Issued: Oct 25, 2016 8:30 AM HST
Water vapor imagery from this morning shows a nearly stationary upper level low centered near 23°N 177°W. This feature is helping to support towering cumulus /tcu/ from 20°N to 25°N and between 171°W and 179°W with isolated cumulonimbus /cb/ flaring and an area of layered clouds from 18°N to 20°N and between 174°W to 178°W with a dense cluster of CB with tops to 45 thousand feet.
Water vapor imagery also shows a broad upper level trough with its axis from 48°N 138°W to 27°N 147°W dipping into the area. Visible satellite imagery shows an overcast layered frontal band with its leading edge from 35°N 130°W to 30°N 136°W to 26°N 147°W to 27°N 156°W to 30°N 163°W. The band is about 125 miles wide, except near 27°N 144°W where a pocket of layered clouds is being pushed into the front and tops are near 40 thousand feet. East of 143°W tops range from near 15 thousand feet to 30 thousand feet. West of 146°W the frontal band weakens and tops are near 10 thousand feet. The frontal band is moving to the southeast near 25 mph.
A second weaker frontal band parallels the aforementioned band and the leading edge runs from 33°N 130°W to 30°N 133°W to 26°N 140°W to 24°N 148°W. West of 140°W the frontal band is very weak and comprised of scattered cumulus /cu/ with tops no higher than 10 thousand feet. East of 140°W, the frontal band is broken to overcast cu with tops up to 12 thousand feet.
Convection remains active south of the state along the intertropical convergence zone /itcz/. Widespread TCU and CB are between 07°N and 15°N from 156°W to 180°W. Maximum cloud tops in this region are near 52 thousand feet. Isolated TCU and CB are flaring between 07°N and 15°N from 140°W to 156°W. Maximum cloud tops are upwards of 45 thousand feet in this reagion. Cirrus /ci/ blow off spreads north to 18°N.
The north and east slopes of Kauai Oahu and Molokai have scattered to broken low clouds with the remaining areas being clear. The Big Island is clear, except for a small patch of clouds in the Puna district. A broken to overcast area of low clouds are in the Alenuihaha channel and waters north of the Big Island and Maui. Overcast clouds are along the north and east slopes of Haleakala and the west Maui mountains. The south coast of Haleakala also has broken low clouds.