Winter Storm Warning 11, NWS Missoula, MT

672 
WWUS45 KMSO 171026
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
426 AM MDT Wed May 17 2017

MTZ043-181030-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
426 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 3500 FEET FOR HIGHWAY 83 SEELEY LAKE TO CONDON AND
I-90 EAST MISSOULA TO BEARMOUTH...

* Impacts/Timing: Heavy, wet snow is still expected to develop
  across the area this morning. The period for the heaviest
  precipitation will be now through the afternoon today. Heavy 
  wet snow could damage trees that have recently leafed out. 

* The addition of slightly warmer air Wednesday afternoon may 
  cause the snow level to fluctuate. 

* Snow accumulations: Storm totals 3 to 6 inches of snow for 
  elevations above 4000 feet across the Seeley/Swan region. 1 to 3
  inches below 4000 feet. 

$$

IDZ006-MTZ006-172000-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170517T2000Z/
426 AM MDT Wed May 17 2017 /326 AM PDT Wed May 17 2017/

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MDT /1 PM
PDT/ THIS AFTERNOON ABOVE 4000 FEET...

* Impacts/Timing: Heavy, wet snow has now begun to fall and cover
  area roads. The period of the heaviest precipitation will be now
  through the afternoon today. The heavy wet snow will likely
  damage trees that have leafed out, and will also create slick 
  driving conditions. 

* Snow accumulations: Storm totals for 4000 to 5000 feet: 4 to 8 
  inches. Above 5000 feet (including Lolo & Lost Trail Pass): 8 to
  12 inches with the highest peaks in the Bitterroot Mountains 
  receiving up to 2 feet. 

* Locations impacted include: Dixie, Elk City, Highway 93 Sula 
  to Lost Trail Pass, and Lolo Pass

$$

IDZ009-010-180300-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T0300Z/
426 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING ABOVE 4000 FEET...

* Impacts/Timing: Heavy, wet snow has now begun to fall and cover
  area roads. The period of heaviest precipitation will be now
  through the afternoon today. The heavy wet snow could damage 
  trees that have leafed out, and will create slick driving 
  conditions. Snow levels are expected to rise above the Salmon 
  area by late morning and early afternoon.

* Snow accumulations: Storm totals for 4,000 to 5,000 feet: 1 to 
  4 inches. Above 5,000 feet: 4 to 10 inches including over 
  mountain passes with 12 to 16 inches possible on the highest 
  peaks of the Bitterroot and Lemhi Mountains. 

* Locations impacted include: Bannock Pass, Highway 28 Tendoy to 
  Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, and 
  Lemhi Pass

$$

MTZ002-181030-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
426 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 4000 FEET FOR MARIAS PASS...

* Impacts/Timing: Heavy, wet snow is still expected to develop
  across the area this morning. The heaviest precipitation is
  expected to begin by sunrise and continue into the afternoon 
  and evening today. Heavy wet snow could also damage trees that 
  have recently leafed out. 

* The addition of slightly warmer air Wednesday afternoon may 
  cause the snow level to fluctuate. 

* Snow accumulations: Storm totals of 6 to 8 inches, or more is 
  expected for elevations above 4000 feet in Glacier National Park
  and Marias Pass. 

$$

MTZ007-181030-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
426 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 5000 FEET...

* Impacts/Timing: Heavy, wet snow has now begun to fall and cover
  area roads. The period of heaviest precipitation will be now 
  through the evening today. The heavy wet snow will likely damage
  trees that have leafed out, and will create slick driving 
  conditions. 

* The addition of slightly warmer air this afternoon may cause 
  the snow level to fluctuate and result in periods of a rain/snow
  mix in Butte and Anaconda. 

* Snow accumulations: Storm totals for 5,000 to 6,000 feet: 2 to 5
  inches. 1 to 2 inches below 5000 feet. Above 6,000 feet: 6 to 12
  inches with up to 2 feet possible throughout the highest
  terrain.

* Locations impacted include: Butte, Georgetown Lake, Homestake 
  Pass, and MacDonald Pass

$$

MTZ003-005-171600-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170517T1600Z/
426 AM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM MDT THIS
MORNING...

