Wind Slabs
- All elevations
- Likelihood
- Possible
- Size
- 1.5
Wind slab will develop over the day. Avalanching is possible at the mid elevations where the new snow is falling on a pretty slick raincrust.
After a long clear period of more than a week there is snow from the west forecast down to about 1400m over Friday.
Over Friday enough snow should fall over the day to have possible small slab avalanches at the mid elevations, where the snow will land on the solid raincrust. Watch out for small windslabs on steep slopes lee to the westerly winds.
Unusually the higher elevation should be safer. Watch for any small pockets of wind slab which may remain at the very high elevations.
Wind slab will develop over the day. Avalanching is possible at the mid elevations where the new snow is falling on a pretty slick raincrust.
Wed 13 Aug - A series of avalanching (unsure of type) off Mt Talbot observed in the afternoon.
Tuesday 12 Aug - Loose wet activity observed on all sunny aspects throughout the Darran Mountains
Sun 9th Aug- Some wet loose activity reported during rain in the Gertrude Valley area.
Post the 17th- Clear and calm with snow settling and strengthening.
Summary for week 12th-17th August
Over the 12-13th Aug around 45mm fell as snow (25cm) down to around 2000m with rain below that. The second half of the week had a sustained southerly flow with a low FAFL, down to 700m, with no precip. The FAFL is slowly rising now.
The snowpack is expected to be wet and refrozen below 1900/2000m. Above this the mid-pack may have layers, but the upper pack may be wet and refrozen. There may be a dry layered snowpack on the highest peaks, especially on the southerly half.
Fri 7th to Sun 9th. Up to 25cm fell above about 1700m in northern Fiordland. Expect some slab development in the steep ground near ridgetops. Below about 1700m expect a lattice of rain crusts or even rain-soaked snow at the very low elevations.
The weekend's storm starts on Friday morning.
A refreeze of the wet snowpack has taken place, to high elevations, on all aspects. Take an axe and crampons if you're exploring.
Moderate
New Zealand Avalanche Advisory (NZ Mountain Safety Council)