| Current Conditions | ||
| Temp |  | 2.6 C |
| RH | | 85 % |
| Wind | | NNE 30 mph |
| Road | | Open (4x4) |
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Hawaiian Islands Synoptic Discussion and Guidance 839 FXHW60 PHFO 051317 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 317 AM HST Wed Aug 5 2020 .SYNOPSIS... High pressure north of the state will keep moderate to breezy trades in place through early next week, with the trades peaking over the weekend. Showers will favor windward and mauka areas through the period, with a stray shower occasionally spilling leeward. A disturbance moving through aloft is expected to increase shower coverage and intensity Wednesday night through early Friday. && .DISCUSSION... Currently at the surface, a 1030 mb high centered around 1050 miles north of Honolulu, is driving moderate to locally breezy trade winds across the island chain early this morning. Infrared satellite imagery shows partly to mostly cloudy skies across the state, with cloud coverage the greatest in windward areas. Radar imagery shows scattered showers moving into windward slopes and coasts, with a stray shower or two drifting leeward from time to time. Main short term focus revolves around rain chances during the next few days. High pressure will remain nearly stationary to the north of the islands for the next few days, keeping moderate to breezy trade winds in place. The high will strengthen to around 1035 mb this weekend, and with inversion heights lowering to around 6 kft, the trade wind speeds should increase to breezy levels statewide. The high will weaken slightly and move to a position well north of the islands early next week, and this should lead to a slight easing of the trades, although moderate to locally breezy conditions will likely continue. As for weather details, fairly typical conditions will persist through early next week, with showers favoring windward and mauka areas and the occasional leeward spillover. There is an increase in deep layer moisture associated with a mid-level disturbance that will spread from east to west across the islands tonight through Thursday night however, and this should bring an increase in shower coverage and intensity as it moves through. The moisture depth will climb to around 15 kft during this period, and this will likely send more showers into leeward areas as well. Given the persistent trades keeping showers moving along, no flooding issues are expected, but some higher rainfall totals can be expected. && .AVIATION... A high pressure ridge north of the islands will keep moderate to breezy trade winds in the forecast for the next several days. Low level turbulence will continue over and south through west of island mountain ranges. A disturbance moving in from the east will bring enhanced showers to the Hawaiian Islands starting tonight and continuing through Thursday. Brief periods of MVFR conditions are expected in showers mainly over windward and mountain areas of each island. AIRMET TANGO remains in effect for tempo moderate turbulence below 8000 feet for areas over and immediately south through west of mountains. && .MARINE... A high north of the area will remain nearly stationary and slowly strengthen through the weekend. A Small Craft Advisory (SCA) continues for the waters around Maui County and the Big Island through Saturday due to strong easterly trade winds. However, the SCA may need to be expanded over the weekend as trades intensify. A small, and fairly short-period, southeast swell will persist into next week but the Big Island will block some of this swell from reaching the rest of the islands. Long-period swells from deep in the southern hemisphere will remain small. Small surf along east facing shores will build through the weekend as trade winds strengthen. && .HFO WATCHES/WARNINGS/ADVISORIES... Small Craft Advisory until 6 PM HST Saturday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters. && $$ DISCUSSION...Jelsema AVIATION...Bohlin MARINE...Kinel Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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