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Issued: Aug 18, 2013 08:00 am HST

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

1. Showers and thunderstorms associated with a surface trough located about 1120 miles west southwest of Lihue, Hawaii are moving westward at 10 to 15 mph. Little significant development of this system is expected due to its close proximity to the outflow from tropical storm Pewa, which crossed the dateline yesterday and has been creating unfavorable winds aloft above the system. This system has a low chance, 20 percent, of becoming a tropical cyclone during the next 48 hours.

2. Showers and thunderstorms associated with another surface trough located about 650 miles southwest of Lihue, Hawaii are moving westward at 10 to 15 mph. Thunderstorms have decreased over the past few hours and little significant development of this system is expected due to strong upper level winds over the surface trough. This system has a low chance, 10 percent, of becoming a tropical cyclone during the next 48 hours.

3. Showers and thunderstorms associated with a weak disturbance located about 1100 miles east southeast of Hilo, Hawaii have increased in coverage and intensity overnight. Little significant development of this system is expected as this disturbance moves west northwest at 10 to 15 mph during the next 24 to 36 hours due to very strong southerly winds over the system. However, the upper level winds may relax slightly by late Monday, and this system has a low chance, 10 percent, of becoming a tropical cyclone during the next 48 hours.

Elsewhere, no tropical cyclones are expected through Tuesday morning.


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List of Central Pacific Outlooks (June 2010-present)