Issued: Mar 06, 2015 2:30 AM HST
Water vapor images showed a broad trough of low pressure in the middle atmosphere to the north through northeast of the main Hawaiian islands. Thin high cloud layers associated with the trough partly to mostly obscured lower features within 100 miles of the curve from 23°N 152°W to 23°N 148°W to 23°N 145°W. Lower clouds passing under the trough also developed more vertically.
To the northeast through southeast, a thin, ropy cloud band associated with a front extended across Hawaiian waters within 45 miles of the line from 30°N 145°W to 25°N 148°W and further north.
Cloud layers from a variety of sources mostly obscured lower features between the curve from 30°N 144°W to 28°N 144°W to 26°N 144°W to 19°N 155°W to 23°N 170°W to 19°N 180, and the curve from 15°N 140°W to 12°N 150°W to 11°N 165°W to 06°N 162°W to 02°N 180.
To the south, light to moderate thunderstorm activity continued in the ITCZ from 12°N to 03°N, mostly west of 162°W. However, thunderstorms within 160 miles of the line from 14°N 149°W to 08°N 143°W also may have been part of the ITCZ. Layered middle to high debris clouds from this and earlier convection contributed to the cloud layers described in the preceding paragraph, and also partly to mostly obscured lower features from 11°N to the equator.
Otherwise, cloud cover across Hawaiian waters consisted mainly of cold-air cumuli merging into areas of low to middle stratus overcast. These clouds generally rose to heights of 8000 to 12000 feet, and moved toward the west southwest at 15 to 30 miles an hour.
Across the main Hawaiian islands, thin high cloud layers from the west partly obscured lower features over the Big Island. Where it was visible, lower cloud cover consisted mainly of cold-air cumuli moving ashore and piling up into stratus overcast along slopes facing northwest through northeast. Layered debris clouds from afternoon cumulus buildups on Thursday largely had merged into the surrounding clouds, but remained important, especially over the Big Island. The lower clouds varied in height from 5000 to 12000 feet, while the high clouds approached heights of 30000 feet.
Radar data from near the islands showed areas of rain along, and scattered showers offshore from, north shores of Oahu, Molokai, Maui, and the Big Island. Radar data also showed scattered showers in lee plumes to the south-southwest of Kauai, Oahu, and Maui, and scattered showers offshore well to the southeast of the Big Island. Elsewhere, radar data showed isolated showers at most.
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