Hawaiian Islands Satellite Interpretation Message
Sun, 28 Nov 2010 23:30:00 -0600
Based on data through 0500 UTC November 29 2010.
Thin, broken to overcast high, cirrus, clouds cover the main Hawaiian islands. The cirrus over the island is quite thin.but is still enough to partly obscure the view of lower level features on nighttime infrared satellite imagery. Before sunset, visible imagery showed broken to overcast low clouds over Lanai and over windward areas of the rest of the smaller islands. Low clouds were scattered over lower lee areas of Kauai, Oahu, Molokai and Maui. On the Big Island before sunset, clouds covered most of the island, except the very summits of Mauna Kea and Mauna Loa, and along the coast from Upolu Point to Hilo to Apua Point and from Kailua-Kona to Upolu Point. Radars show scattered moderate showers over the windward slopes of Kauai, Oahu, Molokai and and Maui, but only isolated light showers over the Big Island.
Satellite loops show showery scattered to broken low clouds moving from slightly north of east at 20 mph. Radars show moderate showers in these clouds. There are only isolated low clouds immediately upstream of the Big Island of Hawaii. A cloud vortex or spiral is centered 225 miles northeast of Hilo at 22.5°N 153°W. This feature has been moving slightly north of west at 9 mph. There are showery broken low clouds within 75 miles in the east semicircle of the vortex and scattered towering cumulus clouds with tops to 25000 ft in the west semicircle.
Water vapor imagery shows a persistent high amplitude pattern over the central north Pacific with active weather east and west of the main Hawaiian islands. One low aloft is centered 465 miles northeast of Hilo at 23°N 149.5°W. There are broken middle and high clouds and isolated towering cumulus clouds from 23°N to 27°N between 140°W and 150°W and overcast layered clouds and scattered cumulonimbus clouds with tops to 50000 ft from 15°N to 23°N between 141°W and 148°W. Over the past several hours the low has moved north at 10 mph. The clouds north of 23°N have thinned and become less active and the clouds from 15°N to 23°N have thickened and the convection has become more active over the past several hours.
A second low aloft is centered 1040 miles west of Kauai at 21°N 176°W, an unlike the low east of the islands, the western low extends down to the surface. Over the past several hours the low has moved slowly toward the southeast. There are broken layered clouds from 18°N to 30°N between 165°W and 177°W. A 135 mile wide band of scattered cumulonimbus clouds with tops to 45000 ft curves from 19°N 170°W to 22°N 170°W to 25°N 175°W.
There is a ridge aloft between the low west of the main Hawaiian islands and the one to the east. A jet stream curves over the top of the ridge from 12°N 180°W to 15°N 170°W to Kauai to the Big Island to 15°N 145°W. Broken to overcast high clouds south associated with the jet cover the main Hawaiian islands.
DONALDSON
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