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Plot Information:
The shaded polygon layer illustrates the most recent GFS forecast of the height of the freezing level every six hours for 0 to 72 hours. These values are averaged over each "HUC-8" watershed over California, whereas the circle points data locations indicate where you can click to view an 8-day plume diagram of the ensemble freezing level at that point from the NCEP GFS Ensemble. We choose not to show freezing levels beyond 8 days due to the degradation of horizontal and temporal resolution of the data provided by the NCEP GFS Ensemble beyond 192 hours. If you click on a watershed, a time series of 3-hourly precipitation out to 10 days will load at right. Hovering over a watershed will yield it's freezing level at that time and watershed name. Use the slider to advance forecast time forward.