| Current Conditions | ||
| Temp |  | 7.5 C |
| RH | | 47 % |
| Wind | | NNE 5 mph |
| Road | | Open (4x4) |
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Hawaiian Islands Synoptic Discussion and Guidance 777 FXHW60 PHFO 071935 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 935 AM HST Sun Aug 7 2022 .SYNOPSIS... Trade winds over the southern end of the state, will expand westward across the remaining islands today. Showers over the western islands this morning will slowly diminish by this evening, while a drier airmass across the remainder of the islands generates fair trade wind weather today. A return of windward and mauka showers is expected Monday as trades gradually strengthen, with locally strong trades possible by the middle of this week. && .DISCUSSION... Current radar trends continue to show scattered showers lifting up across Kauai and surrounding waters, while a band of slightly heavier showers lingers south of the island. Expect these showers to continue over the western end of the state through this afternoon as a weak surface trough exits west, while moisture streams across the region in advance of an upper low to the northwest. Some weak instability lingers just west of Kauai into the afternoon which could enhance rainfall rates some today, however the most unstable air (Showalter, mid level lapse rates) will remain well north of the area, reducing the chance for thunderstorms. The latest trends show the deeper layer moisture and showers will diminish over Kauai late this afternoon and early evening, as the upper low slowly exits to the northwest. Otherwise, a much drier airmass will continue to stream in from the east across the remainder of the islands, generating fair trade wind weather through tonight. The trade winds which have already developed over the southern islands, will slowly continue to expand across the remainder of the islands by this evening, as the ridge of high pressure becomes further established north of the state. This will result in a hybrid sea breeze/trade wind pattern today, before trades settle in statewide on Monday. More typical trade wind showers, or slightly drier than normal weather, is expected during the first half of the week. Locally strong trades are possible by mid-week as an area of low pressure potentially develops and passes far south of the state. && .AVIATION... Moderate trades will return to all islands today as high pressure builds to the north of the state. A weak area of enhanced low level moisture and instability will be moving west of Oahu and Kauai through this afternoon and bring a slight uptick in afternoon shower activity to these islands. Otherwise, trades will allow for a return of more typical scattered windward/ isolated leeward showers tonight. AIRMET Tango remains in effect for portions of Maui and Molokai due to low-level mechanical turbulence leeward of mountains. && .MARINE... Easterly trade winds will gradually strengthen from east to west tonight and Monday. A surface trough northwest of Kauai will slowly weaken and drift northward during this time, allowing high pressure to the distant north to exert a greater influence. As a result, fresh to locally strong easterly trade winds that are already in place around the Big Island and Maui County will spread across the entire area. A Small Craft Advisory (SCA) is in effect for the typically windy waters around Maui County and the Big Island through early Tuesday morning, and the SCA will need to be extended, likely for several days. In addition, a further increase in winds is expected late Tuesday or Wednesday as a tropical disturbance passes far south of the islands. This may require and expansion of the SCA to additional waters. Little significant swell is anticipated through next week. A small short-period northeast swell will diminish on Monday. Building trade winds will produce a gradual increase in short- period waves to east facing shores during the next couple of days, peaking near or slightly above season average on Wednesday. A very small, long-period south swell may arrive Tuesday and fade by Thursday. A small, shorter-period south- southeast swell is expected over the next couple of days, with a larger pulse from the same direction possible next weekend. && .HFO WATCHES/WARNINGS/ADVISORIES... Small Craft Advisory until 6 AM HST Tuesday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters. && $$ DISCUSSION...SWR AVIATION...Thomas MARINE...Wroe Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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