| Current Conditions | ||
| Temp |  | 4.2 C |
| RH | | 15 % |
| Wind | | NNE 24 mph |
| Road | | Open (4x4) |
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Hawaiian Islands Synoptic Discussion and Guidance 573 FXHW60 PHFO 290157 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 357 PM HST Thu May 28 2020 .SYNOPSIS... Breezy trade winds with mainly windward showers are expected into next week. Increasing shower coverage is possible Tuesday night into Wednesday as enhanced moisture rides in with the trades. && .DISCUSSION... A high pressure ridge to the north will maintain breezy trade winds through the weekend and into next week. Limited showers will focus over windward and mountain areas as the trades push moisture into the windward mountain slopes. Some brief showers will reach leeward locations as well with the best chances overnight and into the early morning hours. Models are anticipating an old frontal boundary to bring increased trade winds showers Tuesday night into Wednesday as the moisture works through the island terrain. Some high clouds will linger through tonight with an upper low spinning well south of the state. The low and associated high clouds are expected to exit the area tonight and Friday. && .AVIATION... High pressure northeast of the state will keep moderate to locally strong trades across the islands. Thus, isolated to scattered shower activity will be mainly concentrated along windward coasts and slopes and most prevalent overnight into early morning. Periods of MVFR conditions may occur at times due to lowered ceilings and reduced visibility from SHRA. No AIRMETs are currently in effect or expected through Friday. && .MARINE... Moderate to occasionally locally strong trade winds are expected to persist through the weekend. The current high pressure north of the islands will be replaced by another high tomorrow. The Small Craft Advisory (SCA) has been extended through Friday afternoon for the typical windier areas near Maui and the Big Island after the morning ASCAT pass showed a large area of 25 kt winds through the Alenuihaha Channel. Winds are expected to weaken a bit this weekend, but remain near SCA levels. Stronger trades are possible early next week, which would likely require another SCA for the typical windier areas. A long period south-southwest swell is expected tonight, which will boost surf along south facing shores. A larger south- southwest swell is expected early next week, which could bring surf along south facing shores to High Surf Advisory levels Tuesday and Wednesday. This swell is expected to pass the PacIOOS buoy off of American Samoa tonight, which will give us a better idea of potential size. A series of small northwest to north swells will maintain small surf for north facing shores into next week. Surf along east facing shores will remain below seasonal normal through early next week then possibly build back to around normal if trade winds strengthen. && .HFO WATCHES/WARNINGS/ADVISORIES... Small Craft Advisory until 6 PM HST Friday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters. && $$ DISCUSSION...Morrison AVIATION...TS MARINE...M Ballard Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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