Hawaiian Islands Satellite Interpretation Message
Tue, 09 Nov 2010 18:45:00 -0600
Based on data through 0030 UTC November 10 2010.
The low-level flow near the islands has changed little since this morning, veering from an east-southeast direction over waters near and east of the Big Island, to a south-southeast flow near Kauai. Additionally, low clouds over waters east of the islands are moving more quickly than those west of the islands, due to high pressure centered far northeast of the islands, and weak troughing located west of the islands. Low clouds are primarily few to scattered in coverage over near shore waters around the islands, with areas of broken low clouds over select island areas.
With the low level flow near the islands favoring a southeast direction, the smaller islands are in the wind shadow of the Big Island, which has allowed sea breezes to drive the development of broken low clouds along leeward slopes of Kauai and Oahu. The northwestern portion of the island of Kauai, northwest of a line from Princeville to Waimea, and the near shore waters, are covered in broken cumulus /cu/ and stratocumulus /sc/, as are the near shore waters immediately northwest of Niihau. Skies are nearly clear over the remainder of the island. Oahu has broken cu over both the Koolau and Waianae mountain ranges, while the central portion of the island has few to scattered cu. Scattered to broken cu are over windward Molokai slopes, while a narrow ribbon of broken cu is over the western end of the island. Windward slopes of Haleakala are mostly sunny with few cu, but broken cu and sc are over the windward portions of the west Maui mountains, and over the lower leeward slopes of Haleakala. Skies are sunny over Kahoolawe, with broken cu over interior Lanai. Most of the lower slopes of the Big Island are covered in broken to overcast sc and cu, but near shore coastal areas on the east side are mostly sunny, as are the interior and summit areas.
A curved band of broken showery cu lies over waters east of the islands, with the western edge of this 150 mile wide band about 100 miles northeast of the windward shores of Kauai and Oahu. The band lies along a line from 21°N 151°W to 23°N 156°W to 26°N 158°W to 30°N 158°W, and continues to move on a trajectory that would keep this moisture away from the islands. Low clouds over windward waters east of Oahu and Molokai are moving toward the northwest at speeds near 32 mph, with low clouds south of the Big Island moving toward the west at speeds near 22 mph. Low clouds over waters south of Kauai are moving toward the northwest at speeds between 10 and 15 mph.
North of 25°N, the northern portion of the band mentioned above is moving toward the north, ahead of a cold front that is well northwest of the islands, marked by a band of broken to overcast layered clouds, with embedded heavy showers, that is 300 to 500 miles wide. The cloud band is centered along a line from 30°N 163°W to 27°N 167°W to near 26°N 177°W.
BIRCHARD
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