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Turnagain Area Avalanche Advisory
Wednesday, March 10th 2010 7:18 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 Matt Murphy with the Chugach National Forest Avalanche Information Center on Wednesday March 10th, 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
Placer River and Skookum will open to snowmachines today 3/10/2010.

WEATHER ROUNDUP
-The winds have continued to back off since the big storm two days ago. Current average winds speeds are light this morning between 3mph-9mph with light gusts up to 16mph.
-In the last 24 hours (5am-5am), the snotel sites recorded: 0.1 inch of water and 5 inches of snow settlement at Grandview, and 0.0 inches of water and 2 inches snow settlement at Summit Creek, and .3 inches of water and 7 inches of snow settlement in Girdwood Valley.
-The current radar shows some broken precip over Prince William Sound heading toward Cordova, but the Kenai radar is mostly clear.
-Temps have cooled off drastically at all wx stations this morning by 11-18 degrees since yesterday. Current temps are 7 degrees F at sea-level and negative 4 degrees F at 3800.


AVALANCHE DISCUSSION
Todays avalanche danger will remain at CONSIDERABLE due to active snow settlement and not enough time since the last major storm, CONSIDERABLE is defined as DANGEROUS avalanche conditions.

We have had a rapid change in temperature in the past 24 hours, and the weather stations are indicating that the snowpack is shrinking or settling fairly quickly. This is common with light density snow following a storm, but it shows that the snowpack is still actively moving and adjusting. Our snowpack still needs some more time before the uncertainty level about avalanches can be reduced.

With that being said, there is some uncertainty in the current snowpack. There were some large natural and artillery triggered avalanches yesterday morning, and we were unable to go to drive south of Girdwood to get any observations from our core advisory area of Turnagain Pass. Except for the weather stations, we have NO DATA from Turnagain Pass for this mornings report.

Terrain steeper than 35 degrees could potentially be dangerous today. Although the weather has backed off, natural avalanches are still possible today, however, human triggered avalanches are the main danger today. The danger rating of CONSIDERABLE is the most dangerous rating for the human factor. When the avalanche danger is high or extreme, most people do not travel in the mountains. Now that the weather has backed off, this is the time when people start to venture out into the mountains. This is when peoples goals and objectives intersect with unstable snow. Most avalanche fatalities occur when the danger scale reads CONSIDERABLE, just like today. Simply waiting anCNFAIC Staff day or two for the snowpack to adjust could mean the difference between life and death. Dont get lured into the I love big dumps syndrome. Dont put yourself on steep terrain today.

Secondary avalanche concerns today are glide cracks and cornices. A full depth glide crack release was observed the day before the most recent storm (see photo gallery). Its difficult to say if the new load or the rapid change in temperature will effect these crevasse like features because glide cracks are very difficult to predict. Additionally, its always best to avoid cornices immediatley following a major wind and snow event.

WEATHER FORECAST (National Weather Service)
WESTERN PRINCE WILLIAM SOUND-
INCLUDING...WHITTIER...SEWARD...GIRDWOOD...MOOSE PASS
500 AM AKST WED MAR 10 2010

...STRONG WIND THURSDAY MORNING THROUGH THURSDAY EVENING NEAR
WHITTIER...
.TODAY...MOSTLY CLOUDY WITH SCATTERED SNOW SHOWERS NORTH OF MOOSE
PASS. PARTLY CLOUDY ELSEWHERE. HIGHS IN THE TEENS. VARIABLE WIND 10
MPH EXCEPT NORTH 10 TO 20 MPH NEAR SEWARD.
.TONIGHT...DECREASING CLOUDS. ISOLATED SNOW SHOWERS IN THE EVENING.
LOWS ZERO TO 5 ABOVE. NORTHWEST WIND 10 TO 15 MPH EXCEPT WEST
20 TO 35 MPH NEAR WHITTIER.
.THURSDAY...MOSTLY SUNNY. HIGHS IN THE TEENS. NORTHWEST WIND 10 TO
25 MPH EXCEPT WEST 30 TO 45 MPH NEAR WHITTIER.

Temperature / Precipitation

SEWARD 17 2 19 / 0 0 0
GIRDWOOD 14 1 17 / 50 20 0


Short Term Weather Model Forecasts (NAM, WRF, GFS) for the Kenai Mountains near Turnagain Pass
Sea-level: temps are forecasted between 1-14 and between 0.0-0.1 of water forecasted
3000: temps are forecasted in the range of 5 to 14 degrees F with winds 5 mph
6000: temps are forecasted in the range of (minus 4) to 5 degrees F with winds 5-10 mph

WEATHER STATION SUMMARY for last 24 hours at TURNAGAIN PASS
3800-Sunburst Wx Station
Current Temp: -4 (18 degrees colder than yesterday)
Winds: In last 24 hours winds have been light to strong averaging 2-36mph with extreme gusts up to 56mph

2600-Seattle Ridge Wx Station
Winds: In last 24 hours winds have been calm to moderate averaging 0-24mph with an extreme gust of 39mph

1800-Center Ridge Wx Station
Current Temp: not working
Precip: not working

Thanks for checking todays avalanche advisory. The next one will be posted tomorrow Thursday March 11, 2010.


 Show the Complete North American Avalanche Danger Scale
3 Considerable Alpine / Above 2,500' Travel Advice: Dangerous avalanche conditions. Careful snowpack evaluation, cautious routefinding and conservative decision-making essential.
3 Considerable Treeline / 1,000'-2,500' Travel Advice: Dangerous avalanche conditions. Careful snowpack evaluation, cautious routefinding and conservative decision-making essential.
3 Considerable Below Treeline / Below 1,000' Travel Advice: Dangerous avalanche conditions. Careful snowpack evaluation, cautious routefinding and conservative decision-making essential.

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
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