Issued: Sep 19, 2014 2:15 AM HST
Low cloud coverage of the main Hawaiian islands including the surrounding waters, is pretty much scattered to locally broken this early Friday morning. The prevailing easterly wind flow of 10 mph, is carrying some of these clouds and showers onto the windward and mountain areas of the smaller islands. The tops of the showers are between 10 and 13 thousand feet. Fair skies otherwise ruled the rest of these islands.
The waters off the Puna and Kau coasts of the Big Island have had an increase in showers in the past couple of hours which poses an immediate threat of moving onshore. Further more, layered clouds associated with a cluster of thunderstorms have advance to westward to 45 miles off the Kau coast. Elsewhere of the Big Island, the afternoon clouds from yesterday, have pretty much left the island with fair skies in control.
The layered clouds from the cluster of moderate to strong thunderstorms between 190 and 420 miles south of the Big Island, appears separate from a disturbance or vortex located at 13°N 154°W or about 430 miles south of South Point which continues to move west slowly. This cluster of deep convection has cloud tops of 50000 feet. Another disturbance located at 14°N 146°W or 735 miles east southeast of the Big Island, is moving west at 10 mph. The disturbance is marked by an isolated moderate thunderstorm. A third disturbance is detected near 07°N 166°W or 1050 miles southwest of the Big Island. A monsoonal trough links all three disturbances.
Less intense convection are scattered in an area between 15°N and 10°N from 147°W to 153°W. Another pool of scattered storms lies further east, in the area from 11°N to 06°N between 137°W and 147°W.
The remnants of the frontal boundary east northeast of the Big Island is less evident from 7 hours ago.
Water vapor imagery shows the short wave trough in the westerly flow aloft over Maui this hour. The trough continues to move east at 15 mph.