Hawaiian Islands Satellite Interpretation Message
Fri, 01 Oct 2010 00:00:00 -0500
Based on data through 0430 UTC October 01 2010.
Varying amounts of low clouds, some with embedded showers, exist across the island chain, including the channels, this early evening. The most concentrated ceilings are over the Big Island, with almost the entire isle below 10 thousand feet blanketed in low clouds. Both Maui and Lanai are also seeing significant cloudiness. Molokai, Oahu, and Kauai have the fewest low ceilings, though showers are widespread across the Koolau range on Oahu as of bulletin time. Low cloud motion is from the east to east-northeast at 10 to 15 mph from the Big Island to Oahu, and from the northeast at 15 to 20 mph in the vicinity of Kauai.
Surface troughing in the area is causing the showery conditions over the isles and in the adjacent coastal waters. Most of the cloudiness and rain are currently just north of the state from Oahu to the Big Island. Isolated showers and low ceilings are evident west of the Big Island and south of the other isles, and west and north of Kauai. Skies are nearly clear east clockwise through south of the Big Island.
In the upper air above 25 thousand feet, the axis of a north- northeast to south-southwest oriented trough is east of the Big Island and is along a line from 25°N 149°W to 18°N 153°W to 12°N 155°W. The system has been nearly stationary over the past six hours. A nearly stationary upper high is centered near 23°N 167°W, or about 465 miles west of Kauai. The counterclockwise rotation associated with the trough, in combination with the clockwise rotation around the high, is producing north winds over the islands, with the highest speeds, in excess of 60 mph, over the island of Hawaii.
Unorganized showers and thunderstorms are firing along the intertropical convergence zone south of the aloha state. Most of the activity is occurring from 10°N to 14°N between 147°W and 154°W, and from 05.5°N to 12°N between 161°W and 179°W.
KINEL
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