* Impacts/Timing: A rain and snow mix has started to fall from the
  southern Mission Valley into the Missoula and Bitterroot Valleys.
  Precipitation is still expected to change to all snow by 
  sunrise, before changing back to rain later this morning. The 
  heavy wet snow could damage area trees, resulting in broken 
  branches and isolated power outages.

* Snow accumulations: Storm totals of a trace to 3
  inches...locally higher amounts are possible for the benches
  around 4000 feet.
  

$$

IDZ005-MTZ004-171800-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170517T1800Z/
426 AM MDT Wed May 17 2017 /326 AM PDT Wed May 17 2017/

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
/11 AM PDT/ TODAY...

* Impacts/Timing: Heavy, wet snow has now begun to fall and is
  expected to cover area roads by sunrise. The period of heaviest
  precipitation will be now through the afternoon today. The heavy
  wet snow could damage trees that have leafed out, and will 
  create periods of slick driving conditions. 

* Snow accumulations: Storm totals of 4 to 8 inches of snow for 
  elevations of 4000 feet and above. A trace to 3 inches on grassy
  areas below 4000 ft. 

$$

IDZ008-172000-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170517T2000Z/
326 AM PDT Wed May 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 PM PDT THIS
AFTERNOON ABOVE 4000 FEET FOR WHITE BIRD GRADE...

* Impacts/Timing: Periods of moderate to heavy snow will continue
  off and on for White Bird Hill this morning. A more continuous
  round of moderate snow will occur this afternoon. The heavy wet
  snow could damage trees that have leafed out, and will create
  periods of slick driving conditions. 

* Snow accumulations: 4 to 8 inches of snow for elevations of 
  4000 feet and above. A trace to 2 inches on grassy areas below 
  4000 ft. 

$$

494 
WWUS45 KMSO 171123
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
523 AM MDT Wed May 17 2017

MTZ005-171600-
/O.UPG.KMSO.WW.Y.0025.000000T0000Z-170517T1600Z/
/O.EXB.KMSO.WS.W.0011.000000T0000Z-170517T1600Z/
523 AM MDT Wed May 17 2017

...WINTER STORM WARNING IN EFFECT UNTIL 10 AM MDT THIS MORNING
FOR BITTERROOT VALLEY AND MISSOULA...

The Winter Weather Advisory has been upgraded. 

* Impacts/Timing: Snowfall rates of 1 inch per hour have been
  observed in the Missoula valley this morning...and this is
  expected to continue for the next couple hours. The heavy wet
  snow accumulating on fully leafed trees could result in tree
  damage and potentially some trees and limbs breaking. Isolated
  power outages may also occur. Little accumulation is expected on
  area roads in valley bottoms, but scattered slush on the benches
  could lead to slick spots.

* Snow accumulations: Storm totals of a 1 to 3 inches...locally 
  higher amounts are possible for the benches around 4000 feet.

$$

MTZ043-181130-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
523 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 3500 FEET FOR HIGHWAY 83 SEELEY LAKE TO CONDON AND
I-90 EAST MISSOULA TO BEARMOUTH...

* Impacts/Timing: Heavy, wet snow is still expected to develop 
  across the area this morning. The period for the heaviest 
  precipitation will be now through the afternoon today. Heavy 
  wet snow could damage trees that have recently leafed out. 

* The addition of slightly warmer air Wednesday afternoon may 
  cause the snow level to fluctuate. 

* Snow accumulations: Storm totals 3 to 6 inches of snow for 
  elevations above 4000 feet across the Seeley/Swan region. 1 to 
  3 inches below 4000 feet. 

$$

IDZ006-MTZ006-172000-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170517T2000Z/
523 AM MDT Wed May 17 2017 /423 AM PDT Wed May 17 2017/

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MDT /1 PM
PDT/ THIS AFTERNOON ABOVE 4000 FEET...

* Impacts/Timing: Heavy, wet snow has now begun to fall and 
  cover area roads. The period of the heaviest precipitation 
  will be now through the afternoon today. The heavy wet snow 
  will likely damage trees that have leafed out, and will also 
  create slick driving conditions. 

* Snow accumulations: Storm totals for 4000 to 5000 feet: 4 to 8 
  inches. Above 5000 feet (including Lolo & Lost Trail Pass): 8 
  to 12 inches with the highest peaks in the Bitterroot 
  Mountains receiving up to 2 feet. 

