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PHZ123 Big Island Leeward Waters- 341 Pm Hst Tue Oct 3 2023
Tonight..Northeast winds 15 knots. Wind waves to 3 feet. SWell southeast 3 feet. Isolated showers.
Wednesday..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves to 3 feet. Mixed swell northwest 3 feet and southeast 3 feet. Isolated showers.
Wednesday night..Winds variable less than 10 knots west of the big island...east 15 knots near south point. Wind waves to 3 feet. Mixed swell northwest 3 feet and southeast 3 feet. Isolated showers after midnight.
Thursday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves to 4 feet. Mixed swell northwest 3 feet and southeast 3 feet.
Thursday night..West of the big island, northwest winds 10 knots in the evening, becoming variable less than 10 knots. NEar south point, east winds 20 knots. Wind waves to 4 feet. Northwest swell 3 feet. Isolated showers.
Friday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves to 4 feet. Northwest swell 3 feet. Isolated showers in the morning.
Friday night..West of the big island, south winds 10 knots, veering to northwest after midnight. NEar south point, east winds 20 knots. Wind waves to 5 feet. Northwest swell 3 feet. Isolated showers.
Saturday..Winds variable less than 10 knots west of the big island...east 20 knots near south point. Wind waves around 5 feet. SWell 2 feet or less. Isolated showers.
Sunday..West of the big island, winds variable less than 10 knots, becoming southwest 10 knots in the evening, then becoming variable less than 10 knots after midnight. NEar south point, east winds 20 knots. Wind waves around 5 feet. SWell 2 feet or less. Isolated showers.

PHZ100 341 Pm Hst Tue Oct 3 2023
Synopsis for hawaiian coastal waters.. A cold front approaching from the northwest will keep light southeasterlies through early Thursday. The front will weaken into a trough and shift westward late Thursday through the weekend while a new high builds to the distant northwest.

FXHW60 PHFO 040607 AFDHFO

Area Forecast Discussion National Weather Service Honolulu HI 807 PM HST Tue Oct 3 2023

SYNOPSIS
A land and sea breeze pattern is expected through Thursday, with sea breezes allowing for the development of a few daytime heating driven showers each afternoon, while land breezes keep most showers offshore or very near the coast each night. Moderate trade winds and a more typical windward and mauka focused shower pattern should return Friday, with this pattern then holding through early next week.

DISCUSSION
Currently at the surface, a a cold front is located around 275 miles northwest of Kauai, while a 1031 mb high is now 2000 miles northeast of Honolulu. Light winds prevail, with land breezes present or developing statewide. Infrared satellite imagery shows partly to mostly cloudy conditions, with daytime heating cloud cover on the decrease. Radar imagery shows very little shower activity this evening, with only a few showers over the coastal waters as well as Maui County and the Big Island. Main short term focus revolves around rain chances during the next couple days and the returning trades during the second half of the week.

A land and sea breeze pattern is expected to prevail through early Thursday, as an approaching front keeps the gradient weak across the island chain. The front is forecast to stall out just northwest of Kauai Wednesday night, then weaken into a trough and shift westward through the remainder of the work week while ridging rebuilds to the northwest of the islands. This should allow the trade winds to slowly return from east to west across the state Thursday and Thursday night, with moderate trades then holding in place Friday through early next week.

As for the remaining weather details, land and sea breezes will be dominant through early Thursday, with showers developing over interior and mauka areas each afternoon, then holding mainly offshore or very near the coast each night. Although the trades will begin to return Thursday, the combination of daytime heating and localized sea breezes will likely allow for some leeward and/or interior shower development in the afternoon once again.
More typical trade wind weather featuring mainly windward and mauka showers should return Friday and prevail through early next week.

AVIATION
Light background flow will allow land breezes to predominate during the overnight hours and sea breezes in the afternoon and early evening. Clouds and light showers will favor island interiors and be most active in the afternoon and early evening.
VFR conditions will prevail all areas.

No AIRMETS are currently in effect or anticipated at this time.

MARINE
A cold front moving into the far northwest offshore waters this evening will hang up and linger over the waters north of the islands through Friday. This scenario has killed the once tight upstream northeast pressure gradient, creating light southeast or variable breezes across most of the coastal and offshore waters.
These light southeasterly to variable winds will continue into Friday until high pressure from the west expands in north of the state. This will re-establish moderate to locally fresh trade winds this weekend.

A moderate size northwest (310 degree), medium period swell has passed across the far northwest buoys this afternoon and will be building in across the island chain tonight. This latest swell will reinforce Monday's northwest swell and peak surf to well over head high (as high as double head high along better exposed Kauai and Oahu northwest coasts) Wednesday and Thursday. The swell will turn more north (340-350 degree) Wednesday night into Thursday as it peaks out. The swell will begin to subside Friday and fade out through the weekend. Surf along south-facing shores will generally remain hip to chest high through the week in response to a couple of small, medium period south southeast swells mixing into the longer period south southwest background. Very small chop will occur along eastern shores through late week under light and mainly variable breezes.

HFO WATCHES/WARNINGS/ADVISORIES
None.

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Kailua Kona
Click for Map
Tue -- 06:15 AM HST     Sunrise
Tue -- 06:46 AM HST     2.24 feet High Tide
Tue -- 10:38 AM HST     Moonset
Tue -- 02:29 PM HST     0.63 feet Low Tide
Tue -- 06:03 PM HST     0.89 feet High Tide
Tue -- 06:10 PM HST     Sunset
Tue -- 09:43 PM HST     Moonrise
Tue -- 11:41 PM HST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Kailua Kona, Big Island, Hawaii (2), Tide feet

Napoopoo
Click for Map
Tue -- 06:14 AM HST     Sunrise
Tue -- 06:56 AM HST     2.24 feet High Tide
Tue -- 10:37 AM HST     Moonset
Tue -- 02:39 PM HST     0.63 feet Low Tide
Tue -- 06:10 PM HST     Sunset
Tue -- 06:13 PM HST     0.89 feet High Tide
Tue -- 09:43 PM HST     Moonrise
Tue -- 11:51 PM HST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii, Tide feet

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