Hawaiian Islands Satellite Interpretation Message
Wed, 08 Sep 2010 19:30:00 -0500
Based on data through 0000 UTC September 09 2010.
A fairly typical distribution of low clouds continues to be observed over the islands this afternoon, given that light to moderate trade winds prevail in a stable atmosphere. Having said that, cloud cover has generally increased over the islands since this morning.
Kauai has broken cumulus elements over interior portions of the island, and along the northwestern coastal areas, with wisps of cirrus clouds also moving over the island from the southwest. Coastal areas along the east, south and southwest shores are mostly sunny aside from the high level cirrus. Although skies over Niihau continue to be mostly sunny, an area of broken cu extends up to 50 miles to west and southwest of the island. Thin cirrus elements are also in the vicinity of Oahu, with broken cu over the ridge of the Koolau range and the lower windward slopes, with primarily scattered cu over the remainder of the island. A patch of broken cu is over the near shore waters north of Maui, and east of Molokai, and is contributing to the broken cu that already exists over eastern Molokai, the lower slopes of the west Maui mountains, and the lower windward slopes of Haleakala. Broken cu are also over the southwestern lower slopes of Haleakala, and extend to the southwest over the near shore waters and Kahoolawe. The remainder of Maui county, aside from patches of broken cu over interior and southern Lanai, is under mostly sunny skies this afternoon. On the Big Island, the Kona and Kau lower slopes are blanketed in broken to overcast stratocumulus /sc/ and cu, with scattered cu prevailing over the Hilo and Hamakua districts. The remainder of the island is under mostly sunny skies.
Few to scattered cu exist upstream to the east of Kauai and Oahu, with the aforementioned patch of broken cu over windward waters in Maui county. Broken to overcast cu and sc extend up to 80 miles northeast from the big island's Hamakua coast, but the remainder of the near shore waters are mostly sunny. Low cloud motion near the islands is toward the west-southwest at speeds between 17 and 20 mph.
Broken high clouds have increased over the past six hours over waters well southwest of the islands, and are associated with nearly stationary closed low aloft about 975 miles west-northwest of Kauai, near 26°N 175°W. Scattered thunderstorms are located near the core of the low, from 23°N to 28°N between 173°W and 178°W, and the cirrus clouds cover the area from 12°N to 23°N between 161°W and 174°W. A trough aloft extends southward from the low, and is located along a line from the low to 14°N 175°W. Scattered thunderstorms are located near the base of the trough, from 05°N to 13°N between 170°W and 180. The northeastern edge of the mass of high clouds is near Kauai and Oahu, with the cirrus developing within the southwest flow associated with the trough aloft.
A pair of weak disturbances located about 550 to 800 miles south and southeast of the Big Island are triggering isolated thunderstorms, but lack significant organization, although upper level winds appear to be marginally conducive for further development.
BIRCHARD
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