Avalanche Forecast

High - ample field data and confidence in weather forecast models.

Identify lee and cross-loaded features and approach with caution. Be cautious as you transition into areas of wind affected terrain. Avoid steep slopes below cornices.

Avalanche control team reports from Mount Washington indicate some activity with control teams ski cutting small size one avalanches on steep isolated north aspects. These avalanches where wind slab on cross loaded features in open terrain at tree line. Failing on the exposed melt freeze crust, easily trigger and sensitive to human triggering.

Variable surface conditions exist dependent on exposure to the wind. On open and exposed terrain, the majority is scoured to melt freeze crust. Areas protected from the wind have up to 50 cm of low density unconsolidated snow sitting on the melt freeze crust. Past moderate to strong wind from all directions with the last big wind event coming from the south west have transported a large amount of available low density snow. Numerous snow pack test have produced easy results failing on or just above the melt freeze crust initially buried on February 14. Observers have reported easy sudden planar results on compression tests and while travelling in avalanche terrain have experienced easily heard and felt snow pack settlements. The valentines day crust can be found down between 20 and 60 cm and the crust can be up to 80 cm thick. Below the crust well settled and strengthening snow

Cool conditions persisted with overnight lows below minus 10 and up to 20 cm of new snowfall. Winds continued from the north west with variable velocity ranging from light to strong. Overnight on Saturday strong south west wind transported available new and low density snow to north aspects.Sunday afternoon gave way to a variety of conditions including clear sky with sun, convective snow showers, graupel and or hail. On solar aspect and at lower elevation surface snow became moist with even the slightest touch of sun.

A strengthening low approaches the island region late Wednesday into Thursday bringing to the forecast area strong south east wind and moderate to heavy snowfall. Monday: 1 to 5 cm new snowfall. Temperatures - 10 overnight rising to 0 mid day, winds light to moderate south west. Freezing level 0 m rising to 800 m mid day. Tuesday: 1 to 5 cm new snowfall. Temperatures -3 overnight rising to near 0 by mid day, winds moderate west. Freezing level 500 m rising to 800 m mid day. Wednesday: 25 to 40 cm new snowfall. temperatures -5 rising to -1 mid day, winds Strong South East . Freezing level 250 m rising to 500 m mid day.