Hawaiian Islands Satellite Interpretation Message
Sun, 19 Dec 2010 23:30:00 -0600
Based on data through 0500 UTC December 20 2010.
The Hawaiian islands remained under a shroud of multi-layered clouds this Sunday evening. These clouds that were covering the islands were part of a large swath of similar clouds that covered much of the region from the islands west toward the international dateline. The bulk of the cloud mass was within a triangular shaped region. The south edge of this region ran from 08°N 180°E to 25°N 140°W. The west edge extended from 11°N 180°E to 22°N 170°W to 26°N 180°E to 30°N 180°E. The north edge was roughly along 30°N latitude from the dateline through 140°W longitude.
Water vapor imagery showed a mid to upper level low near 26°N 175°W was moving slowly northeast and showing some slight signs of weakening. Hidden beneath the mass of clouds was a low level convergence zone along which much of the unstable, wet weather was occurring.
The low level convergence zone extended roughly from 09°N 180°E to 15°N 170°W to 20°N 167°W to 28°N 168°W. Isolated thunderstorms were forming along this convergence zone mainly from 09°N to 22°N latitudes. The coldest cloud tops near the thunderstorms were -71 degrees celsius which related to heights of nearly 45000 feet.
Another weaker area of low level convergence, as evidence by the flow of low clouds on earlier visible imagery, was roughly from 17°N 158°W to near 24°N 157°W. This convergence zone ran north to south across the state. An isolated thunderstorm or two was noted south of the state. One storm about 55 miles south-southwest of Maui at 7 pm. The storms in the area were drifting toward east-northeast while lower clouds and showers were moving toward the north.
A weak front extended through 25°N 140°W to 25°N 150°W to near 26°N 160°W. The front was drifting slowly southward. The associated cloud band north of the front was just over 300 miles wide.
A weak out of season tropical storm developed near the dateline around 20°N recently. Currently the storm was near 20°N 179°W and moving east-northeast near 15 miles an hour.
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