670 
fxhw60 phfo 181930 
afdhfo 


Area forecast discussion 
National Weather Service Honolulu HI 
1000 am HST Friday Jul 18 2008 


Synopsis... 
brisk trade winds continue due to the strong high pressure center 
far north of the state. Weather will be a little wetter this weekend 
than would normally be expected for middle Summer due to an upper level 
trough. 


&& 


Discussion... 
overnight shower activity was relatively widespread across the 
islands...mainly windward and near mountains as well as just leeward 
of mountains and also over windward Big Island in the Hilo district. 
Rain gages reported around one quarter to one half inch of 
precipitation in the 6 hours ending at 8 am at a number of locations 
on Kauai Oahu and windward Maui. Satellite imagery shows showery and 
somewhat unstable appearing clouds this morning moving onto the 
islands from Oahu to The Big Island. Saturday in particular is apt 
to again be showery. A short wave rotates through the middle 
atmospheric upper low on Saturday which will supply additional 
strength to the passing trade showers. These showers will at times 
also affect the Lee areas. 


A relatively strong surface high north of the main Hawaiian islands 
will maintain moderate to fresh trade winds through next week. The 
morning balloon soundings show the temperature inversion ranges from 
9 to around 11 thousand feet...allowing for enhanced shower 
activity. The brisk easterlies through the low level of the 
atmosphere should keep showers moving enough to prevent any 
significant flooding problems. Models agree in carrying remnant 
moisture from the former tropical system Elida across or just south 
of the islands Wednesday. 


Wind Advisory will likely be issued for The Summit area of Haleakala 
for today and perhaps into this evening. Winds have increased to 
just above the 30 miles per hour criteria due to strength of surface high to 
the north. 


&& 


Marine... 
trade winds still strong enough today and tonight for Small Craft 
Advisory for several of the typically windier areas. Current south 
swell decreasing but another small south swell is expected Sunday. 


&& 


Hfo watches/warnings/advisories... 
Small Craft Advisory for pailolo and alenuihaha channels...Maalaea 
Bay and waters south of The Big Island. 


&& 


$$ 


Hoag