Hawaii County weather forecast for July 17, 2021

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Today: Occasional showers. High near 82. Wind east from northeast 6 to 9 mph. The probability of precipitation is 80%. Further precipitation amounts of less than a tenth of an inch are possible.

Tonight: Occasional showers. Low around 69. Wind northeast around 7 mph. The probability of precipitation is 80%. Further precipitation amounts of less than a tenth of an inch are possible.

Sunday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 81. Wind east from northeast 9 to 11 mph. The probability of precipitation is 70%. Further precipitation amounts of less than a tenth of an inch are possible.

Kona

Today: Scattered showers in the afternoon. Increasing clouds, with a maximum near 82. Light and variable wind. The probability of precipitation is 50%. Further precipitation amounts of less than a tenth of an inch are possible.

Tonight: Scattered showers, mainly before midnight. Mostly cloudy, with a low around 68. Wind calm. The probability of precipitation is 40%. Further precipitation amounts of less than a tenth of an inch are possible.

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Sunday: Isolated showers in the afternoon. Mainly sunny, with a high near 82. Wind calm becoming westerly at about 6 mph. The probability of precipitation is 20%.

Waimea

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Today: Showers likely, mainly before noon. Partly sunny, with a high near 76. Windy, with an easterly northeasterly wind of 13 to 15 mph, gusting up to 21 mph. The probability of precipitation is 60%. Further amounts of precipitation are possible between a quarter and a half inch.

Tonight: Showers likely, mainly before midnight. Mainly cloudy, with a low of about 59. Windy, with an easterly wind of about 15 mph, gusting up to 21 mph. The probability of precipitation is 70%. Further amounts of precipitation are possible between a quarter and a half inch.

Sunday: Scattered showers. Partly sunny, with a high near 76. Windy, with an east-northeast wind of around 16 mph, gusting up to 22 mph. The probability of precipitation is 40%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Kohala

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Today: Occasional showers. High near 69. Windy, with an easterly wind of about 21 mph, gusting up to 29 mph. The probability of precipitation is 80%. Further precipitation amounts of less than a tenth of an inch are possible.

Tonight: Occasional showers. Low around 58. Windy, with an easterly wind of 16-21 mph, gusting up to 29 mph. The probability of precipitation is 80%. Further precipitation amounts of less than a tenth of an inch are possible.

Sunday: Showers likely. Rather cloudy, with a high near 69. Windy, with an easterly wind 17-20 mph, gusting up to 28 mph. The probability of precipitation is 70%. Further precipitation amounts of less than a tenth of an inch are possible.

Big South Island

Today: Isolated showers. Partly sunny, with a high near 86. Windy, with an easterly wind 20-22 mph, gusting up to 28 mph. The probability of precipitation is 20%.

Tonight: Scattered showers, mainly between 7 p.m. and 1 a.m. Mainly cloudy, with a low of about 74. Windy, with an easterly northeasterly wind of about 22 mph, gusting up to 28 mph. The probability of precipitation is 40%. Further precipitation amounts of less than a tenth of an inch are possible.

Sunday: Isolated showers before 1 p.m. Mainly sunny, with a high near 85. Windy, with an easterly wind of 22 to 25 mph, gusting up to 32 mph. The probability of precipitation is 20%.

Puna

Today: Occasional showers. High near 78. Windy, with northeast wind 11 to 15 mph, gusting up to 21 mph. The probability of precipitation is 80%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Tonight: Occasional showers. Low around 66. Windy, with northeast wind 13-15 mph, gusting up to 21 mph. The probability of precipitation is 80%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Sunday: Showers likely, mainly before noon. Mainly cloudy, with a high near 77. Windy, with a northeast wind 15-17 mph, gusting up to 24 mph. The probability of precipitation is 70%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Waikoloa

Today: Isolated showers in the afternoon. Sunny, with a high near 84. Wind northeast around 7 mph. The probability of precipitation is 20%.

Tonight: Scattered showers before midnight. Mainly cloudy then becoming gradually clear, with a low around 68. Wind east 6 to 8 mph. The probability of precipitation is 40%. Further precipitation amounts of less than a tenth of an inch are possible.

Sunday: Sunny, with a high near 84. Wind northeast around 9 mph.

Synopsis

High pressures north of the islands will support windy trade winds throughout the weekend. Stronger exchanges could develop early next week. Low cloud will move over the islands from the east, occasionally dropping showers over windward areas, with increased showers expected to move later overnight and last until Saturday evening.

Discussion

High pressures northeast and north of the islands will maintain trade winds in local waters for the foreseeable future. A high pressure in the northeast will dissipate this weekend as a new high will form in our north. The central pressure of this new maximum could peak at close to 1036 mb early next week, accentuating the pressure gradient enough to locally cause windy conditions on Monday and Tuesday. Otherwise, the windy trade winds will prevail.
The satellite loop shows a large field of stable low cloud between Hawaii and the mainland, with open-cell shower cumulus clouds immediately upstream of the islands. These clouds will move today through Saturday evening as a weak mid-level trough replaces the current ridge. The subsidence reversal near 7,000 feet will weaken and increase, causing showers to increase mainly in upwind areas. Otherwise, expect patches of broken low cloud to provide a few windy showers, with precipitation favoring nights and mornings. The downwind areas will remain mostly dry, with only brief and light precipitation expected.

Aviation

The easterly windy trade winds will continue throughout the weekend, with clouds and showers concentrating on the upwind and mauka locations. MVFR CIGS / VIS are possible in and around passing showers. AIRMET Tango for low level turbulence will remain in effect throughout the weekend.

Marine

The surface high pressure area far north of the area will maintain locally strong trade winds and rough seas across the state until this weekend. As a result, a Small Craft Advisory (SCA) remains in effect for the generally windier waters adjacent to the islands of County Maui and the Big Island this weekend. Due to further strengthening of the trade winds early next week, it is likely that the SCA will need to be expanded to include more Hawaiian waters from Monday.
Observations from buoys in the southern part of the state suggest that the current southerly swell, which has a period of approximately 16 seconds, will continue to form today. This will likely result in an increase in surf heights to near or just above summer average along the south-facing coasts from this afternoon through Monday. This southerly swell will gradually abate early next week, so expect the surf to return to below normal heights along the south-facing shores by the middle of the week. The gusty trade winds will produce near-summer average and choppy waves along the east-facing coasts this weekend. The stronger trade, which is expected early next week, is expected to produce high and choppy waves along the east-trending coasts from Monday. In addition to a localized wave of trade winds, the surf along most of the north-facing coasts is likely to remain mostly flat until early next week.

HFO Watches / Warnings / Notices

Small Craft Advisory until 6 p.m. HST Sunday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Leeward Waters of Big Island, Southeast Waters of Big Island.

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Data courtesy of NOAA.gov

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