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Turnagain Area Avalanche Advisory
Saturday, April 3rd 2010 6:40 am by CNFAIC Staff
ARCHIVED ADVISORY - All advisories expire after 24 hours from the posting date/time.
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BROUGHT TO YOU BY
The Bottom Line
Good morning backcountry travelers this is Carl Skustad with the Chugach National Forest Avalanche Information Center on Saturday April 3rd, 2010 at 7 am. This will serve as a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area (this advisory does not apply to highways, railroads, or operating ski areas).

ANNOUNCEMENTS
A Big thanks to the Friends Group,the Alyeska Resort, and all of you that volunteered and participated in last weekends Telepalooza AK fundraiser. Your support makes this advisory possible.

Skookum Valley and Skookum Glacier are closed to motorized vehicles (snowmachines, helicopters, ATVs) except for subsistence uses.. This closure is directed in the current Chugach National Forest Land and Resource Management Plan. Placer River Drainage remains open for motorized use to Spencer Glacier.

WEATHER ROUNDUP
Lisa just tallied the March weather chart and came up with a nice snowy outcome. 152\" of snowfall, 15\" snow water equivalent and 5 storms over 15\". This puts our Turnagain snowpack at roughly 124% of normal.
As for current weather, no new snow in the past 48 hours and limited chance of precip today. The satellite images show scattered cloud cover and the radar is mostly clear. Winds have been light with moderate gusts on Sunburst yesterday afternoon. Temperatures peaked yesterday at 5pm reaching 45 at sea level and 34 at 3200 ft on Max\'s. Sunburst Ridge reached 28 deg F.

AVALANCHE DISCUSSION
Today's avalanche danger is MODERATE with pockets of CONSIDERABLE this afternoon due to a complex snowpack consisting of buried weak layers of surface hoar and suncrusts. Afternoon sun and buried surface hoar will be the primary avalanche hazards today.

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully. Natural avalanche unlikely this morning, natural avalanches possible this afternnon. Human triggered avalanches possible and likely in pocketed areas. If an avalanche is triggered it could go very large. 3 ft of new snow in the last week on top of buried surface hoar will promote large propagation and dangerous sized avalanches.

El Presidente Repetto found a yellow light snowpack on Sunburst Mt yesterday (CT22Q2) under 41 inches of snow. That weak layer is one week old and consists of a suncrust on south aspects and surface hoar on north aspects.

Areas where one could likely trigger an avalanche today exist on steep rollovers or hanging snow fields near ridgetops. Wind slabs will be present in the alpine. All aspects have either buried surface hoar (north aspects) or buried sun crusts (south aspects). These weak layers have cross over and duplication on east and west aspects.

The sun is a critical "watch out" situation this time of year. Avalanche danger increases quickly during periods of rapid warming temperatures and direct sunlight.

CNFAIC Staff than sunny slopes, the buried surface hoar is a serious concern today. We did record some natural avalanche activity that occured 24 to 48 hours ago. The SW aspects of Tin Can Common, Sunburst, and Magnum. The N aspects of Tin Can "Todd", Petes South, and Petes Peak. Many point release and loose snow avalanches were noticed yesterday afternoon.

Terrain management is the key today. Keep your slope angles below 35 degrees. AVOID traveling on sunny slopes IF the sun comes out and get out of avalanche terrain immediately if it does. Remember that most of the avalanches that failed on the surface hoar have occurred on northern aspects.

Glide cracks are secondary concern today. These crevasse like features are those cracks that go all the way to the ground. Avoid traveling underneath these cracks. A full depth climax avalanche occurred on lower Goat Ridge in Girdwood Valley on 3/30/2010.


WEATHER FORECAST (National Weather Service)
WESTERN PRINCE WILLIAM SOUND-
INCLUDING...WHITTIER...SEWARD...GIRDWOOD...MOOSE PASS
500 AM AKDT SAT APR 3 2010

.TODAY...MOSTLY CLOUDY. HIGHS IN THE LOWER TO MID 40S. LIGHT
WINDS.
.TONIGHT...MOSTLY CLOUDY WITH SCATTERED SNOW SHOWERS. LOWS IN THE
UPPER 20S TO MID 30S. VARIABLE WIND TO 10 MPH.
.SUNDAY...NUMEROUS SNOW AND RAIN SHOWERS. SNOW ACCUMULATION UP TO
3 INCHES ABOVE 1000 FT ELEVATION. HIGHS IN THE MID 30S TO MID 40S.
EAST WIND 20 TO 30 MPH.
.SUNDAY NIGHT...NUMEROUS SNOW SHOWERS. LOWS IN THE MID 20S TO
LOWER 30S. EAST WIND 20 TO 35 MPH.
.MONDAY...MOSTLY CLOUDY WITH SCATTERED SNOW SHOWERS. HIGHS IN THE
MID 30S TO LOWER 40S. EAST WIND 10 TO 25 MPH.
.MONDAY NIGHT...MOSTLY CLOUDY WITH SCATTERED SNOW SHOWERS. LOWS
25 TO 35.

TEMPERATURE / PRECIPITATION

SEWARD 45 33 44 / 0 50 60
GIRDWOOD 44 27 43 / 0 30 40


WEATHER STATION SUMMARY for last 24 hours at TURNAGAIN PASS
3800�-Sunburst Wx Station
Temp (5am): 25 (no change from yesterday morning)
Winds: current east winds are light, yesterday saw moderate easterly winds.

2600�-Seattle Ridge Wx Station
Temp (5am): 26 (no change)
Winds: current southwest winds are light, yesterday saw light southeast winds.

1800�-Center Ridge Wx Station
Temp (5am): 27(1 degrees warmer than yesterday morning)
Precip: 0 new snow, total snowpack is 141 after 5 inches of settlement.

Thanks for checking today's avalanche advisory. Lisa will update this advisory tomorrow Sunday April 4th, 2010 by 0700.

 Show the Complete North American Avalanche Danger Scale
2 Moderate Alpine / Above 2,500' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
2 Moderate Treeline / 1,000'-2,500' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
2 Moderate Below Treeline / Below 1,000' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area (this advisory does not apply to highways, railroads, or operating ski areas).

Winter snowmachine use open/closed status and riding conditions updates

Riding status is not associated with avalanche danger. An area will be open to motorized use in accordance to the Forest Management Plan when snow coverage is adequate to protect underlying vegetation. Backcountry hazards including avalanche hazard are always present regardless of the open status of motorized use areas.

(Updated: Jan 13, 2019 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: Open
Placer River: Open
Skookum Drainage: Open
Turnagain Pass: Open
Twentymile: ClosedClosed. Forest Service is monitoring conditions.
Seward District
Carter Lake: Open
Lost Lake Trail: OpenPlease stay on trail to avoid resource damage through forested areas.
Primrose Trail: OpenPlease stay on trail to avoid resource damage through forested areas.
Resurrection Pass Trail: ClosedClosed for the 2018/19 season. Next season will be open to motorized use.
Snug Harbor: Open
South Fork Snow River Corridor: Open
Summit Lake: Open

Subscribe to the Turnagain Area Avalanche Advisory:

The information in this advisory is from the U.S. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur. This advisory provided by the Chugach National Forest, in partnership with Friends of the Chugach National Forest Avalanche Information Center.


USFS SNOW AND AVALANCHE HOTLINE (907) 754-2369
If you have comments or questions regarding CNFAIC operations or winter recreation management, please email staff@chugachavalanche.org
© 2019 Chugach National Forest Avalanche Information Center. All rights reserved.
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