Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sat, 04 Sep 2010 19:30:00 -0500

Based on data through 0000 UTC September 05 2010.

Broad high pressure centered far north northeast of the area is generating low level trade winds across region, while a weak, but complex, pattern aloft is found over the central north Pacific.

A vast field of scattered to locally broken stratocumulus clouds and shower-bearing cumulus clouds is found near the main Hawaiian islands and across waters east to 140°W and north to 30°N. Individual low cloud motions near the state are from the east northeast at 17 to 23 mph.

Low cloud coverage is following a typical trade-wind pattern over the islands this afternoon, with a greater amount of low clouds observed over and east of the Big Island. As a result, broken low clouds cover windward slopes of the Big Island from Volcano to Upolu Point. Day time sea breezes have led to the development of broken to overcast low clouds over nearly all leeward slopes as well as windward Kau. Patches of broken low clouds are confined to windward slopes on the smaller islands, while adjacent waters are dominated by only scattered low clouds. Few to scattered low clouds are found over leeward areas, although a small area of broken low clouds covers the leeward slopes of Haleakala on Maui.

Subsidence aloft seen in water vapor imagery is producing rather stable conditions over the main Hawaiian islands, while a nearly stationary upper level trough sits 750 miles to the northwest of Kauai. An upper level low embedded in the upper trough near 24°N 178°W is travelling to the west around 15 mph. Isolated thunderstorms present under the upper low this morning have dissipated, leaving towering cumulus cells which rise as high as 26 kft.

To the south of the state, two separate portions of the ITCZ contain active convection north of 10°N. Isolated thunderstorms rise as high as 50 kft south of 13°N in the area east of 148°W and in the area west of 177°W.

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DWROE

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