* Locations impacted include: Dixie, Elk City, Highway 93 Sula 
  to Lost Trail Pass, and Lolo Pass

$$

IDZ009-010-180300-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T0300Z/
523 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING ABOVE 4000 FEET...

* Impacts/Timing: Heavy, wet snow has now begun to fall and 
  cover area roads. The period of heaviest precipitation will be 
  now through the afternoon today. The heavy wet snow could 
  damage trees that have leafed out, and will create slick 
  driving conditions. Snow levels are expected to rise above the 
  Salmon area by late morning and early afternoon. 

* Snow accumulations: Storm totals for 4,000 to 5,000 feet: 1 to 
  4 inches. Above 5,000 feet: 4 to 10 inches including over 
  mountain passes with 12 to 16 inches possible on the highest 
  peaks of the Bitterroot and Lemhi Mountains. 

* Locations impacted include: Bannock Pass, Highway 28 Tendoy to 
  Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, and 
  Lemhi Pass

$$

MTZ002-181130-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
523 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 4000 FEET FOR MARIAS PASS...

* Impacts/Timing: Heavy, wet snow is still expected to develop 
  across the area this morning. The heaviest precipitation is 
  expected to begin by sunrise and continue into the afternoon 
  and evening today. Heavy wet snow could also damage trees that 
  have recently leafed out. 

* The addition of slightly warmer air Wednesday afternoon may 
  cause the snow level to fluctuate. 

* Snow accumulations: Storm totals of 6 to 8 inches, or more is 
  expected for elevations above 4000 feet in Glacier National 
  Park and Marias Pass. 

$$

MTZ007-181130-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
523 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 5000 FEET...

* Impacts/Timing: Heavy, wet snow has now begun to fall and 
  cover area roads. The period of heaviest precipitation will be 
  now through the evening today. The heavy wet snow will likely 
  damage trees that have leafed out, and will create slick 
  driving conditions. 

* The addition of slightly warmer air this afternoon may cause 
  the snow level to fluctuate and result in periods of a 
  rain/snow mix in Butte and Anaconda. 

* Snow accumulations: Storm totals for 5,000 to 6,000 feet: 2 to 
  5 inches. 1 to 2 inches below 5000 feet. Above 6,000 feet: 6 
  to 12 inches with up to 2 feet possible throughout the highest 
  terrain. 

* Locations impacted include: Butte, Georgetown Lake, Homestake 
  Pass, and MacDonald Pass

$$

MTZ003-171600-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170517T1600Z/
523 AM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM MDT THIS
MORNING...

* Impacts/Timing: A rain and snow mix has started to fall from 
  the southern Mission Valley into the Missoula and Bitterroot 
  Valleys. Precipitation is still expected to change to all snow 
  by sunrise, before changing back to rain later this morning. 
  The heavy wet snow could damage area trees, resulting in 
  broken branches and isolated power outages. 

* Snow accumulations: Storm totals of a trace to 3 inches... 
  locally higher amounts are possible for the benches around 
  4000 feet. 

$$

IDZ005-MTZ004-171800-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170517T1800Z/
523 AM MDT Wed May 17 2017 /423 AM PDT Wed May 17 2017/

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
/11 AM PDT/ TODAY...

* Impacts/Timing: Heavy, wet snow has now begun to fall and is 
  expected to cover area roads by sunrise. The period of 
  heaviest precipitation will be now through the afternoon 
  today. The heavy wet snow could damage trees that have leafed 
  out, and will create periods of slick driving conditions. 

* Snow accumulations: Storm totals of 4 to 8 inches of snow for 
  elevations of 4000 feet and above. A trace to 3 inches on 
  grassy areas below 4000 ft. 

$$

IDZ008-172000-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170517T2000Z/
423 AM PDT Wed May 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 PM PDT THIS
AFTERNOON ABOVE 4000 FEET FOR WHITE BIRD GRADE...

* Impacts/Timing: Periods of moderate to heavy snow will 
  continue off and on for White Bird Hill this morning. A more 
  continuous round of moderate snow will occur this afternoon. 
  The heavy wet snow could damage trees that have leafed out, 
  and will create periods of slick driving conditions. 

