21 July 2017 - bulletin 409

Updated at 1500 GMT
Latest warnings for 06E, 07E, 07W, 08W and 09W
First warning for 09E
Disturbance update



CENTRAL PACIFIC OCEAN
Tropical storm Fernanda / 06E
Warning 39 from CPHC at 1500 GMT
Position 18.6N 143.6W
Location 755 miles E of Hilo, Hawaii
Movement 280° (W) at 10 knots
Maximum sustained winds 40 knots gusting to 50 knots
Winds of 34 knots or higher occur within 80 miles of the centre
Minimum central pressure: 1002 mbar
Threatened landmasses NONE
Next warning from CPHC at 1500 GMT

Fernanda will move westnorthwest, and is continuing to weaken. The system will cease to be a tropical cyclone within a day or so.

Hawaiian warnings
Large and potentially dangerous surf will affect east-facing shores of the main islands

Tropical storm Greg / 07E
Warning 17 from NHC at 1500 GMT
Position 15.1N 119.2W
Location 810 miles SW of the southern tip of Baja California, Mexico
Movement 285° (WNW) at 9 knots
Maximum sustained winds 50 knots gusting to 65 knots
Winds of 34 knots or higher occur within 70 miles of the centre
Minimum central pressure: 1001 mbar
Threatened landmasses NONE
Next warning from NHC at 2100 GMT

Greg will continue to move west and is expected to strengthen to 65 knots. After three days, the storm will weaken as it veers northwest.

Tropical depression 09E
Warning 01 from NHC at 1500 GMT
Position 9.0N 93.5W
Location 695 miles SE of Acapulco, Mexico
Movement 280° (WNW) at 12 knots
Maximum sustained winds 30 knots gusting to 40 knots
Minimum central pressure: 1008 mbar
Threatened landmasses NONE
Next warning from NHC at 2100 GMT

09E has formed and will move westnorthwest, later northwest. The system will steadily intensify, reaching 90 knots after five days.

NORTHWESTERN PACIFIC OCEAN

Tropical storm Noru / 07W
Warning 04 from JTWC at 1500 GMT
Position 27.9N 155.1E
Location 230 miles NNE of Minami Tori Shima, Japan
Movement 260° (W) at 7 knots
Maximum sustained winds 35 knots gusting to 45 knots
Winds of 34 knots or higher occur within 60 to 165 miles of the centre
Threatened landmasses NONE
Maximum significant wave height 14 feet
Next warning from JTWC at 2100 GMT

Noru will move west. As it interacts with tropical storm 09W, the track forecast becomes highly uncertain. 07W will intensify to 70 knots, before the aforementioned interaction, which will prompt a rapid weakening.

Tropical depression 08W
Warning 03 from JTWC at 1500 GMT
Position 18.0N 113.1E
Location 265 miles SSW of Hong Kong
Movement 290° (WNW) at 6 knots
Maximum sustained winds 30 knots gusting to 40 knots
Threatened landmasses Hainan Island, Vietnam
Maximum significant wave height 10 feet
Next warning from JTWC at 2100 GMT

08W will track across Hainan Island, then into northern Vietnam. The system will peak at 40 knots before reaching Hainan.

Tropical storm Kulap / 09W
Warning 02 from JTWC at 1500 GMT
Position 28.0N 176.3E
Location 745 miles NE of Wake Island
Movement 335° (N) at 17 knots
Maximum sustained winds 35 knots gusting to 45 knots
Winds of 34 knots or higher occur within 45 to 140 miles of the centre
Threatened landmasses NONE
Maximum significant wave height 12 feet
Next warning from JTWC at 2100 GMT

Kulap will move westnorthwest, whilst strengthening to 50 knots. It will approach tropical storm 07W (see above). The resulting interaction will likely slow down and weaken the system.

TROPICAL DISTURBANCE UPDATE
NORTHWESTERN PACIFIC OCEAN
Update from JTWC at 0600 GMT
System 98W
Position 18.1N 124.7E
Location 366 miles SE of Kaohsiung, Taiwan
Likelihood of tropical cyclone formation within 24 hours  is HIGH
System 99W
Position 6.0N 135.0E
Location 114 miles SE of Palau
Likelihood of tropical cyclone formation within 24 hours is MEDIUM

EASTERN PACIFIC OCEAN
Update from NHC at 1500 GMT
System 99E
Position 12.1N 108.6W
Likelihood of tropical cyclone formation within 48 hours is HIGH (70%)
Likelihood of tropical cyclone formation within 5 days is HIGH (80%)

System 90E is now 09E

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