Hawaiian Islands Satellite Interpretation Message
Thu, 30 Sep 2010 00:30:00 -0500
Based on data through 0500 UTC September 30 2010.
Water vapor images showed a broad area of low pressure in the upper atmosphere centered near 26°N 176°W. Isolated thunderstorms developed under the low center, producing middle to high debris clouds that partly to mostly obscured lower features west of the curve from 25°N 180 to 28°N 177°W to 25°N 174°W to 20°N 180. The low and its associated clouds drifted west slowly.
A dissipating band of clouds associated with a weakening front extended across Hawaiian waters within 120 miles of the curve from 28°N 180 to 28°N 177°W to 22°N 155°W to 22°N 151°W to 30°N 140°W and further northeast. This feature consisted mostly of fragmented low to middle cloud layers. Different parts of it moved in different directions, with the northwest end drifting west slowly, and the central part flowing south slowly. Stratocumuli merging into clumps or bands parallel to the main frontal cloud band prevailed between it and 30°N.
To the south, light thunderstorm activity continued in the ITCZ between 17°N and 07°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 mostly obscured lower features from 19°N to 05°N, and partly obscured lower features as far north as 25°N, especially to the west of 170°W.
Otherwise, cloud cover across Hawaiian waters consisted mainly of loose bands or clumps of marine stratocumuli and cumuli near 21°N 170°W, and near 22°N 143°W. These clumps varied in size from individual small cumuli up to features about 200 miles long and 90 miles across. They generally rose to heights of 8000 to 10000 feet, and remained nearly stationary.
Across the main Hawaiian islands, cloud cover consisted mostly of stratus layers associated with the frontal cloud band moving ashore along north slopes, although afternoon cumulus buildups and their layered debris clouds were important as well over higher terrain inland, especially over slopes facing south through west. Areas with the least cloud cover were limited mainly to the central isthmus of Maui, the west coast of north Kohala district on the Big Island, the summits of Mauna Kea and Mauna Loa on the Big Island, and the coast of south Hilo, Puna, and Kau districts on the Big Island. These clouds varied considerably in height from 3000 feet to 12000 feet, though the layered clouds associated with the frontal cloud band more uniformly approached the higher end of that range. Radar data from near the islands showed areas of rain within a region 100 miles wide stretching from west of Niihau across south Kauai, Oahu, and north parts of Maui county, but little precipitation otherwise.
RYSHKO
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