Hawaiian Islands Satellite Interpretation Message
Wed, 08 Dec 2010 12:30:00 -0600
Based on data through 1800 UTC December 08 2010.
A surface front 375 miles north of Kauai has displaced the subtropical ridge over the main Hawaiian islands, where light winds and mostly clear skies dominate.
The nearly stationary surface front is marked by a 250 mile wide band of broken layered clouds centered along 30°N 150°W, 25°N 165°W, and 17°N 177°W. Isolated embedded thunderstorms rise as high as 50000 ft along the front, with the greatest amount of thunderstorms found west of 165°W. While a broad and deep upper level trough occupies much of the northeast Pacific, a smaller upper level trough moving to the east northeast around 20 mph along 30°N 174°W and 10°N 180° is providing the trigger for the enhanced thunderstorm activity along the front west of 165°W. The upper trough is also producing isolated thunderstorms just east of Midway atoll.
The front has displaced the nearly west to east oriented low level ridge over Oahu. As a result, scattered low clouds are moving from the south southwest at less than 10 mph near Kauai, while few low clouds are travelling from the south southeast near Oahu and Maui county. The flow near Kauai was strong enough to overpower land breezes on the southwest side of the island, producing broken low clouds over the terrain. Elsewhere on Kauai and the rest of the smaller islands, mostly clear skies prevail. On the Big Island, land breezes have produced clear skies over all areas except for the southeast slopes of Puna, where southeasterly low level flow is pushing ashore a small area of broken low clouds.
Water vapor imagery shows an area of mid level subsidence over and east of the Big Island and Maui county being eroded by the combined effects of the broad upper level trough over the northeast Pacific and the upper level trough approaching from the west.
A weak surface trough is passing 375 miles south of Kauai roughly along 18°N 160°W and 13°N 160°W. Developing upper level troughing over the region is triggering an isolated thunderstorm along the trough near 16°N 160°W. A small area broken low level clouds extend north of the trough into Hawaiian offshore waters.
DWROE
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