Montana Department of Transportation

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Accidents and Incidents Report

Winter Storm Warning/Watch/Advisory

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Note:  Be sure to pay close attention to the date and time of each warning.    
This document contains all warnings in the state so please read the
complete document.
 
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WWUS45 KBYZ 211533
WSWBYZ

URGENT - WINTER WEATHER MESSAGE
National Weather Service Billings MT
933 AM MDT Thu Sep 21 2017

MTZ068-221545-
/O.EXA.KBYZ.WS.W.0011.000000T0000Z-170923T1200Z/
Crazy Mountains-
933 AM MDT Thu Sep 21 2017

...WINTER STORM WARNING IN EFFECT UNTIL 6 AM MDT SATURDAY...

The National Weather Service in Billings has issued a Winter
Storm Warning for Heavy Snow...which is in effect until 6 AM MDT 
Saturday. 

* IMPACTS...Travel in the high country will be affected by periods
  of heavy snowfall. Hunters and recreationists should be prepared
  for dangerous winter conditions. 

* TIMING...Through Friday night. Heaviest snowfall is expected 
  late this afternoon through Friday morning.

* SNOW ACCUMULATION...10 to 15 inches, greatest on eastern slopes
  above 7000 feet.

Precautionary/preparedness actions...

A Winter Storm Warning means a significant amount of snow is
expected or occurring. This will make travel and back country
conditions very hazardous.

&&

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MTZ067-221545-
/O.CON.KBYZ.WS.W.0011.000000T0000Z-170923T1200Z/
Absaroka/Beartooth Mountains-
933 AM MDT Thu Sep 21 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM MDT
SATURDAY...

* IMPACTS...Travel in the high country will be affected by 
  periods of heavy snowfall. Hunters and recreationists should 
  be prepared for dangerous winter conditions. Travel across 
  Beartooth Pass could be interrupted for a prolonged period. 

* TIMING...Through Friday night. Heaviest snowfall is expected 
  late this afternoon through Friday morning.

* SNOW ACCUMULATION...10 to 20 inches, greatest above 8000 feet.

Precautionary/preparedness actions...

A Winter Storm Warning means a significant amount of snow is
expected or occurring. This will make travel and back country
conditions very hazardous.

&&

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http://weather.gov/billings


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WWUS45 KMSO 210933
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
333 AM MDT Thu Sep 21 2017

MTZ006-007-220945-
/O.NEW.KMSO.WW.Y.0027.170922T0300Z-170923T0600Z/
333 AM MDT Thu Sep 21 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO
MIDNIGHT MDT FRIDAY NIGHT ABOVE 5000 FEET...

* Impacts/Timing: Snow will develop this evening and continue into
  Friday evening, with accumulations possible down to 5000 feet. 
  Brief periods of moderate to heavy snow will be possible early 
  Friday morning. Expect roads to become slippery with changeable 
  conditions over short distances. In addition, areas of poor 
  visibility are expected due to the combination of falling snow 
  and breezy winds.

* Snow accumulations: Total snow accumulations of 3 to 5 inches.
  Snow amounts of 5 to 8 inches are expected in the high
  elevations above 6000 feet, including over MacDonald and
  Homestake Passes.

* Winds: Gusts as high as 30 mph will cause areas of low 
  visibility, especially on high mountain passes such as Homestake
  and MacDonald.

* Locations impacted include: Highway 93 Sula to Lost Trail Pass,
  Butte, Georgetown Lake, Anaconda, Philipsburg, Homestake Pass, 
  MacDonald Pass, and backcountry roads above 5000 feet.

--------------------------------

IDZ009-010-220945-
/O.NEW.KMSO.WW.Y.0027.170922T0000Z-170923T0600Z/
333 AM MDT Thu Sep 21 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
MIDNIGHT MDT FRIDAY NIGHT ABOVE 5500 FEET...

* Impacts/Timing: Snow will develop this evening and continue into
  Friday evening, with accumulations possible down to 5500 feet.
  Expect roads to become slippery over higher elevation passes and
  backcountry roads. In addition, areas of poor visibility are 
  expected due to the combination of falling snow and breezy 
  winds.

* Snow accumulations: Total snow accumulations of 3 to 5 inches.
  Snow amounts of 5 to 8 inches are expected in the high
  elevations above 7000 feet, including over Gilmore Summit, and
  Lost Trail, Bannock and Lemhi Passes.

