25 July 2017 - bulletin 421

Updated at 1500 GMT
Latest warnings for 07E, 09E, 10E, 07W and 09W
Disturbance update


EASTERN PACIFIC OCEAN
Tropical storm Greg / 07E
Warning 33 from NHC at 1500 GMT
Position 15.4N 136.8W
Location 1270 miles E of South Point, Hawaii
Movement 295° (WNW) at 9 knots
Maximum sustained winds 35 knots gusting to 45 knots
Winds of 34 knots or higher occur within 70 miles of the centre
Minimum central pressure: 1005 mbar
Threatened landmasses NONE
Next warning from NHC at 2100 GMT

Greg is moving westnorthwest, later west, and is expected to slowly weaken. The storm will dissipate after a day or so, near 140W.

HURRICANE Hilary / 09E
Warning 17 from NHC at 1500 GMT
Position 15.3N 107.8W
Location 540 miles SSE of the southern tip of Baja California, Mexico
Movement 285° (WNW) at 10 knots
Maximum sustained winds 90 knots gusting to 110 knots
Winds of 34 knots or higher occur within 70 miles of the centre
Winds of 64 knots or higher occur within 15 miles of the centre
Minimum central pressure: 975 mbar
Threatened landmasses NONE
Next warning from NHC at 2100 GMT

Hilary will move generally westnorthwest. The system will intensify a little, to 100 knots. A weakening trend will commence after tomorrow. The storm could show some interaction with Irwin (see below) late in the forecast period.

HURRICANE Irwin / 10E
Warning 13 from NHC at 1500 GMT
Position 15.6N 119.4W
Location 800 miles SW of the southern tip of Baja California, Mexico
Movement 270° (W) at 5 knots
Maximum sustained winds 70 knots gusting to 85 knots
Winds of 34 knots or higher occur within 90 miles of the centre
Winds of 64 knots or higher occur within 15 miles of the centre
Minimum central pressure: 986 mbar
Threatened landmasses NONE
Next warning from NHC at 2100 GMT

Irwin will move westsouthwest, maintaining current strength. Interaction with Hilary will cause gradual weakening, and causeing the cyclone to stall, then head away northwest.

NORTHWESTERN PACIFIC OCEAN

TYPHOON Noru / 07W
Warning 20 from JTWC at 1500 GMT
Position 26.2N 158.2E
Location 258 miles ENE of Minami Tori Shima, Japan
Movement 060° (ENE) at 6 knots
Maximum sustained winds 80 knots gusting to 100 knots
Winds of 34 knots or higher occur within 100 to 130 miles of the centre
Winds of 64 knots or higher occur within 20 miles of the centre
Threatened landmasses NONE
Maximum significant wave height 26 feet
Next warning from JTWC at 2100 GMT

Noru is moving east on its loop motion that will occur over the next few days. The system will maintain current strength for a day or so, before weakening as it once more travels southwest.

Tropical depression Kulap / 09W

Warning 18 from JTWC at 1500 GMT
Position 32.4N 153.6E
Location 492 miles N of Minami Tori Shima, Japan
Movement 255° (WSW) at 11 knots
Maximum sustained winds 30 knots gusting to 40 knots
Threatened landmasses NONE
Maximum significant wave height 10 feet
Next warning from JTWC at 2100 GMT

Kulap will move west but will weaken and dissipate later today as it is being absorbed by Noru.

TROPICAL DISTURBANCE UPDATE
NORTHWESTERN PACIFIC OCEAN
Update from JTWC at 1200 GMT
System 99W
Philippines designation Gorio
Position 13.5N 128.9E
Location 466 miles E of Manila, Philippines
Likelihood of tropical cyclone formation within 24 hours is now HIGH

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