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Issued: Aug 19, 2013 02:00 am HST

For the central north Pacific, between 140°W and 180.

1. Tropical storm Unala has moved west of the international date line, and is now located over the northwest Pacific ocean about 850 miles east southeast of Wake Island. Unala is moving toward the west at about 20 mph. For additional information on Unala, see bulletins issued by the regional meteorological center in Tokyo Japan. For u.s. Interests, see department of defense warnings issued by the joint typhoon warning center in Honolulu, Hawaii.

2. Showers and thunderstorms associated with a disturbance located about 970 miles west southwest of Lihue, Hawaii are moving west northwestward at about 10 mph. Strong thunderstorms remain concentrated near an apparent low level circulation center. Upper level winds have become somewhat weaker over this area tonight, which may allow some slow development during the next day or two. This system has a medium chance, 30 percent, of becoming a tropical cyclone during the next 48 hours.

3. Showers and thunderstorms associated with an elongated surface trough located about 750 miles southeast of Hilo, Hawaii have increased in coverage and intensity during the past several hours. Strong upper level winds are expected to inhibit significant development within this area today as it at moves toward the west northwest at 10 to 15 mph. However, the winds aloft may weaken somewhat by late tonight or early Tuesday, which may be slightly more conducive for development on Tuesday. This system has a low chance, 20 percent, of becoming a tropical cyclone during the next 48 hours.

Elsewhere, no tropical cyclones are expected through late Tuesday night.

Graphical Tropical Weather Outlook


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List of Central Pacific Outlooks (June 2010-present)