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progress report international satellite cloud climatology project isccp describes changes made produce new cloud data products data examines evidence changes improvements previous version c data summarizes results discusses plans isccp 2005by late 1999 datasets available period july 1983 december 1997the significant changes new dseries cloud datasets 1 revised radiance calibrations remove spurious changes longterm record 2 increased cirrus detection sensitivity land 3 increased lowlevel cloud detection sensitivity polar regions 4 reduced biases cirrus cloud properties using ice crystal microphysics model place liquid droplet microphysics model 5 increased detail variations cloud propertiesthe isccp calibrations complete selfconsistent set calibrations available weather satellite imaging radiometers total relative uncertainties radiance calibrations estimated 5 visible 2 infrared absolute uncertainties 10 3 respectivelybiases detectable cloud amounts reduced 005 except summertime polar regions bias may still 010biases cloudtop temperatures reduced 2 k lowerlevel clouds 4 k optically thin upperlevel clouds except occur lowerlevel cloudsusing liquid ice microphysics models reduces biases cloud optical thicknesses 10 except cases mistaken phase identification remaining bias caused differences actual assumed cloud particle sizes small effects cloud variations scales 5 kmglobal mean cloud properties averaged period july 1983june 1994 following cloud amount 0675 0012 cloudtop temperature 2615 28 k cloud optical thickness 37 03 plusminus values rms deviations global monthly mean values longterm averagelongterm seasonal synoptic diurnal cloud variations illustratedthe isccp dataset quantifies variations cloud properties mesoscale resolution 3 h 30 km covering whole globe decade making possible study cloud system evolution whole life cycles watching interactions atmospheric general circulationplans next decade world climate research programme require continuing global observations clouds practical way fulfill requirement continue isccp replaced capable system similar time resolutions global coverage