Last Updated on Tuesday, 15 April 2014 11:50
Issued: Apr 15, 2014 7:30 PM HST
Latest water vapor and infrared satellite data shows a weakening upper level low centered around 24.3°N 144.3°W, or about 700 miles NE of the Big Island, .slowly drifting NE. A cluster of active thunderstorms is being observed surrounding the area of the upper low with cloud tops reaching 38 thousand feet.
Closer to the main Hawaiian islands, scattered to locally broken low clouds prevail over much of the Big Island, except for mostly clear conditions being observed at altitudes above 7 thousand feet. Overcast low clouds cover much of the leeward coastline from Kona down to Milolii. On Maui county, generally scattered to locally broken low clouds with isolated showers prevail over windward areas of Maui and Molokai, including the interior W Maui mountains. On Oahu, mainly broken low clouds prevail across the island except right along the leeward coastline from Ewa beach to Makaha valley where mostly clear conditions prevail. Portions of the Koolau range remain overcast with scattered showers, some of which are reaching leeward areas at times. On Kauai county, broken low clouds linger over windward and interior areas of Kauai.
Elsewhere, in general, scattered to locally broken cumulus and stratocumulus clouds prevail across the area. Individual cloud motion E of 170°W is to the WSW at 15 to 20 mph, and becoming more westerly from 170°W to 180. Far SE of the islands, an 800 mile-wide swath of overcast layered clouds with embedded active thunderstorms is centered around a line from 02.0°N 158.1°W to 16.3°N 140.0°W. A large cluster of embedded thunderstorms is centered around 08.1°N 151.2°W, or about 820 miles SE of the Big Island. Thunderstorm cloud tops are reaching 47 thousand feet. Cloud motion within the swath of layered clouds is to the NNE at up to 60 mph, but the swath itself is slowly drifting NNE.
A large cluster of thunderstorms cover the area near the intertropical convergence zone, or ITCZ, between 01°N to 08°N and 170°W to 180, or about 1600 miles SW of Oahu. Tower cumulus tops are pushing 52 thousand feet.