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Turnagain Area Avalanche Advisory
Friday, February 26th 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 Friday, February 26th 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
We saw snow move through the area yesterday from the west. This track gives the Anchorage bowl a better chance of snow as was the case. The advisory area received 6" in Girdwood, 5" at Eddies, 6" at the Turnagain Pass motorized lot, 7" at Sunburst, 5" inches at Johnson Pass TH north, and 5" at Summit Lake. Temperatures have dropped off again this morning ranging from 25 at sea level to 10 degrees F at 3600 ft. Winds also dropped off after 6pm last night. Current winds are light with moderate gust in the single digits. We did see a period of wind yesterday afternoon with gusts in the 30's out of the west. This may have been enough to create small isolated wind slabs above tree line. The wind direction has been variable over the last 48 hours as the jet stream fluctuates. Westerly winds were present as the latest system moved across our area.

The radar shows a snow shower moving north over Anchorage this morning, all CNFAIC Staff areas are clear. The satellite shows clouds moving in from the southwest.

AVALANCHE DISCUSSION
Todays avalanche danger is MODERATE. Natural avalanches unlikely, human-triggered avalanches possible. You may see small solar induced point releases this afternoon if direct sun is present. Cooler temps should keep this chance to a minimum. Human triggered avalanches should be limited to new snow instabilities. Wind slabs of 6 inches to a foot may be possible in the alpine. Areas to find these wind slabs include: steep rollovers, leeward ridges, and side loaded ribs.

We have still found remnants of the old weak layers of concern. Those are the rain crust from January 7th and the buried layer of surface hoar from earlier February. These layers have not been reactive and in many areas got destroyed during last weeks siege. I mention them as a reminder to keep an eye out for them. We would love to hear from you if you see these layers in the snowpack.

Glide cracks and cornices continue to be areas of concern today. Both are total wild cards and are very difficult to predict. We have seen increased failures of both cornices and glide cracks this week. Give them lots of space. Avoid traveling underneath, along the side, above, or anywhere near glide cracks or cornices today.

WEATHER FORECAST (National Weather Service)
WESTERN PRINCE WILLIAM SOUND-
INCLUDING...WHITTIER...SEWARD...GIRDWOOD...MOOSE PASS
500 AM AKST FRI FEB 26 2010

.TODAY...CLOUDY ALONG TURNAGAIN ARM THIS MORNING...CNFAIC StaffWISE
SUNNY. HIGHS IN THE MID 20S TO LOWER 30S. VARIABLE WIND 10 MPH.
NORTH AND WEST WIND 15 TO 30 MPH NEAR SEWARD AND WHITTIER WITH
GUSTS TO 40 MPH NEAR WHITTIER.
.TONIGHT...MOSTLY CLEAR. LOWS 5 TO 20 ABOVE...COLDEST INLAND.
LIGHT WINDS. NORTH AND WEST WIND 10 TO 25 MPH NEAR SEWARD AND
WHITTIER...BECOMING LIGHT AFTER MIDNIGHT.
.SATURDAY...PARTLY CLOUDY IN THE MORNING...THEN MOSTLY CLOUDY
WITH A CHANCE OF SNOW IN THE AFTERNOON. HIGHS IN THE 20S.
NORTH TO EAST WIND TO 15 MPH.
.SATURDAY NIGHT...SNOW LIKELY. LOWS IN THE 20S. NORTH TO EAST
WIND 10 TO 20 MPH EXCEPT EAST WIND INCREASING TO 20 TO 35 MPH
THROUGH PORTAGE VALLEY AND TURNAGAIN ARM.
.SUNDAY...RAIN AND SNOW. HIGHS IN THE 30S. NORTH TO EAST WIND
10 TO 25 MPH EXCEPT EAST 35 TO 50 MPH THROUGH PORTAGE VALLEY
AND TURNAGAIN ARM.
.SUNDAY NIGHT...RAIN LIKELY. LOWS IN THE 30S.

TEMPERATURE / PRECIPITATION

SEWARD 28 16 29 / 0 0 40
GIRDWOOD 25 8 28 / 0 0 30


WEATHER STATION SUMMARY for last 24 hours at TURNAGAIN PASS

3800-Sunburst Wx Station
Current Temp: 10 (12 degrees colder than yesterday)
Winds: light out of the east with moderate gusts in the single digits.

2600-Seattle Ridge Wx Station
Winds: light out of the east with moderate gusts in the single digits.

1800-Center Ridge Wx Station
Current Temp: 16 degrees (9 degrees colder than yesterday)
Precip: .4 new water, 5" new snow, 92" total snowpack

Thanks for checking todays avalanche advisory. I'll post again tomorrow Saturday, February 27th.

 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: Mar 20, 2019 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: Open
Placer River: ClosedClosed as of 3.20.19 due to lack of snow.
Skookum Drainage: ClosedPlacer access closed as of 3.20.19 due to lack of snow.
Turnagain Pass: Open
Twentymile: ClosedClosed as of 3.20.19 due to lack of snow.
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: ClosedClosed as of 3.20.19 due to lack of snow.
Summit Lake: Open

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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
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