Important: The Climate Analysis Branch (PSD1) web site will be down in anticipiation of our major web restructuring starting Tuesday Jan 20th at 1pm MST.
You can find more info about the upcoming URL changes here.
 

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Anomaly   =   (Current Observation   -   Corresponding Climatological Value)
The date indicates the first day of the averaged week.
Base period for the climatology is 1979-95