Hawaiian Islands Satellite Interpretation Message
Sun, 31 Oct 2010 19:30:00 -0500
Based on data through 0000 UTC November 1 2010.
Low cloud coverage has increased over the leeward areas of most islands since this morning, with the greatest increase over leeward Big Island. Meanwhile, little significant change in windward low cloud coverage has occurred since this morning.
Light to moderate trade winds continue to push scattered to broken showery cumulus /cu/ elements toward the west over waters east of the Big Island, while few to scattered low clouds are over near shore windward waters east of the other islands. As is typical in trade wind flow, daytime heating and sea breezes have led to the formation of broken to overcast low clouds over the leeward slopes of the Big Island. With broken low clouds, primarily stable stratocumulus /sc/, over the windward and Kau slopes, most of the Big Island, save the nearly clear summits, is under mostly cloudy skies. Broken sc and cu line the lower slopes of Haleakala on Maui, with broken low clouds spreading from Haleakala, and over leeward waters between Maui and Kahoolawe. Scattered to broken cu are over the lower windward slopes of the west Maui mountains, but the central valley and leeward west Maui are under mostly sunny skies. Scattered cu dot interior portions of Lanai, and the northeast and southwest portions of Molokai, but the remainder of Maui county is mostly sunny. On Oahu, low cloud cover over the summits of the Koolau range has changed little since this morning, with a narrow ribbon of scattered to broken cu persisting. Broken low clouds are now over the Waianae range, and are currently making for partly to mostly cloudy conditions over Kapolei and Barbers Point. The remainder of Oahu is under mostly sunny skies. Coastal areas on Kauai are mostly sunny, with few to scattered cu and sc over the interior of the island. Wispy high clouds have been on the increase over the last couple of hours, and are likely giving skies over Kauai a bit of a milky texture.
While an area of showery cu has prevailed over waters east of the Big Island since this morning, and a few of those showers did move ashore over windward Big Island, the bulk of the moisture has remained offshore over the course of the past 6 hours. This area of showery open-celled cu extends about 200 miles east of the Big Island, and about 225 miles east from windward east Maui. Low cloud motion continues to be toward the west, at speeds near 15 mph.
The high clouds near Kauai, and to a lesser extent, Oahu, are developing in association with a nearly stationary compact low aloft that is centered about 850 miles west of Kauai, near 23°N 173°W. Broken to overcast high clouds are forming within the diffluent flow aloft on the southeast flank of the low, but most of the cirrus are dissipating before moving over the islands, where a north-south oriented ridge aloft is in place along 160°W.
Isolated thunderstorms lack significant organization within the near equatorial trade wind convergence zone south and southwest of the islands, and are most concentrated from 6°N to 11°N between 150°W and 173°W.
BIRCHARD
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