Bollettino valanghe

Ogden

Pubblicato il Jan 27, 2021valido fino al Jan 28, 2021Utah Avalanche Center

Pericolo valanghe

Alta quota
Limite del bosco
Sotto il limite del bosco

Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

The avalanche danger will be on the rise today and we may be at HIGH danger later tonight into tomorrow. Dangerous avalanche conditions will become more widespread in the backcountry.

A CONSIDERABLE DANGER exists on many freshly wind loaded slopes in the mid and upper elevations. Natural avalanches are possible; human triggered avalanches are increasingly likely.

Some of these avalanches may be triggered at a distance...and some of these may step down into older weak layers, leading to a larger and more destructive avalanche.

Low angle slopes are the ticket for the next several days.

If you're leaving a resort boundary through an exit point, you are stepping into CONSIDERABLE avalanche danger.

Problemi valanghivi

Wind Slabs
N
NE
E
SE
S
SW
W
NW
Alta quota
Limite del bosco
Sotto il limite del bosco
Probabilità
Very Likely
Dimensione
2
New and developing wind drifts will likely run naturally today and be sensitive to human provocation on many steep slopes at the mid and upper elevations. Over the past 18 hours, the winds have transported snow from east-southeast as well as southwest. Soft drifts will be found around the compass but more predominantly on west to north to east facing aspects. These drifts will be landing on very low density stellar dendrite snowflakes, well known to be very efficient if not tricky weak layers. Some drifts may triggered at a distance. Remember that shooting cracks are sure signs of unstable wind drifts.

*Note that due to the gusty nature of these winds, drifts may be found well off the ridgelines and eddied in unusual terrain features.

*Note also that we did not see a lot of wind with last Friday/Saturday's storm and there is a lot of snow available for transport.

TREND: INCREASING DANGER
Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Alta quota
Limite del bosco
Sotto il limite del bosco
Probabilità
Likely
Dimensione
3
Our weak layers are proliferating and our complex snowpack is becoming more complex. Today and tomorrow's snow and wind will only add additional stress to one if not both buried persistent weak layers.

The two most problematic weak layers are described below -

- A layer of faceted snow and various patches of surface hoar buried last Friday, now roughly a foot deep. Natural and human triggered avalanches in this layering have occurred in the past several days.

- The old dragons in the basement - facets and depth hoar from the early low tide conditions at and near the base of the snowpack, now buried 2-4' deep. Human triggered avalanches in this layering have occurred in the past several days.

TREND: INCREASING DANGER

Special Announcement

SPECIAL NOTE: HALF OF ALL SKIER/SNOWBOARDER FATALITIES SINCE 99/00 HAVE OCCURRED WITH PEOPLE GOING OUT OF BOUNDS AT A SKI AREA.

Do you have the essential avalanche rescue gear (transceiver, probe, and shovel) and do you know how to use them? Watch this video to see how the three pieces of equipment work together.

Recent Activity

Ski area avalanche teams triggered active mitigation of developing wind drifts yesterday from the bump in southeast winds yesterday, but we didn't hear of any avalanches from the backcountry.

New reports from Monday - an avalanche was noted yesterday at 7700' on the Rodeo Ridge of Ben Lomond 12" deep and 80' wide. Other details are unknown.

Special Public Announcement: IF you trigger an avalanche near one of the resorts, please call it in to the ski patrol so they don't have to put themselves in harms way to conduct a meaningless rescue.

As always, you can find all observations and recent avalanches HERE.

Snow and Weather

It's starting to get interesting.

In the big picture, a strengthening storm off the California coast along with what the NWS is calling a "very significant and unusual atmospheric river event" will pummel the Golden State with unbelievable amounts of precipitation. We'll see wind, warming temperatures, and an upside down trend in snow densities over the next 48 hours.

Currently in the Ogden area mountains, skies are overcast with some areas reporting light snowfall. The Ogden mountains picked up 4-8" of snow in the past 24 hours with some densities measured at 3-4%. It's cold smoke.

Mountain temperatures are in the single digits to mid-teens.

The WINDS ARE THE KEY PLAYER FOR TODAY, however. The southeast to southwest winds have especially picked up and are blowing 30-40mph with gusts to 50. The highest elevations have hourly wind speeds of 55mph with gusts to 70. Wind chill on Mt Ogden is -21°F.

For today, we'll see light snowfall and moderate to strong southwest winds. The winds may take a breather this afternoon but will only return and redouble their efforts overnight. Higher density snow and strong winds are expected for tomorrow. We may see 6-10" by tomorrow evening. Perhaps more in areas favored by a southwest flow.

Additional Info

Find the podcast HERE....or find the Utah Avalanche Center podcast wherever you get your favorite podcasts.

General Announcements

Please visit this website with information about Responsible Winter Recreation by the Utah Office of Outdoor Recreation.

CLICK HERE FOR MORE GENERAL INFO AND FAQ

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

Observations and Avalanches

Backcountry Emergency Procedures