Hawaiian Islands Satellite Interpretation Message
Wed, 29 Sep 2010 00:30:00 -0500
Based on data through 0500 UTC September 29 2010.
Water vapor images showed a broad area of low pressure in the upper atmosphere centered near 23°N 174°W. Isolated towering cumuli and probable thunderstorms developed along the northwest through north edges of the low, producing plentiful middle to high debris clouds that mostly to partly obscured lower features within the curve from 27°N 178°W to 27°N 171°W to 23°N 175°W to 19°N 175°W to 21°N 180 to 26°N 178°W. The low and its associated clouds drifted west slowly.
A slowly dissipating band of clouds associated with a weakening front extended across Hawaiian waters within 100 miles of the curve from 26°N 180 to 29°N 174°W to 26°N 166°W to 25°N 160°W to 23°N 154°W to 28°N 143°W to 30°N 141°W and further north. This feature consisted mostly of middle to low cloud layers. Different parts of it moved in different directions, with the northwest end drifting west slowly, and the central and southeast parts flowing south at 5 to 10 miles an hour.
To the south, light to moderate thunderstorm activity continued in the ITCZ between 16°N and 06°N. Although several weak centers of low pressure were present in the ITCZ, they did not appear to be associated with persistent thunderstorm activity. Layered middle to high debris clouds from this and earlier convection obscured lower features mostly from 15°N to 05°N, and partly between 19°N and 02°N.
Otherwise, cloud cover across Hawaiian waters consisted mainly of loose bands or clumps of marine stratocumuli and cumuli within 100 miles of the line from 20°N 171°W to 22°N 164°W, and northeast of the curve from 29°N 140°W to 23°N 145°W to 20°N 153°W to 14°N 143°W to 17°N 140°W. These clumps varied in size from individual small cumuli up to about 200 miles across. They generally rose to heights of 8000 to 10000 feet, and moved toward the southwest to west slowly.
Across the main Hawaiian islands, cloud cover consisted mostly of afternoon cumulus buildups and their layered debris clouds over higher terrain inland. Areas with the greatest cloud cover included the northwest two thirds of Kauai, west central Oahu, inland Lanai, middle slopes of Haleakala on Maui, most middle slopes of the Big Island, and most lower slopes of the Big Island clockwise from Kau district to south Kohala district. These clouds varied considerably in height from 4000 feet to 10000 feet. Radar data from near the islands showed little precipitation.
RYSHKO
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