RADAR
Nexrad US Precipitation Radar from weather underground. This is a small precipitation radar map of the US.
Sourther Sierra Area Precipitation Radar and the Sattelite Image
SATTELITE
WXP-Sattelite Images has lots of Sattelite images to choose from.
Here is a large pacific sattelite image to track the storms coming in off the pacific ocean.
REAL-TIME DATA AND WEATHER FORECASTS
REAL TIME DATA
California Department of Water Resources has current snow levels at many other snow sensors.
The snow summary by section report gives regional average snow water equivalent, percent of April 1 average and percent of normal for this date.
The NRCS has the SNOTEL station image map available for selecting stations to plot current data.
A precipitation update for all California SNOTEL stations is located here.
WEATHER FORECASTS
The California Cooperative Snow Surveys web site was the source for all data used at the Southern Pacific Crest Trail Snow Page.
I'll be adding more to this soon
BULK DATA SELECTOR - California Department
of Water Resources, Division of Flood Management. For
reference, see the the list of hourly and event
stations (140kb), the list of daily
stations, the list of monthly
stations, precipitation
sensors, or river
gage stations. Snow course
data (combined depth and water content) is also available by
course number.