Snowpack Summary published on April 9, 2018 @ 8:39 am
Issued by Ryan Lewthwaite -

bottom line:

The conditions in the BWRA have deteriorated with the rains on 4/6 & 4/7. Wet Slab & Wet Loose avalanches have occurred with this storm. Elevations below 9K' will be icy this morning, while above 9K' unconsolidated Loose wet snow conditions exist. Expect increased Loose wet activity this afternoon with temperatures projected to be 8F degrees above normal. Many areas of the BWRA have become inaccessible due to creeks flooding & the loss of crossings.

Avalanche Character 1: Loose Wet
Loose Wet avalanches occur when water is running through the snowpack, and release at or below the trigger point. Avoid very steep slopes and terrain traps such as cliffs, gullies, or tree wells. Exit avalanche terrain when you see pinwheels, roller balls, a slushy surface, or during rain-on-snow events.

Temperatures could be 8F degrees above normal today with intense sun. The slopes that haven't avalanched from Wet Loose/ Slab activity recently could see movement this afternoon. Leavitt Snotel reports a 6AM temperature of 38F degrees, resulting from a Strong Inversion. The Sonora Snotel is reading 29F degrees. Icy conditions below 9K' will give way to unsupportable slush as you approach near treeline areas. Travel will be very unpredictable as creek areas have washed away crossings. Caution is required during morning refreeze in some areas, as slide-for-life conditions exist.

Snowpack Discussion

Highly Variable Snowpack Conditions! Inversions this morning could intensify the Loose Wet avalanche activity in areas above 9K'. Icy surface snow below 9K' will increase travel risk. Rain & saturated snow have created Wet Slab avalanches (R2D2) on some N-NE-E aspects in all elevations. Surface melt-freeze crusts & unconsolidated snow will be encountered today. Snow around objects & above creeks will be hollow, watch out for tree-wells & creek crossings.

recent observations

The weather on 4/6 into the morning of 4/7 was unfavorable. Rain was falling at all elevations & has effected the snow in dramatic ways. Wet Slabs have pulled away from the hillsides sending long swaths of debris into runout zones. Creeks have overflowed with mud & quick intense rains washing away many crossings. Leavitt Lake has become inaccessible due to Deadman Creeks canyon walls, refer to 4/8 observation.

CURRENT CONDITIONS Weather observations from Sonora Pass
0600 temperature: 29 deg. F.
Max. temperature in the last 24 hours: 48 deg. F.
Average wind direction during the last 24 hours:
Average wind speed during the last 24 hours: mph
Maximum wind gust in the last 24 hours: mph
New snowfall in the last 24 hours: 0 inches
Total snow depth: 48 inches

Sunny & warm today with temperatures reaching mid 50's. Winds will be light today. This evening we will see the clouds & winds increase as we welcome another storm. Winds will be strong & gusts could reach 90 mph. WIND WARNING from 2PM Tuesday 4/10 until 11PM Wednesday 4/11. The storm duration looks short with quick bursts of rain, possibly high elevation snow, in small amounts. Winds look to continue through the weekend with a winter storm likely for Wednesday night.

Two-Day Mountain Weather Forecast Produced in partnership with the Reno NWS
For 8000 ft. to 10000 ft.
  Monday Monday Night Tuesday
Weather: Sunny Clear becoming partly cloudy late. Mostly cloudy.
Temperatures: 55 to 63 deg. F. 34 to 39 deg. F. 49 to 59 deg. F.
Wind direction: Light winds Southwest South to Southwest WIND WARNING
Wind speed: Light winds; gusts to 20 mph early 10 to 15 mph; gusts to 35 mph late 15 to 20 mph; gusts to 45 mph increasing to 20 to 35 mph; gusts to 65 mph later
Expected snowfall: 0 in. 0 in. 0 in.
For above 10000 ft.
  Monday Monday Night Tuesday
Weather: Sunny Partly cloudy Mostly cloudy
Temperatures: 50 to 56 deg. F. 29 to 35 deg. F. 43 to 49 deg. F.
Wind direction: Northeast Southwest Southwest WIND WARNING
Wind speed: 10 to 15 mph; gusts to 25 mph becoming light 10 to 15 mph; gusts to 25 mph increasing to 20 to 30 mph; gusts to 45 mph late 30 to 50 mph; gusts to 75 mph increasing to 45 to 65 mph; gusts to 95 mph later
Expected snowfall: 0 in. 0 in. 0 in.

This snowpack summary applies only to backcountry areas in the Bridgeport Winter Recreation Area. Click here for a map of the area. This snowpack summary describes general avalanche conditions and local variations always occur. This snowpack summary expires in 48 hours unless otherwise noted. The information in this snowpack summary is provided by the USDA Forest Service who is solely responsible for its content.