Issued: Dec 05, 2016 8:30 AM HST
A deep trough at the surface and aloft dominates over the central portion of the area, including the main Hawaiian islands. A shortwave upper level trough axis currently located between Kauai and Oahu and is lifting northeastward at 25 to 30 mph, while a broader longwave upper level trough covers the area from the islands to just west of the dateline.
The shortwave upper trough is generating a 400 to 500 mile wide shield of broken to overcast layered clouds with isolated embedded thunderstorms over the eastern half of the island chain and across waters to the northeast beyond 30°N. The most active portion of this cloud shield is moving northeast with the shortwave trough. This feature has also tapped deep tropical moisture, bringing a large area of scattered to broken layered clouds between 10°N and the Big Island. A line of low level convergence is producing scattered thunderstorms to the east and southeast of the Big Island within 125 miles of a line from 19°N 152°W, 15°N 151°W, and 10°N 146°W.
Across the main Hawaiian islands, infrared imagery shows an area of active embedded showers poised to move northeast of the Big Island and Maui. As a result, broken to overcast layered clouds dominate over these islands, with overcast low clouds noted over Molokai. The first visible images of the day reveal scattered cumulus clouds over waters around Kauai and Oahu. Rather slow low cloud motions suggest a surface trough near and north of Oahu.
Across the rest of the region, a trade wind flow dominates, with the exception of a weak surface trough sitting over Midway atoll.
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