Observation: Rock Canyon

Observation Date
4/6/2023
Observer Name
Dave Jarvis
Region
Provo » Rock Canyon
Location Name or Route
Rock Canyon
Red Flags
Red Flags
Recent Avalanches
Heavy Snowfall
Rapid Warming
Avalanche Problem #1
Problem
New Snow
Trend
Increasing Danger
Problem #1 Comments
Today, Thursday 4-6-23 it was clear all day, cold in the morning, with solar warming as the day progressed. I was fairly surprised at how much new snow there was. In places I could punch a leg 26" deep. I could find surface Sun-crusts in some areas, but not in others. I spent over an hour digging out the up-slope of the narrow dugway north of Second Right Hand Overlook. There had been at least 2 people step off the edge lately. There would be around 20" of dry powder on top. A wide section of 'quiet' facets. Then about a yard deep I found some large damp facets.
Higher slopes are well loaded. At least on Thursday morning it was squeeky-snow cold and most of the new pack was cold, dry, and unconsolidated. There were areas of dry sluffs on the east side of Squaw Peak and Y Mountan from Wednesday. The open area just East of Hale Draw had heated up enough on Wednesday that it triggered and slid. North aspect, shallow, with a yard+ of Mashed Potato debris at the base of the slope. (120' from the trail)
Avalanche Problem #2
Problem
Wet Snow
Trend
Increasing Danger
Problem #2 Comments
Rapid Warming, Trigger Run, Repeat.
While I was working on the dugway, I heard the first avalanche run down the West Branch of the Crows Foot Couloir. (at 11:50 am) It was triggered by heating but still fairly dry. It repeated over 10 times in the next couple of hours. At some point the Grr Couloir ran lower. I saw a minor repeat later.
I had a needed snack at the West Campground. Then spent some time packing 150' of the trail East. Things started hoppin'. The open patch East of the Campground avalanched, shallow & dry. (map pin) It widened out to 200' and swept to the bottom. The cascades on the steep cliffs East & North started triggering with the afternoon warming. I lost count,, a bunch. One fanned out off a 200' cliff. Then a larger rumbler shot out in profile with darker gray. (usually larger ice facets) The next 45 minutes I saw or heard one cascade after another. Most notably on the West Southwest aspect. And silence to the South from Provo Peak's NW flank.
Eventually it was time to bug out. As I dropped lower the signs of afternoon warming increased. The dugway slope formed some very large pinwheels. A pair on skis would kick up some damp snow when they cut into the pack next
to the trail. Some steep north aspects had fresh rollers. I watched a cluster of rollers coming down Hale Draw.
With the increasing temperatures the next four days, I'll probably head somewhere without overhead concerns this weekend.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Considerable
Coordinates