Issued: Sep 30, 2014 7:30 PM HST
A large trough far NW of the main Hawaiian islands is pushing a frontal cloud band towards the area. The leading edge of this band of stratocumulus and layered clouds with embedded thunderstorms extends from 30.0°N 162.4°W to 24.8°N 167.8°W. The front is slowly migrating SE at around 10 mph. Associated broken layered clouds cover the area N of 15°N from 165°W to 180.
Closer to the islands, scattered to broken high cirrus clouds are streaming from the WSW across the S half of the Big Island. Broken low clouds linger across the leeward Big Island slopes, and over the SE slopes of Mauna Loa from wood valley to Naalehu. On Maui county, scattered to locally broken low clouds with a few showers can be observed over the leeward slopes of Haleakala, Maalaea Bay and the W half of Molokai. On Oahu, broken low/mid clouds cover much of the island with a couple of thunderstorm cells and localized heavy rain lingering around aina haina and kailua-kaneohe, with cloud tops 36 thousand feet. On Kauai county, broken low clouds from earlier cells are now becoming scattered across Kauai.
Elsewhere, scattered to broken cumulus and stratocumulus clouds over the area N of 10°N from 140°W to 160°W. A line of small active thunderstorms extends about 190 miles NE from just N of Kauai, with highest cloud tops around 35 thousand feet. Latest water vapor satellite imagery depicts a weakening closed upper low NE of the Big Island, about 240 miles NE of Hilo.
Far S of the island chain, a very active intertropical convergence zone, or ITCZ, is showing deep convection and mainly broken to overcast layered clouds along most of the area S of 14°N. A large cluster of active thunderstorms is centered around 08.5°N 145.1°W, or about 1000 miles SE of the Big Island, with highest cloud tops reaching 52 thousand feet.