Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sat, 18 Sep 2010 07:30:00 -0500

Based on data through 1200 UTC September 18 2010.

While low cloud coverage, and motions, help to outline the position of a deep layered high that is centered about 450 miles north-northwest of Oahu, the westward movement of the high is allowing a deep layered trough to dig south and southeast over waters far northeast of the islands.

Low cloud cover over the island's near shore waters has increased since sundown Friday, while the distinct clump of broken to overcast low clouds northeast of Kauai and Oahu has become increasingly diffuse. Low cloud coverage over windward waters is uniformly broken to overcast upstream of all islands, with stable stratocumulus /sc/ prevailing, although some showery cumulus /cu/ are most certainly embedded, based on radar detecting scattered showers currently in the vicinity of Kauai and Oahu. The broken low clouds extend up to 120 miles to the northeast of all islands, with a distinct break in low cloud cover beyond that point. Low clouds near the islands are moving toward the west-southwest at speeds between 25 and 28 mph.

With the increase in low cloud cover over windward waters, windward sides of the islands are mostly cloudy this morning, with broken low clouds spreading over to leeward areas on both Kauai and Oahu as well. Broken low clouds are also noted over the leeward lower slopes and near shore waters of the Big Island, primarily between Kailua-Kona and Milolii. Leeward areas of Maui county appear to be mostly clear.

Water vapor imagery shows a high aloft centered to the west of the islands, with a northeast flow aloft over the islands as a result. A weak trough exists downstream, or to the east of the high, and is to the northeast of the islands, along a line from 30°N 144°W to near 23°N 150°W.

Scattered thunderstorms within the near equatorial trade wind convergence zone south of the islands, from 7°N to 12°N between 140°W and 180, lack significant organization.

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BIRCHARD

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