Hawaii County climate forecast is April 8, 2021

Hilo

Today: Showers likely, mostly before 1pm. Partly sunny with a high of nearly 77. West winds 5 to 9 miles per hour blowing north-northeast in the afternoon. The risk of precipitation is 70%. New rainfall levels of less than a tenth of an inch are possible.

Tonight: Showers likely, mostly after 1am. Mostly cloudy with a low of around 61. North-northeast winds 5 to 8 miles per hour that become light and changeable after midnight. The risk of precipitation is 70%. New rainfall levels of less than a tenth of an inch are possible.

Friday: Showers likely, mostly before 1pm. Partly sunny, with a high of nearly 77. Light and changing winds blowing northeast 5 to 8 miles per hour in the afternoon. The risk of precipitation is 70%. New rainfall levels of less than a tenth of an inch are possible.

Kona

Today: a few showers after 1 p.m. Mostly sunny, with a high of nearly 79. Calm wind blowing west-southwest in the afternoon 5 to 7 miles per hour. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch are possible.

Tonight: a few showers, mostly before 1am. Partly cloudy with a low of 59. Southeasterly winds 3 to 8 miles per hour. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch are possible.

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Friday: isolated showers before 7 a.m., then isolated showers after 1 p.m. Mostly sunny, with a high of nearly 79. Light and changing winds blowing south 5 to 7 miles per hour in the morning. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch are possible.

Waimea

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Today: a few showers. Mostly sunny, with a high of nearly 74. Breezy, with a northeast wind at 18 mph, with gusts of up to 25 mph. The risk of precipitation is 40%. New levels of rainfall between a tenth and a quarter of an inch are possible.

Tonight: a few showers. Partly cloudy with a low of around 50. Airy, with northeasterly winds of 14 to 17 mph, with gusts of up to 24 mph. The risk of precipitation is 40%. New levels of rainfall between a tenth and a quarter of an inch are possible.

Friday: a few showers. Mostly sunny, with a high of nearly 74. Breezy, with northeasterly winds of 9 to 16 mph, with gusts of up to 22 mph. The risk of precipitation is 40%. New levels of rainfall between a tenth and a quarter of an inch are possible.

Kohala

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Today: Showers likely, mostly before noon. Partly sunny, with a high of nearly 70. Windy, with east-northeast winds of 21 to 26 mph, dropping to 15 to 20 mph in the afternoon. Winds could gust up to 38 miles per hour. The risk of precipitation is 70%. New rainfall levels of less than a tenth of an inch are possible.

Tonight: Showers likely, mostly after midnight. Partly cloudy, with a low of 43. Breezy, with east-northeast winds of 15 to 22 mph, with gusts of up to 31 mph. The risk of precipitation is 70%. New rainfall levels of less than a tenth of an inch are possible.

Friday: Showers likely, mostly before noon. Partly sunny, with a high of nearly 70. Breezy, with east-northeast winds of 16 to 21 mph, dropping to 8 to 13 mph in the afternoon. Winds could gust up to 29 miles per hour. The risk of precipitation is 60%. New rainfall levels of less than a tenth of an inch are possible.

South Big Island

Today: a few showers after noon. Sunny, with an altitude of almost 79. Windy, with an easterly wind of 23-25 ​​mph, with gusts of up to 33 mph. The probability of precipitation is 20%.

Tonight: isolated showers. Mostly clear, with a low of 67. Windy, with an easterly wind of 21 to 24 mph, with gusts of up to 31 mph. The probability of precipitation is 20%.

Friday: isolated showers. Sunny, with an altitude of almost 79. Windy, with an easterly wind of 18 to 25 mph, with gusts of up to 33 mph. The probability of precipitation is 20%.

Feedback

Today: Showers likely, mostly before noon. Partly sunny with a high near 76. North-northeast winds 8 to 13 miles per hour. The risk of precipitation is 70%. New levels of rainfall between a tenth and a quarter of an inch are possible.

Tonight: Showers likely, mostly after midnight. Mostly cloudy with a minimum of 59. Northwest winds 7 to 13 miles per hour. The risk of precipitation is 70%. New levels of rainfall between a tenth and a quarter of an inch are possible.

Friday: Showers likely, mostly before noon. Partly sunny with a high of nearly 76. Northwest winds 8-11 miles per hour blowing northeast in the afternoon. The risk of precipitation is 60%. New levels of rainfall between a tenth and a quarter of an inch are possible.

Waikoloa

Today: a few showers after noon. Sunny, with an altitude of nearly 80. Windy, with an east-northeast wind of 22-25 mph, with gusts of up to 36 mph. The probability of precipitation is 20%.

