WTJP32 RJTD 192100 WARNING 192100. WARNING VALID 202100. STORM WARNING. SEVERE TROPICAL STORM 1820 CIMARON (1820) 992 HPA AT 16.9N 149.5E MARIANAS MOVING NORTHNORTHWEST 08 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 270 MILES SOUTHEAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 200900UTC AT 18.1N 147.4E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 990 HPA, MAX WINDS 55 KNOTS NEAR CENTER. FORECAST POSITION FOR 202100UTC AT 19.3N 145.6E WITH 60 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 985 HPA, MAX WINDS 60 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=