Chamonix weather forecast snow report from Henry's Avalanche Talk

Snow report April 18

Last week I said that our experience off-piste has been, “great despite totally unpredictable weather and days that you would think aren’t going to be good.. but then they turn out to be great!” This trend of passing storms then sun, then passing storms then sun…. has continued over the last week and will continue this coming week too – but with warmer temperatures forecasted at least over the weekend. The weather pattern that has brought us ‘winter in spring’ since the first week of March has provided us with some of the most phenomenal skiing I’ve ever experienced here in the French Alps. For me, reporting from the higher Alpine resorts where the skiing is mostly above 2000 metres, the best skiing has been almost exclusively ‘winter snow skiing’ (on snow that has not been through melting & freezing cycles). Last week was again characterized mainly by winter conditions - although when the sun comes out, you feel it’s spring (well it is mid-April after all!). As a result of the strong solar radiation that is often been present even when cloudy, we have been going ‘high and north’ to take advantage of the cooler, shaded areas where the snow gets the least amount of incoming solar radiation/heat. See photos of touring and skiing this past week on www.henrysavalanchetalk.com > Free Stuff > Photo Albums > Skiing with HAT (www.hat.skioffpiste.co.uk/photos/hatskiing/index.html ). The trick still seems to be getting out early (despite wind, bad visibility etc.), going as high as possible (above 2500 metres) and looking for slopes that are sheltered from the wind [winds seem to have been coming out of the Southwest to East in much of the Northern French Alps and this is supposed to continue well into the week of April 21]. Below 2500 metres there has been quite q bit of melting and freezing (spring snow) which is pretty nice if it is smooth but awful where there are old frozen tracks, frozen avalanche debris or if the melt-freeze crust is not thick enough to hold your weight (breakable curst is not nice)!

Snowpack Quality & Stability

It looks like the successive storms and clearing will continue with a significant increases in temperatures, especially from 18-20 April, which means we have to watch out for big wet snow avalanches on slopes that are going to get the sun, are at lower altitudes and therefore are going to subject to rapid warming (I’ve already heard of a number of avalanches coming down onto pistes that were closed due to avalanche danger). For Sunday to Wednesday, the rain snow limit is forecast to stay around 2000 metres which is not all that high for this time of year, and that means more great skiing!

Otherwise, the light/moderate snowfalls and wind have continued to form surface slabs, mostly above 2500/2700 m. The wind, the sun, warming and precipitation will encourage some instability and avalanche activity on sufficiently steep slopes, a little at all altitudes. Below 2500/2700 a relatively small surface slab may turn into a larger wet snow avalanches; above that, they could lead to bigger slab avalanches too in the form of dry/cold snow slabs. The risk of these types of slabs is most prevalent on Northeast to Northwest facing slopes (the ones that we are skiing on most). So I will be especially careful if we get 20 cm or more in one storm - or in a short amount of time like 48 hours, especially if there is a good amount of wind, which can lead to twice the amount of snow that came out of the sky on these sheltered slopes (again these are the slopes that will have the best skiing). I’ll be limiting the risk mainly be avoiding steep slopes that have cliffs and/or narrow valley bottoms below them. A person was killed on the 15th due to a relatively small avalanche that took him over some cliffs: see www.pistehors.com

Tip of the week:
I’ve been long-winded enough this week; so I’ll leave it to you to…. ‘Ride Hard ! Ride Safe’

Henry & Andreas (HAT & Alpine Experience)

SPECIAL THIS WEEK:
Andreas’s special skiing summary from the Espace Killy (Val d’Isère & Tignes): “We keep getting some fresh snow to work with every other day and just the right amount to cover old tracks and give a new nice base but not so much so that it gets dramatically unstable so that we can’t move around safely. So this has meant great skiing lately with of course respect for new snow and also a lot of attention to timings and following temperatures etc! Our worst days now are when we get days with a few clouds and bad visibility but not any new snow, which means that we can neither ski powder comfortably, nor do we get a good spring snow transformation. So, we are touring a bit at the moment and we had a great mini tour with a night in the Col des Fourshut last weekend, 13-14 April, and despite Henry’s snoring which kept us all awake, we had a great time!!! So let’s hope the conditions stays good until the end and personally with the great base we have now, we should have lots more good skiing until the end of the season.”

PS We’re STILL doing lots of transceiver training at the moment in Val d’Isère: 35 euros for saisonaires for a full afternoon of coaching, timed searches, basic rescue procedures & a waterproof reference card (wow!). Call Jamie on 06 23 05 75 09

Snow report April 11

The skiing off-piste has been great lately despite totally unpredictable weather and days that you would think aren’t going to be good.. but then turn out to be great! Getting out early (despite wind, bad visibility etc.), going as high as possible and looking for slopes that are sheltered from the wind seems to be the trick [winds have been coming out of the Southwest to South most of the time up until the 11th – that will change on Saturday 12th as the winds turn to the North and Northwest for most of the time until Wednesday 16 April]. The little snowfalls of 5-10 cm that have been falling with each passing storm has helped to provide fresh tracks and lots of fun on a lot of days recently. Adding to the these little snowfalls is the wind, which has helped to make accumulations in sheltered areas build up to quite a bit more than what fell out of the sky - but not so much as to make it very unstable (so far anyway). It looks like this weather trend will continue for at least a week. So get out there and find the good snow!

