Issued: Oct 23, 2016 8:30 AM HST
Water vapor imagery shows an upper level low near 21°N 173°W, moving to the west at 10 to 15 mph. Isolated cumulonimbus clouds are located within 300 miles southeast through west of the low. Cloud tops extend up to 30000 ft. Additional towering cumulus clouds are located within a 500 mile semicircle southwest of the low. These clouds are moving to the west at 20 to 30 mph. Scattered to broken cirrocumulus clouds are located within a 400 mile semicircle northeast of the low. These high clouds are moving to the northwest at 30 mph.
South of this area, a band of high clouds associated with an upper level jet is located south of a line from 20°N 150°W to 14°N 180°. This band is composed of cirrus and cirrostratus elements. The overall band is moving to the east at 30 mph, while individual cloud elements are moving to the northeast at 50 mph. Scattered cumulonimbus clouds are located south of 12°N west of 170°W. Cloud tops extend up to 54000 ft. Additional isolated cumulonimbus clouds are located south of 12°N east of 170°W.
Patchy areas of low clouds are embedded in the trade wind flow. These clouds are composed of stable stratocumulus and closed cell cumulus elements north of 26°N, and transition to more showery open cell cumulus elements south of 26°N. Based on low-level cloud motions, a ridge extends from 30°N 159°W to 25°N 140°W. North of the ridge, clouds are moving to the southeast and south at 10 to 15 mph. South of the ridge, clouds are moving to the southwest and west at 15 to 25 mph.
Across the main Hawaiian islands, broken low clouds cover the interior and eastern sections of Kauai, and the slopes of the Koolau range on Oahu. Broken low clouds cover much of Molokai, from Molokai airport eastward, and extend offshore across the adjacent channels south and east as well. Broken low clouds cover the interior of the west Maui mountains, and the windward slopes of Haleakala from nahiku to Hana to Kipahulu below 6000 ft. An area of low clouds extends across the Alenuihaha channel as well as 50 miles offshore to the northeast, and are part of a band that extends over 200 miles upstream to the east.
On the Big Island, broken to overcast low clouds cover the windward slopes of the Kohala range, and coastal sections of Hamakua district. Scattered to broken clouds cover much of north and south Hilo and Puna districts, and extend up to 8000 ft. An area of broken to overcast low clouds covers portions of Kau district west of Pahala below 6000 ft. Broken low clouds cover portions of north and south Kona districts between Kailua-Kona and Milolii below 5000 ft.