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W7WXV > WX 25.12.22 08:31l 59 Lines 2135 Bytes #999 (0) @ WW
BID : 3830_W7WXV
Read: GUEST
Subj: Avalanche Fcst - Central Cascades, Oregon
Path: ON0AR<IW0QNL<SR1BSZ<EA2RCF<LU9DCE<KD6MTU<N5MDT<NJ3H<W7WXV
Sent: 221225/0619Z 3830@W7WXV.#COR.OR.USA.NOAM BPQ6.0.23
Backcountry Avalanche Forecast
Central Cascades
Issued
Saturday, December 24, 2022 - 9:14PM
Expires
Sunday, December 25, 2022 - 9:00PM
THE BOTTOM LINE
Avalanches will be possible on Sunday due to warm temperatures and rainfall.
Avalanches will be possible on all elevations and aspects throughout our
forecasting zone. Consider avoiding terrain above 30 degrees and avoiding
exposure to large slopes overhead.
Avalanche Danger
Sunday, December 25, 2022
Above Treeline 2 - Moderate
Near Treeline 2 - Moderate
Below Treeline 2 - Moderate
Avalanche Problem #1
With rain forecasted tonight and tomorrow, wet slabs will continue to be
possible. The snow level will be around 8,000ft and rise to 9,000ft in the
afternoon. Look for signs of natural avalanches, and consider digging into the
snowpack to see the depth of the recent rain percolation and/or saturated snow.
Avoid any terrain where you suspect wet slab activity, and give yourself plenty
of distance from large, steep overhead terrain.
We still have the Dec 8th buried surface hoar down 40-60cm and other patchy weak
layers in the upper snowpack. Overall these have been non-reactive. However, if
the rain reaches these layers, they may become reactive.
Wet slabs form when water from rain and/or warming percolates and pools under a
slab, especially at a weak layer. This can weaken the bonds of snow and release
an avalanche. Wet slabs can be very destructive.
Avalanche Problem #2
New snow high in the alpine is possible for Sunday. If you travel above 8,000ft
you might encounted fresh wind slabs on lee terrain. Look for visual clues such
as wind transport at ridgelines, deeper drifts of snow, and smooth texture
surfaces. Consider avoiding wind loaded slopes, and be observant of terrain
traps below.
Forecast Discussion
On Saturday I found the snow surface to have rain runnels and the upper 10cm (4
inches) of the snow to be wet and saturated at 6,900ft. Rain started around noon
and progressively became heavier as the afternoon continued. I found the
snowpack to be between 100-150cm in the Todd Ridge area.
NNNN
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