WTPH20 RPMM 310600 TTT WARNING 10 AT 0600 31 JULY SEVERE TROPICAL STORM {NIDA} (1604) WAS ESTIMATED BASED ON ALL AVAILABLE DATA AT ONE EIGHT POINT ZERO NORTH ONE TWO TWO POINT ONE EAST FORECAST TO MOVE NORTHWEST AT ZERO FIVE METERS PER SECOND ROUGH TO HIGH SEAS WITHIN TWO FIVE ZERO KILOMETER RADIUS FROM THE CENTER ESTIMATED CENTRAL PRESSURE NINE EIGHT SEVEN HECTOPASCALS MAXIMUM WINDS TWO SIX METERS PER SECOND NEAR THE CENTER ONE THREE METERS PER SECOND WITHIN TWO FIVE ZERO KILOMETER RADIUS FROM THE CENTER FORECAST POSITIONS AT 010600 TWO ZERO POINT NINE NORH ONE ONE SEVEN POINT EIGHT EAST AND AT 020600 TWO FOUR POINT ZERO NORTH ONE ONE THREE POINT ONE EAST ALL SHIPS WITHIN SEVERE TROPICAL STORM AREA ARE REQUESTED TO SEND THREE HOURLY WEATHER REPORT TO PHILIPPINE ATMOSPHERIC GEOPHYSICAL AND ASTRONOMICAL SERVICES ADMINISTRATION PD PAGASA=