Avalanche Advisory Archive Pre-2016
Date Issued: | 2012-01-05 |
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Danger: | 2 |
Trend: | 2 |
Probability: | 3 |
Size: | 2 |
Problem: | 0 |
Discussion: | The National Weather Service Forecasts- TODAY...RAIN SHOWERS IN THE MORNING...THEN SCATTERED SNOW TONIGHT...MOSTLY CLOUDY. ISOLATED SNOW SHOWERS. LOWS AROUND 29. SOUTHEAST WIND 10 TO 15 MPH. FRIDAY...RAIN AND SNOW DEVELOPING BY THE AFTERNOON. SNOW Temperatures stayed very near to freezing the last 48 hours. Even dipping above freezing for several hours both at the Mt Roberts Tram Summit and the Eaglecrest Summits. This near freezing temperature makes for rapid settlement and consolidation in the snowpack. We have received about 25m of precipitation in the last 48 hours. 20mm of which came in the last 24. This delivered some 12cm of new snows at the Mt Roberts Tram Wx Station. But overall from start to finish after settlement and consolidation we only received a net increase of about 3cm. This rapid settlement and consolidation should help to increase the stability in the snowpack. During this same time the UAS site at Eaglecrest had a net increase of 10cm. We expect there to be additional snow at summit elevations. Winds averaged 15-30+ MPH during the event with gusts in to the mid 40's. Adding Considerable windloading to the starting zones. Considering moderate new snow loading and considerable windloading, the avalanche danger is MODERATE at this time. Natural avalanches are unlikely yet human triggered avalanches remain possible. Be cautious in areas near summit and ridgeline and in typical windloaded areas. With not much precip in the forecast for today, cooling temperatures, and moderate winds, avalanche danger will continue to fall for the next 24-48 hours. Have a great day. |
Tip: | Melt Freeze Snow- When temperatures rise above freezing for periods of time then drop back below and freeze up again we often refer to his as Melt Freeze Snow. As temperatures rise the the frozen water between the grains melts, weakening the bonds. As the snowpack refreezes again at cooler temperatures it then gains additional strength. |