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Avalanche bulletin through Sunday, 24 February 2019

Gliding avalanches are the main danger

Edition: Sa. 23.02., 17:00 Next update: Su. 24.02., 08:00 Validity

Avalanche bulletin through Sunday, 24 February 2019

Gliding avalanches are the main danger

Edition Sa. 23.02., 17:00 Next update Su. 24.02., 18:00 Validity

Avalanche bulletin through Sunday, 24 February 2019

Gliding avalanches are the main danger

Edition Sa. 23.02., 17:00 Next update Su. 24.02., 08:00 Validity

Avalanche bulletin through Sunday, 24 February 2019

Gliding avalanches are the main danger

Edition Sa. 23.02., 17:00 Next update Su. 24.02., 08:00 Validity

 
Level 2, moderate

Dry avalanches: Old snow

Avalanche prone locations
In particular in northwest to north to northeast facing aspects above approximately 2000m.

In particular in northwest to north to northeast facing aspects above approximately 2000m.

Danger description

Faceted weak layers exist in the snowpack. In isolated cases avalanches can be released in the old snowpack and reach medium size. The avalanche prone locations are to be found in particular on little-used, rather lightly snow-covered slopes and in areas close to the tree line.
On Saturday small wind slabs formed as well. These are to be assessed with care and prudence.
Apart from the danger of being buried, restraint should be exercised in particular in view of the danger of avalanches sweeping people along and giving rise to falls.

Gliding avalanches

Danger map Gliding

see also snowpack and weather

Level 1, low

Dry avalanches: Old snow, wind slabs

In very isolated cases avalanches can be released in the old snowpack. Caution is to be exercised in particular in areas where the snow cover is rather shallow and in areas close to the tree line.
In the last two days small wind slabs formed in some localities, especially in pass areas as well as at elevated altitudes on steep west, north and east facing slopes. These are to be assessed with care and prudence.
Even a snow slide can sweep snow sport participants along and give rise to falls.

Gliding avalanches

Danger map Gliding

see also snowpack and weather

Level 1, low

Dry avalanches:

Hardly any more dry avalanches are possible.

Gliding avalanches

Danger map Gliding

see also snowpack and weather

Level 1, low

Dry avalanches: Wind slabs

In the last two days small wind slabs formed in some localities, especially in pass areas as well as at elevated altitudes on steep west, north and east facing slopes. These are to be assessed with care and prudence. Even a snow slide can sweep snow sport participants along and give rise to falls.

Gliding avalanches

Danger map Gliding

see also snowpack and weather

Level 2, moderate

Gliding avalanches

Avalanche prone locations
In particular in east to south to west facing aspects below approximately 2600m.

In particular in east to south to west facing aspects below approximately 2600m.

Danger description

Until the middle of the day, individual, then as a consequence of warming during the day and solar radiation more gliding avalanches are to be expected. These can reach large size in isolated cases. Caution is to be exercised in areas with glide cracks.

Dry avalanches

Danger map Dry

see also snowpack and weather

Level 1, low

Gliding avalanches

On steep sunny slopes individual wet and gliding avalanches are possible as the day progresses. Caution is to be exercised in areas with glide cracks.

Dry avalanches

Danger map Dry

see also snowpack and weather

Level 1, low

Gliding avalanches

On steep sunny slopes wet and gliding avalanches are possible as the day progresses, but they will be mostly small. Caution is to be exercised in areas with glide cracks.

Dry avalanches

Danger map Dry

see also snowpack and weather

Level 3, considerable

Gliding avalanches

Avalanche prone locations
In particular in east to south to west facing aspects below approximately 2800m.

In particular in east to south to west facing aspects below approximately 2800m.

Danger description

Until the middle of the day, individual, then as a consequence of warming during the day and solar radiation more gliding avalanches are to be expected. These can reach large size. Caution is to be exercised in areas with glide cracks. Transportation routes situated at higher altitudes can be endangered in some cases.
In addition as the day progresses an increasing number of small and, in isolated cases, medium-sized wet avalanches are to be expected. Backcountry tours and off-piste skiing should be concluded timely.

