NASA released two images on January 23, 2014 through their excellent Earth Observatory site. The images compare California and Nevada on the same dates in 2013 and 2014 as seen from space. The images graphically illustrate the severity of the drought situation in the region. See this link for full story. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite obtained the images on January 18 of each year. This first image is from 2014. The second is from 2013. Click each one for an enlargement of 10x.
What stands out is the lack of snow cover in the mountains in 2014. It is 10 to 30% of normal. Some areas have none. California gets 1/3 of its water from snow. Another feature less visible is the light tan color of the top 2014 image in the growing regions of the Sacramento and San Joaquin Valleys. It indicates the absence of vegetation. Normally, this region gets half of its precipitation between December and February. The region is on track to be the driest on record in the coming months.
The article in Earth Observatory provides a convenient tool to easily compare the two images. Here is a short video showing how that tool works. Watch it, then go to the article and try it yourself.
For California in particular, this chart illustrates their problem. The blue line is the normal precipitation pattern. It rises to 3-4″ values during the winter months and falls to less than 1″ in the summer. The red bars indicate actual precipitation has been below normal values. Each of the recent winters show below normal precipitation in the normally wet time of year. Governor Brown issued a state of emergency January 17 urging citizens to conserve water.