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The Honolulu Advertiser
Posted on: Tuesday, March 23, 2010

Big waves, possible heavy showers in Hawaii forecast


Advertiser Staff

Hawaii news photo - The Honolulu Advertiser

A high-surf advisory is in effect on all islands today.

NWS Honolulu chart

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A high-surf advisory is in effect for north- and west-facing shores on Niihau, Kauai, Oahu, Molokai and Maui, and north-facing shores on the Big Island.

Waves are expected to be in the 20- to 24-foot range on Niihau, Kauai, Oahu, Molokai and Maui, and 10 to 15 feet on the Big Island.
The National Weather Service says the advisory will remain in effect until 5 p.m. tomorrow.
Meanwhile, unstable atmospheric conditions could deliver locally heavy showers this afternoon.
"Land breezes have formed overnight across the state and most showers have been pushed offshore," the weather service says in its forecast discussion. "A broad area of cirrus continues to spread over the state in response to an upper level trough west of the state. Radar shows a thin line of heavier showers located north of Molokai drifting toward the NW, and a smaller area of showers located 50 miles south of Oahu moving slowly SE. ...
"Aloft, the upper trough to the west is bringing in colder air over the state thereby destabilizing the atmosphere. The unstable atmosphere will allow showers that do form to be bigger rain producers than normal. ... "
Otherwise, it will be partly sunny day, with scattered windward and mountain showers and isolated leeward showers.
Highs will be 80 to 85 degrees, with easterly winds at 15 mph.

On the Net:
www.prh.noaa.gov/hnl/