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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Friday
• 
• High: 84 °
• Low: 70 °
• Rain Showers

• Saturday
• 
• High: 84 °
• Low: 72 °
• Partly Cloudy

• Sunday
• 
• High: 84 °
• Low: 70 °
• Partly Cloudy

• Monday
• 
• High: 84 °
• Low: 70 °
• Chance of Rain

• Tuesday
• 
• High: 84 °
• Low: 70 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Honolulu HI 
330 am HST Friday may 24 2013 


Synopsis... 
trade winds will strengthen and prevail across the main Hawaiian 
islands...with periods of locally breezy conditions. Showers will 
favor windward and mountain areas. The trade wind pattern is 
expected to prevail through early next week. 


&& 


Discussion... 
a broad surface high pressure system centered far NE of the Aloha state 
will keep trade winds across the main Hawaiian islands during 
the next several days. Meanwhile...WV satellite imagery shows an 
upper level trough far north of the island chain...which is slowly 
migrating east and allowing for pressure gradients aloft to become 
more relaxed. Wind speeds over The Big Island summits are now below 
advisory levels and should remain so for the rest of the forecast 
period. Therefore...the Wind Advisory has been cancelled. 


The global models remain in fair agreement...showing the trough 
aloft migrating into the epac and allowing for upper level ridging to 
build to the north/northwest of the islands. At the surface...the high will 
continue to expand across the north cpac and bringing stronger trades 
through the weekend. Locally breezy conditions will begin developing 
today...and continuing through the rest of the Holiday weekend and 
into early next week. 


As the trade wind pattern establishes across the islands...the 
focus for shower activity will shift to windward and Mauka areas. 
Lingering moisture and daytime heating instability will keep chances 
for more active trade showers today and tonight. 


&& 


Aviation... 
the Hawaii terminals will remain mainly VFR with isolated MVFR 
ceilings and visible over windward areas. As the trade 
winds strengthen...moderate low level turbulence may develop 
today and require an airmet. 


&& 


Marine... 
the S swell will keep decreasing with surf along S shores remaining 
below advisory levels during the next several days. The northwest swell 
will gradually diminish through the weekend. 


The trades will reach Small Craft Advisory levels over the windier 
locations near Maui County and The Big Island today. Therefore...a 
Small Craft Advisory is in effect for those marine zones through 
Sunday. 


&& 


Hfo watches/warnings/advisories... 
Small Craft Advisory until 6 am HST Sunday for the windier waters 
around Maui County and The Big Island. 


&& 


$$ 


Discussion/marine...reynes 
aviation...Morrison