, Bannock Pass, Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and Salmon. * WHEN...Until noon MDT today. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ007-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Orofino/Grangeville Region- 754 AM PDT Tue Apr 12 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING... * WHAT...Heavy snow. Additional snow accumulations of up to one inch. * WIND...Southwest winds 10 to 25 mph in the evening, becoming north to east 12 to 18 mph in the Camas Prairie except 15 to 25 mph with gusts to 35 mph on Greer Grade. This could produce patchy blowing and drifting snow and low visibility. * WHERE...Camas Prairie, Grangeville and vicinity, and Greer Grade. * WHEN...Until 11 AM PDT this morning. * IMPACTS...Travel could be affected. 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. && $$ IDZ008-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Lower Hells Canyon/Salmon River Region- 754 AM PDT Tue Apr 12 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING... * WHAT...Heavy snow. Additional snow accumulations of up to one inch. * WHERE...Lower Hells Canyon/Salmon River Region. * WHEN...Until 11 AM PDT this morning. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ006-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Southern Clearwater Mountains- 754 AM PDT Tue Apr 12 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING... * WHAT...Heavy snow. Additional snow accumulations of up to one inch. * WHERE...Dixie, Elk City, and Highway 12 Lowell to Lolo Pass. * WHEN...Until 11 AM PDT this morning. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. 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. && $$ MTZ006-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Bitterroot/Sapphire Mountains- 854 AM MDT Tue Apr 12 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY... * WHAT...Heavy snow. Additional snow accumulations of up to one inch. * WHERE...Bitterroot/Sapphire Mountains. * WHEN...Until noon MDT today. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. The cold wind chills as low as 15 below zero could result in hypothermia if precautions are not taken. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-121800- /O.CON.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Butte/Blackfoot Region- 854 AM MDT Tue Apr 12 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY... * WHAT...Heavy snow. Additional snow accumulations of up to one inch. * WIND...Northeast 30 to 40 mph with gusts to 50 mph between Drummond and Deer Lodge on Interstate 90, and also between Helmville and MacDonald Pass. Blizzard conditions are possible Monday night in these areas. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...Until noon MDT today. * IMPACTS...Travel could be affected. Patchy blowing snow could significantly reduce visibility. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. 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. && $$
372 WWUS45 KMSO 121745 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 1145 AM MDT Tue Apr 12 2022 IDZ009-010-121845- /O.EXP.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Western Lemhi County-Eastern Lemhi County- 1145 AM MDT Tue Apr 12 2022 ...WINTER STORM WARNING WILL EXPIRE AT NOON MDT TODAY... $$ IDZ007-121845- /O.EXP.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Orofino/Grangeville Region- 1045 AM PDT Tue Apr 12 2022 ...WINTER STORM WARNING WILL EXPIRE AT 11 AM PDT THIS MORNING... $$ IDZ008-121845- /O.EXP.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Lower Hells Canyon/Salmon River Region- 1045 AM PDT Tue Apr 12 2022 ...WINTER STORM WARNING WILL EXPIRE AT 11 AM PDT THIS MORNING... $$ IDZ006-121845- /O.EXP.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Southern Clearwater Mountains- 1045 AM PDT Tue Apr 12 2022 ...WINTER STORM WARNING WILL EXPIRE AT 11 AM PDT THIS MORNING... $$ MTZ006-121845- /O.EXP.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Bitterroot/Sapphire Mountains- 1145 AM MDT Tue Apr 12 2022 ...WINTER STORM WARNING WILL EXPIRE AT NOON MDT TODAY... $$ MTZ007-121845- /O.EXP.KMSO.WS.W.0007.000000T0000Z-220412T1800Z/ Butte/Blackfoot Region- 1145 AM MDT Tue Apr 12 2022 ...WINTER STORM WARNING WILL EXPIRE AT NOON MDT TODAY... $$
What forecasters said that day
The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Missoula, MT wrote its last area forecast discussion before this winter storm warning went out at Apr 10, 3:15 AM MDT, 11 hours 29 minutes earlier.
Area forecast discussion, Apr 10, 3:15 AM MDT, 11 hours 29 minutes before
Area Forecast Discussion...corrected
National Weather Service Missoula MT
315 AM MDT Sun Apr 10 2022
...Unusually cold wintry pattern continues through mid-week...
...Heavy snow and damaging wind risk increasing...
.DISCUSSION...Snow shower activity will increase across
Clearwater and Idaho counties this morning as a shortwave trough
axis moves overhead. Winter Weather Advisories remain in effect as
1 to 4 inches of snow is expected through Noon. Another distinct
area of snow shower activity will develop across the Glacier Park
region and Flathead Valley this afternoon and evening as a weak
backdoor cold front pushes through. A 30-40% probability exists
for 2 inches or more of snow across US-93 corridor from the
Flathead Valley to Eureka and for the West Glacier region. The
aforementioned shortwave trough will push across western Montana
this afternoon. Convective snow and/or graupel showers will once
again become widespread.
A closed low will deepen as it moves onshore along the Oregon
coast Monday morning. Northeast winds will increase across
northwest and west-central Montana Monday as the low begins to
track eastward into central Oregon. Model ensemble guidance
continues to advertise a variety of snow, wind, and cold impacts
which will be outlined below.
