Hawaii County Weather Forecast for July 10, 2022

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Photo credit: James Grenz

Hello

Today: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 78 to 83 near shore at 63 to 71 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

This evening: Cloudy with showers likely. Lows 64 to 71 near shore at about 56 to 4000 feet. Northwest winds up to 15 mph. Chance of rain 70 percent.

Monday: Cloudy with likely showers in the morning, then partly sunny with light showers in the afternoon. Highs 78 to 83 near shore at 63 to 71 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 60 percent.

Kona

Today: Sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 83 to 88 near shore to about 69 near 5000 feet. West winds up to 10 mph. Chance of rain 30 percent.

This evening: Mostly cloudy with isolated showers in the evening, then partly cloudy after midnight. Lows around 71 near shore to 52 to 57 near 5000 feet. Light winds. Chance of rain 20 percent.

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Monday: Rather sunny with isolated showers in the morning, then rather cloudy with scattered showers in the afternoon. Highs 82 to 87 near shore to about 68 near 5000 feet. Light winds. Chance of rain 40 percent.

Waimea

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Today: Windy. Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 66 to 86. East winds 15 to 30 mph. Chance of rain 30 percent.

This evening: Costs. Mostly cloudy with probable showers. Lows 63 to 69 near shore to 55 to 63 near 3000 feet. East winds 10-25 mph gusting to 45 mph. Chance of rain 70 percent.

Monday: Partly sunny with scattered showers. Highs 67 to 86. Winds east 10 to 15 mph. Chance of rain 50 percent.

Kohala

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Today: Windy. Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 66 to 86. East winds 15 to 30 mph. Chance of rain 30 percent.

This evening: Costs. Mostly cloudy with probable showers. Lows 63 to 69 near shore to 55 to 63 near 3000 feet. East winds 10-25 mph gusting to 45 mph. Chance of rain 70 percent.

Monday: Partly sunny with scattered showers. Highs 67 to 86. Winds east 10 to 15 mph. Chance of rain 50 percent.

big south island

Today: Quite sunny. Costs. Isolated showers in the afternoon. Highs around 85 near shore to around 68 near 5000 feet. East winds up to 25 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 20 percent.

This evening: Partly cloudy. Costs. Lows around 73 near shore to around 52 near 5000 feet. Northeast winds 10 to 20 mph.

Monday: Quite sunny. Costs. Isolated showers in the afternoon. Highs around 84 near shore to around 68 near 5000 feet. East winds 10 to 20 mph. Chance of rain 20 percent.

puna

Today: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 78 to 83 near shore at 63 to 71 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

This evening: Cloudy with showers likely. Lows 64 to 71 near shore at about 56 to 4000 feet. Northwest winds up to 15 mph. Chance of rain 70 percent.

Monday: Cloudy with likely showers in the morning, then partly sunny with light showers in the afternoon. Highs 78 to 83 near shore at 63 to 71 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 60 percent.

Waikoloa

Today: Sunny in the morning then becoming partly sunny. Windy. Highs from 82 to 90 near shore to 66 to 74 above 4000 feet. Northeast winds up to 30 mph increasing to 10 to 30 mph in the afternoon.

This evening: Windy. partly cloudy with isolated showers. Lows around 72 near shore to 49 to 57 above 4000 feet. Southeast winds up to 30 mph. Chance of rain 20 percent.

Monday: Mostly sunny with isolated showers in the morning, then partly sunny in the afternoon. Highs of 82 to 88 near shore to 65 to 74 above 4000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.

Synopsis

Windy to locally strong exchanges will concentrate clouds and showers over windward and mauka areas through Tuesday. The influx of residual moisture from a decaying tropical system will favor increased shower coverage on Wednesday and Thursday.

Discussion

Chose to issue a wind advisory for parts of the Big Island, Maui and Kahoolawe today and tonight. Bradshaw on the Big Island briefly touched on the advisory criteria yesterday. High resolution models still show a small uptick today and tonight. The ASCAT pass missed the islands overnight, so the decision was based on the model’s advice. It is expected to be a low-end, short-lived event.
As expected, there were showers concentrated on the windward sides of the islands overnight. Several upwind rain gauges on the Big Island received a third to a half inch of rain overnight. Satellite-derived precipitable water and satellite imagery suggest a drier, more stable air mass moving over the islands later in the day, so expect shower activity to be at down today.
Mid to upper level ridges will be airborne over the next two days, helping to keep the air mass stable over the islands. Combined with the arrival of a drier air mass, expect this relatively drier period to last well into the middle of the week. This may further suppress the inversion, which could lead to increased winds for the windiest locations typical of Maui County and the Big Island on Sunday. The overnight sounding at Hilo showed a higher inversion than yesterday afternoon, so time will tell what impact that will have on the Big Island winds today.
The remnants of former Tropical Cyclone Bonnie appear to be approaching the islands mid-week. Raised the QPF to the National Blend of Models for Wednesday and Thursday, but found existing PoPs still consistent with global patterns, with showers focusing on the Big Island and Maui County.
In the Eastern Pacific, Tropical Storm Darby is expected to track west over the next 5 days and enter the Central Pacific Basin at 140W Thursday evening. No local impacts from Darby would be anticipated until next weekend, and it is far too early to discern any of these impacts with certainty. See bulletins issued by the National Hurricane Center in Miami for the latest news on Darby.

Aviation

A high pressure system far north of the islands will continue to produce gusty trade winds throughout the region. Passing showers will continue to produce brief periods of MVFR conditions over windward aerodromes, elsewhere VFR conditions will prevail.
AIRMET Sierra in effect for mountain obscuration for sections N through E of Maui and the Big Island. Sierra will probably continue until the wee hours of the morning.
AIRMET Tango remains in effect for moderate low level turbulence over and to the lee of island mountain ranges. The tango will continue at least until tonight.

Marine

Large anchored surface high pressures far to the north of the islands will maintain a sufficiently steep pressure gradient across the state to continue to sustain cool to locally strong sustained trade winds. A Small Craft Advisory (SCA) remains in effect for the windiest bays and channels around Maui and the Big Island. An SCA is also in effect for coastal waters windward of Maui and leeward of Maui and Oahu until at least early Monday morning.
A small swell of short period from the southeast will cross the coastal waters from Monday until the end of the week. Along with the arrival of new southern swell precursors, this will increase the surf slightly along more easterly and southerly aspects on Monday. Several long period southerly swell impulses are expected to arrive during the week. These swells will generate near to above normal summer surf heights facing south. A slightly higher, longer period southerly swell will begin to arrive on Monday afternoon and top the waves on Tuesday and Wednesday. Long range guidance has a gale passing east of New Zealand early Tuesday which will provide a nice source or recovery region for an even higher southerly swell. This larger swell can produce High Surf Advisory level waves along southern exposures when it hits the islands next weekend. Watercraft will continue to push relatively small, short-duration wind waves to the east-facing shores. A small to medium period easterly swell from former hurricane Bonnie could arrive on Monday and Tuesday.

Watchdogs/Warnings/HFO Advisories

Wind advisory until 6 a.m. HST Monday for Kahoolawe, Maui Windward West, Kohala, Big Island Interior, Big Island North.
Small craft advisory until 6:00 p.m. HST Monday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Lee Waters, Big Island Southeast Waters.
Small craft advisory until 6:00 a.m. HST Monday for Leeward Waters of Oahu, Kaiwi Channel, Leeward Waters of Maui County, Leeward Waters of Maui County.

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Data reproduced with kind permission from NOAA.gov

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