Avalanche Advisory Archive Pre-2016
| Date Issued: | 2011-04-09 |
|---|---|
| Danger: | 2 |
| Trend: | 4 |
| Probability: | 3 |
| Size: | 2 |
| Problem: | 0 |
| Discussion: | The National Weather Service Forecasts- TODAY...RAIN AND SNOW SHOWERS. LITTLE OR NO SNOW ACCUMULATION. TONIGHT...RAIN AND SNOW SHOWERS. NO SNOW ACCUMULATION. SUNDAY...RAIN SHOWERS LIKELY...MIXING WITH SNOW IN THE MORNING. LITTLE OR NO SNOW ACCUMULATION. SNOW LEVEL INCREASING TO 1100 SUNDAY NIGHT...RAIN SHOWERS LIKELY AND CHANCE OF SNOW SHOWERS. LOWS AROUND 29. LIGHT WINDS. We have received 29mm of precipitation at tram summit elevations in the last 36 hours. This delivered 21cm of dense new snows at that elevation. Eaglecrest is showing 20 cm of new snow as well at the UAS mid mountain plot. Winds averaged well over 20 knots during the first 30 hours of the storm and have since died off. Winds were out of the SSE placing additional stress on our NNW faces. Look to see crossloading in the urban avalanche zones. We have seen an average of a few degrees of diurnal daily warming recently this adds stress to the snowpack during the warming and warmest periods of the day... With nearly 30mm(1.2\") of precip in the last 36 hours, yet less than .3\" of precipitation in the forecast for today and temperatures one degree cooler than yesterday, avalanche danger is Moderate at this time. There may be heightened avalanche conditions on specific terrain features. Be sure to evaluate snow and terrain carefully and identify those features of concern. Natural avalanches are unlikely, yet human triggered avalanches remain possible in areas. The snowpack is mostly stable. Be cautious of convex slopes above steep open faces with long runouts.... Be aware of possible windloading... Check to see how this new snow is bonding to the old snow surface in the areas YOU choose to ride... Yesterday field work revealed trigger sensative areas in wind loaded pockets both at ridgeline and even lower down the mountain. Although time is our friend and the new snow will start to bond to the old snow surface, with increased loading today human triggered avalanches are still quite possible in areas. Should avalanches occur they are not expected to be of any size in the urban areas to be concerned with. |
| Tip: | Special Thanks to SLF the Swiss Snow Institute... They are town this week working on new urban avalanche mitigation studies... We look forward to seeing what the world experts have to say about how to better our avalanche mitigation practices! THANK YOU FOR YOUR HELP! |