Hawaiian Islands Satellite Interpretation Message
Mon, 20 Sep 2010 00:30:00 -0500
Based on data through 0500 UTC September 20 2010.
There has been little change in cloud cover around the main Hawaiian islands since this afternoon as clouds from the trailing end of a cold front continue moving over the islands in the trade-wind flow.
Clouds are scattered over Niihau. Showery, broken to overcast low clouds cover windward areas from Kauai to Maui, and broken low clouds are spreading leeward on Oahu, Molokai and Lanai. Broken to overcast clouds cover most lowland areas of the Big Island of Hawaii but clouds are isolated along the coast near Cape Kumukahi and between Volcano and Pahala. Skies are clear over the interior of the Big Island above about 5500 feet of elevation.
Low clouds near the main Hawaiian islands are moving from the northeast at 20 to 25 mph. There are scattered to broken low clouds upstream of the islands from Kauai to Molokai and broken to overcast low clouds upstream of Maui and the Big Island. The clouds over Maui and the Big Island are part of the trailing end of a frontal band. The 150 mile wide band of showery, broken to overcast low clouds lies southeast of a line from 26°N 140°W, to 21.5°N 150°W, to 22.5°N 154°W, across Maui to 135 miles south of Kauai to 21°N 165°W. The band has been nearly stationary over the past several hours but a bulge along the northwest edge of the band is moving southwest at 15 mph. This area of showery cumulus clouds is moving over the Big Island and Maui and could spread over Molokai.
A 200 mile wide band of showery, broken to overcast low clouds is centered from 19°N 171°W to 25°N 173°W. This cloud area continues moving toward the west at 20 mph.
An unusual double cloud band persists in the deep tropics south of the Hawaiian islands. A 300 to 400 mile wide band of broken layered clouds, scattered tcu, and isolated cb lies south of a line from 10°N 140°W to 12°N 150°W to 09°N 160°W to 09°N 176°W. There may be a small low around 150°W where the band bulges northward, but if so, the low is not very easy to find on infrared imagery. A weaker 200 mile wide band of showery broken low clouds and scattered tcu is centered from 14°N 140°W to 12°N 172°W.
Water vapor imagery, which shows features mainly above 24000 ft, shows a trough aloft centered from a cyclone at 30°N 150°W through another low at 26°N 156°W to 24°N 160°W. An anticyclone aloft is centered 680 miles west northwest of Kauai near 26°N 170°W.
DONALDSON
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