Dry avalanches

Danger map Dry

see also snowpack and weather

Gliding avalanches are the main danger
Edition: 23.2.2019, 17:00 / Next update: 24.2.2019, 18:00
Snowpack
During nights when skies are clear, a crust capable of bearing loads forms up to high altitudes on steep, south-facing slopes. As a consequence of solar radiation and higher temperatures during the daytime, glide-snow avalanches and, to an increasing degree, also wet-snow avalanches can be expected on very steep east and south and west-facing slopes below approximately 2800 m more than anywhere else. In isolated cases, glide-snow avalanches can also be triggered during the nighttime or in the early morning hours. Glide-snow avalanches can in some places grow to large size north of an imaginary Rhine-Rhone line and from northern Grisons into the northern Lower Engadine more than anywhere else. On north-facing slopes, the snowpack surface is often expansively metamorphosed (faceted) and loosely-bonded or, particularly at high altitudes and in pass areas, heavily impacted by winds. Since last Friday, snowdrift accumulations have been freshly generated. Most of them are small-sized, but on shady slopes they were deposited on top of an unfavourable old snowpack surface. In addition, in the middle section of the snow cover, especially in the western sector of the northern flank of the Alps, in the Valais and in Grisons, there are expansively metamorphosed (faceted) and soft layers evident in places. However, these layers are hardly still prone to triggering. In places where the snow is relatively shallow, the entire snowpack is often metamorphosed and loosely-bonded.
Observed weather on Saturday, 23.02.2019
During the early part of Friday night, skies in eastern regions are expected to clear up. Subsequently it will become sunny in the mountains during the daytime on Friday, apart from high-altitude cloudbanks which will pass through.
Fresh snow
-
Temperature
At midday at 2000 m, between +8 °C in the western regions, +4 °C from central Switzerland well into the Ticino and +1 °C in the eastern regions.
Wind
Winds were easterly to northeasterly,
  • blowing predominantly at moderate to strong velocity on Friday night along the northern Alpine Ridge as well as in the central and eastern sectors of the Main Alpine Ridge, at storm strength in the Jura region;
  • generally blowing at light to moderate strength during the daytime on Saturday, at strong velocity in some high altitude places.
Weather forecast through Sunday, 24.02.2019
It will be sunny in the mountains.
Fresh snow
-
Temperature
At midday at 2000 m, between +8 °C in western regions, +6 °C in southern regions and +4 °C in eastern regions.
Wind
Winds will be northeasterly,
  • blowing generally at light strength;
  • blowing intermittently at moderate strength, particularly on the northern Alpine Ridge and at high altitudes along the Main Alpine Ridge.
Outlook through Tuesday, 26.02.2019
It will be sunny on both days, accompanied by occasional high-altitude cloudbanks on Tuesday in particular. The northeasterly winds will be blowing predominantly at moderate strength at high altitudes more than anywhere else. Each day, the temperatures will increase another notch. On Tuesday, the zero-degree level will be at 3400 m, slightly lower in the furthermost eastern regions.
The danger of dry-snow avalanches is not expected to change significantly. The danger of wet-snow and glide-snow avalanches is expected to increase significantly during the course of each day.
 

Your observations can improve the quality of the avalanche bulletin. We are very grateful for any reports and photos received.

Please report your observations of avalanches or alarm signs, or your estimation of the avalanche danger, or simply send us a picture illustrating the current situation. Your report from the field will be considered along with all the other information when we assess the avalanche danger. It is impossible, however, to reflect the exact content of each individual report in the avalanche bulletin.

The best way to file a report is by completing the interactive form on this page. If your report is to be used in the 5 pm avalanche bulletin, it should be submitted before 2:30 pm if possible. Reports received later will normally be given consideration in the next assessment.

Other reporting options:

