Avalanche Advisory
Advisory: Provo Area Mountains Issued by Mark Staples for Thursday - April 5, 2018 - 5:44am
bottom line

With a deep slab avalanche problem lurking on upper elevation, northerly and easterly facing slopes, the avalanche danger in these locations is MODERATE. Avalanches that occurred last Wednesday show that this deep slab problem is still an issue in the Provo area mountains. These slides can break 2-5 feet deep and up to hundreds of feet wide. All other slopes have a LOW danger. Watch for and avoid any fresh wind drifts and wind slabs. These are much less of a hazard but worth looking for. Hard, icy conditions also exist. While not an avalanche hazard, these "slide for life" conditions add an additional hazard in very steep terrain.
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current conditions

Mountain temperatures this morning above 8000 feet are in the mid 30's F with westerly winds averging 10 mph gusting to 15 mph. The snowpack is mostly hard and frozen.
recent activity

No avalanche activity was reported yesterday.

There was an impressive avalanche cycle that occurred last week on Timpanogos. The snowpack in the Provo area mountains is very different and more dangerous that in the mountains just a little further north. Read the full observation HERE. Below is a list of some of these slides and a photo (J. Woodruff) of the debris pile from one of them.

  • Emerald Lake Headwall (Timp Glacier) 800' wide by 3'-5' deep. 11200' down to 10600' (600' vertical foot fall).
  • Below the summit shack on the NE face. (wind slab). 60' wide by 2' deep. 11200' down to 10400' (800' vertical foot fall.)
  • Timp Basin Ridge just north of the summer trail. 500' wide by 6'-9' deep. 11000' down to 10800' (300' vertical foot fall)
  • The largest slide and thanks to the pictures from Turly (Found HERE) we were able to determine that the entire slope to the north of the natural that he photographed including wrapping into Stairmaster bowl had avalanched. 11200' down to possibly 8500' (2700' vertical foot fall with a substantial debris pile)
Avalanche Problem 1
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 24 hours
description

The snowpack in the Provo area mountains is generally more dangerous than other areas further north. This area received less snowfall in the early months of winter, making it more shallow and weaker. Unfortunately many of those weak, faceted layers of snow remain at the upper elevation, northerly facing slopes. All it took to cause last week's avalanche cycle was strong winds. There are two layers of concern in the snowpack:

  1. One is faceted snow buried just underneath the February 18th dust layer. It's easy to find - dig down 2.5' in the snowpack and identify a dirty stripe of snow, just below that is a layer of weak faceted snow.
  2. The other is just above the ground - we call it depth hoar, which is a fancy name for larger grained faceted snow. In either case the avalanche you trigger would likely be unsurvivable.

It's best to avoid any and all steep northerly facing terrain. If going to ski some of the Peaks in the Provo area, it will be best to ski slopes that face a little more southerly. Go to these slopes after a few melt/freeze cycles and hopefully enjoy some stable corn skiing. In the near term
Avalanche Problem 2
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 24 hours
description

The snowpack has a hard frozen surface. A few inches of snow plus strong winds Monday night created isolated wind drifts and wind slabs. Watch out for "slide for life" conditions in steep terrain where the hard icy snow means you may not be able to stop if you fall. Cloud cover today should limit warming and softening of the snowpack.
weather

Today will be similar to yesterday with mostly cloudy skies that will limit much warming. High temperatures at 9000 feet should reach the mid 30's F or slightly warmer. Winds will remain light averging about 10 mph. Moisture will arrive tonight with a disturbance that will bring and inch or two of snow above 9000 feet and rain below that elevation. Cloudy skies will remain over the area Friday. A warm storm will arrive on Saturday. The rain/snow line will again be around 9000 feet and winds should increase. Above that elevation 3-6 inches of snow should fall. Sunday will have cooler temperatures and lingering snow showers.
general announcements

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This information does not apply to developed ski areas or highways where avalanche control is normally done. This advisory is from the U.S.D.A. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur.