| Current Conditions | ||
| Temp |  | 7.1 C |
| RH | | 11 % |
| Wind | | ENE 0 mph |
| Road | | Open (4x4) |
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Hawaiian Islands Synoptic Discussion and Guidance 313 FXHW60 PHFO 260158 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 358 PM HST Mon May 25 2020 .SYNOPSIS... Lighter winds and mostly dry weather are expected through Tuesday, with a few showers possible, mainly during the afternoon and evenings. Moderate trade winds are expected to return as early as Tuesday afternoon, and remain in place into next weekend, delivering scattered showers to windward and mauka areas. && .DISCUSSION... Afternoon soundings from Lihue and Hilo show a strong inversion at 7000 feet, which has helped limit the shower activity this afternoon. For tonight and Tuesday, we should see a similar weather pattern to the past few days with land breezes developing overnight, and sea breezes developing during the afternoon for select leeward areas. One weather aspect that will be different will be the increase in high clouds starting Tuesday afternoon. An upper level low southwest of the state will bring a stream of high clouds late Tuesday through Thursday. There are still some uncertainty on how thick the clouds will be, but at this time we are expecting the clouds to be relatively thin. As a high begins to build north of the state on Tuesday, we should see moderate trade winds return as early as Tuesday afternoon. Starting Wednesday, we should be back to a more typical trade wind pattern across the state. Trade winds are expected to hold at moderate speeds (10 to 20 mph) through most of the week with scattered showers over windward and mauka areas. Due to a stable atmosphere aloft, any showers should be on the lighter side and shower activity will likely favor early morning and overnight hours. && .AVIATION... Sea breezes along leeward locations will persist through late this afternoon with weak east southeast background flow. Isolated to scattered showers, mainly over the higher terrain, will diminish after sundown. Then, by tonight, isolated light showers are forecast to develop along the windward coasts and slopes. Brief MVFR conditions may occur due to this activity, but not expecting anything widespread. No AIRMETs are in effect at this time. && .MARINE... A surface ridge stalling about 200 nm north of Kauai will maintain moderate to fresh easterly trade winds around the Big Island and Maui and gentle to moderate east-southeast winds from Molokai to Kauai into Tuesday. A front passing north of the ridge will dissipate later Tuesday and Wednesday, allowing stronger high pressure to build far north of the state. As a result, trades will surge back over the islands late Tuesday then strengthen on Wednesday. Winds may reach Small Craft Advisory strength across the typically windy waters around the Big Island and Maui Wednesday into the weekend. Surf will remain below advisory levels on all shores this week. The current mix of south-southwest and south-southeast swells will decline Tuesday and Wednesday. A pulse of south-southwest swell will push surf to around May average late Thursday through Saturday, then decline. The current northwest swell will lower through tomorrow and will be reinforced by another small northwest swell on Wednesday. This swell will shift out of the north by Friday, with surf just below May average holding through the weekend. Surf along east facing shores will decline Tuesday and remain below May average through the week. && .HFO WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Kino AVIATION...Thomas MARINE...Wroe Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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