Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Fri, 22 Oct 2010 07:30:00 -0500

Based on data through 1200 UTC October 22 2010.

Since last evening clouds have decreased over the main Hawaiian islands but increased over water around the islands.

Clouds have become isolated over most areas from Niihau to Maui but there are small patches of broken low clouds over the windward slopes. Radars show only isolated light showers over windward areas except for a few moderate showers over windward east Maui. Skies are clear over most of the Big Island of Hawaii with patchy scattered to broken low clouds along the windward coast from Pepeekeo to just south of Hilo town and from Keahole Point to Upolu Point.

Low clouds east of the Big Island are moving from slightly north of east at 10 to 15 mph. The low level flow veers to east southeast off the windward sides of the islands from the Big Island to Molokai, then backs to east northeast at 10 mph around Oahu and Kauai. Low level flow south of the Big Island continues from slightly north of east at 15 mph. Low clouds are isolated northeast of the islands from the Big Island to Oahu. There are scattered to broken low clouds over the coastal waters southwest of Lanai, southwest of Oahu and south of Kauai and over the Kauai channel. Radars show scattered moderate showers falling from these lines.

Some remnants of an old frontal band remain north of the main Hawaiian islands, north of 25°N between 140°W and 158°W. These areas of low clouds have become a series of poorly defined bands that have stretched out from west southwest to east northeast ahead of a newer frontal band. Features north of the main Hawaiian islands are partly obscured by scattered to broken high, cirrus, clouds.

Water vapor imagery shows a trough aloft from 25°N 140°W, over the Big Island to 15°N 180°E. The trough has been nearly stationary for the past several hours. A jet stream associated with the trough runs from 18°N 180°W to 19°N 175°W to 18°N 160°W to 23°N 140°W. There are broken to overcast cirrus clouds southeast of the jet.

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DONALDSON

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