Hawaiian Islands Satellite Interpretation Message
Fri, 24 Sep 2010 19:30:00 -0500
Based on data through 0000 UTC September 25 2010.
An area of broken to overcast low clouds is moving west across the islands of Maui county and is poised to reach Oahu within the hour. In the meantime, daytime heating has increased cloud cover across the Big Island. Scattered to broken low clouds cover windward Big Island slopes, while broken to overcast low clouds dominate leeward and Kau slopes. Kauai has scattered low clouds, while sky cover across windward Oahu has become broken to overcast. Molokai and Lanai have broken low clouds, while leeward Haleakala and all windward west slopes on Maui have broken low clouds. Skies are much clearer immediately upwind from Maui, so that island should see clearer skies shortly.
Satellite loop shows the subtropical ridge extends roughly through 30°N 140°W, 26°N 160°W and 26°N 170°W. Trade flow along the southern flank of the ridge is rather sluggish west of 150°W, with low clouds moving west at 10 to 15 mph across the main Hawaiian islands. Farther to the north, a 90 to 150 mile wide band of broken to overcast layered clouds extends north and west of a line from 41°N 140°W to 35°N 150°W to 32°N 160°W to 32°N 170°W to 33°N 180°W. Marking a frontal boundary, this cloud band is moving toward the east at 30 to 40 mph along 40°N. Movement is more toward the southeast and south at 10 mph or less west of 160°W.
To the south, isolated cumulonimbus, cb, mark the intertropical convergence zone within a 120 mile wide arc from 08°N 140°W to 08°N 160°W to 09°N 160°W to 12°N 170°W to 09°N 180°W. A weak tropical disturbance near 13.2°N 163.2°W is moving west southwest at about 10 mph. A single cb persists just northeast of the center of circulation.
POWELL
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