Begging your indulgence on a mention yesterday and the beginning of Passover. I assumed that Passover began yesterday at 7:18 PM however it was the beginning of "Purim" that ends this evening at nightfall. "Passover" begins on Friday, April 22nd and ends on Saturday April 30th.  The Skywatcher's Almanac designates another Full Moon on Friday, April 22nd with Moon rise at 8:11 PM and Sunset at 7:37 PM. As noted, astronomers determine a full moon by calculating the percentage of illumination and April's full moon will display  a 99.8% illumination on the 22nd.   Passover or "Pesach" celebrates the deliverance of the Jewish people from Slavery in Egypt. Yesterday I noted that one school of thought suggests "light" was needed for the Israelites to leave Egypt, in darkness, and begin their journey out of bondage. Guiding them was a full, Passover Moon. If Easter is calculated as the first Sunday after the paschal full moon or after the vernal equinox which began on March 20th our current Full Moon would suffice.  Lent began on February 10th and Easter can fall anywhere between March 22 and April 25. From Passover to snow covered passes. For years,  Ed Adams tries to get buried in the snow in Bridger Bowl, Montana. Years ago, World News Tonight reported  that Adams creates the avalanche and then monitors their impact from inside a shed that is bolted to rock directly in the path.  Two hundred tons of snow, traveling at 100 miles-per-hour slams the shed.  Adams and his team of researchers discovered that an avalanche slides as a block rather than a liquid. Once the data is  loaded into a computer, a model avalanche is created. The model includes air temperature, wind velocity and radiation of the sun. These elements determine where and when the snow pack may release and when the avalanche will occur; providing lead time to save lives. In addition, the team also analyzes different samples of snow, discovering that weak snow can lead to an avalanche.