Sunday, September 21, 2014 596-SURF , 596-WAVE , 922-BONG , 638-RUSH , 572-SURF(MAUI) , 241-SURF (KAUAI) , 324-RUSH (BIG ISLAND)
   
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off 2/20/14; off 3/27. on 4/4. on 7/20/14 off 8/6. On 9/15
off 3/17/14. On 4/10 off 4/22.off 5/1. off 8/15. off 8/21
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Winds Statewide in a glance ...go HERE (this link is also the 4th drop down under weather)

Sep 19, 2014 3:30 AM HST

Synopsis
Light winds through the weekend will allow local land and sea breezes to form. Expect increased clouds and showers across mauka areas each afternoon and evening, followed by clearing at night. Hot and muggy conditions will continue until the return of moderate trade winds early next week. Increasing moisture south of the islands may bring an uptick in rainfall for the Big Island today through the weekend.

Discussion
A weak ridge of high pressure extends from a 1020 mb high near 37°N 138°W through 30°N 160°W and 29°N 180°W, 600 miles or so north of the main Hawaiian islands. A front digging into the northern flank of this ridge between 150°W and 170°W will gradually approach the islands, putting a big dent in the ridge and keeping local trade winds light at least through the weekend.

Satellite loop showed sluggish 10 mph east to west flow across local waters, and broken to overcast clouds noted across mauka areas of the islands yesterday showed that this light flow is not strong enough to prevent the development of afternoon sea breezes. Cloud cover and showers have decreased overnight, leaving mostly clear skies across much of the state this morning. Little has changed since yesterday and we expect a convective pattern to repeat each day through the weekend, with clouds and showers increasing each afternoon and evening, followed by clearing late at night.

Models show the front will push to the east Sunday, allowing the ridge to strengthen to our north. We expect light trades will return to the eastern half of the state Sunday. However, most leeward areas will still experience sea breezes as the trades filter in. Relief from the current hot and muggy conditions should come Monday as the ridge continues to strengthen and moderate trade winds build in.

Rainfall and humidity may pick up over windward and southeast sections of the Big Island today through Sunday as an area of tropical moisture skirts by to the south.

Aviation
Weak trade wind flow overnight will be replaced by gentle sea breezes this afternoon. Mostly cloudy skies will persist along windward slopes of the Big Island through the remainder of tonight, tomorrow, and beyond. Elsewhere, expect increasing clouds beginning early this afternoon and lingering through most of the evening due to diurnal convection. Isolated MVFR cigs possible in passing showers today, especially windward Big Island. Otherwise prevailing VFR expected all areas.

Marine
Small southerly swells will continue through the period. A short- period 2-foot northwest swell will last through the weekend. Another small NW swell is due Wednesday.

Winds will remain light through the weekend with trade winds picking up next week.

Watches/Warnings/Advisories
None.

 

 

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