| Current Conditions | ||
| Temp |  | 10.9 C |
| RH | | 17 % |
| Wind | | NE 8 mph |
| Road | | Open (4x4) |
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Hawaiian Islands Synoptic Discussion and Guidance 597 FXHW60 PHFO 241946 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 946 AM HST Sun May 24 2020 .SYNOPSIS... Light winds out of the east to southeast direction will continue through Tuesday as a weak disturbance near Kauai continues westward and away from the islands. Winds should be light enough for afternoon sea breezes, allowing for showers to develop over interior and leeward areas. A return of a more typical trade wind pattern is expected by midweek as a ridge of high pressure strengthens north of the state. && .DISCUSSION... A weak surface trough just northwest of Kauai has weakened the pressure gradient, allowing for land breezes to develop overnight. Latest radar and satellite imagery is showing a few showers for select areas this morning. As we head into the afternoon today, we should see sea breezes develop. This will lead to scattered showers in the afternoon, with the showers favoring interior and leeward areas. With the weak flow aloft, any showers that do develop will be slow moving and could cause some heavy rain for select areas. Overnight tonight, we should see land breezes develop and shower coverage decrease. A few isolated showers will remain possible due to the weak surface trough lingering northwest of Kauai. For Monday and Tuesday, we are looking at the surface trough moving further away from the area. This should help stabilize the atmosphere just a little bit. For the most part, we should see a similar weather pattern to today, with land/sea breezes developing and afternoon showers focused over interior and leeward areas. Overnight, showers will decrease as land breezes develop. Starting Wednesday, high pressure building north of the state should bring the return of moderate easterly trade winds. With a stable atmosphere aloft, showers will mainly favor windward and mauka areas during the overnight and early morning hours. This stable trade wind pattern could continue through the end of next week. && .AVIATION... High pressure dominating far northeast of the islands will allow for mainly light easterly flow today. Thus, sea breeze will likely form this afternoon along the leeward coasts. With sufficient moisture in place, expect scattered showers to develop over the interiors of the islands and spread at random as the afternoon progresses. Brief MVFR conditions may be possible with the heavier shower activity, but not anticipation anything widespread. No AIRMETs are in effect at this time. && .MARINE... Moderate to fresh easterly trade winds will hold around the Big Island and Maui through Tuesday, while gentle to moderate east- southeast winds will prevail from Molokai to Kauai. The subtropical ridge currently sits about 350 nm north of Kauai and will continue to drift southward during the next couple of days. Meanwhile, a weak surface trough just northwest of Kauai is lifting away to the northwest and will slowly dissipate. The net effect will be little change in local winds during the next few days. Trade winds will rebuild around Wednesday as stronger high pressure passes north of the state. South facing shores will see periods of surf around the May average through much of the week. A longer period south-southwest swell will combine with a small south-southeast swell to produce moderate sized surf near or just below May average through Memorial Day, followed by a slight drop on Tuesday. Another pulse of south-southwest swell is due late Thursday through Saturday. A series of small northwest swells will produce surf near the May average along north facing shores through much of the week. The small swell will shift out of the north Friday and Saturday. Surf along east facing shores will be below May average through the week as trade winds over and upstream of the state remain weaker than normal. && .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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