Hawaiian Islands Satellite Interpretation Message
Thu, 16 Dec 2010 23:30:00 -0600
Based on data through 0500 UTC December 17 2010.
Localized low cloud decks that developed over the islands with daytime heating are now beginning to gradually dissipate, but an area of broken to overcast cumulus /cu/ and stratocumulus /sc/ is over waters south of the islands, moving toward the northwest and west.
Scattered to broken cu and sc over north and east sides of Kauai are spreading over adjacent waters while gradually dissipating, while scattered to broken wispy cirrus elements are moving over the island from the west. Broken sc over the north, east and central portions of Oahu are drifting toward the northeast over adjacent waters this evening, with broken to overcast sc extending about 60 miles offshore. These clouds are in the process of diminishing rapidly as an apparent gravity wave sweeps westward. Maui county is dominated by mostly clear skies this evening, with a few exceptions, where skies are partly to mostly cloudy under scattered to broken sc and cu. These cloudier locations include the interior portions of Lanai, the slopes of eastern Molokai, and the east facing lower slopes of Haleakala on Maui. The northern portion of the Big Island is also mostly clear, with broken to overcast sc and cu over the lower Kona and Kau slopes. Nearly clear skies prevail over east Hawaii near Cape Kumukahi, with broken sc over the slopes above Hilo.
An extensive and persistent, northeast to southwest oriented, area of layered clouds, with embedded thunderstorms, lies west of the islands, from about 7°N to 30°N, between 160°W and 180. This area of deep convection is associated with an elongated trough aloft, that has an axis along a line from 30°N 176°W to 20°N 180° to 10°N 175°E with it's southwest terminus near 05°N 170°E. South and southwest flow through the depth of the atmosphere is resulting in this large area of clouds and precipitation to the east of this trough. Wisps of high level cirrus clouds, associated with the trough, are moving over the islands, but are thin enough to have little impact on the island's total sky cover. Water vapor imagery also highlights a compact low aloft centered about 375 miles of the big island's South Point, that has been nearly stationary for the past 8 hours.
A northwest to southeast oriented area of broken to overcast sc and showery cu, and isolated towering cu, is over waters south of the islands, primarily from 14°N to 20°N between 157°W and 160°W. While southern portions of this area of moisture are moving toward the west, the northern portions are moving toward the northwest, carried by the low-level winds. Isolated thunderstorms are developing east of this area, from 13°N to 15°N between 149°W and 154°W, and are associated with the low aloft discussed above. Near the islands, low clouds motions are generally toward the northwest.
BIRCHARD
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