Issued: May 21, 2013 2:30 AM HST
An area of broken to overcast layered clouds covers an area bounded by 35°N 153°W 30°N 146°W 24°N 150°W 30°N 157°W 35°N 153°W, describing an arc 470 to 900 miles north northeast of the main Hawaiian islands. These clouds mark the northeast semicircular flank of a low near 28°N 156°W, about 490 miles north of the islands. Broken to overcast showery low clouds extend southwest from this layered cloud arc across the island chain, mainly affecting the islands of Maui county and waters adjacent to the Big Island.
Low clouds affecting the main Hawaiian islands are loosely organized into a series of northeast to southwest oriented bands, with the thickest band extending across Maui county. Radar shows isolated moderate to briefly heavy showers within this band, which also separates northerly winds across Kauai and Oahu from southerly winds across and around the Big Island. One particularly heavy shower is noted within the Alenuihaha channel moving slowly toward the northeast.
Kauai remains completely covered by broken to overcast low clouds, but Oahu appears to have almost completely cleared from last evening. A recently-formed patch of broken high clouds is blocking a good view of low clouds across Maui county, but earlier imagery showed the western half of Molokai has only scattered low clouds to clear skies. The view of low clouds across Maui and Lanai is blocked. The Big Island, like Oahu, appears to have completely cleared since last evening. Satellite loop shows low clouds are moving no faster than 10 mph on either side of the cloud band across Maui county.