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Turnagain Area Avalanche Advisory
Saturday, January 9th 2010 7:00 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 January 9th 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).

WEATHER ROUNDUP

3800 -Sunburst Wx Station-Turnagain Pass
29 deg F, winds are averaging 16-17 with gusts 23-26 out of the E

2400-Seattle Ridge Wx Station-Turnagain Pass
winds averaging 11-14 with gusts 17-22 out of the E

1800-Center Ridge Wx Station-Turnagain Pass
Precip: 0 inches of water and 0 new snow
Total depth of 56 inches
Temperatures ranged from 32-36 degrees F, current temp is 35

Summit Lake
Precip: 0 inches of water and 0 new snow
Total depth of 29 inches
Temperatures ranged from 23-33 degrees F, current temp is 31.6

3440' - Fresno Ridge - Summit Lake Area
30.6 deg F, winds averaging 12-23 with gusts to 33 mph out of the WSW



Weather Forecast
AKZ125-100100-
WESTERN PRINCE WILLIAM SOUND-
INCLUDING...WHITTIER...SEWARD...GIRDWOOD...MOOSE PASS
500 AM AKST SAT JAN 9 2010

.TODAY...RAIN AND SNOW SHOWERS DIMINISHING THIS AFTERNOON.
CNFAIC StaffWISE...MOSTLY CLOUDY. SNOW ACCUMULATION 1 INCH OR LESS. HIGHS IN
UPPER 20S TO LOWER 40S...COLDEST INLAND. VARIABLE WIND TO 15 MPH.
NEAR SEWARD...NORTH WIND 10 TO 25 MPH.
.TONIGHT...SCATTERED RAIN AND SNOW SHOWERS IN THE EVENING.
CNFAIC StaffWISE...DECREASING CLOUDS. LOWS IN THE LOWER TEENS TO LOWER
30S... COLDEST INLAND. LIGHT WINDS EXCEPT NORTH TO 30 MPH NEAR
SEWARD.
.SUNDAY...MOSTLY SUNNY. HIGHS IN THE LOWER 20S TO MID 30S...
COLDEST INLAND. LIGHT WINDS EXCEPT NORTH 30 MPH NEAR SEWARD AND WEST
20 MPH NEAR WHITTIER.
.SUNDAY NIGHT...PARTLY CLOUDY WITH A SLIGHT CHANCE OF SNOW. LOWS
5 TO 25 ABOVE...COLDEST INLAND. LIGHT WINDS EXCEPT NORTH 30 MPH NEAR
SEWARD AND WEST 20 MPH NEAR WHITTIER.
.MONDAY...MOSTLY CLOUDY WITH A SLIGHT CHANCE OF SNOW. HIGHS IN
THE UPPER 20S TO MID 30S. VARIABLE WIND 10 MPH EXCEPT NORTH 10 TO
25 MPH NEAR SEWARD.

TEMPERATURE / PRECIPITATION

SEWARD 35 28 33 / 70 20 0
GIRDWOOD 29 16 25 / 40 0 0

The radar and satellite show clear skies currently. The Middleton radar has a large band of precipitation heading our way for mid day. This was a similar setup yesterday and skies remained clear and sunny over our advisory area. A 5 degree F inversion is in place over the Girdwood Valley this morning and a slight 1 degree inversion over Summit Lake.


AVALANCHE DISCUSSION

Todays avalanche danger will remain at MODERATE in the alpine above 2500ft. MODERATE is defined as: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern. Natural avalanches unlikely (except glide cracks are possible) and human triggered avalanches possible. Small avalanches in specific areas; or large avalanches in isolated areas.

Below 2500 ft the avalanche danger is LOW. Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Jon and I got some good observations from Turnagain Pass yesterday. The rain line looks like it made it up to 3000 feet. Our pit at 3400 ft still had a slight crust on the snow surface but not from true rain (see pit in photo gallery). A band of elevation is present from 2600 to 2800 ft that had rain on dry snow. In CNFAIC Staff words the Wednesday rain pushed past the previous rain line of 2000 ft up to 3000 ft. Not good for snow quality or future avalanche stability. You can't miss this elevation, there are roller balls the size of bowling balls all over it. Roller balls are snow balls, that form when rain hits dry snow, and role down the hill. The skiing was good from 3600 to 2600 ft then it got a little challenging. If you thought last weeks boiler plate crust was hard wait till you ski, ride , or snowmachine the current teeth rattling nar below 2000 ft. Watch your sled for overheating!

The alpine continues to show an instability 6-12 inches under the snows surface. We have consistently seen this layer from T-Pass through the Summit Lake area. Upon closer evaluation I found decomposing stelar and old faceted crystals responsible for this weak layer. It has only been failing in our stability test and has not been responsive to skis, boards, or snowgos. This is; however, my main layer of concern. Alex reported finding some buried surface hoar mixed in this layer near Summit Lake yesterday.

No naturally or human triggered avalanches of concern were noticed in Turnagain Pass yesterday. Alex reported some natural avalanche activity occurred Wednesday during the rain event. He points out that travelers in the Summit Lake area may find wind sensitive wind slabs on southern aspects.

Always remember that safe backcountry travel requires training and experience. You control your own risk by choosing where, when, and how you travel.

Thanks for checking todays avalanche advisory. The next one will be posted tomorrow Sunday, January 10th.

 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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