WTJP21 RJTD 170000

WARNING 170000.

WARNING VALID 180000.

WARNING IS UPDATED EVERY 6 HOURS.

STORM WARNING.

SEVERE TROPICAL STORM 1607 CHANTHU (1607) UPGRADED FROM TROPICAL

STORM 980 HPA

AT 37.7N 141.7E SEA EAST OF JAPAN MOVING NORTH 19 KNOTS.

POSITION GOOD.

MAX WINDS 50 KNOTS NEAR CENTER.

RADIUS OF OVER 30 KNOT WINDS 210 MILES EAST SEMICIRCLE AND 120 MILES

ELSEWHERE.

FORECAST POSITION FOR 171200UTC AT 44.0N 143.6E WITH 40 MILES RADIUS

OF 70 PERCENT PROBABILITY CIRCLE.

975 HPA, MAX WINDS 55 KNOTS.

FORECAST POSITION FOR 180000UTC AT 51.4N 145.6E WITH 80 MILES RADIUS

OF 70 PERCENT PROBABILITY CIRCLE.

980 HPA, MAX WINDS 50 KNOTS.

BECOMING EXTRATROPICAL LOW.



JAPAN METEOROLOGICAL AGENCY.=