Note to users: Most of the NERFC precipitation total and departure products are
updated daily. These products were updated only once a week prior to January 5, 2011. The
graphics for monthly data and the accompanying text product are created in the late afternoon
on the second of each month for the previous month.
An error was found with the departures from normal for Chemung County New York prior to December 29, 2010.
Products created after that date will have the correct values.
Data Description: The precipitation totals used in these graphics and the accompanying
text products are from the 6-hourly County Mean Areal Precipitation (MAP) calculated for use in the Northeast
River Forecast Center's Community Hydrologic Prediction System (CHPS.)
Precipitation totals are calculated for the most recently completed Hydrologic Day. For example, the products generated on
October 24, 2011 will include data through 12Z on October 24, 2011. The monthly totals and departures are calculated from the
first day of the month at 12Z through 12Z on the first day of the next month.
The "normal" precipitation is derived from PRISM climate data, created at Oregon State University. The 30 year
PRISM normal from 1971-2000 is used for these graphics and the accompanying text products. For more information
about PRISM go to http://www.prism.oregonstate.edu/
Acknowledgment: The Precipitation Totals and Normals for the counties of Broome,
Chemung, Chenango, Cortland, Delaware, Otsego, Steuben, Sullivan and Tioga in New York State are provided
by the Middle Atlantic River Forecast Center.
Acknowledgment: The graphics for the counties of Broome, Chemung, Chenango, Cortland, Delaware,
Otsego, Steuben, Sullivan and Tioga in New York State are provided by the Middle Atlantic River Forecast Center.