Avalanche Advisory
Advisory: Ogden Area Mountains Issued by Evelyn Lees for Wednesday - January 10, 2018 - 7:31am
bottom line

The Avalanche Danger will rise to HIGH on steep, mid and upper elevation slopes facing northerly through easterly. Large, long running avalanches can be triggered or run naturally, especially during periods of heavy snowfall or stronger winds. A CONSIDERABLE DANGER exists on most other slopes, with dangerous avalanche conditions. Travel in avalanche terrain is not recommended.

Only those with the skills to identify and avoid avalanche terrain should travel in the backcountry today - on slopes less steep about 30 degrees, which are not below steeper terrain, such as meadows and rolling, low angle terrain.




avalanche warning

THE FOREST SERVICE UTAH AVALANCHE CENTER IN SALT LAKE CITY HAS ISSUED A BACKCOUNTRY AVALANCHE WARNING.

* TIMING…IN EFFECT FROM 6 AM MST THIS MORNING TO 6 AM MST THURSDAY

* AFFECTED AREA…FOR THE MOUNTAINS OF NORTHERN UTAH INCLUDING THE WASATCH RANGE...PROVO AREA MOUNTAINS...BEAR RIVER RANGE...WESTERN UINTA MOUNTAINS...

* AVALANCHE DANGER…THE AVALANCHE DANGER IS HIGH.

* IMPACTS…HEAVY SNOW HAS OVERLOADED THE PREEXISTING WEAK SNOW PACK. THE AVALANCHE DANGER IS HIGH AND BOTH HUMAN TRIGGERED AND NATURAL AVALANCHES ARE LIKELY. TRAVEL IN AVALANCHE TERRAIN IS NOT RECOMMENDED. AVALANCHES CAN BE TRIGGERED FROM A DISTANCE AND FROM BELOW. STAY OFF OF AND OUT FROM UNDER SLOPES STEEPER THAN 30 DEGREES.

BACKCOUNTRY TRAVELERS SHOULD CONSULT WWW.UTAHAVALANCHECENTER.ORG OR CALL 1-888-999-4019 FOR MORE DETAILED INFORMATION.

THIS WARNING DOES NOT APPLY TO SKI AREAS WHERE AVALANCHE HAZARD REDUCTION MEASURES ARE PERFORMED.
current conditions

The cold front is just hitting the Ogden area mountains as I type this…but ahead of the cooler air, it was another warm, soggy night, with light rain and snow falling, and the rain/snow line still hovering around 7,500 to 7,800. Temperatures have been in the low to upper 30s at the lower and mid elevations, cooling into the 20s at the upper elevations. Winds are still from the southwest, and were quiet overnight, but are ramping up with the frontal passage, with speeds of 50, gusting in the 60s on Mt. Ogden. Speeds should increase at the mid elevations, too.

Another 3 to 5” of dense snow fell overnight at the upper elevations, with more rain at the lower elevations. Storm totals in the Ogden area mountains are now about 6", with an inch of water. Ben Lomond Peak snotel is the exception, going for trophy amounts of over 3.5" of water.

recent activity

In the Ogden area mountains, resorts reported both skier and explosive triggered slides, with the mid elevations included in the avalanche activity. Wet loose sluffs at the lower elevations. Two days ago, there were large remote avalanches triggered in the Ogden area mountains.

Similar slides in the Salt Lake area mountains show what can happen anywhere in the northern Utah mountains - Yesterday, a party on the ridgeline above Meadow Chutes, Silver Fork, remotely triggered a long running slide – about a foot deep, 100’ wide, that ran over 1000’ vertical; avalanche reduction work at the resorts triggered new snow slides with ski cuts, up to a foot deep and large enough to bury a person.

Meadow Chutes avalanche photos - Nathan Chaszeyka
Avalanche Problem 1
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 12 hours
description

We now have a slab over the patchwork of persistent weak layers – the multiple layers of sugary facets and crusts. Some slopes will avalanche naturally, but many slopes are hanging in balance, just waiting for a trigger. Don’t let it be you. Avalanches can be triggered remotely and from below. Any slide you trigger on a steep slope today will be large enough to take you for a ride and bury you. An avalanche staring in the new storm snow may step down deeper weak layers, and be very long running as it entrains snow down the slope. There may be cement like wet debris if the slide runs down into the mid elevations.

Avalanche Problem 2
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 12 hours
description

Over 24 hours of rain and wet snow has created at soggy snow pack below about 8,500’, and both natural and human triggered wet loose sluffs and wet slab avalanches are possible. Anywhere there is snow down low, avoid steep terrain, including even small features such as creek beds, road banks and gullies.

Avalanche Problem 3
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 24 hours
description

Winds are forecast to increase with frontal passage, and will drift snow at the higher and mid elevations, overloading the weak layers in the snowpack. Any period of strong winds is when natural avalanches may occur
weather

The cold front is just reaching the Ogden area mountains. An additional 3 to 8” of snow is possible by evening. Winds will shift to the northwest and increase with frontal passage – 15 to 25 mph averages, gusting to 25 mph. The highest terrain will have averages to 50 mph, with gusts in the 60s. A few lingering snow showers tonight, with temperatures finally cooling – into the teens. The northwesterly winds will decrease overnight.
general announcements

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This information does not apply to developed ski areas or highways where avalanche control is normally done. This advisory is from the U.S.D.A. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur.