Issued: Dec 12, 2013 8:00 AM HST
Water vapor imagery shows an upper level trough located near 174°W, about 200 miles east of Midway atoll or about 900 miles west northwest of Kauai. This trough is moving to the east at 20 mph. Broken middle and high level layered clouds are located within 500 miles east of this trough. A band of persistent cumulonimbus clouds is located within 100 miles east of a line from 30°N 162°W to 22°N 167°W. Cloud tops extend up to 50000 ft. The overall line is moving to the east slowly, while individual cells are moving to the northeast at 30 mph.
Farther to the south, an area of cirrus clouds associated with an upper level jet is located generally south of a line from 10°N 180° to 17°N 160°W to 12°N 153°W. The overall area of high clouds is moving to the northeast at 40 mph, while individual cloud elements are moving to the east northeast at 70 mph.
Based on low cloud motions, high pressure is located just north of the area near 32°N 146°W, with a ridge extending southwest through 23°N 164°W. North of the ridge, cloud motions are to the northwest and north at 15 to 20 mph. Elsewhere north of 25°N, cloud motions are generally to the west at less than 10 mph. South of 25°N, cloud motions are to the west or west northwest at 15 to 25 mph. North of 19°N and east of 152°W, clouds are composed primarily of stable stratocumulus and closed cell cumulus elements. To the south and west of this area, clouds transition to more showery open cell cumulus elements.
Across the main Hawaiian islands, broken low clouds cover the eastern half of Kauai and the northern half of Oahu. Broken to overcast low clouds also cover northeast Molokai east of a line from kalaupapa to pukoo. Broken low clouds cover the north coast of Lanai. Broken to overcast low clouds cover the eastern slopes of Haleakala from nahiku to Hana to kaupo below 5000 ft. On the Big Island, broken low clouds cover portions of eastern Puna district. These clouds are part of a larger band that extends 100 miles offshore to the northeast and east of the Big Island. Broken low clouds also cover portions of north Kona district below 4000 ft, as well as south Kona district north of Honaunau. These clouds extend 15 miles offshore to the west.