Hawaiian Islands Satellite Interpretation Message
Tue, 21 Sep 2010 19:00:00 -0500
Based on data through 2330 UTC September 21 2010.
Skies are sunny to partly cloudy over most of the aloha state this early afternoon. On the other hand, broken to overcast low clouds have been forming over the mountain slopes in Kau, Kona, south Kohala, windward north Kohala and Hamakua on the Big Island as of bulletin time. Low ceilings have also been developing on the north- and west-facing slopes of Haleakala in east Maui. Low cloud motion is from the east to east-northeast at 15 to 20 mph across the island chain.
Scattered to occasionally broken low clouds, with embedded showers, exist immediately north clockwise through south of the Big Island, and just east of Maui. These elements are remnants from an old frontal boundary. Conditions are clear to scattered elsewhere in the adjacent coastal waters.
Most of the remnant moisture from the old front, as alluded to above, is farther to the east and northeast of the Big Island, and is currently within 85 miles either side of a line from 26°N 135°W to 24°N 146.5°W to 19.5°N 153.5°W.
The axis of a weak northeast-to-southwest oriented upper trough, above 25 thousand feet, is nearly stationary along a line from 30°N 146°W to 26.5°N 150°W to 23°N 158°W to just over the Kauai channel to 20°N 160°W. Another upper trough, far northwest of Kauai and oriented north to south, has become nearly stationary. Its axis is along a line from 30°N 170°W to 24°N 169°W. An upper ridge exists between the troughs, and an area of broken high clouds has formed on the southeast flank of the ridge. Most of this cloudiness is located from 27°N to 33°N between 148°W and 158°W.
A weak vortex, or counterclockwise-rotating circulation, is more than 500 miles south-southeast of Hilo and has been moving west near 10 mph. The feature, igniting showers and thunderstorms, has shown increasing organization over the past six hours. More development of the system is possible as it heads west.
Along the intertropical convergence zone, convection has been firing from 08°N to 11°N east of 163°W, and from 06.5°N to 10°N west of 166°W.
KINEL
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