Hawaiian Islands Satellite Interpretation Message
Sun, 12 Sep 2010 13:30:00 -0500
Based on data through 1800 UTC September 12 2010.
A somewhat dry trade wind flow is in place over the main Hawaiian islands, while an upper level low to the northwest is sending a ribbon of high clouds over portions of the islands.
A moderate trade wind flow is producing low clouds across mainly windward portion of the main Hawaiian islands, with the greatest amount of low cloud cover found across windward Big Island and its adjacent waters. A batch of broken stratocumulus with some embedded, shower-bearing cumulus clouds moved over windward slopes of the Big Island in the predawn hours and remains in place. Cloud tops rise to around 10 kft, and some of the moisture associated with this feature is producing morning clouds over Kau and the leeward slopes south of Kailua-Kona.
Cloud cover decreases dramatically over waters around the smaller islands, reflecting the rather dry conditions in the trade wind flow. Precipitable water values in the flow are running about 80 percent of normal, and patches of broken low clouds are confined to windward slopes. Individual low clouds near the islands are travelling from the east around 15 mph.
An upper level high centered nearly 900 miles east of the state is producing stable conditions in the trade wind flow over the islands, while a deepening upper level low 600 miles northwest of Kauai is sending a ribbon of broken high clouds over the garden isle. The upper low is centered near 28°N 167°W and is drifting eastward.
The upper low is producing a pair of nearly stationary surface troughs. The weaker surface trough runs along 30°N 161°W to 27°N 167°W and is marked by isolated towering cumulus cells and thunderstorms with tops to 38 kft. Another, deeper surface trough is found at the base of the upper low along 24°N 167°W and 21°N 169°W. Broken layered clouds with embedded thunderstorms rising to 42 kft are observed within 200 miles east of the trough. A 300 mile-wide ribbon of broken high clouds is streaming from this area and is being carried over Kauai for 1200 miles to the northeast along a subtropical jet on the flank of the upper low.
To the south of the state, isolated thunderstorms within the ITCZ remain active between 12°N and 09°N.
DWROE
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