Hawaiian Islands Satellite Interpretation Message
Tue, 18 Jan 2011 12:30:00 -0600
Based on data through 1800 UTC January 18 2011.
An upper low about 370 miles northeast of the main Hawaiian islands is easily seen in water vapor imagery. This feature is marked by a ragged 300 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 22°N and 26°N from 148°W to 152°W. The low has not moved much over the past 12 hours.
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 38°N 157°W to 30°N 159°W to 25°N 170°W to 21°N 180°W, this cloud band is moving toward the southeast at 15 to 20 mph. The leading edge of this band is about 460 miles northwest of Kauai. Isolated CB are noted along the leading edge of the cloud band between 170°W an 180°W.
Middle clouds along the southern and western flanks of the upper low lie across the main Hawaiian islands and adjacent waters, blocking the view of low clouds there. 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 deeper convection.
POWELL
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