Gliding avalanches are the main danger
Edition: 23.2.2019, 17:00 / Next update: 24.2.2019, 18:00
Snowpack
During nights when skies are clear, a crust capable of bearing loads forms up to high altitudes on steep, south-facing slopes. As a consequence of solar radiation and higher temperatures during the daytime, glide-snow avalanches and, to an increasing degree, also wet-snow avalanches can be expected on very steep east and south and west-facing slopes below approximately 2800 m more than anywhere else. In isolated cases, glide-snow avalanches can also be triggered during the nighttime or in the early morning hours. Glide-snow avalanches can in some places grow to large size north of an imaginary Rhine-Rhone line and from northern Grisons into the northern Lower Engadine more than anywhere else. On north-facing slopes, the snowpack surface is often expansively metamorphosed (faceted) and loosely-bonded or, particularly at high altitudes and in pass areas, heavily impacted by winds. Since last Friday, snowdrift accumulations have been freshly generated. Most of them are small-sized, but on shady slopes they were deposited on top of an unfavourable old snowpack surface. In addition, in the middle section of the snow cover, especially in the western sector of the northern flank of the Alps, in the Valais and in Grisons, there are expansively metamorphosed (faceted) and soft layers evident in places. However, these layers are hardly still prone to triggering. In places where the snow is relatively shallow, the entire snowpack is often metamorphosed and loosely-bonded.
Observed weather on Saturday, 23.02.2019
During the early part of Friday night, skies in eastern regions are expected to clear up. Subsequently it will become sunny in the mountains during the daytime on Friday, apart from high-altitude cloudbanks which will pass through.
Fresh snow
-
Temperature
At midday at 2000 m, between +8 °C in the western regions, +4 °C from central Switzerland well into the Ticino and +1 °C in the eastern regions.
Wind
Winds were easterly to northeasterly,
  • blowing predominantly at moderate to strong velocity on Friday night along the northern Alpine Ridge as well as in the central and eastern sectors of the Main Alpine Ridge, at storm strength in the Jura region;
  • generally blowing at light to moderate strength during the daytime on Saturday, at strong velocity in some high altitude places.
Weather forecast through Sunday, 24.02.2019
It will be sunny in the mountains.
Fresh snow
-
Temperature
At midday at 2000 m, between +8 °C in western regions, +6 °C in southern regions and +4 °C in eastern regions.
Wind
Winds will be northeasterly,
  • blowing generally at light strength;
  • blowing intermittently at moderate strength, particularly on the northern Alpine Ridge and at high altitudes along the Main Alpine Ridge.
Outlook through Tuesday, 26.02.2019
It will be sunny on both days, accompanied by occasional high-altitude cloudbanks on Tuesday in particular. The northeasterly winds will be blowing predominantly at moderate strength at high altitudes more than anywhere else. Each day, the temperatures will increase another notch. On Tuesday, the zero-degree level will be at 3400 m, slightly lower in the furthermost eastern regions.
The danger of dry-snow avalanches is not expected to change significantly. The danger of wet-snow and glide-snow avalanches is expected to increase significantly during the course of each day.

Latest avalanche bulletins

 

Have you observed alarm signs or an avalanche?

Your observations can improve the quality of the avalanche bulletin. We are very grateful for any reports and photos received.

 

More information about observations

Please report your observations of avalanches or alarm signs, or your estimation of the avalanche danger, or simply send us a picture illustrating the current situation. Your report from the field will be considered along with all the other information when we assess the avalanche danger. It is impossible, however, to reflect the exact content of each individual report in the avalanche bulletin.

The best way to file a report is by completing the interactive form on this page. If your report is to be used in the 5 pm avalanche bulletin, it should be submitted before 2:30 pm if possible. Reports received later will normally be given consideration in the next assessment.

Other reporting options:

 

No avalanche bulletins are being published at the moment. Nevertheless, you should still stay up to date with the avalanche situation in the mountains, especially if there is fresh snow.

However, the SLF will, by way of exception, also issue avalanche bulletins in the summer in case of heavy snowfall. There are different ways you can be notified when these bulletins based on the snow situation are published:

  • by push alert on SLF's free White Risk mobile app: appearing in four languages (English, German, French and Italian), this can be downloaded from iTunes App Store (for iPhones) or Google Play Store (for Android);
  • by mobile text message (SMS): please send an SMS with the message START SLF SOMMER to the phone number 9234 – you can cancel this service at any time by sending an SMS with the message STOP SLF SOMMER; cost: CHF 0.20 per SMS;
  • via an RSS feed which informs you whenever an avalanche bulletin is published.

Depending on the snow and avalanche situation, the regular publication of avalanche bulletin recommences in November/December.

Latest avalanche bulletins

 

Have you observed alarm signs or an avalanche?

Your observations can improve the quality of the avalanche bulletin. We are very grateful for any reports and photos received.

 

More information about observations

Please report your observations of avalanches or alarm signs, or your estimation of the avalanche danger, or simply send us a picture illustrating the current situation. Your report from the field will be considered along with all the other information when we assess the avalanche danger. It is impossible, however, to reflect the exact content of each individual report in the avalanche bulletin.

The best way to file a report is by completing the interactive form on this page. If your report is to be used in the 5 pm avalanche bulletin, it should be submitted before 2:30 pm if possible. Reports received later will normally be given consideration in the next assessment.

Other reporting options:

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