Last Updated on Wednesday, 01 October 2014 11:50
Issued: Oct 01, 2014 7:30 PM HST
Latest infrared satellite data shows a large trough far N of the island chain gradually migrating E, and pushing a sfc cold front boundary into the area. The leading edge of the front is marked by a 250-mile wide band of stratocumulus and layered clouds with embedded thunderstorms, extending from 30.0°N 154.2°W to 25.1°N 163.2°W to 24.5°N 172.2°W. The front is moving SE at about 20 mph, closest to the islands at around 220 miles NW of Kauai. Highest cloud tops within this band are reaching 41 thousand feet.
On the Big Island, mainly scattered low clouds prevail with broken high cirrus clouds streaming from the SW and covering most of the island S of the Kohala district. On Maui county, scattered to locally broken low clouds with a few showers linger over leeward areas of Haleakala, the W Maui mountains and central portions of Molokai. On Oahu, scattered low clouds prevail with only broken patches and a few small showers over the Koolau mountains and the Waianae range. On Kauai county, broken low clouds with a few showers remain over central and leeward areas from Koloa to mana.
Elsewhere, scattered to broken cumulus and stratocumulus clouds cover the area from 140°W to 160°W. Broken to locally overcast layered and cirrus clouds prevail S of 20°N and E of a line from the Big Island to 13°N 170°W. This layered clouds are associated with a weak upper level jet just S of the islands oriented W to E between 160°W to 140°W.
Far S of the island chain, an active intertropical convergence zone, or ITCZ, is showing areas of deep convection with broken to overcast layered clouds between 05°N to 10°N. A cluster of active thunderstorms is centered around 09.6°N 149.4°W, or about 780 miles SE of the Big Island, with highest cloud tops reaching 49 thousand feet.