Hawaiian Islands Satellite Interpretation Message
Sat, 15 Jan 2011 12:30:00 -0600
Based on data through 1800 UTC January 15 2011.
Weak ridging at the surface and aloft is hanging on over the main Hawaiian islands, while a cold front approaches from the west.
Overnight ascat data showed a surface ridge extending from 30°N 140°W to the southwest across Oahu to 15°N 180°. With the ridge over the state drifting slowly north, a low level trade wind flow was building over Oahu and Maui county and was well-established over the Big Island. Individual low clouds are travelling from the east at almost 15 mph near the Big Island and Maui, decreasing to less than 10 mph around Molokai and Oahu, then veering out of the south at 5 mph near Kauai as the flow rounds the ridge.
Cloud cover is scant on most islands this morning as overnight land breezes have overpowered the background flow. Small patches of broken low clouds are noted across windward portions of Maui and Molokai, while Oahu and windward Big Island are mostly free of low clouds. Cloud cover is greater than normal on leeward Big Island, where broken low clouds cover the lower slopes and coast from Kawaihae to Milolii. On Kauai, the southerly flow has produced broken low clouds along the southern coast and slopes from Lihue to Waimea. With the exception of an area of broken low clouds west of the Big Island, low clouds are mainly scattered in coverage over Hawaiian waters. Cloud cover increases markedly to the east and northeast of the Big Island, where a field of stable, broken stratocumulus dominates.
An extremely strong, low latitude, and zonal, or west to east flowing, west Pacific jet stream runs along 30°N to 165°W then turns to the northeast. The jet stream is driving a cold front that covers the islands from necker to laysan. The 300 mile-wide frontal band stretches from 30°N 160°W to 23°N 168°W to 19°N 180° and is moving to the east at 15 mph. This feature is marked by overcast layered clouds and isolated, embedded thunderstorms with tops to 32000 ft north of 23°N and is comprised by broken low clouds south of 23°N.
DWROE
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