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Satellite Interpretation Message

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Issued: Dec 21, 2014 2:30 PM HST

Based on data through 2:00 pm Dec 21 2014 HST

The leading edge of frontal cloud band was just inside of 100 miles west-northwest of Kauai early this afternoon. This leading edge stretched through 30°N 155°W to 24°N 160°W to 19°N 180°E. The cloud band was about 125 miles wide south of 25°N but steadily widened to just over 250 miles across at 30°N latitude and to nearly 600 miles across at 40°N. The cloud band was approaching Kauai at 15 to 20 miles an hour.

The band consisted of broken to overcast low clouds south of 25°N latitude and mostly overcast low to mid level clouds between 25°N and 30°N. Behind the frontal band to the northwest, numerous patches and small clusters of stable low clouds were common.

Low clouds surrounding much of the state this morning had dissipated by afternoon. Currently very few clouds were seen in the immediate vicinity of the islands, except for a large cluster of broken to overcast cumulus clouds sitting about 25 miles east of the Big Island or 80 miles east of Maui. This cluster was nearly stationary.

At 2 pm, skies were sunny to mostly sunny over Oahu, Molokai and Kauai. However, there was a small cluster of clouds over the southeast part of Kauai. Maui and Lanai had some cloudy areas along the slopes but the majority of those two islands were seeing sunny skies aloft. The Big Island had the most clouds with partly cloudy to mostly cloudy conditions along most of its slopes.

The trade winds had vacated the 50th state since Friday ahead of the approaching front. Numerous clusters of broken to overcast low clouds, a mix of stratocumulus and cumulus clouds, were common northeast of the state between 20°N and 30°N east of 154°W. Those clouds between 145°W and 154°W were streaming northward. And those clouds between 140°W and 145°W were moving northwestward ahead of the front. The few low clouds seen near the islands were somewhat stationary.