* Snow accumulations: 4 to 8 inches of snow for elevations of 
  4000 feet and above. A trace to 2 inches on grassy areas below 
  4000 ft. 

$$

446 
WWUS45 KMSO 171439
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
839 AM MDT Wed May 17 2017

MTZ002-180600-
/O.CAN.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
/O.EXB.KMSO.WW.Y.0025.000000T0000Z-170518T0600Z/
839 AM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT MDT TONIGHT
ABOVE 4500 FEET and mainly for Marias Pass...
...WINTER STORM WARNING IS CANCELLED...

The National Weather Service in Missoula has cancelled the Winter
Storm Warning. 

* Impacts/Timing: Periods of light snow will occur through this
  afternoon, but mainly along the Continental Divide and above
  4500 feet. For areas that have relatively open access to the
  public, this mainly includes Marias Pass. Brisk northeast winds
  will cause areas of blowing and drifting snow over the higher 
  terrain and passes with reduced visbilities. 

* Snow accumulations: 2 to 3 inches of snow is likely over Marias
  Pass with local heavier amounts along the Continental Divide
  higher terrain. Otherwise, little or no snow can be expected 
  farther west and in the valley areas. 

$$

MTZ043-171545-
/O.CAN.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
839 AM MDT Wed May 17 2017

...WINTER STORM WARNING IS CANCELLED...

The National Weather Service in Missoula has cancelled the Winter
Storm Warning. 

Periods of mixed rain and snow will occur into Wednesday evening.
Local heavy snow can be expected along the Continental Divide 
higher terrain...otherwise little or no snow impacts are expected
in valley areas. 

$$

MTZ003-171545-
/O.CAN.KMSO.WW.Y.0025.000000T0000Z-170517T1600Z/
839 AM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY IS CANCELLED...

The National Weather Service in Missoula has cancelled the Winter
Weather Advisory. 

A mix of light rain and snow showers can be expected in the
extreme southern Mission Valley to Arlee through about mid
morning. Otherwise, only scattered light rain showers can be
expected the remainder of the day. 

$$

IDZ008-171545-
/O.CAN.KMSO.WW.Y.0025.000000T0000Z-170517T2000Z/
739 AM PDT Wed May 17 2017

...WINTER WEATHER ADVISORY IS CANCELLED...

The National Weather Service in Missoula has cancelled the Winter
Weather Advisory. 

Periods of light rain and snow will continue into the afternoon.
However, further snow impacts to main travel routes are no longer
expected. 

$$

MTZ005-171600-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170517T1600Z/
839 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM MDT THIS
MORNING FOR BITTERROOT VALLEY AND MISSOULA...

The Winter Weather Advisory has been upgraded.

* Impacts/Timing: Snowfall rates of 1 inch per hour have been
  observed in the Missoula and northern Bitterroot valleys this
  morning. The heavy wet snow accumulating on fully leafed trees
  will continue to produce tree damage including trees and limbs
  breaking. Isolated power outages may also occur. Scattered slush
  covered roads will gradually melt and improve through the
  morning. 

* Snow accumulations: Storm totals of 1 to 3 inches...locally to 
  5 inches has occurred. 

$$

IDZ006-MTZ006-172000-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170517T2000Z/
839 AM MDT Wed May 17 2017 /739 AM PDT Wed May 17 2017/

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MDT /1 PM
PDT/ THIS AFTERNOON ABOVE 4000 FEET...

* Impacts/Timing: Periods of heavy, wet snow has covered many Pass
  roads early Wednesday. The period of the heaviest precipitation
  will be now through the afternoon today. The heavy wet snow may
  damage some trees and will also create slick driving conditions
  and low visibilities at times.
 
* Snow accumulations: Storm totals for 4000 to 5000 feet: 4 to 8 
  inches. Above 5000 feet (including Lolo & Lost Trail Pass): 8 
  to 12 inches with the highest peaks in the Bitterroot 
  Mountains receiving up to 2 feet. 

* Locations impacted include: Dixie, Elk City, Highway 93 Sula 
  to Lost Trail Pass, and Lolo Pass

$$

IDZ009-010-180300-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T0300Z/
839 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING ABOVE 4000 FEET...

