20 July 2018 - bulletin 496

Updated at 2120 GMT
Latest warnings for 12W
First warning for 13W
Disturbance update


NORTHWESTERN PACIFIC OCEAN
Tropical storm Ampil / 12W
Warning 13 from JTWC at 2100 GMT
Position 25.4N 129.3E
Location 104 miles SE of Kadena AB
Movement 335° (NNW) at 12 knots
Maximum sustained winds 45 knots gusting to 55 knots
Winds of 34 knots or higher occur within 95 to 140 miles of the centre
Threatened landmasses Okinawa, China
Maximum significant wave height 18 feet
Next warning from JTWC at 0300 GMT

Ampil is moving northwest. The system will strengthen to 55 knots before making final landfall in eastern China after a day or so.

Tropical depression 13W
Warning 01 from JTWC at 2100 GMT
Position 17.8N 117.2E
Location 291 miles NW of Manila, Philippines
Movement 105° (ESE) at 8 knots
Maximum sustained winds 25 knots gusting to 35 knots
Threatened landmasses Okinawa, China
Maximum significant wave height 6 feet
Next warning from JTWC at 0300 GMT

13W has formed in the South China Sea and will veer northeast, intensifying to 65 knots. The storm will veer round to the northwest before making landfall south of Shanghai after three days.

Philippines warnings
NONE at present

TROPICAL DISTURBANCE UPDATE
EASTERN PACIFIC OCEAN 
Update from NHC at 1800 GMT
System 90E
Position 11.7N 130.6W
Location 1450 miles SW of the southern tip of Baja California
Likelihood of tropical cyclone formation within 48 hours is LOW (20%)
Likelihood of tropical cyclone formation within 5 days is LOW (30%)

System No Invest Assigned
Position 9N 109W
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 5 days is MEDIUM (60%)

NORTHWESTERN PACIFIC OCEAN
Update from JTWC at 2100 GMT
System 96W
Position 11.1N 146.0E
Location 148 miles SE of Guam
Likelihood of tropical cyclone formation within 24 hours is LOW

System 98W is now 13W

NORTHERN INDIAN OCEAN
Update from JTWC at 1800 GMTSystem 96B
Position 20.0N 88.9E
Location 210 miles SW of Chittagong, Bangladesh
Likelihood of tropical cyclone formation within 24 hours is LOW