Weather Forecast

Hawaii County Weather Forecast for July 30, 2021

July 30, 2021, 7:16 AM HST
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Photo Credit: James Grenz

Hilo

Today: Frequent showers, mainly before noon. High near 83. West wind 8 to 11 mph becoming east northeast in the morning. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers, mainly after 11pm. Cloudy, with a low around 71. Northeast wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Scattered showers, mainly before 1pm. Mostly cloudy, with a high near 83. West wind 5 to 9 mph becoming east northeast in the morning. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Kona

Today: Isolated showers after 11am. Mostly cloudy, with a high near 81. Northeast wind 5 to 9 mph becoming southwest in the morning. Chance of precipitation is 20%.

Tonight: Mostly cloudy, with a low around 73. West wind around 5 mph becoming calm in the evening.

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Saturday: Isolated showers after noon. Partly sunny, with a high near 82. Calm wind becoming west southwest 5 to 9 mph. Chance of precipitation is 20%.

Waimea

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Today: Scattered showers, mainly before noon. Mostly cloudy, with a high near 76. Windy, with a northeast wind 18 to 24 mph, with gusts as high as 34 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Isolated showers. Mostly cloudy, with a low around 58. Windy, with a northeast wind 18 to 24 mph, with gusts as high as 34 mph. Chance of precipitation is 20%.

Saturday: Isolated showers. Mostly cloudy, with a high near 77. Windy, with a northeast wind 20 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 20%.

Kohala

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Today: Showers likely, mainly before 11am. Cloudy, with a high near 67. Windy, with an east wind 21 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers, mainly after 10pm. Cloudy, with a low around 52. Windy, with an east wind 25 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Scattered showers, mainly before noon. Cloudy, with a high near 70. Windy, with an east northeast wind 24 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

South Big Island

Today: Scattered showers before 11am. Mostly sunny, with a high near 83. Windy, with an east wind 25 to 28 mph, with gusts as high as 36 mph. Chance of precipitation is 30%.

Tonight: Partly cloudy, with a low around 75. Windy, with an east wind 24 to 28 mph, with gusts as high as 36 mph.

Saturday: Mostly sunny, with a high near 82. Windy, with an east wind 25 to 30 mph, with gusts as high as 39 mph.

Puna

Today: Frequent showers, mainly before 11am. High near 80. Breezy, with a northwest wind 10 to 16 mph becoming northeast in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers. Cloudy, with a low around 70. Northeast wind 7 to 11 mph becoming northwest in the evening. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Scattered showers, mainly before noon. Cloudy, with a high near 81. Breezy, with a northeast wind 7 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Waikoloa

Today: Mostly sunny, with a high near 85. Windy, with an east northeast wind 20 to 24 mph, with gusts as high as 34 mph.

Tonight: Mostly clear, with a low around 71. Windy, with an east wind 14 to 23 mph, with gusts as high as 32 mph.

Saturday: Mostly sunny, with a high near 85. Windy, with an east northeast wind 21 to 26 mph becoming light and variable in the afternoon. Winds could gust as high as 38 mph.

Detailed Forecast

Synopsis

Dry and breezy trade wind conditions are expected through the weekend and into early next week. The best chance for showers will be through the overnight and early morning periods over windward and mauka locations.

Discussion

Guidance remains in good agreement and depicts the subtropical ridge strengthening to the north over the weekend. This combined with rising upper heights and drier air moving in will support more of a suppressed and stable environment. Any showers that do development will favor windward and mauka areas, leaving little hope for reaching our parched leeward areas where drought conditions continue. The exception will be over the Kona slopes of the Big Island, where isolated afternoon showers are possible each day. Similar conditions will carry into next week.

Aviation

High pressure north of the islands will allow for moderate to breezy trades to persist trough the remainder of this morning and into the afternoon. Isolated to scattered showers will mainly affect windward coasts and slopes and bring brief periods of MVFR ceilings and visibility. Isolated showers elsewhere.
AIRMET TANGO remains in effect below 8000 ft over and immediately south thru west of mountains for tempo moderate turbulence.
AIRMET SIERRA has been issued for north thru east sections of the Big Island above 2000 feet due mountain obscuration from low clouds and showers.

Marine

High pressure far northeast of the state will slowly drift eastward and build into the weekend. Trade winds will gradually strengthen through the weekend. Widespread strong trades are expected over most Hawaiian waters by Sunday. The Small Craft Advisory (SCA) was expanded this morning to include most eastern Hawaiian waters and channels. This SCA will likely be expanded in coverage this weekend due to increasing trade winds.
Surf along east facing shores will remain small today, then trend up through the weekend in response to strengthening trades locally and upstream of the Hawaiian Islands.
Southerly swell activity will remain rather low for this time of the year with just background swells expected from the south and southeast. Nearly flat conditions will continue for north and west facing shores into early next week.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Sunday for Oahu Leeward Waters, Kaiwi Channel, Maui County Windward Waters, Maui County Leeward Waters, 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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