Hawaiian Islands Satellite Interpretation Message
Wed, 15 Sep 2010 00:30:00 -0500
Based on data through 0500 UTC September 15 2010.
The island skies at sunset include a thin overcast layer of high level cirrus clouds. These clouds are from thunderstorms located 1350 miles southwest of Kauai. Southwest winds over these storms above 20000 feet, are carrying these clouds to the Hawaiian islands.
The southwest winds above us are due to a well anchored upper level low and troughs located to the west of the state. The upper low is near 21°N 176°W. A trough extends northward from the low to 27°N 170°W to 30°N 165°W to 35°N 153°W. Another trough extends southward from the low to 15°N 176°W to 10°N 180°W. South to southwest winds is situated between the low/troughs and the Big Island. The bulk of the cirrus is confined to within 100 miles either side of a line from 12°N 175°W to 22°N 163°W to 25°N 150°W.
The cirrus are thin enough so that we are able to view the main Hawaiian islands and surrounding area. Satellite imagery basically shows scattered to broken low clouds upwind of the islands for 650 miles. These clouds, which contain a few showers, are riding in with an east northeast wind flow clocked at 15 to 20 mph. Broken coverage mainly resided over the windward and mountain sections of Kauai, Oahu, and Maui. Broken low clouds, containing a few showers, are present over the windward coastal waters of Kauai, Maui, and the Hamakua coast and Puna district of the Big Island. While the leeward sections of the smaller islands are generally fair, the Kau slopes, the Kona districts of the Big Island including the adjacent waters, are cloudy this hour. Weather radar has not detected any showers with these clouds.
Low cloud coverage increases to broken to overcast beyond 650 miles east northeast of the Big Island, and stretches northeastward to the southern California coast. Skies are mostly clear north of the main Hawaiian islands in the area between 25°N and 35°N from 135°W to 162°W.
Thunderstorm activity is non existent in the tropics south of the Hawaiian islands, except for a lone cell at 07°N 167°W.
LAU
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