Hawaiian Islands Satellite Interpretation Message
Sat, 15 Jan 2011 06:30:00 -0600
Based on data through 1200 UTC January 15 2011.
An area of overcast layered clouds bounded by a line from 37°N 140°W to 30°N 152°W to 35°N 155°W to 44°N 144°W to 37°N 140°W remains the most noticeable cloud feature across the central north Pacific. This cloud area extends east of 140°W to the us mainland. Merging with this cloud area is a 300 mile wide band of overcast layered clouds north of a line from 44°N 144°W to 35°N 170°W to 42°N 180°W. A ragged 300 mile wide band of broken to overcast layered clouds extends north and west of a line from 30°N 152°W to 26°N 160°W to 21°N 170°W to 19°N 180°W. This cloud band marks a cold front which is moving toward the southeast at 15 mph. Isolated cumulonimbus, CB, are embedded within the frontal cloud band north of 23°N. The leading edge of the frontal cloud band is about 270 miles northwest of Kauai.
Low clouds are rather sparse southeast of the frontal cloud band, including across local Hawaiian waters. A broad anticyclonic circulation, the subtropical ridge, is noted along an axis roughly along a line from 26°N 140°W to 22°N 154°W to 20°N 165°W. Cloud cover is generally scattered north of 10°N, southeast of the frontal cloud band, and west of 152°W. A field of broken stable low clouds has spread west to 152°W overnight. Water vapor loop shows a strong jetstream west of the frontal cloud band along 30°N, associated with a band of clearing and subsidence just west of the frontal cloud band.
The subtropical ridge lies across the main Hawaiian islands, with light to moderate easterly flow noted near the Big Island and light southerly flow noted near Kauai. A weak low cloud band extends south southwest from Kauai within an area of local low level convergence. Cloud tops are warm here and radar shows almost no associated shower activity. Broken low clouds cover the southwestern half of Kauai, while Oahu has scattered low clouds to clear skies. Patchy broken low clouds cover skies across the islands of Maui county. The Big Island has broken to overcast low clouds across windward slopes south from Hilo, wrapping southwest across Kau district, then scattered to broken skies up the Kona side from Milolii to Captain Cook. Broken low clouds are also noted across windward Kohala slopes.
POWELL
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