Issued: Sep 19, 2014 7:30 PM HST
Based on data through 7:00 pm Sep 19 2014 HST
Latest water vapor imagery shows an upper level trough NE of the state, with an axis around from 30°N 147°W to 21°N 154°W. An associated field of patchy thin cirrus and cirrocumulus clouds is located N of 27°N from 140°W to 146°W.
Meanwhile, a large area of broken to overcast layered clouds can be observed about 450 miles s/se of the Big Island, associated with a low pressure system. A second weaker low remains around 620 miles SE of Hilo with scattered cumulus and cumulonimbus clouds embedded within the layered clouds. A small cluster of active thunderstorms is centered around 11.1°N 153.6°W, or about 600 miles S of Hilo, with cloud tops reaching 44 thousand feet.
Closer to the islands, broken to overcast low clouds remain over much of the Big Island with localized heavy showers affecting the saddle area and the interior slopes of Mauna Loa. Scattered showers also linger over the N Kohala district, and the leeward coastline from Captain Cook to Milolii. On Maui county, broken low clouds cover the leeward and interior slopes of Haleakala with lingering showers around Ulupalakua. Additional patches of broken low clouds and passing showers can be observed near Hana and hamoa. Scattered to locally broken low clouds also linger over the W Maui mountains. Broken low clouds cover much of the E half of Molokai, leeward Lanai and most of Kahoolawe. On Oahu, broken to overcast low clouds with localized heavy showers linger across windward areas from Kahuku to Kaneohe. Broken low clouds with scattered showers prevail over central and SE areas, including the Honolulu metro area. On Kauai county, broken to overcast low clouds with localized heavy showers cover most of Kauai.
Elsewhere, scattered to locally broken cumulus and stratocumulus clouds can be observed across the area N of 10°N with individual cloud elements moving W at around 10 mph.
Far S of the island chain, deep convection with embedded thunderstorms extends along the intertropical convergence zone, or ITCZ, between 02°N to 08°N with cloud tops reaching 50 thousand feet.