Hawaiian Islands Satellite Interpretation Message
Sun, 30 Jan 2011 23:30:00 -0600
Based on data through 0500 UTC January 31 2011.
A band of layered clouds associated with a weakening front extended across Hawaiian waters within 60 miles of the curve from 18°N 162°W to 26°N 152°W to 30°N 150°W. This feature consisted of low to middle layers southwest of about 28°N 151°W, and deep layered clouds north of that point. Fragmented marine stratocumuli extending about 900 miles to the west from the tip of the main cloud band represented the dissipated remnants of its westward extension. A pre-frontal band of low to middle cloud layers was located within 60 miles of the curve from 19°N 155°W to 24°N 151°W to 30°N 149°W and further north. Both bands moved toward the southeast at around 15 miles an hour. Loosely packed cold-air cumuli prevailed northwest of the main cloud band.
To the east, isolated thunderstorms associated with low pressure in the middle atmosphere developed within 120 miles of the point 17°N 140°W. Layered middle to high debris clouds from this convection partly to mostly obscured lower features within about this same area.
To the south, there was little thunderstorm activity to indicate an ITCZ.
Otherwise, cloud cover across Hawaiian waters consisted mainly of loose clumps or bands of marine cumuli and stratocumuli up to about 500 miles across, though individual small cumuli also were present throughout. The largest clumps occurred in the corner north of 20°N and east of 150°E, and southwest of the line from 20°N 177°W to 05°N 160°W. These clouds generally rose to heights of 8000 to 12000 feet, and moved toward the west southwest at 10 to 15 miles an hour, though northeast of the main Hawaiian islands they turned around toward the northwest and then north before approaching the front.
Across the main Hawaiian islands, cloud cover consisted mostly of middle to low cloud layers associated with the frontal cloud band over Maui county, though low to middle cloud layers from the pre-frontal cloud band languished over much of the Big Island, and cold-air cumuli pressed ashore from the northwest over Kauai county. Areas with the least cloud cover were limited mainly to south Kauai, southwest Oahu, and the immediate northwest coast of the Big Island. These clouds varied in height from 6000 to 16000 feet. Radar data from near the islands showed scattered showers offshore to the west and northeast of Oahu, over and around the east half of Maui, and along and offshore from the southeast coast of the Big Island, but isolated showers at most elsewhere.
RYSHKO
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