Hawaii County Weather Forecast for August 23, 2022

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Photo credit: James Grenz

Hello

Today: Rather cloudy. Many showers in the morning, then scattered showers in the afternoon. Highs of 81 to 87 near shore at about 71 to 4000 feet. Southeast winds up to 10 mph. Chance of rain 70 percent.

This evening: Rather cloudy with many showers. Lows 66 to 73 near shore at about 55 to 4000 feet. Light winds. Chance of rain 70 percent.

Wednesday: Partly sunny with scattered showers. Highs of 81 to 87 near shore at about 71 to 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Kona

Today: Sunny in the morning, then mostly cloudy with heavy showers in the afternoon. Highs 82 to 87 near shore to 68 to 73 near 5000 feet. Northwest winds up to 10 mph. Chance of rain 60 percent.

This evening: partly cloudy with isolated showers. Lows 70 to 75 near shore to about 56 near 5000 feet. Light winds. Chance of rain 20 percent.

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Wednesday: Sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 82 to 87 near shore to 68 to 73 near 5000 feet. Light winds. Chance of rain 50 percent.

Waimea

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Today: Mostly cloudy with scattered showers. Highs 68 to 83. East winds up to 10 mph. Chance of rain 50 percent.

This evening: Mostly cloudy with scattered showers. Lows around 68 near shore to 56 to 64 near 3000 feet. Winds becoming light east until 10 mph after midnight. Chance of rain 50 percent.

Wednesday: Partly sunny with scattered showers. Highs 68 to 83. East winds up to 15 mph. Chance of rain 50 percent.

Kohala

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Today: Mostly cloudy with scattered showers. Highs 68 to 83. East winds up to 10 mph. Chance of rain 50 percent.

This evening: Mostly cloudy with scattered showers. Lows around 68 near shore to 56 to 64 near 3000 feet. Winds becoming light east until 10 mph after midnight. Chance of rain 50 percent.

Wednesday: Partly sunny with scattered showers. Highs 68 to 83. East winds up to 15 mph. Chance of rain 50 percent.

big south island

Today: Costs. Sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs around 86 near shore to around 75 near 5000 feet. East winds 10 to 20 mph diminishing to 20 mph in the afternoon. Chance of rain 50 percent.

This evening: Partly cloudy. Lows around 71 near shore to around 55 near 5000 feet. Northeast winds up to 15 mph.

Wednesday: Fairly sunny in the morning then becoming mostly cloudy. Costs. Scattered showers. Highs around 86 near shore to around 75 near 5000 feet. Northeast winds up to 20 mph shifting east 10-20 mph in the afternoon. Chance of rain 50 percent.

puna

Today: Rather cloudy. Many showers in the morning, then scattered showers in the afternoon. Highs of 81 to 87 near shore at about 71 to 4000 feet. Southeast winds up to 10 mph. Chance of rain 70 percent.

This evening: Rather cloudy with many showers. Lows 66 to 73 near shore at about 55 to 4000 feet. Light winds. Chance of rain 70 percent.

Wednesday: Partly sunny with scattered showers. Highs of 81 to 87 near shore at about 71 to 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Waikoloa

Today: Sunny with isolated showers in the morning, then mostly cloudy with scattered showers in the afternoon. Highs from 83 to 88 near shore to 69 to 76 above 4000 feet. Northerly winds up to 10 mph shifting to the northwest in the afternoon. Chance of rain 50 percent.

This evening: partly cloudy with isolated showers. Lows around 74 near shore to 51 to 60 above 4000 feet. Light winds. Chance of rain 20 percent.

Wednesday: Sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs from 83 to 88 near shore to 69 to 76 above 4000 feet. Northwest winds up to 10 mph. Chance of rain 50 percent.

Synopsis

A weak high pressure ridge north of the islands will keep lighter trade winds in the forecast through Thursday. Afternoon sea breezes will develop over the sheltered terrain of the western slopes of each island. A low-level trough crossing the state will increase precipitation coverage through Wednesday. Typical drier summer trade wind weather will begin from Thursday as the low level trough departs from the westerly pattern and the ridge returns to the region on Friday.

Discussion

Extensive clouds are spreading over the Hawaiian Islands, as seen in this morning’s GOES satellite imagery. Local radar continues to show scattered showers in many showers developing across the state. These clouds and showers are due to a low-level trough passing westward across the Hawaiian Islands. Upper air balloon soundings as of 2:00 a.m. HST this morning show inversion heights hovering between 8,000 and 9,000 feet. This higher than normal inversion height will favor the development of deeper clouds and the spread of heavy showers through Wednesday, favoring overnight into the early morning hours.
The subtropical ridge north of the islands remains in a weakened state due to a long wave trough passing slowly through the central North Pacific basin. The trade winds will remain lighter until Thursday due to this weaker high pressure ridge. Local sea breezes will develop daily over the sheltered terrain of the western sections of each island. Clouds and passing showers will tend to favor windward areas and mountains, with some of the heaviest showers moving through downwind areas. However, in this less stable hybrid wind pattern, expect the convergence of trade winds and sea breezes to produce downwind shower activity in the afternoon.
On Friday we return to a more dominant trade wind weather pattern as the long wave trough weakens north of the islands and the subtropical ridge rebuilds over the region. These moderate to windy trades will last at least through the first half of next week. Brief passing showers will generally favor windy and mountainous areas from night to early morning.

Aviation

The weak trade wind flow will continue to carry bands of light showers off the Pacific towards the slopes and the coasts mainly exposed to the north and east. A weak surface trough drifting east to west across the islands will further boost shower activity.
AIRMET Sierra is currently in effect for the north and east facing slopes of Maui, Molokai and Oahu, as well as the large windward island north of Volcano. Conditions should improve after sunrise. Elsewhere, VFR conditions will prevail, except for isolated MVFR conditions in passing showers.
For Leeward Big Island, light sea breezes will return in the afternoon. A generally clear sky in the morning will be replaced by VFR cloudiness in the late afternoon and will persist throughout the evening.

Marine

No significant change in the sea and surf forecast with the morning package. A ridge to the north and a weak low-level trough near the islands will maintain light to locally moderate trading through Friday. As the low level element moves west and dissipates, the surface ridge will lift north and strengthen allowing winds to increase over the weekend. Winds are expected to remain below the small craft advisory throughout the week.
The current long period swell from the south will continue to gradually decrease through Wednesday. A much weaker southern swell is expected from Thursday to Sunday. The current mid-northwesterly small swell is expected to peak today then gradually decrease Wednesday through Friday. Short-period choppy waves along the east-facing coasts will remain rather weak through Friday, with a slight rise expected over the weekend as the trade winds gradually strengthen.

Watchdogs/Warnings/HFO Advisories

None.

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Data reproduced with kind permission from NOAA.gov

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