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Issued: Sep 23, 2010 02:00 am HST

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

1. The center or trough of low pressure located about 515 miles south of Oahu continued to move west at a little under 10 miles an hour over the past 6 hours. Scatterometer data supports an elongated trough better than a low as such, and a more southerly position for the feature as well. Still, the area of greatest interest is located right at the edge of the satellite pass, so this data must be used with caution. Thunderstorms from the east flank of the low spread rapidly along its north edge, reducing the amount of separation between the hypothetical low center and the deep convection. These thunderstorms have increased in coverage and intensity over the past 6 hours as well. Slow development of this feature is possible as it continues moving toward the west at about 10 mph during the next couple of days. With little shear to trouble this system, it has a medium chance, 30 percent, of becoming a tropical cyclone during the next 48 hours.

Otherwise, no tropical cyclones are expected through late Friday night.

Graphical Tropical Weather Outlook


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List of Central Pacific Outlooks (June 2010-present)