Snowpack Quality & Stability

The light snowfalls and wind have been forming some surface slabs, mostly above 2500/2700 m. The wind, the sun, warming and precipitation will encourage some instability and avalanche activity on sufficiently steep slopes, a little at all altitudes. Below 2500/2700 a relatively small surface slab may turn into a larger wet snow avalanches; above, they could lead to bigger slab avalanche too as dry/cold snow slabs. The risk of these types of slabs will increase with each snowfall and I will be especially careful if we get 20 cm or more in one storm (or in a short amount of time like 48 hours) with wind, which can lead to twice the amount of snow that came out of the sky on sheltered slopes - the slopes that will have the best skiing..

Each day the Météo France avalanche forecast says that one skier is enough to trigger one of these surface slabs and that could even lead to a second slab releasing deeper into the snowpack below the first one. This scenario is what happened to my friend and colleague TJ last year – the conditions were not much different than now. TJ was lucky to get away with only severe knee injuries and is just getting back on skis now after several knee operations. So, even though things seem safe/stable in most places, there are areas of real instability out there. if you keep that in mind, you’re doing well.

Tip of the week:
I’m sticking to the higher and north’ish’ slopes for the best snow until we get some hot sunny days with good cold nights that will transform the snow on other slopes to nice smooth spring snow. I keep saying that I’ll do our annual spring snow write-up soon, but I’m going to have to put that off again until next week.. or until we actually start getting some good spring out there, but it looks like cold temperatures and more ‘mini snow storms’ through Wednesday 16 April. So I’m happy to stick with winter for now!

‘Ride Hard Ride Safe’!

Henry
Henry
PS We’re still doing lots of transceiver training at the moment in Val d’Isère: 35 euros for saisonaires for a full afternoon of coaching, timed searches, basic rescue procedures & a waterproof reference card (wow!). Call Jamie on 06 23 05 75 09

Avalanche bulletin and weather forecast Haute Savoie

This avalanche translation of the Meteo France avalanche bulletin is produced mainly through an automated translation tool.  Please use it in conjunction with the French bulletin found at the above link.

N74080411
SNOW AND AVALANCHE BULLETIN FOR HAUTE SAVOIE
(VALID OFF OF OPEN AND MARKED RUNS)
PREPARED ON TUESDAY APRIL 8
FOR WEDNESDAY 9 APRIL

ESTIMATE OF RISK UNTIL WEDNESDAY EVENING:
All massive Haute-Savoie:
Higher than 2000/2300 m: marked risk (level 3),
Lower than 2000/2300 m: limited risk (level 2).

WEATHER OVERVIEW UNTIL WEDNESDAY EVENING:
Time variable and sweet, a few light between clouds but reliefs responsible at times. There are triggered showers Wednesday afternoon. Limit rain / snow towards 2000/2200 m. Quantities in the high mountains 5 / 10 cm.
Isothermal 0 2000 2500 m.
Wind at 2000 m: Southwest 30 kph near the Mont Blanc, 50 km / h on Aravis / Chablais.
Wind at 4000 m: Southwest 70 km / h.

SNOW CONDITIONS:
Quite good. It is fitting the skis to 1200 m in cold northern slopes, 1600 meters in the South.
Quality of snow on Wednesday: on average mountains, the snow increases as a result of redoux and alternating light / clouds, and in the afternoon at the whim of rain. Above 2300/2500 m, there is a layer of 20/30 inches powder in areas sheltered from the wind of Southwest and snow worked in the exposed slopes.

STABILITY OF SNOW COVER:
Still slabs by places and of the purgings with the rise in temperature

Likelihood of spontaneous avalanches departure: redoux accelerates the decline but promotes departures Avalanche in the middle of steep mountains. By mid-day and afternoon, it is expected departure heavy snow surface, but generally not large enough to destabilize a skier. Watch for steep slopes north towards 2000/2300 m where the snow layer recent likely to be destabilized by the sweetness and rain showers in the afternoon. Risk of slab build on steep grassy guidance in South West in the afternoon to 1800/2200m.

The risk of an avalanche: brittle slabs persist in the snow surface fallen since the weekend. They are very rare and becoming stable, generally located near the peaks and sub slope failures, slopes north-west, north and east, higher than 2000/2300 m. Very locally, a group of hikers could trigger a rather large plate, it is better to keep the distances especially steep in the North region.

TREND FOR THURSDAY:
Stationary risk.

Meteo-France updates this newsletter everyday at 16h or sooner if conditions warrant nivométéorologiques.

Avalanche bulletin and weather forecast Haute Savoie

This avalanche translation of the Meteo France avalanche bulletin is produced mainly through an automated translation tool.  Please use it in conjunction with the French bulletin found at the above link.

