Avalanche Advisory Archive Pre-2016
Date Issued: | 2012-02-05 |
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Danger: | 3 |
Trend: | 2 |
Probability: | 3 |
Size: | 2 |
Problem: | 0 |
Discussion: | The National Weather Service Forecasts- TODAY...INCREASING CLOUDS. PATCHY FOG IN THE MORNING. HIGHS AROUND 40...EXCEPT AROUND 50 IN WINDY AREAS. NORTHEAST WIND 15 TO 25 MPH DECREASING TO 10 TO 20 MPH LATE IN THE AFTERNOON. WIND GUSTS UP TO 40 MPH IN THE MORNING NEAR INTERIOR PASSES AND DOWNTOWN JUNEAU. TONIGHT...CLOUDY. LOWS AROUND 31. EAST WIND 10 TO 15 MPH. MONDAY...MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN AND SNOW IN THE It is currently 29 at tht Juneau Airport. We are experiencing a temperature inversion. After our period of high avalanche danger earlier this week temperatures cooled off mid day on Friday and went below freezing at the tram summit elevations until Midnight Friday night... Since Midnight Friday night temperatures have risen by 9f degrees at the Mt Roberts Tram Summit and are currently at 41f. Once again right at the highest temperatures we have seen since October... At the Eaglecrest Summit temperatures have also been above freezing for the last 12 hours and are currently 35f. This is creating a spring like condition in our snowpack with free moisture and is weakening the bonds. In the end this has the ability to add additional strength to our snowpack due to additional settlement and consolidation, but be aware that through todays diurnal fluctuation and mid-day warming danger levels will be CONSIDERABLE. Some small wet natural avalanches are possible possible in places where the snowpack remains weak. Human triggered avalanches possible, especially on steep open unsupported or unanchored faces or on steep convex rolls. As this inversion breaks down later this afternoon and into the evening we expect to see temperatures falling to below freezing once again and the danger levels will decrease. HAPPY SUPERBOWL SUNDAY EVERYONE>>> |
Tip: | Melt Freeze Snow- Occurs when temperatures rise above freezing and below freezing again and again... As temperatures rise the frozen water between the grains melts, weakening the snowpack. As temperatures cool to below freezing once again the snowpack will refreeze and gain additional strength. |
Forecaster: | Tom Mattice |