Satellite Interpretation Message

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Issued: Sep 30, 2016 8:30 AM HST

Based on data through 8:00 am Sep 30 2016 HST

An east-west oriented band of showery low clouds extends 150 to 200 miles north of 20°N with its western end about 100 miles east of Hilo. These clouds were moving westward at about 20 miles per hour. The band bends east-southeastward to the east of 148°W and merges with the cloud field associated with the remnant circulation of former tropical cyclone Ulika centered about 800 miles east of Hilo.

Far to the west, water vapor images show a large northeast to southwest aligned upper level trough with an axis along 30°N 169°W through 21°N 180. The trough is helping produce and spread a large area of broken to overcast high clouds mainly between 08°N and 20°N from 170°W to 145°W. A few patches of these clouds clouds are moving over the main Hawaiian islands this morning.

Over the islands, cloud cover was generally in a distribution expected with trade wind conditions with broken to overcast low clouds over most of the windward slopes and few to scattered low clouds over leeward areas. Kauai was the main exception with a patch of showery low clouds moving across the island resulting in broken to overcast skies over the entire island.

Far to the south, the intertropical convergence zone, ITCZ, has thunderstorm activity in the belt between 08°N and 14°N to the west of 150°W. Maximum cloud tops are reaching 50000 to 55000 ft based on infrared temperatures.

Hawaii Infrared Satellite image for 1800 UTC

Central Pacific Infrared Satellite image for 1800 UTC