*Heavy Snow
A closed surface low and mid-level circulation center
will track across southern Lemhi County into southwest Montana
Monday night into Tuesday morning. A band of moderate to heavy
snow will develop on the north-northwest periphery of these
aforementioned features. Snow amounts have trended higher across
the Lower Hells Canyon/Salmon River area and Lemhi County Idaho.
Therefore, winter storm watches have been issued. To put this
potential spring snow event into perspective, the 1st and 2nd
highest 1-day snow totals for Riggins, ID is 6.4 inches (April
10, 1903) and 0.4 inches (April 13, 1972). The current forecast
has 2 inches of snow for Riggins. Furthermore, Salmon, ID will
likely see a top-3 April snow event as 3-6 inches is currently in
the forecast. Snow amounts have also trended higher along the
I-90 corridor from Deer Lodge to Butte. The heaviest amounts will
focus across Silver Bow County, where easterly upslope winds
along the divide will enhance snowfall.
*Damaging Wind
There is growing concern and evidence for a
damaging wind event across northwest Montana Monday into Monday
night. The surface low tracking eastward across Oregon will draw
a record cold (for mid-April) Canadian air mass over the divide.
The pressureM gradient will tighten rapidly Monday night as a surface
high strengthens across north-central Montana and the surface low
moves into Lemhi County. The pressure gradient along with deep
east-northeast winds give us high confidence for wind gusts of at
least 40 mph or greater to occur, especially along western slopes
of mountain ranges from the Canadian border down to the Mission
Mountains. As mentioned in the previous discussion, GFS MOS
continues to highlight sustained winds of 50 knots Monday night
for Kalispell, signaling concern for a damaging wind event.
Further, vertical cross-sections this morning depict a classic
mountain wave wind storm set-up along west slopes of the Mission,
Swan, and Whitefish Ranges. One area of particular concern is
along the east shore of Flathead Lake, where NBM4.1 is
highlighting a 35% chance for wind gusts up to 55 mph. Given the
spread and abrupt trend within guidance in the last 24-hours, we
elected to hold off on high wind watches for now. These trends
will be monitored closely in the next 12 hours. Consider
preparing for damaging winds if you live in northwest Montana.
Are you prepared for power outages? Is your car susceptible to
falling trees?
*Record Cold
Record low maximum temperatures are likely Tuesday
and Wednesday across the Northern Rockies. Forecast highs have
trended lower compared to 24-hours ago, with temperatures
struggling to reach the freezing mark (Tuesday) across west-
central and northwest Montana. Highs will only manage the 20s
along the divide. Those with agricultural interests and cold
sensitive plants/crops should begin to prepare for low
temperatures in 20s across lower elevations of Idaho, teens
across western Montana valleys, and single digits along the
divide. Below-zero temperatures are possible across the I-90
corridor from Garrison Junction to Butte Wednesday and Thursday
morning. NBM probabilities suggest a 15-25% chance of this
outcome.
Thursday into next weekend, the active weather pattern may
continue. Model ensemble guidance is trending towards another
closed low moving across the Pacific Northwest into the Northern
Rockies. /Lukinbeal
&&
.AVIATION...Another round of convective snow and graupel showers
is expected this afternoon and evening. An area of organized snow
shower activity will develop across Clearwater and Idaho counties
this morning, where 1 to 4 inches of snow is expected. Snow shower
activity will organize across northwest Montana near the Glacier
Park region through this evening as an upper level wave stalls
overhead and a backdoor Canadian front moves over the divide.
There is a 35% chance for 2 inches or more of snow at KGPI by
11/0600z. Winds will trend weaker today, with most terminals
seeing gusts below 15 knots. /Lukinbeal
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT... Winter Storm Watch from Monday evening through Tuesday morning
Bitterroot/Sapphire Mountains...Butte/Blackfoot Region.
ID...Winter Weather Advisory until noon PDT today Lower Hells
Canyon/Salmon River Region.
Winter Storm Watch from Monday afternoon through Tuesday morning
Lower Hells Canyon/Salmon River Region.
Winter Weather Advisory until noon PDT today Southern Clearwater
Mountains.
Winter Storm Watch from Monday evening through Tuesday morning
Eastern Lemhi County...Western Lemhi County.
Winter Weather Advisory until noon PDT today Orofino/Grangeville
Region.
&&The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 2:26 PM MDT | High Wind Warning | MSO | Flathead, Lake, Lincoln, Mineral, Missoula, Ravalli and 1 more | 43 hr |
| Apr 10, 2:26 PM MDT | Wind Advisory | MSO | Flathead, Lake, Sanders | 13 hr |
| Apr 10, 2:44 PM MDT | Winter Weather Advisory | MSO | Granite, Lake, Missoula, Powell, Ravalli | 42 hr |
| Apr 9, 9:40 PM MDT | Winter Weather Advisory | MSO | Clearwater, Idaho | 15 hr |
Nearby
Winter Storm Warnings in Montana, 2022Winter Storm Warnings in Idaho, 2022Every winter storm warning in 2022
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.