* Winds: Gusts as high as 30 mph will cause areas of low
  visibility, especially on high mountain passes such as Gilmore 
  Summit.

* Locations impacted include: Bannock Pass, Highway 28 Tendoy to
  Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi
  Pass, and backcountry roads above 5500 feet.

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WWUS45 KTFX 210914
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
314 AM MDT Thu Sep 21 2017

...Snow to return across higher elevations tonight into Friday 
morning...

.A large upper level disturbance will return snow across southern
Montana this evening...spreading northward through the overnight 
hours. Snow may then continue through Friday morning before 
lifting into the higher elevations. Generally 1 to 4 inches of 
snow are possible above 4000 feet...with 4 to 8 inches above 6000 
feet...and some locally higher amounts across the higher mountain 
peaks.

MTZ012-014-050-052-053-212100-
/O.NEW.KTFX.WW.Y.0036.170922T0000Z-170923T0600Z/
Cascade-Central and Southern Lewis and Clark-Judith Basin-
Jefferson-Broadwater-
314 AM MDT Thu Sep 21 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
MIDNIGHT MDT FRIDAY NIGHT FOR ELEVATIONS ABOVE 4500 FEET...

The National Weather Service in Great Falls has issued a Winter
Weather Advisory For elevations above 4500 feet for periods of
moderate snow, which is in effect from 6 PM this evening to 
midnight MDT Friday night.

* Locations: Locations above 4500 feet including MacDonald,
  Homestake, Kings Hill, and other mountain passes.

* Timing: Rain to start this evening, changing to snow around
  midnight, then continuing as snow through Friday morning. Areas
  of snow and rain then will continue through the remainder of
  Friday.

* Accumulations: Snow accumulation of 1 to 4 inches with up to 6
  inches possible above 5000 feet.

* Winds: North 10 to 20 mph with gusts up to 30 mph.

* Visibilities: Below a mile at times in the heavier snow and 
  wind.

* Snow Level: 6000 feet lowering to 4500 feet. 

* Impacts: The heavy snow will make mountain roads and passes
  difficult to travel and may produce widespread power outages due
  to the weight of the snow on tree limbs and power lines. Those
  with outdoor interests should plan for the return of winter
  conditions. 

* Web Page: To see a graphical representation of this hazard, 
  please visit our web page and mouse over the Current Hazards 
  menu, then select Detailed Hazards.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means that periods of snow
will cause primarily travel difficulties. Be prepared for snow
covered roads and limited visibilities, and use caution while
driving.

For specific road and travel conditions in Montana, dial 5 1 1 .

&&

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MTZ008-015-054-055-212100-
/O.NEW.KTFX.WW.Y.0036.170922T0000Z-170923T0600Z/
Beaverhead-Madison-Meagher-Gallatin-
314 AM MDT Thu Sep 21 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
MIDNIGHT MDT FRIDAY NIGHT FOR ELEVATIONS ABOVE 5500 FEET...

The National Weather Service in Great Falls has issued a Winter
Weather Advisory For elevations above 5500 feet for periods of
moderate to heavy snow, which is in effect from 6 PM this evening
to midnight MDT Friday night.

* Locations: Locations above 4500 feet including Kings Hill,
  Bozeman, Monida, Raynolds, and other mountain passes

* Timing: Rain and higher elevation snow will develop today, with
  widespread snow down to 5500 feet expected by late this evening
  through Friday morning. Snow above 6000 feet is then expected
  for the remainder of Friday.

* Accumulations: Snow accumulation of 2 to 6 inches, with 6 to 10
  inches possible above 6000 feet.

* Winds: Northeast 10 to 20 mph with gusts up to 30 mph.

* Visibilities: Below a mile at times in the heavier snow and 
  wind.

* Snow Level: 6500 feet lowering to 5500 feet. 

* Impacts: The heavy snow will make mountain roads and passes
  difficult to travel and may produce widespread power outages due
  to the weight of the snow on tree limbs and power lines. Those
  withoutdoor interests should plan for the return of winter
  conditions.

* Web Page: To see a graphical representation of this hazard, 
  please visit our web page and mouse over the Current Hazards 
  menu, then select Detailed Hazards.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means that periods of snow
will cause primarily travel difficulties. Be prepared for snow
covered roads and limited visibilities, and use caution while
driving.

For specific road and travel conditions in Montana, dial 5 1 1 .

&&

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