Hawaiian Islands Satellite Interpretation Message
Sun, 19 Sep 2010 07:30:00 -0500
Based on data through 1200 UTC September 19 2010.
Cloud cover around the main Hawaiian islands has increased considerably since last evening since the remnant of a front is moving over the islands from the northeast.
Clouds are isolated over Niihau and Lanai. Broken to overcast low clouds cover windward areas from Kauai to Maui, and some of the low clouds are spreading over central Kauai and Oahu and completely across Molokai. Overcast low clouds cover the coast and lower slopes of the Big Island of Hawaii from Upolu Point to Hilo to Apua Point, and from Milolii to Kailua town. Skies are clear elsewhere on the Big Island.
Low clouds near the main Hawaiian islands are moving from the northeast around 20 mph. There are showery broken to overcast low clouds upstream of all of the islands.
A band of showers along the trailing end of a front is moving over the main Hawaiian islands from the northeast. The band lies north of a line from 60 miles southwest of Kauai, over the islands from Kauai to the Big Island, to 20°N 150°W, to 23°N 140°W. The part of the band over the main Hawaiian islands is about 150 miles wide, while the part northeast of the islands is around 200 miles wide. The band contains a mix of stable stratocumulus clouds and showery cumulus clouds with tops to 9000 ft. The part of the band over the islands has been moving toward the southwest at 15 to 20 mph, while the part northeast of the islands has been moving toward the south around 10 mph.
The shower area that moved over the main Hawaiian islands Friday night through Saturday afternoon persists as a 200 mile wide area of overcast low clouds centered along a line from 300 miles southwest of Kauai to 24°N 168°W. This cloud area has been moving toward the west at 20 mph.
West of Johnston islands is a 150 mile wide band of showery overcast low clouds, scattered towering cumulus clouds, tcu, and isolated cumulonimbus clouds, cb, in the shape of an upside-down v. The band is centered from 17°N 137°W to 19°N 177°W to 17°N 180°W. This band has been moving toward the west at 20 to 25 mph.
There is an unusual double cloud band in the deep tropics south of the Hawaiian islands. A band of broken layered clouds, scattered tcu, and isolated cb lies south of a line from 10°N 140°W to 10°N 170°W. The band is between 400 and 500 miles wide. The most active cb are between 144°W and 150°W and may be associated with a weak low. A 200 to 250 mile wide band of showery broken low clouds and scattered tcu is centered from 14°N 140°W to 14°N 165°W.
Water vapor imagery, which shows features mainly above 24000 ft, shows a cyclone aloft about 850 miles northeast of the main Hawaiian islands near 29°N 146°W. A trough extends southwest from the low to 24°N 148°W. An anticyclone aloft is centered 357 miles west northwest of Kauai near 25°N 167°W.
DONALDSON
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