Hawaiian Islands Satellite Interpretation Message
Tue, 16 Nov 2010 18:30:00 -0600
Based on data through 0000 UTC November 17 2010.
Water vapor imagery shows an upper level low north of the area near 34°N 173°W, or about 500 miles northeast of Midway atoll. This low is moving to the east northeast at 10 to 15 mph. A strong shortwave trough extends from this low to 32°N 162°W, and is associated with a cold front that is located over the northwest part of the area.
The cloud band associated with this front is between 200 miles and 300 miles wide, and the leading edge extends from 30°N 159°W to 25°N 162°W to 19°N 180°. The band is composed of deep layered clouds east of 164°W. Isolated cumulonimbus clouds are embedded within the layered clouds, with convective cloud tops extending up to 45000 ft. The band is thinner and less continuous west of 165°W, and is composed primarily of cumulus and towering cumulus elements. Isolated cumulonimbus clouds are also embedded within this portion of the frontal band, generally between 164°W and 169°W, with cloud tops extending up to 40000 ft. Additional cumulonimbus clouds are located ahead of the main frontal band, generally between 161°W and 164°W north of 21°N. These cloud tops also extend up to 45000 ft. The overall frontal band is moving to the east at 15 to 20 mph, although individual cloud elements are moving to the northeast at 40 mph.
Behind the cold front, bands of broken to overcast cumulus clouds are moving to the east and east northeast at 40 mph. An area of active cumulonimbus clouds has moved north of the area, and is located closer to the core of the upper low. These clouds are located between 167°W and 173°W north of 31°N, and are moving to the northeast at 40 mph. Cloud tops extend up to 32000 ft.
South of the main Hawaiian islands, a band of cumulus and towering cumulus clouds extends south and east from the convection west of Kauai. This band runs from 21°N 164°W to 14°N 161°W to 10°N 156°W. The band is composed of scattered to broken cumulus and towering cumulus elements, but with isolated cumulonimbus clouds embedded within the line. Cloud tops have warmed over the past few hours, but earlier this morning tops had extended up to 42000 ft.
Water vapor imagery also shows a second upper low near 24°N 144°W, or about 800 miles east northeast of Hilo. This low is moving to the northeast at 5 mph. There is an area of cirrus and cirrocumulus clouds northeast of the low, generally between 25°N and 29°N east of 146°W. These clouds are moving to the north and northwest at 20 to 30 mph.
An additional area of cirrus and cirrostratus is located south of the low, generally south of 21°N and east of 147°W. These clouds are moving to the northeast at up to 50 mph. Isolated cumulonimbus clouds are located within this area, generally south of a line from 10°N 151°W to 14°N 140°W. Cloud tops extend up to 50000 ft.
Across the main Hawaiian islands, thin patches of cirrus clouds are located over Kauai and Oahu, and are debris from the cumulonimbus clouds located west of the state. At low levels, a large area of broken to overcast showery cumulus clouds covers Niihau, and extends offshore to the south and west. Broken to overcast low clouds cover the interior of Kauai. Broken low clouds cover the slopes of the Waianae and Koolau ranges on Oahu. Broken low clouds cover the interior of Molokai and Lanai. Broken to overcast low clouds also cover the west Maui mountains, and lower slopes of Haleakala below 7000 ft.
On the Big Island, broken low clouds cover windward sections from north Kohala to Kau districts below 9000 ft, and extend 20 miles offshore to the northeast. Broken to overcast low clouds cover Kau district below 10000 ft, and north and south Kona districts below 5000 ft. These clouds extend 15 miles offshore to the west. Scattered to broken clouds cover the rest of north Kona district up to 9000 ft, and also leeward sections of north and south Kohala districts.
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