Issued: Jan 30, 2015 2:00 AM HST
Based on data through 2:00 am Jan 30 2015 HST
Scattered to broken low clouds ahead of an advancing front are causing occasional ceilings over Kauai, Oahu, Molokai and Lanai this early morning. Skies remain no worse than partly cloudy over Maui and the Big Island as of bulletin time. Low cloud motion is from the west at 15 to 20 mph from Kauai to Molokai at the moment. Radar wind profiles, however, indicate that low level flow near Maui and the Big Island is from the southwest at 15 to 20 mph.
In the adjacent coastal waters, conditions are scattered to broken at the lower levels west of Maui as of this writing. Elsewhere are clear to scattered skies.
The leading edge of low clouds with the front now appear to be making landfall in west Kauai, though radar returns show only minimal precipitation with the boundary. The system has recently been heading east to southeast at 20 to 25 mph. This front has been merging with another front that has remained intact north of the islands. A thin line of showers is at the leading edge of the merging boundaries, which becomes quite active convectively north of 30°N between 147°W and 150°W. Behind the feature are scattered towering cumulus clouds, tcus, which are currently located north of 27°N between 158°W and 168°W.
The upper air above 25 thousand feet remains dry across much of the central north Pacific, according to the most recent water vapor images. This is particularly so from 10°N to 27°N east of 165°W.