Hawaiian Islands Satellite Interpretation Message
Mon, 31 Jan 2011 18:30:00 -0600
Based on data through 0000 UTC February 01 2011.
A stable and rather dry air mass covers the central and northwest portion of the area, while a weakening cold front is moving off to the northeast of the main Hawaiian islands.
The front is marked by a 200 mile-wide band of broken to overcast layered clouds centered along 30°N 143°W and 23°N 147°W, with isolated, embedded thunderstorms rising to 39000 ft. The front is travelling to the east around 20 mph and has weakened significantly during the day as a portion of the feature near the Big Island has dissipated.
A stable and rather dry air mass is building in from the west behind the front. Based on low cloud motions, a surface high is centered roughly 350 miles northwest of Kauai. Satellite-derived precipitable water values of 0.5 to 0.6 of an inch cover a vast area west to Midway atoll, southeast to Molokai, and northeast to 30°N 150°W. High pressure aloft building west of the date line is producing stable conditions over these areas.
The dry air mass dominates over all of the main Hawaiian islands, with the exception of the Big Island. Few to scattered, stable, stratocumulus clouds are observed on Kauai and Oahu under a east northeast low level flow. Stable low cloud cover is greater across Maui county, where broken stratocumulus clouds are piled up along northeast facing slopes of Molokai and Maui. Lingering low level moisture left by the dissipated front is maintaining a mix of broken cumulus and stratocumulus clouds across windward Big Island, while afternoon sea breezes have created locally broken low clouds on the middle slopes of Mauna Loa from Keahole Point south to the Kau district.
The upper level trough driving the front is also triggering convection farther east. The upper trough axis passed east of the Big Island at 20 mph late this morning and currently runs along 30°N 147°W to 13°N 157°W. The upper trough is supporting an area of broken layered clouds and isolated thunderstorms with tops to 37000 ft within 100 miles of a line from 19°N 148°W to 14°N 156°W. Additional isolated thunderstorms are found from 20°N to 16°N east of 144°W.
DWROE
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