Tonight: isolated showers before midnight. Mostly clear, with a low of 59. Breezy, with an easterly wind of 16-22 mph, with gusts of up to 31 mph. The probability of precipitation is 20%.

Friday: a few showers after noon. Sunny, with a high of nearly 80. Breezy, with northeasterly winds of 16 to 21 mph, dropping to 6 to 11 mph in the afternoon. Winds could gust up to 29 miles per hour. The probability of precipitation is 20%.

Summary

The high pressure north of the area maintains cool and locally breezy trade in the northeast through Friday, with passing showers favoring wind and mauka areas. Business will decrease over the course of the weekend, so land and sea breezes can develop in the protected areas. The showers tend to favor windsides and coastlines at night and in the morning, and some showers develop over the interior and leeward areas every afternoon. Trades will pick up early next week with the more typical trade wind weather returning and windy conditions developing by the middle of the week.

discussion

Currently, at the surface, an elevation of 1036 MB is approximately 1550 miles north of Honolulu, while a depth of 1016 MB is approximately 925 miles northeast of Hilo. These features deliver cool and breezy trade winds northeast to the island chain early this morning. Infrared satellite images mostly show cloudy skies in windward areas with partly cloudy conditions in leeward areas. In the meantime, radar images are spread over numerous showers moving to windward areas, with some showers occasionally reaching leeward sections. The main short-term concern for the next few days will be trade wind trends.
Very little change in the weather pattern is expected for the remainder of the work week. High pressure north of the state and low pressure in the northeast will continue to deliver cool and locally airy businesses. Passing showers favor wind and mauka areas, especially at night and early in the morning, with a sprinkler shower or a few sprinkles that get into the leeward areas from time to time.
Over the weekend, an upper trough will dig to the southeast and across the islands, reinforcing the surface in the east of the state. This will loosen the trade winds to the light to locally moderate range, with localized land and sea breezes developing in some of the more protected areas. The showers prefer slopes and coasts facing the wind at night and in the early morning hours, as well as interior and leeward areas in the afternoon and evening. A slightly wetter pattern can develop on Sunday when the top trough goes over the head.
The upper trough will slide further east at the beginning of next week, pushing the above-ground trough further away from the chain of islands. This allows a new strong high-rise building northwest of the state to gradually become more dominant. As a result, we expect northeast trade to strengthen early next week, with trading becoming windy mid-week. Fairly typical trade wind weather is to be expected in the first half of the next week, although it can be a little wetter on Monday when the upper trough departs to the east. Otherwise, showers are expected to favor wind and mauka areas over time, with an occasional scatter shower spreading leeward.

aviation

The fresh to locally strong trade winds will last for 24 hours and possibly beyond. Low clouds and isolated showers continue to be directed north to east towards the slopes and coasts. Expect periods of MVFR CIG and VIS with passing showers, especially on the Big Island and Kauai. AIRMET Sierra is now in effect for the northeast slopes of the Big Island and is expected to remain necessary until late this morning.
AIRMET TANGO remains effective due to the airy trades for mechanical turbulence at low levels below 9,000 feet above and immediately south through west of the higher ground. This AIRMET will probably remain necessary at least into the evening hours.
Despite the strength of the trade winds, light ocean breezes and accumulations of cumulus are expected to develop on Lee Big Island this afternoon. However, an inversion of the cap by 09 kft will inhibit vertical development and limit shower activity.

marine

As a high becomes weaker far north of the islands in the next few days, the trade winds will subside. For the typically windier waters around Maui County and the Big Island, however, a Small Craft Advisory applies until Friday afternoon.
The current north-northeast swell will slowly decrease today and continue over the weekend. As a result, the surf remains on many banks facing north and east during the rest of the working week. A high surf advisory is valid for most east-facing coastlines until this afternoon, but may need to be extended until tonight or Friday as the surf slowly dips below the 8 foot threshold. This swell could also cause rise enough in north-facing ports, including Kahului and Hilo, to cause unsafe sea operations by this afternoon.
The surf on the south coast stays small during the working week, although surfing heights may increase this weekend until early next week. It appears that surf along the north and west coasts will also see a small to moderate surge early next week.

HFO watches / warnings / notices

High Surf Advisory until 6 p.m. HST that evening for the east facing coastlines of Kauai, Oahu, Molokai, Maui, and the Big Island.
Small Craft Advisory until 6:00 p.m. HST Friday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, and Big Island Southeast Waters.

Data courtesy of NOAA.gov

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