Hawaiian Islands Satellite Interpretation Message
Tue, 04 Jan 2011 06:30:00 -0600
Based on data through 1200 UTC January 04 2011.
A generally stable weather pattern resides over the area as an upper level ridge axis stretches east west across the area along 22°N latitude. Dry air aloft is seen on water vapor imagery along this axis and points south to near 15°N as strong subsidence keeps showery clouds to a minimum. A weakening upper level low is centered near 12°N 174°W, moving west at 25 mph with only a small plume of layered clouds and isolated embedded thunderstorms covering areas east of the low center south of 12°N west of 169°W. Patchy and mainly thin cirrus clouds are found further east of the upper low along an eastward moving upper level jet. These clouds are south of a line from 15°N 155°W to 16°N 140°W. Isolated thunderstorms with tops near 45000 feet are along the southern edge of the area near 10°N E of 145°W, associated with the intertropical convergence zone.
Another frontal cloud band is found in the extreme northwest corner of the area, covering the far northwest Hawaiian islands from Midway atoll to the dateline. This cloud band is nearly stationary and consists of mainly low topped stratocumulus and isolated towering cumulus to 20000 feet. Elsewhere across the central Pacific infrared imagery shows patches of broken low clouds moving west at 20 to 30 mph in the trades between the main Hawaiian islands and 140°W.
Over the main Hawaiian islands, in typical trade wind fashion, broken low clouds are located over windward Big Island from Apua Point north to Hilo and northwest to near Waipio valley, hugging the windward coast of Maui, over the Koolau mountains of Oahu and over the eastern half of Kauai. A small patch of low clouds also resides on the western coast of the Big Island from keahole airport south to a point 5 miles west of Milolii. A more significant band of showery low clouds is just east of the Big Island over the windward and southeastern coastal waters. Elsewhere over the coastal waters, few to scattered low clouds are found. Maximum cloud tops are generally 6000 feet but locally to 11000 feet to the east of the Big Island. Low cloud movement is to the west at around 25 mph in areas free of the terrain.
BRENCHLEY
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