Hawaiian Islands Satellite Interpretation Message
Tue, 11 Jan 2011 23:45:00 -0600
Based on data through 0500 UTC January 12 2011.
A complex weather pattern has led to a myriad of cloud types near the Hawaiian islands this evening, with broken to overcast high clouds spreading over the region from the northwest making it increasingly difficult to identify low cloud features. Isolated pockets of colder cloud tops, indicative of deep convection and thunderstorms, are evident on regional imagery, located over Big Island windward waters, and over water about 300 miles south of Niihau. The tops of these thunderstorms, reaching as high as 40000 thousand feet, are being blown southeastward, by the west- northwest flow aloft.
An area of broken to overcast low clouds, oriented east to west, and marking remnant moisture associated with the front that affected the islands yesterday, is over leeward waters south of the islands, and is moving northward in an increasing southerly low level flow. It is within this band of moisture that the the thunderstorms mentioned above are developing.
A larger view of the central north Pacific indicates that the high clouds overspreading the islands from the northwest are associated with a surface front, and associated trough aloft, that are located to the northwest of the islands, and heading east and southeast. The approaching deep layer trough is responsible for the increasing southerly flow noted over the islands, and waters to the west. Water vapor imagery shows a sharpening trough aloft moving east at 40 to 45 mph supporting the surface front, with the trough and front along a line from 30°N 169°W to 24°N 173°W to 21°N 180°W.
BIRCHARD
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