Hawaiian Islands Satellite Interpretation Message
Tue, 18 Jan 2011 18:30:00 -0600
Based on data through 0000 UTC January 19 2011.
An upper low about 260 miles northeast of the main Hawaiian islands is easily seen in water vapor and enhanced infrared imagery. This feature is marked by a ragged 300 to 600 mile wide arc of layered clouds south through northeast of center, while a thin broken to overcast band of middle clouds lies along the western and southern flanks of the low. Isolated cumulonimbus, CB, are embedded within the layered clouds east of the upper low, mainly between 18°N and 24°N from 149°W to 152°W. The low has moved southeast at about 10 mph since this morning.
Broken to overcast layered clouds within a ragged 200 to 300 mile wide band mark a cold front northwest of the main Hawaiian islands. Extending west of a line from 47°N 150°W to 35°N 157°W to 30°N 159°W to 23°N 170°W to 20°N 180°W, this cloud band is moving toward the southeast at 15 to 20 mph. The leading edge of this band is about 430 miles northwest of Kauai. Isolated CB are noted along the leading edge of the cloud band between 167°W an 175°W.
Middle clouds along the southern and western flanks of the upper low lie across the smaller main Hawaiian islands and adjacent waters, blocking the view of low clouds from Molokai westward. A broad anticyclonic circulation appears to dominate low level flow east of the frontal cloud band and upper low. Satellite loop shows low clouds moving northward to the north of 25°N, while continued east to west flow is noted south of the broken to overcast middle clouds west of 150°W between 12°N and 18°N. There may be a weak surface trough just east of the upper low, with an axis along 150°W marking the eastern edge of the deeper convection.
Broken to overcast low clouds cover the southeast half of the Big Island. Broken low clouds cover all Haleakala slopes as well as the west Maui mountains.
POWELL
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