* Impacts/Timing: Periods of heavy wet snow continue Wednesday
  morning. The period of heaviest precipitation will be now
  through the afternoon today. The heavy wet snow could damage
  trees, and will create slick driving conditions and low
  visibilities at times mainly over the higher terrain and passes.
  Snow levels are expected to rise above the Salmon area by late 
  morning and early afternoon.
 
* Snow accumulations: Storm totals for 4,000 to 5,000 feet: 1 to 
  4 inches. Above 5,000 feet: 4 to 10 inches including over 
  mountain passes with 12 to 16 inches possible on the highest 
  peaks of the Bitterroot and Lemhi Mountains. 

* Locations impacted include: Bannock Pass, Highway 28 Tendoy to 
  Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, and 
  Lemhi Pass

$$

MTZ007-181445-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
839 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 5000 FEET...

* Impacts/Timing: Periods of wet snow have been occurring
  Wednesday morning. The period of heaviest precipitation will be
  now through the evening today. The heavy wet snow will likely
  damage some trees, and will create slick driving conditions. 

* The addition of slightly warmer air this afternoon may cause 
  the snow level to fluctuate and result in periods of a 
  rain/snow mix in Butte and Anaconda. 

* Snow accumulations: Storm totals for 5,000 to 6,000 feet: 2 to 
  5 inches. 1 to 2 inches below 5000 feet. Above 6,000 feet: 6 
  to 12 inches with up to 2 feet possible throughout the highest 
  terrain. 

* Locations impacted include: Butte, Georgetown Lake, Homestake 
  Pass, and MacDonald Pass

$$

IDZ005-MTZ004-171800-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170517T1800Z/
839 AM MDT Wed May 17 2017 /739 AM PDT Wed May 17 2017/

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
/11 AM PDT/ TODAY...

* Impacts/Timing: Periods of moderate to heavy snow have occurred
  Wednesday morning, especially over the higher terrain. The
  period of heaviest precipitation will be now through the
  afternoon today. The heavy wet snow could damage trees, and 
  will create periods of slick driving conditions. 

* Snow accumulations: Storm totals of 4 to 8 inches of snow for 
  elevations of 4000 feet and above. A trace to 3 inches on 
  grassy areas below 4000 ft. 

$$

074 
WWUS45 KMSO 171612
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
1012 AM MDT Wed May 17 2017

IDZ009-010-181500-
/O.CAN.KMSO.WS.W.0011.000000T0000Z-170518T0300Z/
/O.EXB.KMSO.WW.Y.0025.000000T0000Z-170518T1500Z/
1012 AM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 5000 FEET...
...WINTER STORM WARNING IS CANCELLED...

The National Weather Service in Missoula has cancelled the Winter
Storm Warning.

* Impacts/Timing: Periods of light snow will occur above 5000 feet
  through early tonight. Williams Summit, Gilmore Summit, Bannock
  Pass and Lost Trail Pass will be the areas mostly impacted.
  Roads will be slick at times, but mainly this evening through
  midnight when nighttime cooling will allow any remaining snow to
  accumulate on roads. Local lower visibilities below one mile can
  be expected at times. 

* Snow accumulations: 3 to 6 inches of additional snow is expected
  this afternoon and early tonight over the terrain and mountain
  passes.  

$$

MTZ006-180900-
/O.CAN.KMSO.WS.W.0011.000000T0000Z-170517T2000Z/
/O.EXB.KMSO.WW.Y.0025.000000T0000Z-170518T0900Z/
1012 AM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 3 AM MDT THURSDAY
ABOVE 5000 FEET FOR HIGHWAY 93 SULA TO LOST TRAIL PASS AND LOLO
PASS...
...WINTER STORM WARNING IS CANCELLED...

The National Weather Service in Missoula has cancelled the Winter
Storm Warning. 

* Impacts/Timing: Periods of snow can be expected into early
  tonight. Lolo and Lost Trail Mountain passes will occasionally 
  become snow covered and slick, especially this evening and 
  overnight as temperatures again fall. Visibilities will 
  occasionally lower to below one mile. 

* Snow accumulations: 2 to 4 inches of new snow is expected this
  afternoon and early tonight. 

$$

IDZ006-171715-
/O.CAN.KMSO.WS.W.0011.000000T0000Z-170517T2000Z/
912 AM PDT Wed May 17 2017

...WINTER STORM WARNING IS CANCELLED...

