Issued: Aug 20, 2014 2:30 AM HST


Based on data through 2:00 am Aug 20 2014 HST


A center of low pressure was nearly stationary about 850 miles south of Honolulu. Irregular, pulsing thunderstorms continued to develop around the low, but this feature changed little in organization during the past 24 hours.

To the northwest, isolated towering cumuli developed within 90 miles of the point 30°N 170°W.

To the south, light to moderate thunderstorm activity continued in the ITCZ from 15°N to 04°N. Middle to high layered debris clouds from this and earlier convection mostly to partly obscured lower features from 18°N to 01°N, primarily east of 168°W.

Otherwise, cloud cover across Hawaiian waters consisted mainly of moderately packed marine stratocumuli locally merging into areas of nearly solid low to middle overcast east of 153°W. Individual small cumuli also were present throughout. These clouds increased in areal coverage with time during the past six hours. They generally rose to heights of 8000 to 10000 feet, though taller cumuli approached 15000 feet. These clouds typically moved toward the west southwest at 15 to 20 miles an hour.

Across the main Hawaiian islands, cloud cover consisted mostly of marine stratocumuli and cumuli moving ashore along slopes facing north through east, especially on Maui and the Big Island. Layered debris clouds from afternoon cumulus buildups on Tuesday largely had dissipated or moved offshore on the land breezes, although they redeveloped significantly in places just offshore along the west coast of the Big Island. These clouds varied in height from 6000 to 10000 feet.

Radar data from near the islands showed scattered showers offshore along the west coast of north Kona district on the Big Island, offshore along the northeast coast of north Kohala district on the Big Island, over northeast Kauai, along the north-central coast of Maui, and in the lee plumes well offshore to the west southwest of Maui and Hawaii counties, but isolated showers at most elsewhere.

Hawaii Infrared Satellite image for 1130 UTC

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RYSHKO