Snow and Avalanche Report

Lochaber - Issued 18/4/2014

Avalanche Hazard Forecast

FOR PERIOD 18:00HRS Fri 18/4/2014 TO 18:00HRS Sat 19/4/2014

compassRose
Hazard LevelAvalanche Probability
Very High

Avalanche Hazard

Widespread natural avalanches will occur, often continually. Frequent, medium to large sized avalanches, with long run outs, will occur on most aspects; the snowpack is weakly bonded in these locations. Rare extreme conditions.

Travel Advice

Widespread natural avalanches will occur. Human triggered avalanches will occur with single person loading on most slopes. Experience in avalanche hazard evaluation essential. Good visibility and very good route finding in mountain terrain essential. Awareness and avoidance of runout zones at low altitudes essential. Good group management and safe travel using mountain features essential.(eg: Ridges, protected slopes)

Widespread Natural and Human triggered avalanches will occur.
High

Avalanche Hazard

Natural avalanches will occur, sometimes frequently. Medium to large sized avalanches, with long run outs, will occur in the locations indicated in the reports; the snowpack is weakly bonded in these locations. Human triggered avalanches will occur.

Travel Advice

Natural avalanches will occur. Human triggered avalanches will occur with single person loading. Experience in avalanche hazard evaluation essential. Good visibility and very good route finding in mountain terrain essential. Awareness and avoidance of runout zones at low altitudes essential. Good group management and safe travel using mountain features essential.(eg Ridges, protected slopes)

Natural and Human triggered avalanches will occur.
Considerable

Avalanche Hazard

Medium to large sized natural avalanches possible. In locations indicated in the reports, human triggered avalanches are likely; The snowpack is poor to weakly bonded in these locations.

Travel Advice

Natural avalanches possible. Human triggered avalanches likely with single person loading. Experience in avalanche hazard evaluation important. Good visibility and very good route finding in mountain terrain is necessary. Good group management and safe travel using mountain features necessary.(eg Ridges, protected slopes)

Natural Avalanches possible.
Human triggered avalanches are likely.
Moderate

Avalanche Hazard

Large natural avalanches unlikely. Avalanches in steep locations are possible. Human triggered avalanches possible. The snowpack is only moderately well bonded on some steep slopes, or moderate to poorly bonded, in isolated steep locations as indicated in the reports. Elsewhere generally well bonded.

Travel Advice

Human triggered avalanches possible. Experience in avalanche hazard evaluation important. Good visibility and good route selection required, especially in steep locations as indicated in the reports. Good spacing between persons is necessary to reduce loading on slopes. Good group management and use of safe travel mountain features important. (eg Ridges, protected slopes)

Natural Avalanches unlikely.
Human triggered avalanches possible.
Low

Avalanche Hazard

Natural avalanches unlikely but in some conditions small avalanches in steep locations are possible. Human triggered avalanches not likely. Generally the snowpack is well bonded and stable.

Travel Advice

Human triggered avalanches not likely, generally safe travel conditions

Natural Avalanches very unlikely.
Human triggered avalanches not likely.
View Hazard and Travel Advice

localized  Localized Avalanche Hazard

Forecasted Weather Influences

It is expected to remain dry with light winds and the freezing level above the summits.

Forecasted Snow Stability and Avalanche Hazard

Localised instabilities will remain, mainly on steep North through East to South-East aspects above 1000 metres. Surface instabilities are likely to develop on slopes affected by the effects of the sun. Otherwise the snowpack will be generally stable. Remaining cornices will be prone to collapse. The avalanche hazard will be Moderate.

Observed Avalanche Hazard - Fri 18/4/2014

Observed Weather Influences

It was a dry sunny day with light winds. Freezing level rising above summits.

Observed Snow Stability and Avalanche Hazard

The surface of the snowpack was initially firm but softened noticeably as the day progressed. Localised instabilities remain, mainly on steep North through East to South-East aspects above 1000 metres. Surface instabilities were also noted on slopes affected by the sun. The avalanche hazard is Moderate.

Mountain Conditions
Observed Mountain Travel ConditionsExtensive snow cover at higher levels, especially in N, NE and E facing coires. Clear sky with bright sunshine. Light winds.
CommentsThere are still substantial cornices above some slopes and they will collapse sometime! Many large, and some very large, deep cracks are present in the snowpack, some in unusual places, and others a long way back from the edge.

Key Snow Stability Observations

What do these icons mean?

Latest Blog Posts

Supported by

Nevis Range - http://nevisrange.co.uk Visit the Mountain Equipment website