WTPH20 RPMM 261800 TTT GALE WARNING 04 AT 1800 26 APRIL TROPICAL STORM {MUIFA} (1701) WAS ESTIMATED BASED ON ALL AVAILABLE DATA AT ONE FOUR POINT SIX NORTH ONE THREE FOUR POINT FOUR EAST FORECAST TO MOVE NORTH AT ZERO FOUR METERS PER SECOND ROUGH TO VERY ROUGH SEAS WITHIN ONE FIVE ZERO KILOMETER RADIUS ESTIMATED CENTRAL PRESSURE NINE NINE EIGHT HECTOPASCALS MAXIMUM WINDS ONE EIGHT METERS PER SECOND NEAR THE CENTER ONE THREE METERS PER SECOND WITHIN ONE FIVE ZERO KILOMETER RADIUS FORECAST POSITIONS 271800 ONE SEVEN POINT SIX NORTH ONE THREE FIVE POINT THREE EAST AT 281800 TWO ZERO POINT FIVE NORTH ONE THREE NINE POINT TWO EAST ALL SHIPS WITHIN STORM AREA ARE REQUESTED TO SEND THREE HOURLY WEATHER REPORT TO PHILIPPINE ATMOSPHERIC GEOPHYSICAL AND ASTRONOMICAL SERVICES ADMINISTRATION PD PAGASA=