WTJP21 RJTD 121800 WARNING 121800. WARNING VALID 131800. WARNING IS UPDATED EVERY 6 HOURS. GALE WARNING. TROPICAL STORM 1702 MERBOK (1702) DOWNGRADED FROM SEVERE TROPICAL STORM 994 HPA AT 22.9N 114.6E SOUTH CHINA MOVING NORTH 10 KNOTS. POSITION FAIR. MAX WINDS 45 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 90 MILES. FORECAST POSITION FOR 130600UTC AT 25.2N 114.8E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1004 HPA. BECOMING TROPICAL DEPRESSION. FORECAST POSITION FOR 131800UTC AT 26.4N 117.2E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1004 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=