Slick surface conditions and sliding hazard remain the primary concern. An icy rime surface exists above 1600 metres elevation, mostly on south-facing slopes. A loose wet avalanche problem may develop on sun-affected slopes. The weather is becoming settled over the next 24 hours. Clear conditions at times with light to moderate westerly winds over the next 24 hours.
Loose wet avalanche activity on sun-affected slopes during the warmest period of the day is possible. The surface structure will be reduced by solar radiation. High freezing levels and a warm snowpack will also increase the chance of structural breakdown of the surface snow. Be alert to signs such as increased foot and ski penetration and roller ball activity.
No human or naturally triggered avalanches have been reported or observed over the past 24 hours.
Impenetrable rime surface formations are the primary feature of the snowpack currently. This surface deposit is dangerous and unforgiving. The rime formations will be resistant to rain saturation or even solar effect and may take time to break down. The snowpack is wet after recent light rain and will refreeze if freezing levels are lower. Rain over the past few days has lifted the snow line and eroded the snowpack. The current snowline is approximately 1600 metres in elevation, with an estimated threshold slightly higher at around 1700 metres. This threshold indicates the minimum snow cover to cover bed surface irregularities, where avalanches can run free.
Friday, the 17th of July, will be mostly cloudy, with isolated light showers about the southern and western faces. The winds will be light to moderate south-westerly, tending westerly at times. The freezing level is about 2800 metres. A weak front over central New Zealand and another front over the South Island both move northeast over the country and weaken today, followed by southwesterlies. Tomorrow, a ridge of high pressure covers much of the North Island while a westerly flow affects the South Island.
Rime crust on southern aspects is slick, hard, and unforgiving. These types of conditions demand a high level of skill and competency. The consequences of a fall and slide will be severe. Plenty of hazards, such as exposed rocks and cliff bands, exist. It is essential to carry the appropriate gear, crampons, and an ice axe. Taranaki has a high exposure to weather features from multiple directions. Snowpack and surface conditions reflect this in a unique and volatile way. Rime events, rain events are frequent. The rime ice can be robust and impenetrable; even an experienced climber will find the conditions challenging. Read surface conditions and make decisions early; avoid complacency.
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New Zealand Avalanche Advisory (NZ Mountain Safety Council)
