Alert archive / Montana / Winter Storm Warnings in 2017
Winter Storm Warning 13, NWS Missoula, MT
NWS Missoula, MT issued this winter storm warning at Oct 1, 2017, 2:25 PM MDT for 6 counties in Montana. It took effect at Oct 2, 2017, 6:00 AM MDT. It was in force for 24 hr. 6 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
- Oct 1, 2017, 2:25 PM MDT (20:25 UTC)
- In effect from
- Oct 2, 2017, 6:00 AM MDT
- Expired
- Oct 3, 2017, 6:00 AM MDT
- In force
- 24 hr
- Issued by
- NWS Missoula, MT
Counties Deer Lodge County, MT, Flathead County, MT, Granite County, MT, Lake County, MT, Powell County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 51 km from the middle of the area, began a volume at 20:26 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 |
|---|---|---|---|
| Oct 2, 9:36 PM MDT | SNOW 2 | Anaconda, MT | STILL SNOWING. JUST SLUSHY ACCUMULATIONS ON SIDEWALKS, BUT TEMPERATURES ARE STILL DROPPING. |
| Oct 3, 1:32 AM MDT | SNOW 4 | Anaconda, MT | |
| Oct 3, 5:51 AM MDT | SNOW 6 | Anaconda, MT | UPDATE: AN ADDITIONAL 2 INCHES HAS BEEN MEASURED FROM EARLIER REPORTS, FOR A TOTAL OF 6. |
| Oct 3, 6:00 AM MDT | SNOW 3 | Skalkaho Pass, MT | SKALKAHO SUMMIT SNOTEL AT 7250 FT. |
| Oct 3, 6:00 AM MDT | SNOW 5 | 8 S Janney, MT | BASIN CREEK SNOTEL AT 7180 FT. |
| Oct 3, 6:00 AM MDT | SNOW 7 | 6 Ssw Georgetown, MT | REPORTED AT PETERSON MEADOWS SNOTEL AT 7200 FT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 8.4 hours before the alert went out and 220 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
- 1536 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
784 WWUS45 KMSO 012025 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 225 PM MDT Sun Oct 1 2017 MTZ002-022115- /O.UPG.KMSO.WS.A.0008.171002T1200Z-171003T1200Z/ /O.NEW.KMSO.WS.W.0013.171002T1200Z-171003T1200Z/ West Glacier Region- 225 PM MDT Sun Oct 1 2017 ...WINTER STORM WARNING IN EFFECT FROM 6 AM MONDAY TO 6 AM MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Plan on difficult travel conditions. Below 4000 feet total snow accumulations of 1 to 3 inches are expected. Above 4000 feet 3 to 5 inches, and localized amounts up to 15 inches across the highest terrain. Travelers over Marias Pass should plan for low visibility due to snow and blowing snow with 8 to 12 inches total accumulation by Tuesday morning. * WHERE...Bad Rock Canyon, Essex, Highway 83 Bigfork to Swan Lake, Marias Pass, and Polebridge. * WHEN...From Monday morning through late Monday night. * ADDITIONAL DETAILS...Winds gusting as high as 30 mph will cause areas of blowing and drifting snow, resulting in very poor visibility at times. Periods of near whiteout conditions are possible over Marias Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are expected. 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. && $$ MTZ007-043-022115- /O.NEW.KMSO.WW.Y.0029.171002T1500Z-171003T1200Z/ Butte/Blackfoot Region-Potomac/Seeley Lake Region- 225 PM MDT Sun Oct 1 2017 ...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM MONDAY TO 6 AM MDT TUESDAY... * WHAT...Snow is expected. Plan on slippery road conditions, especially when traveling over MacDonald and Homestake Passes along with other mountain roads. Total snow accumulations of 2 to 4 inches, with localized amounts up to 7 inches, are expected. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, MacDonald Pass, Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...9 AM Monday to 6 AM Tuesday. * ADDITIONAL DETAILS...Be prepared for reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ006-MTZ006-020100- /O.CON.KMSO.WW.Y.0028.000000T0000Z-171002T0100Z/ Southern Clearwater Mountains-Bitterroot/Sapphire Mountains- 225 PM MDT Sun Oct 1 2017 /125 PM PDT Sun Oct 1 2017/ ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM MDT /6 PM PDT/ THIS EVENING ABOVE 5000 FEET... * WHAT...A wintry mixture of wet snow, graupel and sleet will continue into this evening. Plan on slippery road conditions. Additional wet snow accumulations of up to one inch are expected. * WHERE...Dixie, Elk City, Highway 12 Lowell to Lolo Pass, Highway 93 Sula to Lost Trail Pass, and Lolo Pass. * WHEN...Until 7 PM today. * ADDITIONAL DETAILS...Be prepared for reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for wet snow means periods of wet snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
