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Satellite Interpretation Message

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Issued: Aug 29, 2014 7:30 PM HST

Based on data through 7:00 pm Aug 28 2014 HST

The most noticeable low level weather feature in the central north Pacific is a broad anticyclonic circulation. This circulation, actually a subtropical ridge, has an axis extending east to west along about 40°N. South of the ridge axis, satellite loop shows low level flow is generally from east northeast to west southwest, including across local Hawaiian waters. Low level flow north of the ridge axis is generally from west to east.

A sharp upper trough, with an axis extending through 34°N 140°W, 31°N 160°W and 29°N 180°W, has triggered isolated cumulonimbus west of 171°W between 28°N and 32°N and an area of broken to overcast layered clouds west of 172°W between 35°N and 38°N. This upper trough has not moved much over the past 24 hours.

Satellite loop shows a pair of lows embedded within easterly flow to the south of the low level ridge axis. One of these, near 31°N 152°W, is the remnant circulation of tropical depression Lowell and consists of broken stable low clouds. A second swirl of low clouds is noted near 21°N 153°W, about 160 miles northeast of the Big Island and 310 miles east of Oahu.

Cloud cover which formed across the islands this afternoon have begun to slough off across adjacent leeward waters this evening. Overcast low clouds are noted across leeward waters from Oahu to Maui, and across waters south and southwest of the Big Island. Remaining leeward waters and all windward waters have scattered low clouds to clear skies. Cloud cover has begun to decrease across land areas, with only patchy broken low clouds noted across leeward Kauai and the Koolau and Waianae summits of Oahu. Molokai appears to be mostly clear, but nearby Lanai has broken to overcast low clouds. Patchy broken low clouds cling to windward Haleakala slopes on Maui. Overcast low clouds persist across Kau and Kona shores and slopes on the Big Island, while the rest of the Big Island seems to have scattered low clouds to clear skies. Satellite loop shows low clouds are moving across local waters generally toward the west southwest at 10 mph.

Hawaii Infrared Satellite image for 0500 UTC

Central Pacific Infrared Satellite image for 0500 UTC