Hawaiian Islands Satellite Interpretation Message
Thu, 23 Dec 2010 23:30:00 -0600
Based on data through 0500 UTC December 24 2010.
Water vapor images showed a trough of low pressure in the upper atmosphere passing over and just north of the main Hawaiian islands. Thin high clouds associated with this feature partly obscured lower features within 125 miles of the point 26°N 154°W.
A band of deep layered clouds with embedded isolated towering cumuli and possible thunderstorms extended across Hawaiian waters within 210 miles of the curve from 20°N 180 to 24°N 175°W to 30°N 173°W and further southwest and north. Layered high to middle clouds of varying thickness also partly to mostly obscured lower features west to 180, and east up to about 500 miles from the leading edge of the main cloud band. This feature as a whole moved east slowly.
Another band of low to middle cloud layers associated with a second front extended across Hawaiian waters north of the curve from 30°N 171°W to 26°N 153°W to 29°N 140°W. This feature moved south at 10 to 15 miles an hour.
A disorganized mass of mostly middle cloud layers extended southeast from the second frontal cloud band within 200 miles of the line from 27°N 152°W to 23°N 151°W. These clouds probably were associated with the upper-atmospheric trough described in the first paragraph above, but also may have been associated with the second front as well.
To the south, light thunderstorm activity continued in the ITCZ between 12°N and 06°N. Layered middle to high debris clouds from this and earlier convection partly to mostly obscured lower features from 13°N to 03°N.
Nearly stationary clusters of towering cumuli and thunderstorms developed within the area bounded by the curve from 21°N 157°W to 21°N 150°W to 18°N 149°W to 15°N 152°W to 20°N 157°W. Layered middle to high debris clouds from this convection mostly to partly obscured lower features within about the same area, though thin streaks of cirrus layers also extended east toward 140°W.
Otherwise, cloud cover across Hawaiian waters consisted mainly of unorganized clumps of marine cumulus and stratocumulus. These clumps varied in size from individual small cumuli to a maximum size of about 300 miles long and 150 miles wide. They occurred throughout the area, but were most common between 140°W and 150°W. These clouds formed and dissipated periodically, but remained nearly stationary.
Across the main Hawaiian islands, cloud cover consisted mostly of layered debris clouds from towering cumuli and thunderstorms over and around the Big Island and Maui. Otherwise, cloud cover consisted mainly of more typical low layered debris from afternoon cumulus buildups inland. Areas with the least cloud cover were limited mainly to Niihau, northeast Kauai, northwest Oahu, west Molokai, most of Lanai, and southwest Maui. Radar data from near the islands showed scattered showers offshore to the southwest of Kauai and along the southeast coast of the Big Island, a line of heavy showers extending offshore to the west from Keahole Point on the Big Island, and areas of heavy showers offshore well to the southeast of the Big Island. The lower clouds generally rose to heights of 2000 to 7000 feet, while the higher clouds approached heights of 40000 feet.
RYSHKO
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