| Current Conditions | ||
| Temp |  | 5.4 C |
| RH | | 20 % |
| Wind | | NE 14 mph |
| Road | | Open (4x4) |
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Hawaiian Islands Synoptic Discussion and Guidance 545 FXHW60 PHFO 210209 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 409 PM HST Wed Jun 20 2018 .SYNOPSIS... Trade winds will increase tonight as high pressure builds far northwest of the state. Volcanic haze lingering over the smaller islands will clear by morning. Trade winds will become breezy Friday and continue into next week. Showers will affect mainly windward and mountain areas with an increase in rainfall possible early next week. && .DISCUSSION... A surface ridge that has been persistently positioned just north of the islands will slowly retreat tonight as high pressure builds from the northwest. Trade winds will gradually increase with moderate to breezy trade winds expected Thursday. The volcanic haze the reached the smaller islands today will clear to the southwest as trade winds increase. Showers will focus over windward and mountain areas with an occasional shower reaching leeward locations. Trade winds will increase another notch Friday and remain breezy through the weekend as a 1035 mb high pressure system takes firm control of the weather pattern in the central Pacific. Aloft, global models are indicating a weak upper low will drift close to Hawaii from the east and weaken our trade wind inversion. This would allow for increasing cloud tops and the potential for an increase in showers Sunday and into next week. && .AVIATION... Mainly dry weather will continue across the state through tonight, with VFR conditions prevailing. Isolated MVFR ceilings are possible on windward slopes in light showers. Areas of MVFR visibilities are possible across parts of the Big Island due to volcanic emissions from Kilauea. Trade winds will begin to increase tonight, becoming breezy tomorrow. This could lead to a slight increase in windward/mauka clouds and showers. No AIRMETs are currently in effect or anticipated through tonight. && .MARINE... Fresh to strong trades are forecast to return starting late tonight as high pressure strengthens far northeast of the area. A Small Craft Advisory will likely be needed on Thursday afternoon for winds reaching 25 knots in the windy areas around the Big Island and Maui. Surf will remain small with no significant swells anticipated into the upcoming weekend. Surf will gradually build along east facing shores as trade winds return later tonight and increase Friday through the upcoming weekend. Overlapping long-period south swells are expected next week with the first swell expected to arrive around Tuesday. More details on surf heights will be given as the swell reaches the buoy near American Samoa. && .HFO WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Morrison AVIATION...TS MARINE...Kino/Foster Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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