Weather Forecast

Hawaii County Weather Forecast for August 08, 2021

August 8, 2021, 7:16 AM HST
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Hilo

Today: Scattered showers, mainly before 1pm. Partly sunny, with a high near 84. West northwest wind 6 to 9 mph becoming north northeast in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers, mainly after 7pm. Mostly cloudy, with a low around 66. North wind around 6 mph becoming light and variable. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Monday: Scattered showers. Partly sunny, with a high near 84. Light and variable wind becoming northeast 5 to 10 mph in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Kona

Today: Isolated showers after noon. Partly sunny, with a high near 80. Southeast wind 5 to 8 mph becoming west southwest in the afternoon. Chance of precipitation is 20%.

Tonight: Isolated showers. Mostly cloudy, with a low around 65. West southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

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Monday: Scattered showers after noon. Partly sunny, with a high near 80. Calm wind becoming west 5 to 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Waimea

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Today: Isolated showers. Partly sunny, with a high near 79. Breezy, with a northeast wind 18 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.

Tonight: Scattered showers, mainly after 7pm. Mostly cloudy, with a low around 58. Breezy, with a northeast wind 14 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Monday: Scattered showers, mainly before 7am. Partly sunny, with a high near 79. Northeast wind around 14 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Kohala

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Today: Scattered showers, mainly before 1pm. Partly sunny, with a high near 65. Breezy, with an east wind 9 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

Tonight: Scattered showers, mainly after 7pm. Mostly cloudy, with a low around 53. East northeast wind 7 to 10 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Monday: Scattered showers. Mostly cloudy, with a high near 65. East southeast wind around 5 mph becoming calm. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

South Big Island

Today: Mostly sunny, with a high near 85. Windy, with an east wind around 23 mph, with gusts as high as 30 mph.

Tonight: Isolated showers after midnight. Partly cloudy, with a low around 74. Windy, with an east northeast wind 16 to 24 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.

Monday: Mostly sunny, with a high near 85. Breezy, with an east wind 14 to 22 mph, with gusts as high as 28 mph.

Puna

Today: Scattered showers. Partly sunny, with a high near 83. North northeast wind 11 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers. Mostly cloudy, with a low around 64. North northeast wind 7 to 13 mph becoming west northwest after midnight. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Monday: Scattered showers. Partly sunny, with a high near 83. West northwest wind 8 to 14 mph becoming northeast in the morning. Winds could gust as high as 18 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Waikoloa

Today: Mostly sunny, with a high near 85. Breezy, with an east northeast wind 13 to 21 mph, with gusts as high as 29 mph.

Tonight: Partly cloudy, with a low around 66. Breezy, with an east northeast wind 13 to 18 mph, with gusts as high as 25 mph.

Monday: Mostly sunny, with a high near 85. East wind 5 to 13 mph becoming northwest in the morning.

Detailed Forecast

Synopsis

Moderate to locally breezy trades will continue today, before easing slightly during the first half of the week as high pressure north of the state weakens. Rather dry weather will persist through Monday, with more humid conditions and increased rain chances expected Tuesday through Wednesday as the remnant moisture from former tropical cyclone Jimena moves through the islands. Drier more typical trade wind weather is expected to return Thursday and continue into next weekend, along with a slight increase in trade wind speeds.

Discussion

Currently at the surface, a 1029 mb high is centered around 1250 miles north of Honolulu, and is driving moderate trade winds across the island chain early this morning. Meanwhile, a trough of low pressure (the remnant of former tropical cyclone Jimena) is located around 675 miles east of the Big Island. Infrared satellite imagery shows clear to partly cloudy skies in most areas, with a few pockets of more substantial cloud cover in some windward locales. Radar imagery shows a few light showers moving into windward areas, with rain free conditions in most leeward locales. Main short term concerns revolve around trade wind trends and increasing rain chances as the old tropical remnants move through.
High pressure north-northeast of the islands will keep moderate to locally breezy trade winds in place today. The trades will ease slightly Monday through Wednesday as high pressure weakens far northeast of the state, but hold generally at moderate levels. We should then see a subtle increase in trade wind speeds Thursday into next weekend as high pressure becomes more dominant north of the island chain.
As for the remaining weather details, fairly dry conditions should continue to hold in place statewide through Monday, with showers limited to mainly windward and mauka areas during the night and early morning hours. The leading edge of some deeper moisture associated with former tropical cyclone Jimena should begin to filter into the region Monday night and Tuesday, bringing an increase in showers particularly to windward areas. This deeper moisture will slowly pass through the islands Tuesday night through Wednesday night, likely bringing showery weather to windward areas and some showers to leeward locales as well. We should see drier and more typical trade wind conditions return Thursday through next weekend, with showers favoring windward and mauka areas, mainly at night and during the early morning hours.
Some more humid weather will likely accompany the remnants of Jimena as they pass through the islands. Dewpoints are forecast to climb into the 70s beginning Tuesday and continuing through Thursday, making it feel rather uncomfortable from what we’ve been experiencing lately. Drier more comfortable weather should then return by Friday and continue into next weekend.

Aviation

A high pressure system far north of the Hawaiian Islands will keep brief passing showers over windward and mountain slopes of the smaller islands. The Big Island will see periods of passing showers with brief MVFR conditions later this afternoon that may require an AIRMET for Mountain Obscuration.
Trade wind speeds will slowly later tonight and tomorrow as the high pressure system far north of the islands slowly drifts away from the state. AIRMET Tango for Moderate Turbulence S thru W of all island mountains will continue at least into the morning hours.

Marine

High pressure north of the state will maintain generally moderate to fresh trade winds today. Recent satellite scatterometer passes depicted locally strong trades channeling through the typically windier areas surrounding Maui County and those waters south of the Big Island. A Small Craft Advisory (SCA) remains in effect for these areas through early Monday morning. The northeastern movement of high pressure far north of the region will weaken the pressure gradient across the state. This will ease trades back to more gentle and moderate speeds.
In response to weakening trades, surf along east facing shores will gradually fall the next few days. The next south swell is timed to arrive along the island’s southern shorelines late Monday with a Tuesday into Wednesday peak. This should translate to the return of higher, typical summertime level surf along south facing shores Tuesday and Wednesday. Nearly flat conditions continue along most north facing shores through Monday. Incoming west to northwest swells emanating from a series of compact lows passing across the Northwest Pacific will provide a boost to mid to late week north shore surf.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 AM HST Monday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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Data Courtesy of NOAA.gov

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