Hawaii County climate forecast is July 24, 2021

Hilo

Today: Showers likely, mostly before noon. Partly sunny, with a high near 83. East-northeast winds around 8 mph. The probability of rainfall is 70%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Occasional showers. Low around 71. North wind around 10 km / h. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Sunday: Showers likely, mostly before noon. Mostly cloudy, with a peak near 81. North-northeast wind with a speed of about 11 km / h and in the afternoon to the east. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A few showers after noon. Mostly sunny, with a high near 82. West winds around 9 mph. The chance of rainfall is 30%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers before midnight. Partly cloudy, with a low of around 70. Calm wind. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

THE ARTICLE CONTINUES BELOW THE ADVERT

Sunday: A few showers after noon. Increasing clouds, with a high near 82. Light and changeable wind. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: a few showers. Partly sunny, with a high near 75. Windy, with an east-northeast wind around 23 mph, with gusts of up to 32 mph. The probability of precipitation is 50%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tonight: Showers likely. Mostly cloudy, with a minimum of about 63. East winds about 23 km / h, with gusts of up to 30 km / h. The probability of precipitation is 60%. New amounts of precipitation between a quarter and a half inch are possible.

Sunday: Showers likely, mostly before noon. Partly sunny, with a peak near 77. East-northeast winds 8 to 23 km / h, with gusts of up to 18 km / h. The probability of precipitation is 60%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Occasional showers. High near 69. Windy, with an east-northeast wind around 35 km / h, with gusts of up to 50 km / h. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Occasional showers. Low around 61. Windy, with easterly winds of 23 mph, gusts up to 32 mph. The probability of precipitation is 90%. New rainfall levels of less than a tenth of an inch possible.

Sunday: Occasional showers. High near 70. Windy, with an easterly wind of 16 to 35 km / h, with gusts of up to 50 km / h. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: Sunny, with a high near 86. Windy, with an east-northeast wind around 42 mph, with gusts up to 54 mph.

Tonight: A few showers after midnight. Partly cloudy, with a minimum of about 76. Breezes, with an east-northeast wind at about 25 mph, with gusts of up to 34 mph. The probability of precipitation is 20%.

Sunday: Mostly sunny, with a high near 85. Windy, with easterly winds of 18 to 20 mph, with gusts of up to 40 mph.

feedback

Today: Showers likely, mostly before noon. Mostly cloudy, with a height of almost 79. Northeasterly wind with about 23 km / h, with gusts of up to 18 km / h. The probability of precipitation is 70%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tonight: Occasional showers. Low at 69. North winds 11 to 13 miles an hour. The probability of precipitation is 80%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Sunday: Showers likely. Mostly cloudy, with a high near 78. North-northeast winds 8-10 mph. The probability of precipitation is 70%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Waikoloa

Today: Sunny, with a high near 85. Windy, with a northeast wind around 23 mph, with gusts up to 32 mph.

Tonight: Mostly clear, with a minimum of about 70. Windy, with an east-northeast wind of 18 to 23 mph, decreasing to 5 to 10 mph in the evening. Winds can blow up to 32 miles per hour.

Sunday: Sunny, with a peak near 85. East wind at 10 km / h will be calm in the afternoon.

summary

The stormy trade winds will ease slightly over the weekend and early next week. The showers will continue to affect trades, with rainfall and humidity rising from Sunday night to Tuesday.

discussion

The satellite shows an area of ​​low cloud over and immediately upstream of the Big Island this morning, with additional low cloud upstream of the smaller islands. High pressure in the north of the islands will maintain the trade winds and bundle clouds and showers over the windward and Mauka locations.
An overnight ASCAT pass continues to show breezy trade winds over the waters near the islands. As a result, the coastal winds have increased and some of the land winds have also been driven up. Several of the high resolution models continued to show these stronger winds. The Surace Trough about 650 miles southeast of the Big Island (the remains of the former tropical cyclone Guillermo) helps maintain a tighter pressure gradient across the islands. The current forecast will ease the winds a little tonight, with the high in the north likely to weaken. However, it is possible that the winds hardly change as the surface channel approaches the islands.
The surface trough will bring an additional amount of moisture to the islands, which will likely reach the Big Island on Sunday night and then spread to the smaller islands on Monday and Tuesday. While most of the shower activity is expected to remain over the windward sides, some of these showers could end up in leeward areas. An upper trough in the northwest of the islands is expected to sink south towards the islands early next week. This could lead to additional instability, which could lead to higher precipitation totals, and still cannot rule out a bit of thunder. However, the models do not match the instability well, so confidence remains low.
In the middle of the week, the forecast continues the more typical trade wind showers. However, a disturbance can occur south of the islands, which could further exacerbate the pressure gradient over the islands.

aviation

Moderate to airy east-northeast trades will continue today and create tempo-wise turbulence over the slipstream of the mountain ranges. See AIRMET section below. Expect isolated showers to mainly affect windward locations with short periods of time with MVFR caps and visibility. Otherwise partly cloudy with VFR conditions for lee areas.
AIRMET TANGO remains in effect due to tempo-wise turbulence below 8,000 feet above and immediately southwest of the mountains.
AIRMET SIERRA remains in effect for north-east sections of Maui and the Big Island above 2000 feet to darken the mountains with clouds and showers.

marine

The harsh sea conditions will last all weekend due to the strong easterly trade winds. The highest seas will hover just below the 10-foot advisory threshold in the more exposed windy areas and canals by early Sunday. A downtrend appears possible until early next week in response to a weakening ridge in the north. The wind could be easing enough to relax the Small Craft Advisory for all marine areas by Monday. A return from fresh to strong trade in the east is possible in the course of the next week, as the low pressure moves south and high pressure builds up in the north.
Surfing along the east-facing coast will remain at its highest due to heavy weekend trade around the islands. A downtrend is expected early next week as business slows down locally and upstream in the Eastern Pacific.
Surfing on the south-facing banks will be around the summer average today and then subside until Sunday, when a small south swell spreads. Not much is expected next week, apart from short to medium-term southeast trade winds on exposed banks. High pressure has parked above our swell window down around and east of New Zealand, which is expected to stop early next week. As a result, the small surf will continue into August.
Surf along exposed west and north coasts could rise slightly by the end of next week due to a possible small west-northwest swell due to tropical activity in the distant western Pacific (low confidence). Otherwise, summery conditions are expected every day.

HFO watches / warnings / notices

Small Craft Advisory until Sunday 6:00 p.m. HST for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.
Small boat advice until 6:00 p.m. HST tonight for Kauai Northwest Waters, Kauai Leeward Waters, Kauai Channel, Oahu Windward Waters, Oahu Leeward Waters, Kaiwi Channel, Maui County Windward Waters, Maui County Leeward Waters.

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Data courtesy of NOAA.gov

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