FXHW60 PHFO 191941 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 941 AM HST Tue Aug 19 2025 .UPDATE... Updated fire weather section. See below for details. && .SYNOPSIS... Moderate to locally breezy trade winds will continue through the week as high pressure builds over the region. Another plume of moisture looks to bring a slight increase in windward and mauka showers on Wednesday. Otherwise, expect a gradual drying trend through the week, with typical summertime trade wind weather. && .DISCUSSION... Radar and satellite imagery show some low level clouds and scattered showers moving across the state this morning. Windward and mauka showers expected across the state through the overnight and early morning hours. High pressure will continue to build over the islands with moderate to locally breezy trade winds continuing through the week. Guidance continues to show another plume of moisture moving across the islands on Wednesday which may bring a slight increase in clouds and showers over windward and mauka areas. Otherwise, the gradual drying trend will continue through the week with the typical summertime trade wind weather (dry and stable conditions). With dry and breezy conditions expected later this week we will see elevated fire weather concerns, especially across leeward areas. && .AVIATION... Moderate to locally breezy trades expected through the forecast period. Low cigs and SHRA possible over windward and mauka areas. MVFR conds possible in SHRA, otherwise VFR prevails. No AIRMETs are in effect at this time. && .MARINE... A ridge of high pressure far north of the state will maintain fresh to locally strong trade winds throughout the forecast period. A Small Craft Advisory (SCA) is in effect for the windier waters and channels around Maui County and the Big Island through tonight and will likely persist throughout the week. A series of small, medium period south (170-190 degree) swells are expected throughout the week with surf holding near the summer average. Surf heights should decrease Sunday into early next week as these swells fade. Choppy conditions will continue for east- facing shores through the forecast period due to the persistent fresh trades. Surf along north facing shores will remain flat to tiny through the forecast period. Peak high tides associated with the lunar cycle will lead to minor coastal flooding along shorelines and low lying coastal areas this afternoon and likely peaking Wednesday and Thursday afternoons. A Coastal Flood Statement has been issued for minor coastal flooding this week. && .FIRE WEATHER... Moderate to locally breezy trade winds are expected this week as high pressure builds over the state. Satellite imagery and latest guidance shows direr air filtering into the region today and again later this week from Thursday onward as inversion heights lower to around 5,000-6,000 feet. Despite lowest relative humidities dipping as low as the mid 40s during the afternoon hours, wind speeds look to be a limiting factor, so not anticipating any fire weather headlines at this time. && .HFO WATCHES/WARNINGS/ADVISORIES... Small Craft Advisory until 6 AM HST Wednesday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters. && $$ DISCUSSION...Walsh AVIATION...Walsh MARINE...Shigesato FIRE WEATHER...Vaughan