WTJP32 RJTD 181500 WARNING 181500. WARNING VALID 191500. STORM WARNING. SEVERE TROPICAL STORM 1621 SARIKA (1621) 985 HPA AT 19.9N 109.2E GULF OF TONGKING MOVING NORTHWEST 07 KNOTS. POSITION FAIR. MAX WINDS 55 KNOTS. RADIUS OF OVER 50 KNOT WINDS 50 MILES. RADIUS OF OVER 30 KNOT WINDS 150 MILES. FORECAST POSITION FOR 190300UTC AT 20.9N 108.6E WITH 30 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 50 KNOTS. FORECAST POSITION FOR 191500UTC AT 21.6N 107.8E WITH 50 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 994 HPA, MAX WINDS 45 KNOTS. JAPAN METEOROLOGICAL AGENCY.=