Hawaiian Islands Satellite Interpretation Message
Wed, 29 Sep 2010 07:30:00 -0500
Based on data through 1200 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 28°N 174°W to 26°N 174°W to 22°N 177°W to 24°N 180 to 27°N 178°W. The low and its associated clouds drifted west slowly.
A cloud band associated with a weakening front spread out as it dissipated slowly north of the main Hawaiian islands. This feature extended across Hawaiian waters within 120 miles of the curve from 28°N 178°W to 29°N 176°W to 24°N 160°W, within 150 miles of the curve from 24°N 160°W to 23°N 151°W to 27°N 145°W, and within 45 miles of the curve from 27°N 145°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. Cold-air cumuli merging into clumps or bands parallel to the main frontal cloud band prevailed between it and 30°N.
To the south, light to moderate thunderstorm activity continued in the ITCZ between 17°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 17°N to 05°N, and partly between 20°N and 01°N.
Otherwise, cloud cover across Hawaiian waters consisted mainly of loose bands or clumps of marine stratocumuli and cumuli near 20°N 170°W, and within 250 miles of the line from 12°N 151°W to 22°N 140°W. These clumps varied in size from individual small cumuli up to about 120 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 stratus layers associated with the frontal cloud band moving ashore along north slopes of Oahu. Layered debris clouds from afternoon cumulus buildups on Tuesday had dissipated for the most part, except along lower southwest slopes of south Kona and Kau districts on the Big Island. These clouds varied considerably in height from 3000 feet to 10000 feet. Radar data from near the islands showed scattered showers offshore well north of Maui county, isolated showers offshore well north of Oahu, and isolated showers offshore in the lee plume to the west of the Big Island, but little precipitation otherwise.
RYSHKO
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