WTPH21 RPMM 170600 CCA TTT WARNING 21 AT 0600 17 DECEMBER TROPICAL DEPRESSION {KAI-TAK} (1726) WAS ESTIMATED BASED ON ALL AVAILABLE DATA AT ONE TWO POINT TWO NORTH ONE TWO TWO POINT SIX EAST FORECAST TO MOVE WEST SOUTHWEST AT ZERO FOUR METERS PER SECOND MODERATE TO ROUGH SEAS WITHIN ONE ZERO ZERO KILOMETER RADIUS ESTIMATED CENTRAL PRESSURE ONE ZERO ZERO TWO HECTOPASCALS MAXIMUM WINDS ONE FIVE METERS PER SECOND NEAR THE CENTER FORECAST POSITIONS AT 180600 ONE ZERO POINT EIGHT NORTH ONE ONE NINE POINT FIVE EAST AT 190600 ZERO NINE POINT FIVE NORTH ONE ONE SIX POINT TWO EAST AND AT 200600 ZERO EIGHT POINT SIX NORTH ONE ONE THREE POINT FIVE EAST ALL SHIPS WITHIN TROPICAL DEPRESSION AREA ARE REQUESTED TO SEND THREE HOURLY WEATHER REPORT TO PHILIPPINE ATMOSPHERIC GEOPHYSICAL AND ASTRONOMICAL SERVICES ADMINISTRATION PD PAGASA =