Last Updated on Thursday, 23 May 2013 07:08
Winds Statewide in a glance ...just go HERE (this link is also the 4th drop down under weather)
May 23, 2013 6:45 AM HST
The current south swell will keep lowering, and surf along south shores will remain below advisory levels for the next several days. The northwest swell will gradually diminish through the weekend.
Trade winds will strengthen through the week, and are expected to reach small craft advisory levels over the windier locations near Maui county and the Big Island by Friday night.
A pair of surface troughs to the north will keep winds light today. That will allow sea breezes to produce clouds and showers over interior areas this afternoon. Trade winds will spread over the area tonight as a surface ridge builds north of the area. Trade winds will persist through the coming week. The trades will bring showers to mainly windward areas. A trough aloft may make these showers fairly active.
An upper lvl trough is being observed on wv satellite data, located some 750 miles NE of the main Hawaiian islands. Sfc analyses show two decaying troughs, one just N of the Big Island and the other lingering around 400 miles N of Kauai. Meanwhile, a broad sfc high remains centered far to the NE of the main Hawaiian islands.
The sfc troughs will continue to break down today and allow for an onset of returning trade winds across the islands, but not quick enough in order to override sea breeze circulations this afternoon. Therefore, there should be one more round of convection today with showers favoring interior and mountain areas as sea breezes push inland.
The influence of the upper lvl trough is still keeping tight gradients at the mid/upper lvls, with strong winds around 14-15 kft expected to continue today. Thus, the wind advisory for the Big Island summits is now valid through 6 pm HST this evening, and it may be extended if necessary.
The sfc high NE of the islands will strengthen during the next couple of days. This will bring a trade wind weather regime across the aloha state, starting tonight and becoming moderate to fresh through the end of the week. Global models remain in fair agreement with this overall scenario for the long term forecast, with upstream moisture feeding windward and mauka showers as the trades establish