| Current Conditions | ||
| Temp |  | 6.4 C |
| RH | | 20 % |
| Wind | | NE 18 mph |
| Road | | Open (4x4) |
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Hawaiian Islands Synoptic Discussion and Guidance 957 FXHW60 PHFO 261949 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 949 AM HST Sun May 26 2019 .SYNOPSIS... Light trade winds can be expected today with just a few passing showers favoring windward and mauka areas. Winds will become lighter over the next couple of days as a front lingers northwest of the area. High pressure will build back in beginning Wednesday with a gradual uptick in trade winds expected through the remainder of the week. Clouds and passing showers will favor windward and mauka areas with just a few light showers expected over select leeward locations. && .DISCUSSION... High pressure is centered far northeast of the area while a stalled frontal boundary lies a couple of hundred miles northwest of Kauai. This places the islands in a light easterly trade wind environment. Moisture embedded in the trades is providing for some light passing showers over windward and mauka areas while most leeward locations are dry. Expect this trend to continue through the day today with local sea breezes setting up in some sheltered locations. The high will shift slightly eastward Monday and Tuesday. This will cause the winds to become a bit lighter and favor and east to slightly south of east direction. Daytime sea breezes and nighttime land breezes will become more prevalent under these conditions. Passing light showers will continue to favor windward and mauka areas with some interior showers a possibility during the afternoon hours due to day time heating and sea breeze convergence. By Wednesday, the high to the northeast will build back in a bit toward the area as the old frontal boundary northwest of Kauai weakens and drifts further away from the area. This will allow for a gradual uptick in trade winds beginning Wednesday with speeds reaching moderate to locally breezy levels as we head into next weekend. Clouds and passing showers will favor windward and mauka areas with leeward areas remaining essentially dry. && .AVIATION... High pressure to the northeast will drive moderate trade winds through tonight before winds shift east southeast on Monday. Clouds and showers moving in with the trade winds will focus over windward slopes. VFR conditions will prevail, but brief mountain obscurations may occur over the windward slopes. No AIRMETs are in effect at this time. && .MARINE... Winds are on the decline as the high far to the northeast slowly weakens. Expect lighter winds into Wednesday. A ridge building north of the islands during the second half of the week should allow winds to rebound into the breezy to strong range. The incoming south swell appears to be leveling off, with the resultant surf just below advisory levels. Will continue to monitor reports as this swell is expected to peak today and Monday, before lowering Tuesday. A new long-period, although slightly smaller, south swell is expected to arrive Tuesday and hold into the middle of the week. Additional small south swells are expected during the second half of the week. A small northwest swell associated with a gale that crossed the date line a few days ago is expected to begin to slowly ease Monday through Tuesday. Another north-northwest swell is possible Thursday. Surf along east facing shores will remain somewhat elevated through today due to the recent breezy to strong trades upwind from the islands. Expect a downward trend by Memorial Day as the trades marginally weaken. && .HFO WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Burke AVIATION...Foster MARINE...Kinel Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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