Avalanche Advisory published on April 3, 2019 @ 6:56 am
Issued by George Halcom - Payette Avalanche Center
bottom line

The Avalanche Hazard is Moderate Today. Use caution in or around steep terrain between 5,000 feet and 7,000 feet. Temperatures have been above freezing and rain will continue to fall on the snow surface making human triggered wet-loose avalanches possible. 

How to read the advisory

  • Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Avalanche Problem 1: Loose Wet
  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Very Likely
  • Size ?
    Very Large

 Today, your best chance of kicking loose a wet loose slide would be on very steep lower elevation slopes.  Overnight, the temperatures have remained above freezing in the lower elevations, and rain is falling. Today, rain is forecasted all the way up to 7,000 feet.  If you are skiing or riding in the rain today, be cautious in steep terrain between 5&7,000 feet!




advisory discussion

PAC will issue 3 Advisories per week through April 5. 

Your Observations are extremely helpful and appreciated by all backcountry users.  If you have not checked our our Observations page, it is really easy to add snow or avalanche info.  Drop down menus and prompts will lead you through it and it is easy to add photos.

Please be aware that there are areas that are CLOSED to motorized traffic in the McCall, Goose Lake and greater West Mountains area.  Just because there are tracks in some areas, does not mean they are open.  Please respect all users and closures.  See the Payette Winter Travel Maps for clarification.  Both the East and West maps can be downloaded on the Avenza app on your phone or are available at trailheads and local shops.   IT IS YOUR RESPONSIBILITY TO KNOW WHERE YOU ARE AND WHERE THESE CLOSURES EXIST. 

recent observations

Near Upper Hazard Lake Yesterday, we observed some wet-loose activity on a steep North aspect that got warm from the rising temperature. The upper 2 inches of the snow consists of large melt-freeze grains that have been very firm until about 11am, and have challenged snowmobile running temperatures. Other Southern aspects have a lot of older debris from the temperature swings and Solar gain. Soft snow exists in the upper elevations, but with a punchy, denser surface layer that was resistant to softening under the intermittent snow flurries and clouds. As the day, and the approaching storm progressed our goggles were saturated which made the ride out to the trail head nice.







CURRENT CONDITIONS Today's Weather Observations From the Granite Weather Station at 7700 ft.:
0600 temperature: 30 deg. F.
Max. temperature in the last 24 hours: 34 deg. F.
Average wind direction during the last 24 hours: W
Average wind speed during the last 24 hours: 5 mph
Maximum wind gust in the last 24 hours: 10 mph
New snowfall in the last 24 hours: NA inches
Total snow depth: NA inches

Area Forecast Discussion
National Weather Service Boise ID
300 AM MDT Wed Apr 3 2019

.SHORT TERM...Today through Saturday...Showers remain present
over portions of the area tonight as the trough axis continues its
eastward progression. With its departure, some clearing has been
enough to introduce pockets of lowered ceilings. Models working to
show the potential for another weak disturbance moving through
the area this morning, which may produce some shower activity
across the valleys. A return of moisture expected this afternoon,
with isolated thunderstorms over the West Central Mountains of
Idaho. Unsettled conditions over the area will then leave
afternoon showers through the rest of the week. Snow levels
generally hover between 6000 and 7000 ft through Friday morning.
Models starting to show some instability on Thursday afternoon
across southeastern Oregon, but opted to give models another run
to attempt some consistency in this idea. A more impressive wave
is favored to impact the area on Friday, which looks to produce
gusty wind with its arrival, especially across southeastern
Oregon. Widespread precipitation anticipated Friday afternoon and
into Saturday morning. Snow levels with this upcoming system are
expected to drop to 4000 to 5000 ft. Temperatures through the
period generally warm through Thursday, with slight cooling Friday
and Saturday.

.LONG TERM...Saturday night through Wednesday...Unsettled weather
will continue, with moist west-southwest flow aloft Saturday night
through Monday night bringing periods of showers and temperatures
around 5 degrees above normal. Tuesday and Wednesday an upper level
trough from the Gulf of Alaska, followed by northwest flow aloft,
will lower temperatures to slightly below normal.


.AVIATION...Mountains obscured. Areas of low VFR and MVFR with local
IFR conditions in low clouds and showers. Snow level near 6500 ft
MSL. Conditions improving to mostly VFR lower elevations this
afternoon. Patchy valley fog tonight. Surface winds variable less
than 10 kts this morning becoming west 10-15 kts this afternoon.
Winds aloft at 10k ft MSL southwest to west 15-25 kts.

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Wednesday Wednesday Night Thursday
Weather: Showers. High near 46. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 90%. Showers, mainly before 1am. Patchy fog after 1am. Low around 33. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%. Showers likely, mainly after 1pm. Patchy fog before 1pm. Otherwise, cloudy, with a high near 48. Calm wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 60%.
Temperatures: 46 deg. F. 33 deg. F. 48 deg. F.
Wind direction: SSW SSW SSW
Wind speed: 5 5 becoming calm 6
Expected snowfall: 0 in. 0 in. 0 in.
Granite Mountain at 7700 feet.
  Wednesday Wednesday Night Thursday
Weather: Snow showers. High near 35. South southwest wind 6 to 9 mph. Chance of precipitation is 90%. Total daytime snow accumulation of 1 to 2 inches possible. Snow showers likely, mainly before midnight. Cloudy, with a low around 29. South southwest wind 6 to 9 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible. A chance of snow showers before noon, then rain and snow showers likely. Cloudy, with a high near 36. South wind 7 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Temperatures: 35 deg. F. 29 deg. F. 36 deg. F.
Wind direction: SSW SSW S
Wind speed: 6-9 6-9 7-10
Expected snowfall: 1-2 in. Less than one half in. Less than one half in.

This avalanche advisory is provided through a partnership between the Payette National Forest and the Payette Avalanche Center. This advisory covers the West Central Mountains between Hard Butte on the north and Council Mountain on the south. This advisory applies only to backcountry areas outside established ski area boundaries. This advisory describes general avalanche conditions and local variations always occur. This advisory expires at midnight on the posted day unless otherwise noted. The information in this advisory is provided by the USDA Forest Service who is solely responsible for its content.