Turnagain Pass RSS

Archives
ARCHIVED - Forecasts expire after 24 hours.
Issued
Sat, November 20th, 2010 - 7:00AM
Expires
Sun, November 21st, 2010 - 7:00AM
Forecaster
CNFAIC Staff
Avalanche risk The Bottom Line

Good morning backcountry travelers this is Matt Murphy with the Chugach National Forest Avalanche Information Center on Saturday, November 20th at 7am. 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

All areas designated for snowmachines on Chugach National Forest lands are still closed. We are measuring the snow in these areas daily and will open them as soon as there is enough snow to protect the ground and vegetation from being torn up by the tracks of a snowmachine. Thanks for your patience.

WEATHER ROUNDUP

-TEMPS: There is still a temperature inversion this morning; so, temps are colder down low at sea level than up high on the ridges where temps are above freezing. These warm temps may affect the glide cracks.

-PRECIP: There has been zero (0.0 inches) precip that has fallen in 24 hours, and NOAA is forecasting zero (0.0 inches) of precip for today.

-WIND: Has been light with moderate gusts in the past 24 hours in the mountains around Turnagain Pass. Once again, NOAA is forecasting strong wind this evening through Sunday near Whittier.

AVALANCHE DISCUSSION

The avalanche danger rating will remain at LOW with pockets of MODERATE. Due to glide cracks that are widespread throughout the region.

The glide cracks and glide avalanches continue to be present, with new ones being observed region-wide on a daily basis. Be aware of your travel routes and try to avoid spending time below the cracks. Research has shown it is nearly impossible to predict when these cracks will release. The only way to reduce your risk from glide avalanches is to avoid traveling below the obvious cracks.


This photo shows the South face of Cornbiscuit taken on 11-16-10. For scale take note that the crack is 4-6 feet deep. The glide crack on the left hand side of this photo has already avalanched; while, the glide crack on the right is still a hazard that could avalanche any day. Avoid traveling underneath glide cracks just like the one on the right hand side of this photo.

AnCNFAIC Staff area of concern are pockets of poorly structured snow along ridges and prominent terrain features where small human-triggered avalanches are possible. The most likely terrain for these avalanches will be unsupported pockets above cliff bands or on basketball shaped rollovers.

The Nation Weather Service weather forecast for:

WESTERN PRINCE WILLIAM SOUND-

INCLUDING…WHITTIER…SEWARD…GIRDWOOD…MOOSE PASS

500 AM AKST SAT NOV 20 2010

…STRONG WIND THIS EVENING THROUGH SUNDAY AFTERNOON NEAR WHITTIER…

.TODAY…MOSTLY SUNNY. PATCHY FOG. HIGHS IN THE LOWER 20S TO

LOWER 40S…COOLEST INLAND. LIGHT WINDS EXCEPT NORTH WIND INCREASING

TO 15 TO 25 MPH IN THE AFTERNOON NEAR SEWARD. NEAR WHITTIER…LIGHT

WINDS BECOMING SOUTHWEST 15 TO 30 MPH IN THE AFTERNOON.

.TONIGHT…MOSTLY CLEAR. LOWS IN THE LOWER TEENS TO

LOWER 30S…COOLEST INLAND. VARIABLE WIND TO 10 MPH INLAND. NEAR

SEWARD…NORTH WIND 15 TO 25 MPH. NEAR WHITTIER…SOUTHWEST WIND 30

TO 45 MPH.

.SUNDAY…MOSTLY SUNNY IN THE MORNING THEN BECOMING PARTLY

CLOUDY. HIGHS IN THE LOWER 30S TO MID 40S…COOLEST INLAND. LIGHT

WINDS INLAND. NEAR SEWARD…NORTH WIND 15 TO 25 MPH. NEAR

WHITTIER…SOUTHWEST WIND 25 TO 40 MPH WITH GUSTS TO 50 MPH.

TEMPERATURE / PRECIPITATION

SEWARD 40 28 44 / 0 0 0

GIRDWOOD 27 15 32 / 0 0 0

WEATHER STATION SUMMARY for Turnagain Pass:

3800′-Sunburst Wx Station

Temp (5am): 34 (2 degrees warmer than yesterday morning) Temps have mostly been above freezing at this elevation for the past 24 hours with a max temp of 38 degrees.

Winds: In last 24 hours winds have been light averaging 1-11mph with a moderate max gust of 18 mph

2400′-Seattle Ridge Wx Station

Temp (5am): 29 (4 degrees colder than yesterday morning). Warm temps in past 24 with a max temp of 37 degrees

Winds: In last 24 hours have been light averaging 1-12mph with a light max gust of 12mph.

1800′-Center Ridge Wx Station

Temp (5am): 25 (1 degree warmer than yesterday morning)

Precip: 0.0 inches of water, 45″ of total snopack depth (1 inch less due to settlement)

The next advisory will be issued tomorrow Sunday morning 11/21/2010 at 7am. If you get out in the backcountry send us your observations using the button at the top of this page or call and leave a message at 907-754-2369. Thanks and have a great day.

Sat, November 20th, 2010
Alpine
Above 2,500'
1 - Low
Avalanche risk
Treeline
1,000'-2,500'
1 - Low
Avalanche risk
Below Treeline
Below 1,000'
1 - Low
Avalanche risk
0 - No Rating
1 - Low
2 - Moderate
3 - Considerable
4 - High
5 - Extreme
Avalanche risk Avalanche risk Avalanche risk Avalanche risk Avalanche risk
Travel Advice Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features. Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern. Dangerous avalanche conditions. Dangerous avalanche conditions. Very dangerous avalanche conditions. Travel in avalanche terrain not recommended. Extraordinarily dangerous avalanche conditions. Avoid all avalanche terrain.
Likelihood of Avalanches Natural and human-triggered avalanches unlikely. Natural avalanches unlikely; human-triggered avalanches possible. Natural avalanches possible; human-triggered avalanches likely. Natural avalanches likely; human-triggered avalanches very likely. Natural and human-triggered avalanches certain.
Avalanche Size and Distribution Small avalanches in isolated areas or extreme terrain. Small avalanches in specific areas; or large avalanches in isolated areas. Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas. Large avalanches in many areas; or very large avalanches in specific areas. Very large avalanches in many areas.
Observations
Recent Observations for Turnagain Pass
Date Region Location
11/16/23 Turnagain Observation: Tincan Common
11/14/23 Turnagain Observation: Sunburst/Magnum
11/14/23 Turnagain Observation: Seattle Ridge
11/13/23 Turnagain Avalanche: Tincan Trees
11/12/23 Turnagain Observation: Sunburst
11/12/23 Turnagain Avalanche: Goldpan – avalanche
11/11/23 Turnagain Observation: Tincan Common
11/11/23 Turnagain Observation: Taylor Pass – Sunburst
11/10/23 Turnagain Observation: Tincan
11/10/23 Turnagain Observation: Tincan Trees
Riding Areas

The riding areas page has moved. Please click here & update your bookmarks.

Subscribe to Turnagain Pass
Avalanche Forecast by Email

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.