Hawaiian Islands Satellite Interpretation Message
Tue, 21 Sep 2010 13:00:00 -0500
Based on data through 1730 UTC September 21 2010.
Skies are clear to partly cloudy across most of the island chain this morning. Low cloud ceilings are tending to concentrate over windward and mauka sections, especially in the Puna and Hilo districts on the Big Island. Low cloud movement is from the east to slightly north of east near 15 mph statewide.
Showery low clouds from an old front are generating ceilings just east clockwise through southwest of the Big Island, and to its northeast. This latter area of showery low cloudiness has been moving steadily toward Maui and the northern parts of the Big Island. Conditions are otherwise clear to scattered in the adjacent coastal waters.
Besides the old frontal remnants near the Big Island, more low clouds that had been associated with the front exist farther to the east and northeast of the state. Most of this cloudiness is currently within 100 miles either side of a line from 26.5°N 135.5°W to 24.5°N 141.5°W to 23.5°N 146.5°W to 20°N 152°W.
In the upper air above 25 thousand feet, a northeast-to-southwest oriented trough has become nearly stationary, and is along a line from 30°N 146°W to 26°N 150°W to 23°N 156°W to just over Oahu to 19°N 160°W. Two weak lows are embedded within the trough, and are near 27.5°N 148.5°W and 24°N 155°W. Another upper trough far northwest of Kauai, whose axis is oriented north to south and is along a line from 32°N 169°W to 25°N 170°W, has been heading toward the east-southeast near 10 mph over the past several hours. A swath of broken high clouds exists on the east side of the trough axis.
Convection is firing along the intertropical convergence zone far south of Hawaii. Most of the showers and thunderstorms have been occurring from 08°N to 12.5°N east of 165°W, and the more intense activity from 05°N to 10°N west of 165°W. A weak vortex, or circulation, has been pushing slowly toward the west over the past six hours. It is now about 550 miles south-southeast of Hilo.
KINEL
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