WTMA20 FIMP 050655 TTT WARNING OF STORM FORCE WINDS INDUSA HAS WEAKENED INTO A SEVERE TROPICAL STORM. AT 0600 UTC, SEVERE TROPICAL STORM 13 (INDUSA) 981 HPA WAS CENTRED WITHIN 20 NM RADIUS OF POINT 28.0 S / 70.7 E (TWENTY EIGHT DECIMAL ZERO DEGREES SOUTH AND SEVENTY DECIMAL SEVEN DEGREES EAST) MOVEMENT: SOUTH-SOUTH-EAST 23 KT THREAT AREAS: SQUALLY WEATHER WITHIN A 100 NM RADIUS AROUND THE CENTER, EXTENDING UP TO 250 NM IN THE SOUTH-EASTERN SEMI-CIRCLE. STORM FORCE WINDS 50/55 KT AND HIGH TO VERY HIGH SEAS WITHIN A 20 NM RADIUS FROM THE CENTRE, EXTENDING UP TO 45 NM IN THE EASTERN SEMI-CIRCLE. GALE FORCE WINDS 35/45 KT AND VERY ROUGH TO HIGH SEAS WITHIN A 50 NM RADIUS FROM THE CENTRE, EXTENDING UP TO 55 NM IN THE NORTH-WESTERN QUADRANT, UP TO 90 NM IN THE SOUTH-EASTERN QUADRANT AND UP TO 110 NM IN THE NORTH-EASTERN QUADRANT. NEAR GALE FORCE WINDS 30 KT AND ROUGH TO VERY ROUGH SEAS WITHIN A 110 NM RADIUS FROM THE CENTRE, EXTENDING UP TO 140 NM IN THE SOUTH-EASTERN QUADRANT AND UP TO 185 NM IN THE NORTH-EASTERN QUADRANT. STRONG GUSTS UNDER SQUALLS. END=