21 October 2017 - bulletin 684

Updated at 2120 GMT
Latest warning for 25W and 27W


NORTHWESTERN PACIFIC OCEAN
SUPERTYPHOON Lan / 25W
Warning 26 from JTWC at 2100 GMT
Position 25.5N 133.3E
Location 303 miles E of Kadena AB, Okinawa, Japan
Movement 020° (NNE) at 18 knots
Maximum sustained winds 135 knots gusting to 165 knots
Winds of 34 knots or higher occur within 250 to 290 miles of the centre
Winds of 64 knots or higher occur within 30 to 40 miles of the centre
Threatened landmasses Japan
Maximum significant wave height 41 feet
Next warning from JTWC at 0300 GMT

Lan will now slowly weaken as it moves northeast. The storm is expected to make landfall near Tokyo at 105 knots, as an extra-tropical system.

Tropical depression 27W
Warning 09 from JTWC at 2100 GMT
Position 11.4N 147.6E
Location 200 miles SE of Hagatna, Guam
Movement 245° (WSW) at 7 knots
Maximum sustained winds 30 knots gusting to 40 knots
Threatened landmasses NONE
Maximum significant wave height 10 feet
Next warning from JTWC at 0300 GMT

27W will move west, later northwest and is expected to strengthen to 65 knots.