Area Forecast Discussion
Issued by NWS Honolulu, HI
Issued by NWS Honolulu, HI
621 FXHW60 PHFO 251341 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 341 AM HST Tue Jun 25 2024 .SYNOPSIS... A stable trade wind pattern will persist through the week with breezy to locally windy trades. Periodic light showers will focus over windward and mauka areas during this time. An increase in shower activity is possible over the weekend as an upper-level disturbance approaches the region. && .DISCUSSION... A 1029 mb surface high remains approximately 900 miles north- northwest of the islands this morning. Stable conditions continue across the region, with this morning`s soundings showing a sharp trade wind inversion combined with limited low-level moisture and dry air aloft. Radar and satellite imagery continue to show mainly dry conditions across the state, with periodic light showers over the typical windward and mauka areas. Expect these conditions to continue today under breezy to locally windy trades. High pressure looks to weaken slightly over the next couple of days. This should relax our local pressure gradient a bit, but impulses of moisture embedded in the trade wind flow will keep breezy trades to locally windy trades going through the week. Passing light showers will continue to favor windward and mauka areas with meager rainfall accumulations likely. Aside from some brief afternoon/evening showers over Kona slopes of the Big Island leeward areas will remain mostly dry. Conditions start to change going into the weekend as guidance continues to show an upper-level disturbance moving across the islands. The increase in instability, combined with bands of moisture embedded in the trade wind flow, will help to enhance shower activity across windward and mauka areas this weekend and into early next week. && .AVIATION... Breezy trade winds will slowly ramp back up to locally windy conditions tonight. SHRA and brief MVFR conditions should stay confined to windward/mauka locations. AIRMET Sierra for mtn obsc has been cancelled but may be needed again later today as another band of showery low clouds approaches. AIRMET Tango remains in effect for mod low-level turb over and downwind of island terrain due to the breezy trade winds. && .MARINE... Surface high pressure far north of the state will maintain moderate to locally strong easterly trades through today. Trades will gradually weaken to gentle to fresh Thursday into Friday as the high pressure gradually weakens north of the state. A Small Craft Advisory (SCA) for the typical windier waters around Maui County and the Big Island remains in effect through early Wednesday morning where winds will remain strong. Rough and choppy surf along east-facing shores will persist through today before gradually trending down Wednesday through Thursday. A small, medium-period, south swell will peak today before gradually trending down tonight and Wednesday. Another small, medium- to long- period south swell will fill in Wednesday night and peak Thursday before gradually easing into the weekend. A small, medium-period, northwest swell will bring a tiny boost to north shore surf through today. Another small, medium period, northwest swell could fill in late Wednesday and peak Thursday night before gradually trending down into the weekend. && .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...Ahue AVIATION...Shigesato/Powell MARINE...Almanza