Hawaiian Islands Satellite Interpretation Message
Sun, 12 Sep 2010 00:40:00 -0500
Based on data through 0500 UTC September 11 2010.
A southwesterly wind flow at 30000 feet is carrying a ribbon of cirrus clouds over the main Hawaiian islands. These clouds originate from thunderstorms in the wake island, marshall islands area located around 2000 miles west southwest of Kauai. The ribbon of cirrus is about 450 miles wide with the thickest part covering most of Kauai county. This ribbon of cirrus also mark the position of the sub tropical jet stream which contain winds of 55 to 75 mph. The cirrus extends to 800 miles to the northeast of Kauai, to 30°N 147°W before turning east and dissipating.
The cirrus is thin enough to view the low level clouds situation east of Kauai. At 7 pm HST, satellite imagery shows relatively sparse coverage. There are locally broken low clouds present across the slopes and coast of the Big Island from upolu to the Puna district, the upper Kau slopes, and the Kona slopes and coast with a sliver extending into the adjacent waters between Captain Cook and at Milolii. Locally broken low clouds are also present over the windward and mountain areas of Oahu, Molokai and Maui.
Other than for the cirrus, the rest of the island skies are fair. With this in mind, the showers are absent on weather radar.
Satellite imagery shows some broken low clouds closing in on the Hamakua coast of the Big Island and a lesser amounts threatening the windward sections of the smaller islands. These clouds contain a few light showers. The low level wind flow is from the northeast over the waters north through east of the Big Island, becoming east northeast over the windward waters of the smaller islands. The wind speeds are between 15 and 20 mph.
Water vapor imagery shows an upper level low near 28°N 168°W or 650 miles northwest of Kauai. A trough extends northeastward from the low through 34°N 155°W to another upper low at 37°N 141°W. Another trough extends southwestward from the first low through 25°N 173°W to 24°N 178°E. Isolated towering cumulus clouds marks the location of the first low.
In the tropics south of the Hawaiian islands, the intertropical convergence is marked by widely scattered convection within 100 miles either side of a line from 12°N 140°W to 09°N 165°W. Also, an area of deep convection is noted within 100 miles radius of a point at 08°N 174°W. It has a cloud top of 50000 feet.
LAU
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