The National Weather Service in Missoula has cancelled the Winter
Storm Warning. 

Periods of light rain and snow can be expected into early tonight.
However, road conditions have improved and little or no additional
snow on main travel routes is expected. 

$$

MTZ005-171715-
/O.EXP.KMSO.WS.W.0011.000000T0000Z-170517T1600Z/
1012 AM MDT Wed May 17 2017

...WINTER STORM WARNING WILL EXPIRE AT 10 AM MDT THIS MORNING FOR
BITTERROOT VALLEY AND MISSOULA...

* Impacts/Timing: Snow will continue to transition to periods of
  rain today. Significant snow loading on trees in parts of
  Missoula and the northern Bitterroot valleys is diminishing. In
  addition, snow or slush covered roads have melted for the most
  part.   

* Snow accumulations: No additional snow is expected the remainder
  of this morning and afternoon. 

$$

IDZ005-MTZ004-171715-
/O.CAN.KMSO.WW.Y.0025.000000T0000Z-170517T1800Z/
1012 AM MDT Wed May 17 2017 /912 AM PDT Wed May 17 2017/

...WINTER WEATHER ADVISORY IS CANCELLED...

The National Weather Service in Missoula has cancelled the Winter
Weather Advisory. 

Periods of light rain and snow can be expected into early tonight.
However, road conditions have improved and little or no additional
snow on main travel routes is expected. 

$$

MTZ007-181500-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
1012 AM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 5000 FEET...

* Impacts/Timing: Periods of moderate to heavy snow can be 
  expected into tonight, mainly above 5000 feet. The heavy wet 
  snow will likely damage some trees, and will create slick 
  driving conditions. In addition, local blowing and drifting snow
  snow will continue along the Continental Divide. 

* The addition of slightly warmer air this afternoon may cause 
  the snow level to fluctuate and result in periods of a 
  rain/snow mix in Butte and Anaconda. 

* Snow accumulations: Storm totals for 5,000 to 6,000 feet: 2 to 5
  inches. Above 6,000 feet: total accumulations of 6 to 12 inches
  with up to 2 feet possible in the highest terrain.
 
* Locations impacted include: Butte, Georgetown Lake, Homestake 
  Pass, and MacDonald Pass

$$

MTZ002-180600-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170518T0600Z/
1012 AM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT ABOVE 4500 FEET FOR MARIAS PASS...

The National Weather Service in Missoula has cancelled the Winter
Storm Warning.

* Impacts/Timing: Periods of light snow will occur through this 
  afternoon, but mainly along the Continental Divide and above 
  4500 feet. For areas that have relatively open access to the 
  public, this mainly includes Marias Pass. Brisk northeast 
  winds will cause areas of blowing and drifting snow over the 
  higher terrain and passes with reduced visibilities. 

* Snow accumulations: 2 to 3 inches of snow is likely over 
  Marias Pass with local heavier amounts along the Continental 
  Divide higher terrain. Otherwise, little or no snow can be 
  expected farther west and in the valley areas. 

$$

345 
WWUS45 KMSO 180556
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
1156 PM MDT Wed May 17 2017

MTZ002-180700-
/O.CAN.KMSO.WW.Y.0025.000000T0000Z-170518T0600Z/
1156 PM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY IS CANCELLED...

Light snow showers are still possible in the Glacier Park Region
and along the Divide overnight, but the best moisture has now 
moved out of the area.

$$

MTZ007-181500-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
1156 PM MDT Wed May 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THURSDAY
ABOVE 5000 FEET...

* Impacts/Timing: Periods of moderate to heavy snow can be
  expected into tonight, mainly above 5000 feet. The heavy wet
  snow will likely damage some trees, and will create slick
  driving conditions. In addition, local blowing and drifting snow
  snow will continue along the Continental Divide.

* Snow accumulations: Storm totals for 5,000 to 6,000 feet: 2 to 
  5 inches. Above 6,000 feet: total accumulations of 6 to 12 
  inches with up to 2 feet possible in the highest terrain. 

