Issued: Mar 10, 2014 7:30 PM HST
Based on data through 7:00 pm Mar 10 2014 HST
Water vapor loop shows a broad upper trough across the central north Pacific with an axis extending through 50°N 160°W and 31°N 155°W. The eastern flank of this upper trough is marked by a ragged 400 mile wide band of overcast layered clouds west of a line from 50°N 136°W to 40°N 145°W to 30°N 151°W to 25°N 157°W. Additional overcast layered clouds lie along the western flank of the upper trough north of 33°N and west of a line from 49°N 180°W to 45°N 170°W to 37°N 164°W. The upper trough appears to be moving toward the east at 20 mph north of 38°N but is almost stationary farther to the south. Breakaway elements of high clouds from the cloud band across the eastern flank pass across the main Hawaiian islands from time to time. Isolated cumulonimbus, CB, have formed near the base of the upper trough from 22°N to 25°N between 146°W and 151°W.
There appear to be two low level anticyclonic circulation centers at low level, one on either side of the upper trough. The eastern center, actually a subtropical high, is near 40°N 130°W while the other one is near 33°N 168°W. A weak ridge connects the two, placing the main Hawaiian islands within sluggish northeast flow south of the ridge axis.
Low cloud cover is rather sparse across the smaller islands this evening. Kauai, Oahu, Molokai and Lanai appear to have scattered low clouds to clear skies. Broken low clouds cling to windward Haleakala slopes on Maui as well as across windward and southeast-facing shores and slopes of the Big Island. The patches of high clouds moving across the islands are thin enough to see low clouds through them even in infrared imagery. Satellite loop shows low clouds are moving across local waters toward the southwest at about 10 mph.