Hawaiian Islands Satellite Interpretation Message
Mon, 27 Sep 2010 00:30:00 -0500
Based on data through 0500 UTC September 27 2010.
Two parallel cloud bands associated with a front extended across the ocean north of the main Hawaiian islands. The primary frontal cloud band was located within 60 miles of the curve from 30°N 178°W to 28°N 169°W to 30°N 159°W and further northeast. A pre-frontal cloud band was located within 60 miles of the curve from 25°N 165°W to 27°N 155°W to 30°N 150°W and further northeast, though cumulus and stratocumulus cloud fragments further to the west and northwest showed signs of merging into an extension of this band. Both features consisted of nearly solid middle to low cloud layers, and shifted toward the southeast slowly.
To the south, light thunderstorm activity continued in the ITCZ between 13°N and 03°N, mostly west of 154°W. Although several weak centers of low pressure were present in the ITCZ, they did not appear to be associated with persistent thunderstorm activity. Layered middle to high debris clouds from this and earlier convection obscured lower features mostly from 14°N to 03°N, and partly as far as 17°N.
Water vapor images showed a center of low pressure in the upper atmosphere just to the southwest of the main Hawaiian islands. This low slightly enhanced showers from island lee plumes passing under it, but had little effect otherwise.
Elsewhere, cloud cover across Hawaiian waters consisted mainly of loose bands or clumps of marine stratocumuli and cumuli located between the curve from 19°N 180 to 22°N 156°W to 29°N 140°W, and the curve from 11°N 180 to 17°N 164°W to 15°N 152°W to 18°N 140°W. The clumps varied in size from individual small cumuli to one large clump about 450 miles long and 350 miles wide. These clouds generally rose to heights of 8000 to 10000 feet, and moved toward the southwest to west at around 10 miles an hour.
Across the main Hawaiian islands, cloud cover consisted mostly of afternoon cumulus buildups and their layered debris clouds over higher terrain inland, though a few marine cumuli and stratocumuli also moved ashore along slopes facing east. Areas with the greatest cloud cover included northwest Kauai, both mountain ranges on Oahu, central Molokai, central Lanai, the west Maui mountains, northwest through northeast slopes of Haleakala on Maui, and most of the Big Island except for the summits of Mauna Kea and Mauna Loa. These clouds varied in height from around 3000 feet to near 9000 feet. Radar data from near the islands showed scattered showers offshore in the lee plume southwest of Maui county, but isolated showers at most elsewhere.
RYSHKO
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