N74060411
SNOW AND AVALANCHE BULLETIN FOR HAUTE SAVOIE
(VALID OFF OF OPEN AND MARKED RUNS)
PREPARED ON SUNDAY APRIL 6
FOR MONDAY 7 APRIL

ESTIMATE OF RISK UNTIL MONDAY EVENING:
All massive Haute-Savoie:
Limited risk (level 2).

WEATHER OVERVIEW UNTIL MONDAY EVENING:
The next night, restless time with snow / sleet and thunderstorm gusts. Layer expected to 2000 m 10/20 cm.
Monday quickly sunny and warm sun on average mountain.

Isothermal 0 2000 m.
Wind around 2000 m: Southwest 20/30 km / h.
Wind around 4000 m: West to southwest 100 km / h

SNOW CONDITIONS:
The snow is good, near normal for early April.
Departures skis or snowshoes to walk around 1200 m in northern slopes cold, in about 1600 m south.

Quality of snow for Monday:
A thin layer of snow and improperly filed becoming wet in the sun on a hard or brittle average mountains, sometimes on an old coat powder remained in the north higher than 2000 meters. In high mountain snow often wavy, powdery housed in the corners of high winds.

STABILITY OF SNOW COVER:
SOME SLABS WITH WORK AND NATURAL NO TRIVIAL.
The new slabs from the layer of the night, are expected to locate near the passes and peaks, and be modest in size but can be broken by the mere passage of a person. Some slabs, the oldest and coarse, are still in place higher than 2500 m in slope rather geared more towards the north and bars seracs in portions of corridors.
On Monday, castings and small avalanches of snow will trigger s'humidifiant (natural or caused by one person) in steep, moreover mixed. Activity probably more intense around mid-day. These flows remain modest in size but in certain situations topographic (corridor bottleneck, rock) the consequences could be amplified. Of therefore take into account the ground.

TREND LATER RISK:
Tuesday, windy and variable time, a level of risk stationary.

Meteo-France updates this newsletter everyday at 16h or sooner if conditions warrant nivométéorologiques.

Check out an Off-piste presentation in Cham

Good time to come and see 'Ride Hard ! Ride Safe' for more details see the promotion for the talk on the official chamonix web site www.chamonix.com

Avalanche bulletin and weather forecast Haute Savoie

This avalanche translation of the Meteo France avalanche bulletin is produced mainly through an automated translation tool.  Please use it in conjunction with the French bulletin found at the above link.

N74030411
SNOW AND AVALANCHE BULLETIN FOR HAUTE SAVOIE
(VALID OFF OF OPEN AND MARKED RUNS)
PREPARED ON THURSDAY APRIL 3
FOR FRIDAY APRIL 4

ESTIMATE OF RISK UNTIL FRIDAY EVENING:

All massive Haute-Savoie: limited risk (level 2).

WEATHER OVERVIEW UNTIL FRIDAY EVENING:
Dry weather, a few clouds to 1500 m in the early morning in the valleys, sunny in the mountains. In the afternoon, alternating sun and Cumulus spring. Temperature at 2000 m: -7 and -2 DG.
Isothermal 0 1200 1800 m.
Wind at 2000 m: North-east 30 km / h in the Mont Blanc, 40 km / h on Aravis / Chablais.
Wind at 4000 m: North-east 60 km / h.

SNOW CONDITIONS:
Well, close to the averages for early April. It is therefore fitting the ski slopes 1300 m in cold North, 1600 m in the South.
Quality of snow Thursday: snow surface increases and keeps a little skis below 2200 m in northern slopes and up to 2500 m in the South. At higher elevations, snow and cold is more lightly. In the high mountains and on the crests of Chablais, prone zones may be a bit compacted by Bise.

STABILITY OF SNOW COVER: rare slabs and castings

From Monday to Wednesday, it fell between 20 and 40 cm of snow in two stages. The snow surface is in the process of settling. It is based on sub-layers rather stable (with a few exceptions, particularly in areas of high altitude cold).

The risk of an avalanche: a few slabs were formed in the recent snow and with the north wind aloft. They are likely to break with the passage of a group of hikers, more rarely of one person. These slabs are mainly located near the peak and slope failures in North-West and East, especially above 2300 meters.

Likelihood of spontaneous departure Avalanche: After several hours of sunshine, small surface purges occur. Watch for steep oriented South-East, South and West, particularly in the sheltered sides of the Bise and under the cliffs where warming is more effective. These avalanches are limited for the most part to small cast, but a volume slightly higher could stall to 2000 m west in the afternoon.

TREND FOR SATURDAY:
The decline continues, but it should be expected to cast a little more gentle with the sun in April.
Meteo-France updates this newsletter every day to 16h or sooner if conditions warrant nivométéorologiques.

Still Snowing! Check out a presentation in Cham

Good time to come and see 'Ride Hard ! Ride Safe' for more details see the promotion for the talk on the official chamonix web site chamonix.com and check out a quick summary of what it is all about in this video: