Hawaiian Islands Satellite Interpretation Message
Wed, 10 Nov 2010 23:30:00 -0600
Based on data through 0500 UTC November 11 2010.
An upper trough west of the main Hawaiian islands has an axis extending through 31°N 163°W and 04°N 180°W. An area of broken to overcast high clouds south and east of a line from 11°N 170°W to 20°N 163°W to 24°N 158°W to 14°N 146°W marks the eastern flank of the trough. These high clouds are affecting the main Hawaiian islands this evening, blocking the view of low clouds there.
Isolated cumulonimbus, CB, embedded within broken layered clouds form a ragged 180 mile wide band north of a line from 07°N 140°W to 08°N 160°W to 04°N 170°W to 04°N 180°W. Between 170°W and 146°W, this cloud band is merged with the area of high clouds mentioned previously.
A ragged 180 to 240 mile wide band of broken layered clouds lies north of a line from 25°N 163°W to 31°N 150°W to 33°N 145°W. This feature, marking a frontal boundary, continues northeastward as a band of scattered to broken high clouds north of a line from 33°N 145°W to 34°N 140°W then beyond toward the mainland. This band has not moved much over the past 12 hours.
Overcast layered clouds north and west of a line from 33°N 180°W to 30°N 172°W to 42°N 154°W mark another frontal boundary. Movement is toward the east at 40 mph near 40°N.
Satellite loop shows a broad anticyclonic circulation at low cloud level south of the first frontal band. The main Hawaiian islands lie near the western edge of this circulation, with embedded low clouds slipping beneath the high cloud cover a hundred miles or so east of Maui and the Big Island. Using gaps in the high clouds in older visible imagery as a guide, it seems that low clouds are rather sparse across leeward portions of Kauai and Oahu. The windward third of Oahu had broken low clouds. Broken to overcast low clouds also covered windward Haleakala slopes on Maui as well as windward west slopes. High clouds are too thick, and have been too thick since late afternoon, to assess low cloud coverage.
POWELL
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