4 follow-up statements
140 WWUS45 KMSO 020038 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 638 PM MDT Sun Oct 1 2017 IDZ006-MTZ006-020145- /O.EXP.KMSO.WW.Y.0028.000000T0000Z-171002T0100Z/ Southern Clearwater Mountains-Bitterroot/Sapphire Mountains- 638 PM MDT Sun Oct 1 2017 /538 PM PDT Sun Oct 1 2017/ ...WINTER WEATHER ADVISORY WILL EXPIRE AT 7 PM MDT /6 PM PDT/ THIS EVENING ABOVE 5000 FEET... Snow showers above 5000 feet will slowly diminish in coverage through the evening. $$ MTZ002-030045- /O.CON.KMSO.WS.W.0013.171002T1200Z-171003T1200Z/ West Glacier Region- 638 PM MDT Sun Oct 1 2017 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 AM MONDAY TO 6 AM MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Plan on difficult travel conditions. Below 4000 feet total snow accumulations of 1 to 3 inches are expected. Above 4000 feet 3 to 5 inches, and localized amounts up to 15 inches across the highest terrain. Travelers over Marias Pass should plan for low visibility due to snow and blowing snow with 8 to 12 inches total accumulation by Tuesday morning. * WHERE...Bad Rock Canyon, Essex, Highway 83 Bigfork to Swan Lake, Marias Pass, and Polebridge. * WHEN...6 AM Monday to 6 AM Tuesday. * ADDITIONAL DETAILS...Be prepared for significant reductions in visibility at times. Winds gusting as high as 30 mph will cause areas of blowing and drifting snow, resulting in very poor visibility at times. Periods of near whiteout conditions are possible over Marias Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are expected. 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. && $$ MTZ007-043-030045- /O.CON.KMSO.WW.Y.0029.171002T1500Z-171003T1200Z/ Butte/Blackfoot Region-Potomac/Seeley Lake Region- 638 PM MDT Sun Oct 1 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 AM MONDAY TO 6 AM MDT TUESDAY... * WHAT...Snow is expected. Plan on slippery road conditions, especially when traveling over MacDonald and Homestake Passes along with other mountain roads. Total snow accumulations of 2 to 4 inches, with localized amounts up to 7 inches, are expected. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, MacDonald Pass, Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...9 AM Monday to 6 AM Tuesday. * ADDITIONAL DETAILS...Be prepared for reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
934 WWUS45 KMSO 021842 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 1242 PM MDT Mon Oct 2 2017 MTZ007-031200- /O.UPG.KMSO.WW.Y.0029.000000T0000Z-171003T1200Z/ /O.EXA.KMSO.WS.W.0013.000000T0000Z-171003T1200Z/ Butte/Blackfoot Region- 1242 PM MDT Mon Oct 2 2017 ...WINTER STORM WARNING IN EFFECT UNTIL 6 AM MDT TUESDAY... * WHAT...Heavy snow and blowing snow occurring over MacDonald Pass and terrain above 5000 feet. Plan on difficult travel conditions. Additional snow accumulations of 1 to 3 inches, with localized amounts up to 6 inches, are expected. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...Until 6 AM Tuesday. * ADDITIONAL DETAILS...Be prepared for significant reductions in visibility at times, especially over MacDonald Pass, due to blowing and drifting snow. Winds gusting up to 35 mph likely. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are occurring. 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. $$ MTZ002-031200- /O.CON.KMSO.WS.W.0013.000000T0000Z-171003T1200Z/ West Glacier Region- 1242 PM MDT Mon Oct 2 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT TUESDAY... * WHAT...Heavy snow and blowing snow occurring. Plan on difficult travel conditions. Additional snow accumulations of 3 to 5 inches, with localized amounts up to 14 inches, are expected. * WHERE...Bad Rock Canyon, Essex, Highway 83 Bigfork to Swan Lake, Marias Pass, and Polebridge. * WHEN...Until 6 AM Tuesday. * ADDITIONAL DETAILS...Winds gusting as high as 35 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow and blowing snow means severe winter weather conditions are occurring. