Hawaiian Islands Satellite Interpretation Message
Wed, 22 Dec 2010 18:30:00 -0600
Based on data through 0000 UTC December 23 2010.
Water vapor imagery shows a broad upper trough over the central Pacific, with a number of embedded shortwave troughs moving across the region. One upper level trough is located near 24°N 158°W, or about 200 miles north of Oahu. This shortwave is moving to the east southeast at 20 mph. A cloud band associated with a dissipating front is located near the shortwave, or just northeast of the main Hawaiian islands. The band is up to 300 miles wide, and the western edge extends from 30°N 163°W to 17°N 151°W to 17°N 140°W. The band is composed primarily of broken cumulus and stratocumulus elements, but with areas of mixed layered clouds along the western edge. One area of deeper clouds is located ahead of the shortwave, beginning about 80 miles north northeast of Oahu. Broken layered clouds with embedded cumulonimbus elements are located along the western edge of the cloud band generally between 147°W and 158°W. Cloud tops extend up to 40000 ft.
Farther upstream to the northeast, patches of broken to overcast low clouds are located behind the frontal cloud band. These clouds are composed primarily of showery open cell cumulus elements south of 24°N, and more stable closed cell cumulus elements north of 24°N. Cloud motions are to the northwest at 10 to 15 mph south of 26°N, and to the northeast at 10 to 15 mph north of 26°N.
Another upper level trough is located near 15°N 152°W, or about 400 miles southeast of the Big Island. This trough is moving to the east southeast at 20 mph. Isolated cumulonimbus clouds are located east of this trough, and are located generally from 14°N to 16°N between 148°W and 151°W. Convective cloud tops extend up to 44000 ft. The cumulonimbus clouds are nearly stationary, although nearby cirrus clouds are moving to the east at 35 mph.
A third upper level trough is located near 21°N 171°W, or about 650 miles southeast of Midway atoll. This trough is moving to the east northeast at 30 mph. Isolated cumulonimbus clouds are located east of this trough, generally from 19°N to 23°N between 163°W and 170°W. Cloud tops have warmed, and now extend up to 36000 ft. Individual cumulonimbus clouds are nearly stationary. Patches of broken cirrus and cirrostratus clouds are located through this area as well. These high clouds are moving to the east at 30 mph.
Farther west, a larger area of broken to overcast layered clouds is located north of 14°N along the international dateline. The thick layered clouds extend as far east at 176°W. Scattered cumulonimbus clouds are embedded within this line. Cloud tops extend up to 48000 ft. Broken cirrus and cirrocumulus elements extend farther east from the main area of layered clouds, generally as far east as 173°W.
Across the main Hawaiian islands, broken low clouds cover the interior of Kauai. Broken low clouds also cover the interior of Niihau, and extend 20 miles offshore to the west northwest. Broken low clouds cover the slopes of the Koolau and Waianae ranges on Oahu, as well as portions of the interior of the island. Broken to overcast low clouds cover much of Maui county and the adjacent coastal waters, with only a few clear sections across southern Molokai west of Kaunakakai. Broken to overcast low clouds also cover most of the Big Island, including the summits of Mauna Loa and Mauna Kea.
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