Hawaiian Islands Satellite Interpretation Message
Sat, 18 Sep 2010 00:30:00 -0500
Based on data through 0500 UTC September 18 2010.
The center of a deep layered high, about 500 miles north-northwest of Oahu, is clearly seen on regional visible imagery this evening, with this high providing the Hawaiian islands with a moderate to fresh trade wind flow. Aside from a clump of broken to overcast stable stratocumulus /sc/ over waters to the northeast of Kauai and Oahu, few to scattered low clouds prevail over windward waters. Radar is not currently detecting any showers over windward waters, with narrow shower lines noted within the low cloud plumes streaming west-southwestward from the islands of Kauai, Oahu and Molokai.
The leading edge of a clump of low clouds over waters northeast of the islands is about 60 to 70 miles northeast of Kauai and Oahu, and about 110 miles northeast of windward Maui. This clump is dominated by sc, but isolated showery cumulus /cu/ elements are embedded in this clump that extends about 350 miles east to west and 150 miles north to south. With low clouds to the northeast of the islands moving toward the southwest, and those to the west moving toward the west, this clump of low clouds appears to be moving on a trajectory that would bring it over Kauai and Oahu later tonight, and to a lesser extent the islands of Maui county. Low clouds are moving at speeds near 22 mph.
The cloudiest island area this evening appears to be the leeward side of the Big Island, where broken to overcast low clouds linger from daytime heating. Windward slopes of Kauai and Oahu have scattered to broken sc and cu, but coastal areas have few to scattered low clouds overhead.
Water vapor imagery shows a high aloft centered to the northwest 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 142°W to near 22°N 150°W.
Scattered thunderstorms within the near equatorial trade wind convergence zone lack significant organization, although several weak low cloud swirls are embedded. The best developed low cloud swirl is located about 950 miles southeast of the Big Island, and has been spawning bursts of thunderstorms over the past couple of days, but the weak low has remained within the convergence zone, which appears to be hindering additional development.
BIRCHARD
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