SATELLITE DISCUSSIONBased on data through 0500 UTC October 27 2016.
Early evening infrared satellite images show a band of showery low clouds moving southwest at 10 to 15 mph over the main Hawaiian islands. This cloud band is about 100 miles wide, and is associated with a weakening frontal boundary. Estimated cloud tops range from 7 to 9 thousand feet. This cloud band is providing broken to overcast conditions over both windward and leeward sections of all islands. Clear to partly cloudy skies are confined to the upper elevations of the Big Island summits, and parts of the Kau coast and South Point areas.
A well-defined upper level low is evident in water vapor imagery, centered near 22°N 180. A large area of mid and upper level cloudiness is rotating around the eastern side of this upper low. Broken to overcast upper level cloudiness covers much of the waters south of 25°N and west of 170°W, while scattered to broken cirrus extends north and east as far as 29°N 162°W. Broken to overcast upper level cloudiness also covers the waters south of 18°N between 160°W and 175°W, with isolated embedded thunderstorms within this area extending up to 50 thousand feet. East of 160°W over to 140°W, only isolated thunderstorms are present between 08°N and 12°N.
A deep upper level trough axis is located east of the discussion area between 130°W and 140°W, and extends south to 15°N. Dry northerly flow prevails aloft to the east of 150°W along the west side of this trough.
Elsewhere across the central north Pacific, a 100 mile wide low cloud band along the previously mentioned weak frontal boundary extends east from the main Hawaiian islands through 19°N 150°W to 21°N 140°W. This cloud band is moving south at 10 to 15 mph, with estimated cloud tops from 6 to 9 thousand feet. To the north and east of the front, scattered to broken stratocumulus /sc/ mixed with some cumulus /cu/ prevail east of 155°W, with an area of broken sc and cu moving west at 15 to 20 mph within trade wind flow between 25°N and 30°N from 155°W to 165°W. Areas of scattered to broken sc and cu extend further west between 165°W and 180, and are also moving to the west with the trades.