Issued: May 28, 2016 8:30 AM HST
Based on data through 8:00 am May 28 2016 HST
Water vapor imagery reveals an upper level trough with its axis running from 40°N 157°W to 27°N 159°W to 18°N 174°W. The upper trough as well as ample moisture is helping to support a surface front from 40°N 149°W to 26°N 160°W. North of 30°N, the layered cloud band associated with the front is approximately 250 miles wide with tops to 40 thousand feet. Between 30°N and 26°N, the frontal band tapers to a 125 mile wide band near 30°N to a 50 mile wide band near 26°N. Clouds tops also gradually lessen, from 40 thousand feet near 30°N to 20 thousand feet near 26°N. South of 26°N, the front transitions to a nearly stationary surface trough, running from 26°N 160°W to 22°N 163°W.
Low level satellite derived winds place the center of a surface high near 37°N 137°W with its associated ridge extending southwest to 24°N 157°W, or about 200 miles north of Oahu. East of 150°W, broken stratocumulus /sc/ are generally moving to the west between 15 and 25 mph. Between the area north of the main Hawaiian island, the front, and 150°W, overall cloud motion is to the northwest and north. Elsewhere in the area, scattered sc and cumulus /cu/ are moving to the west between 15 and 25 mph.
Over the main Hawaiian islands this morning, low level showery clouds linger along the north and east slopes of Oahu Molokai and Big Island. On Maui and Kauai, low clouds are lingering along the southeast shores and slopes. Other areas on the Big Island have broken clouds, but keeping the summits clear. The remaining areas on the smaller island have few level clouds.
A long swath of cirrus /ci/ is being pulled north and eastward from scattered thunderstorm convection along the inter-tropical convergence zone /itcz/ found south of 10°N. The 400 mile wide band of CI runs from 10°N 163°W to 19°N 140°W, passing over the Big Island.