Dear Colleagues, 

This is to announce the release of our updated data  
set of global monthly precipitation which we call
monthly CMAP (CPC Merged Analysis of Precipitation). 

The current version of the data set covers a 54-year-3-month
period from Jan. 1979 to Mar. 2024. 

For the period from Jan.1979 to Dec.2008, the 
analysis is the same as in the previous version (v1501).   

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Precipitation analysis was messed up in the previous version 
from Jan.2009 to Nov.2014 due to a mistake in a program to copy 
the data from working files to the final analysis. We have 
corrected problem in this Version.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!   NOTICE   !!!!!!!!!!!!!!!!!!!!!!!!!!!!
Due to changes in the input data sets, discontinuities may observe 
in the analysis between periods before and after 2009.  While we 
are working on the issues, users should be cautious in 
applications where high quantitative accuracy is required.  
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

You may get the compressed ASCII data files along with
a document file through ftp:  

        ftp ftpprd.ncep.noaa.gov  
        name:  anonymous 
        passwd:  (your e-mail address) 
        cd /pub/precip/cmap/monthly  
        get cmap_mon_v2404_yy.txt.gz    (data file for 19yy, or 20yy) 
        get cmap_mon_v2404.doc          (document)

Please check the above mentioned ftp site for updates
and extensions of the data set.

Please contact us if you have any problems or questions
concerning the merged analysis data. 

Please be advised that the CMAP data set may contain an artificial 
downward trend for period after 1996. Cares must be taken when using
the data set for accurate quantitative applications.   

Thanks for your interest!

Pingping Xie