Based on data through 1800 UTC May 30 2016.

Water vapor imagery shows an upper level trough moving to the east near 30 mph, with its axis running from 45°N 143°W to 30°N 146°W to 23°N 150°W. Visible imagery shows a surface frontal boundary from 40°N 140°W to 27°N 145°W to 23°N 153°W and through Oahu. The upper trough detailed above and ample moisture along the east side is supporting a 200 mile wide band of thick layered clouds along the frontal boundary north of 27°N, with cloud tops between 35 and 40 thousand feet. Thick layered clouds transition to a 125 mile wide band of overcast towering cumulus /tcu/ between 27°N 146°W to 23°N 153°W. Tcu tops reach upwards of 15 to 20 thousand feet. The front weakens further as it crosses Oahu, becoming a thin scattered to broken line of showery cumulus /cu/ with tops between 9 and 12 thousand feet.

Scattered stratocumulus /sc/ and cu fill in most of the remaining areas. Low level satellite derived winds show a surface ridge from 40°N 130°W to 22°N 140°W to 20°N 153°W. The low level clouds between Hawaii and 140°W and north of 20°N are moving to the northwest and north between 10 and 15 mph. Elsewhere, the low level clouds are generally moving to the west and southwest between 10 and 20 mph.

Cirrus /ci/ blow off from scattered thunderstorm convection south of 10°N is being drawn north and east along an upper level jet. Most CI is staying south of 20°N and moving to the northeast between 45 and 55 mph.

The front mentioned above is providing clouds and showers to the northeast and northwest areas of Oahu. The southern portion of Oahu remains clear as of 8 am HST. The front over Oahu is moving slowly to the south southeast. Few low level clouds linger over the north and east sections of Kauai Molokai Lanai and Maui. The remaining areas on these islands and all of the Big Island are quiet with very little cloud cover.

Hawaii Visible Satellite image for 1800 UTC


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