Sierra Nevada Watersheds Make Impressive Gains



Rain and snow in the past 72 hours across California have pushed precipitation amounts in the Sierra Nevada watersheds to above normal through March 6th. This the highest they have been on this date in five years. The Northern Sierra Nevada 8-Station index picked up over 6 inches of rain, while the Central Sierra 5-Station Index and the Tulare Basin 6-Station Index received 3.86 and 2.20 inches respectively.

For the Northern Sierra this brings the rainfall season precipitation to date to 107% of normal, the Central Sierra to 106% and the Tulare Basin to 100%. 

Note: There will be a minor discrepancies between these figures and those published by Calif. DWR which uses the Oct. 1 Water Year instead of the historical rainfall season of July 1 to June 30. DWR also does not use the standard 30-year climatological normal (1981-2010) but rather non-standard average period of 1922-1998 for the 8-Station Index and 1961-2010 for the 5 and 6-Station Indices.   

Jan Null, CCM
Golden Gate Weather Services