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. $$ MTZ043-031200- /O.CON.KMSO.WW.Y.0029.000000T0000Z-171003T1200Z/ Potomac/Seeley Lake Region- 1242 PM MDT Mon Oct 2 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT TUESDAY... * WHAT...Snow occurring. Plan on slippery road conditions. Additional snow accumulations of 1 to 3 inches, with localized amounts up to 6 inches, are expected. * WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...Until 6 AM Tuesday. * ADDITIONAL DETAILS...Be prepared for reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. $$
978 WWUS45 KMSO 030954 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 354 AM MDT Tue Oct 3 2017 MTZ007-031500- /O.CAN.KMSO.WS.W.0013.000000T0000Z-171003T1200Z/ /O.EXB.KMSO.WW.Y.0029.000000T0000Z-171003T1500Z/ Butte/Blackfoot Region- 354 AM MDT Tue Oct 3 2017 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Snow is still occurring, however not at the intensity we have experienced the past several hours. Still plan on slippery road conditions to continue through the early morning hours. Additional snow accumulations of 1 to 2 inches are expected. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...Until 9 AM today. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. $$ MTZ002-031200- /O.CON.KMSO.WS.W.0013.000000T0000Z-171003T1200Z/ West Glacier Region- 354 AM MDT Tue Oct 3 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT EARLY THIS MORNING... * WHAT...Light snow is still occurring, with slick conditions still expected through the early morning hours, particularly for Marias Pass. * WHERE...Bad Rock Canyon, Essex, Highway 83 Bigfork to Swan Lake, Marias Pass, and Polebridge. * WHEN...Until 6 AM today. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are occurring. 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. $$ MTZ043-031200- /O.CON.KMSO.WW.Y.0029.000000T0000Z-171003T1200Z/ Potomac/Seeley Lake Region- 354 AM MDT Tue Oct 3 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT EARLY THIS MORNING... * WHAT...Light snow is still occurring, with slick conditions still expected through the early morning hours. * WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...Until 6 AM today. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. $$
090 WWUS45 KMSO 031154 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 554 AM MDT Tue Oct 3 2017 MTZ002-031300- /O.EXP.KMSO.WS.W.0013.000000T0000Z-171003T1200Z/ West Glacier Region- 554 AM MDT Tue Oct 3 2017 ...WINTER STORM WARNING WILL EXPIRE AT 6 AM MDT EARLY THIS MORNING... $$ MTZ043-031300- /O.EXP.KMSO.WW.Y.0029.000000T0000Z-171003T1200Z/ Potomac/Seeley Lake Region- 554 AM MDT Tue Oct 3 2017 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 6 AM MDT EARLY THIS MORNING... $$ MTZ007-031500- /O.CON.KMSO.WW.Y.0029.000000T0000Z-171003T1500Z/ Butte/Blackfoot Region- 554 AM MDT Tue Oct 3 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... * WHAT...Snow is still occurring, however not at the intensity we have experienced the past several hours. Still plan on slippery road conditions to continue through the early morning hours. Additional snow accumulations of 1 to 2 inches are expected. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...Until 9 AM today. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. 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 |
|---|---|---|---|---|
| Oct 1, 1:14 PM MDT | Special Weather Statement | MSO | Lake | 31 min |
| Oct 1, 2:25 PM MDT | Winter Weather Advisory | MSO | Deer Lodge, Granite, Lake, Missoula, Powell, Silver Bow | 43 hr |
| Oct 1, 2:44 PM MDT | Lake Wind Advisory | MSO | Flathead, Lake, Sanders | 34 hr |
Nearby
Winter Storm Warnings in Montana, 2017Every winter storm warning in 2017
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.