* Locations impacted include: Butte, Georgetown Lake, Homestake 
  Pass, and MacDonald Pass

$$

IDZ009-010-181500-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170518T1500Z/
1156 PM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT
THURSDAY ABOVE 5000 FEET...

* Impacts/Timing: Periods of light snow will occur above 5000 feet
  through early tonight. Williams Summit, Gilmore Summit, Bannock
  Pass and Lost Trail Pass will be the areas mostly impacted.
  Roads will be slick at times. Local lower visibilities below one
  mile can be expected at times. 

$$

MTZ006-180900-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170518T0900Z/
1156 PM MDT Wed May 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM MDT
THURSDAY ABOVE 5000 FEET FOR HIGHWAY 93 SULA TO LOST TRAIL PASS
AND LOLO PASS...

* Impacts/Timing: Periods of snow can be expected into early
  tonight. Lolo and Lost Trail Mountain passes will occasionally
  become snow covered and slick, especially this evening and
  overnight as temperatures again fall. Visibilities will
  occasionally lower to below one mile. 

$$

139 
WWUS45 KMSO 180851
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
251 AM MDT Thu May 18 2017

MTZ006-181000-
/O.CAN.KMSO.WW.Y.0025.000000T0000Z-170518T0900Z/
251 AM MDT Thu May 18 2017

...WINTER WEATHER ADVISORY IS CANCELLED...

Light snow showers are still possible in the Bitterroot and
Sapphire Ranges of western Montana overnight, but the best 
moisture has now moved out of the area.

$$

MTZ007-181500-
/O.CON.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
251 AM MDT Thu May 18 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THIS
MORNING ABOVE 5000 FEET...

* Impacts/Timing: Periods of moderate to heavy snow can be 
  expected into tonight, mainly above 5000 feet. The heavy wet 
  snow will likely damage some trees, and will create slick 
  driving conditions. In addition, local blowing and drifting 
  snow snow will continue along the Continental Divide. 

* Snow accumulations: Storm totals for 5,000 to 6,000 feet: 2 to 
  5 inches. Above 6,000 feet: total accumulations of 6 to 12 
  inches with up to 2 feet possible in the highest terrain. 

* Locations impacted include: Butte, Georgetown Lake, Homestake 
  Pass, and MacDonald Pass

$$

IDZ009-010-181500-
/O.CON.KMSO.WW.Y.0025.000000T0000Z-170518T1500Z/
251 AM MDT Thu May 18 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS
MORNING ABOVE 5000 FEET...

* Impacts/Timing: Periods of light snow will occur above 5000 
  feet through early tonight. Williams Summit, Gilmore Summit, 
  Bannock Pass and Lost Trail Pass will be the areas mostly 
  impacted. Roads will be slick at times. Local lower 
  visibilities below one mile can be expected at times. 

$$

246 
WWUS45 KMSO 180921
WSWMSO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
321 AM MDT Thu May 18 2017

MTZ007-181030-
/O.CAN.KMSO.WS.W.0011.000000T0000Z-170518T1500Z/
321 AM MDT Thu May 18 2017

...WINTER STORM WARNING IS CANCELLED...

Light snow showers are still possible over mountain passes such as
MacDonald and Homestake through the early morning hours, but the 
best moisture has now moved out of the area. Approaches to these
passes could be slick in spots, but conditions will continue to
improve throughout the morning.

$$

IDZ009-010-181030-
/O.CAN.KMSO.WW.Y.0025.000000T0000Z-170518T1500Z/
321 AM MDT Thu May 18 2017

...WINTER WEATHER ADVISORY IS CANCELLED...

Light snow showers are still possible over the high terrain,
including Gilmore Summit, through the early morning hours, but 
the best moisture has now moved out of the area. Conditions will 
continue to improve throughout the morning.

$$

Area Forecast Discussion
National Weather Service Missoula MT
329 AM MDT Tue May 16 2017

...Snow returns to the Northern Rockies starting tonight, and
continuing through Thursday morning...

.DISCUSSION...For the most part, very little has changed with our
spring snow storm that is forecast to impact the Northern Rockies
starting tonight and continuing into Thursday morning. However,
we have gained enough confidence with expected impacts to add the
Seeley/Swan region above 4000 feet to the Winter Weather Watches,
as well as Marias Pass and elevations above 4000 feet in Glacier
National Park. We have also issued a Winter Weather Advisory for
the Lower Clark Fork region above 4000 feet, due to accumulating
snow for Lookout Pass and Evaro Hill. An advisory has also been
issued for Whitebird Hill in north central Idaho. Specifics for
each region under Winter Weather Watches or Advisories can be
found on our website at www.weather.gov/missoula.

