Hawaiian Islands Satellite Interpretation Message
Sat, 04 Dec 2010 23:30:00 -0600
Based on data through 0500 UTC December 05 2010.
Water vapor imagery was showing an upper level low far northeast of the state near 33°N 135°W. An upper trough extended from the low to just east of the Big Island to near 17°N 158°W. The southwest end of the trough near the state was moving southeast near 15 miles an hour. The upper low was moving more slowly southeastward.
An upper ridge extended roughly from 18°N 165°W to 30°N 171°W. With this ridge just to our west and the upper trough axis east of the state, the air mass around the islands tended to be on the dry and stable side.
An upper trough just beyond the dateline extended from from 19°N 177°E to 30°N 173°E. This upper trough was producing unstable weather in the way of isolated thunderstorms from 16°N to 29°N between 173°W and 176°E. The trough has been nearly stationary over the past 24 hours.
A weakening surface high pressure area just north-northeast of the state this evening was guiding tightly bunched patches of mostly scattered low clouds into the state. These low clouds were moving west near 25 miles an hour. At 7 pm, most of these low clouds in the area were affecting the windward side of the Big Island and east Maui. To a lesser extent, the low clouds were finding their way onto mainly the east and north sides of the other islands. Few clouds were noted on the downwind side of the state except for a few narrow low cloud plumes that form lee of the mountains.
The upper level west to east winds between the Big Island and the ITCZ around 09°N were carrying strands of broken cirrus clouds eastward mainly from 10°N to 16°N east of 170°W. An insignificant amount of scattered to broken wisps of cirrus were noted immediately southwest and south of the Big Island.
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