FYI, Snow Water Equivalent is a measure of the amount of water contained within the snowpack. You can think of it as the depth of water that would result if you melted the snowpack. When you see SWE reported at 38% of average you know that one of two things--or more likely some combination of these two things--is true: 1)the depth of the accumulated snowpack is below normal, or; 2)the water content of the snow is below normal, that is, the snowpack is made up of relatively dry snow. Precipitation accumulation tracks the total precipitation received at a monitoring site, for example if the first big snow storm of the water year dumps 53" of snow on Paradise, the SWE of that snow is 25.5", and SNOTEL reports the precipitation accumulation is 65.5" you would know that in addition to the 25.5" SWE Paradise had just received, it had also received 40" (65.5-25.5) of rain previous to the first snow. Precipitation data is of course reported on a "water year" basis(Oct 1st - Sept 30th of the following calendar yr).