New Zealand · 12.09.2026

Two Thumbs

Level 1: 1800 m–and above · Level 1: 1200 m–1800 m

Low

Danger level

1 — Low

Snowpack stability

The snowpack is well bonded and stable in general.

Likelihood of triggering

Triggering is generally possible only from high additional loads in isolated areas of very steep, extreme terrain. Only small and medium natural avalanches are possible.

Avalanche problems

Wet snow
The avalanche problem is related to a weakening of the snowpack due to the presence of liquid water. Water infiltrates the snowpack due to melt or rain.
Good timing and trip planning are important. Consider avalanche runout zones.
Affected aspects
WestNorthwestNorthNortheastEast
Wind slab
Wind slabs are formed when loose snow in near-surface layers (new snow or old snow) is transported and deposited by wind.
Avoid wind-drifted deposits in steep terrain.
Affected aspects
NorthwestNorthNortheastEastSoutheast

Stability

Surface Snow Conditions: Around 10cm of new snow fell on Thursday morning. This has been distributed by gale south westerly winds on Friday. Exposed areas are stripped back to previous crusts and sheltered areas are wind loaded. Snowpack Structure: Previous Base: any remaining snow sits on hard/textured crusts over a moist base or bare ground. Several melt-freeze and ice layers with currently none-reactive weaker snow in between them still exist above 1800m. Total Depth: Generally 40–75 cm, reaching 100–120 cm in sheltered spots. Pictures from Camp Stream area from Thursday (9 Sep).

Snow quality

A few small (size 1) avalanches were observed at approx 2000m on a SE aspect. They appeared to be windslabs, it is unsure when they ran, but probably around the 10th. If you see any activity on the Two Thumb Range, please make a public observation. It helps us to produce accurate forecasts.

Weather

Mainly fine with morning frosts and some evening cloud.Wind at 1000 metresWesterly gale 75 km/h, easing to southwesterly 30 km/h in the morning, then dying out in the afternoon.Wind at 2000 metresSouthwesterly severe gale 90 km/h, easing to 40 km/h in the morning.Freezing level1700 metres, lifting to 2000 metres in the afternoon.

European Avalanche Danger Scale

Official scale used by European avalanche warning services.

5 — Very high
Snowpack stability
The snowpack is poorly bonded and largely unstable in general.
Likelihood of triggering
Numerous very large and often extremely large natural avalanches can be expected, even in moderately steep terrain.
4 — High
Snowpack stability
The snowpack is poorly bonded on most steep slopes.
Likelihood of triggering
Triggering is likely, even from low additional loads, on many steep slopes. In some cases, numerous large and often very large natural avalanches can be expected.
3 — Considerable
Snowpack stability
The snowpack is moderately to poorly bonded on many steep slopes.
Likelihood of triggering
Triggering is possible, even from low additional loads, particularly on the indicated steep slopes. In certain situations some large, and in isolated cases very large natural avalanches are possible.
2 — Moderate
Snowpack stability
The snowpack is only moderately well bonded on some steep slopes; otherwise well bonded in general.
Likelihood of triggering
Triggering is possible, primarily from high additional loads, particularly on the indicated steep slopes. Very large natural avalanches are unlikely.
1 — Low
Snowpack stability
The snowpack is well bonded and stable in general.
Likelihood of triggering
Triggering is generally possible only from high additional loads in isolated areas of very steep, extreme terrain. Only small and medium natural avalanches are possible.

Avalanche problems

Typical problem types defined by EAWS.

New snow
The avalanche problem is related to current or most recent snowfall. The amount of additional loading by new snow onto the existing snowpack is the crucial factor of the new snow problem. How critical the loading is, depends on various factors such as air temperature, wind or characteristics of the old snow surface.
Wind slab
Wind slabs are formed when loose snow in near-surface layers (new snow or old snow) is transported and deposited by wind.
Persistent weak layers
The avalanche problem is related to the presence of one or more persistent weak layers in the old snowpack. These weak layers typically include faceted crystals, depth hoar or surface hoar crystals.
Wet snow
The avalanche problem is related to a weakening of the snowpack due to the presence of liquid water. Water infiltrates the snowpack due to melt or rain.
Gliding snow
The entire snowpack is gliding on the ground, typically on smooth ground such as grassy slopes or smooth rock zones. High activity of glide-snow avalanches is typically related to a thick snowpack with no or only few weak layers. Glide-snow avalanches can occur both with a cold dry snowpack and with a warm moist or wet snowpack. The release of a glide-snow avalanche is difficult to predict, although in many cases glide cracks open prior to release.
Cornices
A wave-like formation of soft or hard wind drifted snow, often overhanging.