Area Forecast Discussion
Issued by NWS Honolulu, HI
Issued by NWS Honolulu, HI
350 FXHW60 PHFO 071337 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 337 AM HST Sat Jun 7 2025 .SYNOPSIS... The high pressure ridge north of the Hawaiian Islands will continue to produce light to moderate trade winds through Tuesday. Easterly trade winds will increase into the moderate to breezy range from Wednesday onward, as the ridge north of the islands strengthens. A fairly stable pattern will keep fair weather conditions in the forecast with only brief passing showers mainly over windward and mountain areas, favoring the overnight to early morning hours. Sea breezes will expand in coverage along terrain sheltered western slopes of all islands. && .DISCUSSION... Fairly stable conditions remain in place over the Hawaiian Islands this morning with stable low clouds drifting into the windward mountain slopes of each island on the trade winds. In the upper level water vapor satellite imagery we see a weak low drifting slowly northward away from the state and the subtropical jet stream just south of the islands outlining an upper level ridge. This jet stream will bring high level cirrus clouds to the state this weekend, likely enhancing sunrise and sunset colors. A weak subtropical ridge north of the state will produce light to moderate easterly trade winds through Tuesday. These lighter large scale winds will allow sea breezes to expand in coverage along the terrain sheltered western slopes of all islands each day. Some clouds and perhaps a few stray showers may develop along trade wind and sea breeze convergence zones in the afternoon hours. The ridge will strengthen by the middle of next week with trade winds increasing back into the moderate to breezy range from Wednesday onward. Fairly stable conditions aloft will keep shower activity to a minimum across the Hawaiian Islands. Trade wind inversion heights will remain in the 5,000 to 7,000 foot range, capping vertical cloud development for much of the forecast period. This means only brief passing showers are possible for most areas for the next seven days. && .AVIATION... The high pressure ridge north of the Hawaiian Islands will continue to produce light to moderate trade winds through Tuesday. A hybrid sea breeze and trade wind pattern will develop over each island, with daytime sea breezes developing along terrain sheltered western slopes of each island. Brief passing showers are possible over windward and mountain areas, favoring the overnight to early morning hours. VFR conditions will prevail through the weekend. No AIRMETs are in effect. && .MARINE... High pressure far northeast will slowly weaken, maintaining gentle to locally fresh trade winds through the rest of the weekend. High pressure looks to rebuild north of the islands by the middle of next week. Surf along south facing shores is continuing to build in and will peak later today. A High Surf Advisory is in effect for south facing shores through 6 PM Sunday. Surf should begin declining through early next week. Surf along east facing shores will remain moderate as the northeast swell slowly declines through the weekend. Surf along north facing shores will remain small through the forecast period, except for a few select areas that may be exposed to the northeast swell today. && .HFO WATCHES/WARNINGS/ADVISORIES... High Surf Advisory from 6 AM this morning to 6 PM HST Sunday for south facing shores of all islands. && $$ DISCUSSION...Bohlin AVIATION...Bohlin MARINE...Walsh