The upper level low pressure system is still forecast to develop and
slowly move over north-central Idaho beginning this evening. The
heaviest precipitation is expected to start around 6pm PDT and
last through midnight. During this time, the precipitation could
be heavy enough to drive the snow levels down to around 3000 feet,
giving some of the lower valleys of the Camas Prairie a chance
for light accumulating snow. However, most accumulating snow will
be above 4000 feet, where several inches will be likely for
locations such as Whitebird Hill, Dixie, and Elk City. As the low
pressure slides to the southeast Wednesday, some of these same
locations could see another round of snow from the wrap around
moisture in the afternoon and evening.

For areas of western Montana, impacts from this storm will begin
overnight tonight, and will linger into Thursday morning. As the
low passes to the south and east tonight, a particularly large
area of enhanced precipitation will develop and rotate around the
low through much of the region. Impacts due to accumulating snow
will primarily be for locations above 4000 feet for southwest
Montana, west-central Montana, and north along the Continental
Divide. However, there is the possibility for lower elevations,
such as the Missoula/Bitterroot Valleys, to see a light slushy
accumulation of snow for the Wednesday morning commute. The
greater concern, will be for southwestern Montana and along the
Continental Divide, where several inches of snow will be
possible. Those in the high terrain could see up to a foot. The
heavy wet snow in these areas may produce damage to any trees
that have already leafed out. Falling trees or branches could
also create scattered power outages. For those traveling,
significant accumulations over mountain passes such as Homestake,
MacDonald, and Marias will create hazardous driving conditions
through Thursday morning. Hwy 1 to Philipsburg and Georgetown
Lake could also be treacherous, with 9 inches to over a foot of
snow forecast in 48 hours above 6000 feet in that area.

On Thursday, the impactful low pressure system will have moved to
the southeast, leaving the Northern Rockies firmly under a
northwest flow pattern. The persistent ridge over the West Coast
and trough over the central U.S. keeps this pattern going through
the middle of next week. Temperatures will be seasonal, with most
places warming by a few degrees each day. Showers will be an
almost daily possibility in the higher terrain near the Divide,
but other locations will likely only see partly cloudy skies with
some mountain showers. The wettest period during this timeframe
still looks to be Saturday evening into Sunday, when a shortwave
trough enhances lift and brings a round of widespread showers to
valleys.

&&

.AVIATION...Today the Northern Rockies will see a progression
from fair flying conditions this morning to low ceilings, rain,
and snow mixing in tonight. Timing is highlighted in the TAFs, but
overall the system will move west to east, first impacting north
central Idaho sites later this morning, eventually reaching
western Montana this evening. Winds become breezy as the system
moves in this afternoon and evening. Precipitation looks to
transition to snow for elevations above 3000 feet overnight, with
accumulations possible on surfaces (especially above 4000 feet) by
the Wednesday AM.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Winter Storm Watch from this evening through Wednesday afternoon
     ABOVE 4000 FEET for the Bitterroot/Sapphire Mountains.

     Winter Storm Watch from late tonight through Thursday morning
     ABOVE 4000 FEET for the Potomac/Seeley Lake Region...West
     Glacier Region.

     Winter Storm Watch from late tonight through Thursday morning
     ABOVE 5000 FEET for the Butte/Blackfoot Region.

     Winter Weather Advisory from midnight tonight to noon MDT
     Wednesday ABOVE 4000 FEET for the Lower Clark Fork Region.

ID...Winter Weather Advisory from 8 PM this evening to 1 PM PDT
     Wednesday ABOVE 4000 FEET for the Lower Hells Canyon/Salmon
     River Region.

     Winter Storm Watch from this evening through Wednesday afternoon
     ABOVE 4000 FEET for the Southern Clearwater Mountains.

     Winter Storm Watch from late tonight through Wednesday evening
     ABOVE 4000 FEET for the Eastern Lemhi County...Western
     Lemhi County.

&&