Hawaiian Islands Satellite Interpretation Message
Sat, 01 Jan 2011 12:30:00 -0600
Based on data through 1800 UTC January 01 2011.
A north northeast to south southwest oriented upper level trough is noted on water vapor imagery, about 385 miles northwest of Kauai at 7 am HST. It continues to push east southeast at 15 mph. The trough axis lies along a line from 37°N 155°W to 30°N 163°W to 19°N 168°W, and extends further north into the Aleutian islands.
A 95 mph northerly jet Max is located just to the west of trough axis, while lighter south to southwest winds of 30 mph lies to the east of the trough that include the Hawaiian islands.
The cloud cover over the main Hawaiian islands consisted of a 100 mile wide band of overcast mid and high clouds, covering Kauai county and the western half of the Kauai channel. This band formed as it was approaching Kauai during the past 6 hours, and is now advancing towards Oahu. The central islands, consisting of Oahu and Maui counties, has a patch of broken to overcast low clouds. The low clouds included isolated towering cumulus and even a cumulonimbus cloud /cb/, located off the northernmost tip of Oahu in the past hour.
With all these clouds, the weather radar is painting widely scattered showers, affecting the windward sections of Oahu and Molokai. The weather radar loop indicates a cyclonic vortex located over the north end of the Molokai channel, which has become less distinctive in the past hour.
In the area within 800 miles east of the upper trough, south of 30°N, the cloud cover is generally made up of broken cumulus type clouds.
The low level wind pattern is confusing. Satellite loop shows an easterly wind flow over the Big Island and Maui, and southeast winds over the open waters to the northeast and north of Maui. Wind sensors and radar loop are indicating a light northerly wind component over Kauai and Oahu.
Elsewhere, further away from the main Hawaiian islands, a cluster of thunderstorms is located between 300 and 500 miles southwest of Kauai, and is associated with a low level trough. Eight hundred miles northwest of Kauai is an area of broken to overcast mid and high level clouds. These clouds are dissipating as they approach the upper level trough.
Loose CB activity is noted between 350 and 800 miles south of the Big Island, or, from 14°N to 07°N.
LAU
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