Rapid temperature rise
Thu, Mar 26, 2020 - 3:44 PM
Three Sisters Area / 7542'
Snowmobile Ski or Snowboard
Few (1/8 - 2/8)
Today I toured around the Bowl of Broken Top. Around 9am in the morning at the Broken Top trail head temps where quite cool, around -5c (23f), winds where light from the south east, good visibility and no precipitation. Skinning into the bowl the snow surface was a widespread 5 - 15cm (2-6")of dry loose snow. I was able to find some isolated patches of a breakable melt freeze crust on solar aspects. See pic.
Temps rose quite rapidly through the morning. At the top of "Little Pucker Up" by 11am the snow surface was starting to become moist. There was no blowing snow the ridges, I did not see any wind slab formation on that west aspect. Ski Cutting did not produce any results as the new snow was well bonded to the old snow surface.
In the Bowl there was lots of evidence of small wet loose slides from the day before. Lots of pin wheels. "High Noon" couloir had the greatest amount of activity, with two small crowns, perhaps from entrained melt freeze crusts.
Clouds increased gradually throughout the day, by the time I was leaving at 2pm, air temp was -2c (29f) and the snow was noticeably heavier.