Hawaii County weather forecast for July 20, 2021

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Today: Showers likely. Mainly cloudy, with a high near 80. Wind north 5 to 10 mph becoming east to northeast in the afternoon. The probability of precipitation is 70%. Further precipitation amounts of less than a tenth of an inch are possible.

Tonight: Occasional showers. Low around 68. Wind northeast around 6 mph. The probability of precipitation is 80%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Wednesday: Occasional showers, mainly before 1:00 p.m. High near 81. Wind northeast around 8 mph. The probability of precipitation is 80%. Further precipitation amounts of less than a tenth of an inch are possible.

Kona

Today: Isolated showers in the afternoon. Increasing cloud, with a high near 80. Light and variable wind becoming west northwest 5 to 8 mph in the morning. The probability of precipitation is 20%.

Tonight: Scattered showers, mainly before midnight. Mainly cloudy, with a low around 68. Wind southerly around 6 mph becoming northwest in the evening. The probability of precipitation is 30%. Further precipitation amounts of less than a tenth of an inch are possible.

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Wednesday: Isolated showers in the afternoon. Increasing clouds, with a high near 81. Westerly wind around 5 mph becoming calm in the morning. The probability of precipitation is 20%.

Waimea

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Today: Scattered showers. Partly sunny, with a high near 75. Windy, with an easterly northeasterly wind of 18 to 20 mph, gusting up to 28 mph. The probability of precipitation is 50%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Tonight: Scattered showers. Rather cloudy, with a low of about 59. Windy, with an easterly wind of about 16 mph, gusting up to 22 mph. The probability of precipitation is 50%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Wednesday: Scattered showers. Partly sunny, with a high near 75. Wind east from northeast around 14 mph, with gusts of up to 18 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: Showers likely. Mainly cloudy, with a high near 68. Windy, with an easterly wind 23-28 mph, gusting up to 40 mph. The probability of precipitation is 60%. Further precipitation amounts of less than a tenth of an inch are possible.

Tonight: Showers likely. Mainly cloudy, with a low of around 58. Windy, with an easterly wind 17-23 mph, gusting up to 32 mph. The probability of precipitation is 70%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Wednesday: Showers likely. Mainly cloudy, with a high near 69. Windy, with an easterly northeasterly wind of 17-23 mph, gusting up to 32 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 before noon. Mostly sunny, with a high near 84. Windy, with an easterly wind 22-28 mph, gusting up to 36 mph. The probability of precipitation is 20%.

Tonight: Isolated showers. Partly cloudy, with a low of around 74. Windy, with an easterly northeasterly wind of 21 to 23 mph, gusting up to 29 mph. The probability of precipitation is 20%.

Wednesday: Isolated showers before noon. Mainly sunny, with a high near 85. Windy, with an easterly wind 20-24 mph, gusting up to 31 mph. The probability of precipitation is 20%.

Puna

Today: Showers likely. Rather cloudy, with a high near 77. Windy, with northeast wind 11 to 15 mph, gusting up to 21 mph. The probability of precipitation is 70%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Tonight: Occasional showers. Low around 66. Wind northeast 9 to 13 mph. The probability of precipitation is 80%. New amounts of precipitation can be anywhere from a tenth to a quarter of an inch.

Wednesday: Showers likely, mainly before noon. Mainly cloudy, with a high near 77. Wind northeast around 14 mph, with gusts of up to 18 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: Sunny, with a high near 83. Windy, with a northeast wind 8 to 15 mph, gusting up to 21 mph.

Tonight: Mainly clear with a low of around 68. Wind northeast around 9 mph.

Wednesday: Sunny, with a high near 83. Wind northeast 6 to 8 mph.

Synopsis

Windy and locally gusty trade winds will continue throughout the week, with showers mostly concentrated in the upwind and mauka areas, particularly overnight and early in the morning. More extensive showers are possible during the weekend.

Discussion

Windy and locally gusty trade winds will persist throughout the week, occasionally bringing clouds and downpours that will mostly dampen upwind areas. A few light showers spreading downwind will do little to help the barren landscape.
A strong high pressure area far north of the islands will change little today, then gradually drift west over the next few days. The locally strong trade winds will continue in the short term, then weaken slightly the next day or two. Confidence is high that most of the increased humidity from Felicia’s remains will pass south of the islands by the end of the week, but some peripheral humidity could increase commercial showers from Thursday to Friday. The resulting constricting pressure gradient may cause a slight increase in the speed of the trade winds. A larger low-level moisture slug associated with Guillermo’s remains could be found near the islands by the end of next weekend. An associated surface trough can result in weaker winds as it relaxes the local gradient.

Aviation

The locally windy trade winds will continue today due to the strong surface high pressure far north and northwest of the state. A large area of ​​low fragmented to locally overcast cloud with scattered encrusted showers is carried over eastern Big Island this morning. This will likely result in periods of MVFR conditions on the slopes and coastal sections of the Big Windward Island today. There are also low clouds and showers over most of the windward sections of the smaller islands. Expect brief spells of MVFR conditions over the northern to eastern sections of some of the smaller islands until mid-morning.
AIRMET Tango for moderate turbulence TEMPO over and south to west higher terrain over all islands is likely to remain in effect until tonight. AIRMET Sierra for mountain obscuration is in effect for the windward sides of most islands. This AIRMET may be jettisoned for some of the smaller islands later this morning, but may remain in effect for the Big Island until noon.

Marine

A strong high pressure ridge north of the Hawaiian Islands will continue to produce cool to strong trade winds and high choppy seas throughout the week. A small craft advisory (SCA) was extended in time to include all coastal waters until this afternoon, and for the windiest canals and waters of the eastern half of the state through Thursday. morning.
Surfing along the east-facing shores will remain high with choppy conditions until the weekend due to the heavy trade. Some areas of the southern and northern shores are expected to experience localized increases in surf due to the swell of the trade winds.
Tropical Cyclone Felicia, currently in the eastern Pacific, will drift west and weaken over the next two days. The remains of this system will pass south of the Hawaiian Islands this weekend. The trade winds will increase a bit as the remnants of Felicia pass south of the state, with a slight increase in the trade winds swells and surf heights expected for the east-exposed coasts.
No swells from the west or north are expected over the next seven days, so surf heights for the north and west exposed coasts will remain nearly flat.

HFO Watches / Warnings / Notices

Small Craft Advisory until 6:00 a.m. HST Thursday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Leeward Waters of Big Island, Southeast Waters of Big Island.
Small Craft Advisories until 6:00 p.m. HST tonight for Northwestern Kauai Waters, Windward Waters of Kauai, Leeward Waters of Kauai, Kauai Channel, Windward Waters of Oahu, Leeward Waters of Oahu, the Kaiwi Canal, Leeward Waters of Maui County, Leeward Waters of Maui County, Leeward Waters of Big Island.

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Data courtesy of NOAA.gov


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