The last 12 months in California have been the driest on record since weather records began in 1885.
NASA’s Earth Observatory recently showed us just how seriously the drought is impacting Californian vegetation statewide from the redwood forest to grassy Central Valley. This MODIS satellite image shows where the vegetation in California is less green than normal (brown) or more green than normal (blue/green). NASA is able to categorize “greenness” because drought-stressed plants reflect visible light more then unstressed plants and MODIS detects changes overtime as it orbits the planet.
If you look at the coast redwood forest region along the north coast, you’ll notice the color is primarily white, a color given to average “greenness” for this time of year. The redwood forest is mostly evergreen and redwoods keep their leaves all year long, even during droughts like the one we’re experiencing. In contract, the central valley is shockingly brown, indicating that the annual plants that normally are growing vigorously this time of year are barely growing, if at all. Along the west side of the Sierra Nevada, where the giant sequoia forests are, the landscape appears greener than normal for this time of year. This is because snow typically covers this region in winter and hides the ground vegetation. These plants may have an extremely long, dry season ahead if snow doesn’t accumulate soon.