Drought Monitor Map
Light to moderate precipitation prompted a few improvements from central Nevada southward through southeastern California, but heavy to excessive precipitation pounded areas farther west through most of California, particularly the Sierra Nevada, coastal locations, and the southwestern interior. Between 8 and 12 inches were common through the Sierra Nevada while 4 to locally 10 inches were dropped on areas farther west and southwest. Adjacent areas to the east of the Sierra Nevada and most of central and south-central California (outside a small area south of the Sierra Nevada) recorded at least an inch. According to the San Joaquin precipitation index (an average across that region), January was the wettest ever observed in 112 years of record, and 4- to 5-year precipitation totals climbed dramatically from approximately the 2 percentile level as of early January to around the 20th percentile through this week. Statewide average snowpack (snow water equivalent) is almost twice normal for late January, and somewhat more than twice normal in the southern Sierra Nevada. Amounts actually exceed those typically recorded April 1 (snowpack climatological maximum). Given these dramatically wet indicators, widespread 1-category improvements were again instituted this week, wiping D4 from the state and restricting D3 to part of southwestern California. It should be noted, however, that to date groundwater levels have not responded as one might expect, and remain critically low. In most of the central foothills on the east side of the San Joaquin Valley, plus a number of other communities and cities across the nearby mountains and valleys, water supply is dependent on groundwater. Thus potable water is still being trucked in to serve residents with dry wells in areas such as Tuolumne County, and the deepest wells may not respond to the recent inundation for many more months.
As more drought information and resources are made available, additional postings to this page will be added.