Monthly Climatological Precipitation and 925 hPa Vector Wind
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Precipitation Data: CAMS_OPI monthly precipitation climatology on a 2.5 x 2.5 deg. lat/lon grid
Wind Vector Data:  NCEP monthly Reanalysis climatology on a 2.5 x 2.5 deg. lat/lon grid
Base Period for Precipitation Climatology:  1961-1990 over land, 1979-present over ocean areas
Base period for Wind Climatology:  1961-1990
Data Source:  NCEP, Climate Prediction Center USA

Monthly precipitation (mm/month)  based on satellite precipitation estimates over ocean areas and rain guage data over land regions.  Contours are drawn at 50 mm intervals.   Climatological wind vectors for the 925 hPa pressure level indicate wind direction with with speed proportional to the lenth of the vectors.

"CAMS" is an acronym for the "Climate Anomaly Monitoring System" in use at the Climate Prediction Center (CPC) at the US National Centers for Environmental Prediction (NCEP).  "OPI" stands for "Outgoing longwave radiation Precipitation Index" (the statellite precipitation estimates are based on emitted longwave radiation observed by polar-orbiting satellite.)