Hawaii County climate forecast is July 31, 2021

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Photo credit: James Grenz

Hilo

Today: A few showers, especially before noon. Partly sunny, with a high near 83. Calm wind blowing 5 to 9 miles per hour from east-northeast in the morning. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers, mostly after 10 p.m. Mostly cloudy, with a low of about 71. North-westerly winds 3 to 5 mph. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Sunday: A few showers, mostly before noon. Partly sunny, with a high near 83. North winds 6 to 10 mph. The probability of rainfall is 50%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A few showers after noon. Partly sunny, with a high near 82. West winds 5 to 8 miles per hour will be calm in the afternoon. The probability of precipitation is 20%.

Tonight: Partly cloudy, with a low of about 71. East-southeast wind about 10 km / h.

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Sunday: A few showers after noon. Mostly sunny, with a peak near 82. Calm wind that blows in the afternoon at a speed of 10 km / h from the south-southeast. The probability of precipitation is 20%.

Waimea

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Today: single showers. Mostly sunny, with a high near 77. Windy, with east-northeast winds of 20 to 45 mph, with gusts of up to 45 mph. The probability of precipitation is 20%.

Tonight: A few showers. Partly cloudy, with a minimum value of around 58. Windy, with a northeasterly wind of around 45 km / h, with gusts of up to 41 km / h. The probability of precipitation is 20%.

Sunday: single showers. Mostly sunny, with a peak near 77. Very windy, with a northeast wind of 29 to 50 km / h, with gusts of up to 45 km / h. The probability of precipitation is 20%.

Kohala

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Today: A few showers, especially before noon. Partly sunny, with a high near 70. Windy, with east-northeast winds of 25 to 45 mph, with gusts of up to 55 mph. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers, mostly after 10 p.m. Mostly cloudy, with a minimum value of about 52. Windy, with an east-northeast wind of about 45 km / h, with gusts of up to 41 km / h. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Sunday: A few showers, mostly before noon. Mostly sunny, with a high near 70. Very windy, with east-northeast winds of 30 to 52 mph, with gusts of up to 47 mph. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: Mostly sunny, with a peak near 82. Windy, with east winds 28 to 48 km / h, with gusts of up to 60 km / h.

Tonight: Partly cloudy, with a low of around 75. Windy, with an easterly wind of around 45 km / h, with gusts of up to 60 km / h.

Sunday: Mostly sunny, with a peak near 82. Very windy, with an easterly wind around 50 km / h, with gusts of up to 40 km / h.

feedback

Today: A few showers, especially before noon. Partly sunny, with a peak near 81. Breeze, with a northeast wind of 8 to 24 km / h, with gusts of up to 34 km / h. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy with a minimum of about 70. North-northwest winds 9 to 21 mph. The probability of precipitation is 50%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Sunday: A few showers, mostly before noon. Partly sunny, peaking near 81st breezes, with north winds of 13 to 25 mph, with gusts of up to 35 mph. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Waikoloa

Today: Mostly sunny, with a high near 85. Windy, with an east-northeast wind of 17 to 42 mph, with gusts of up to 38 mph.

Tonight: Mostly clear, with a low of about 70. Windy, with an easterly wind of 14 to 20 miles per hour, with gusts of up to 45 miles per hour.

Sunday: Sunny, with a peak near 85. Very windy, with an east-northeast wind of 20 to 40 km / h, which increases to 26 to 50 km / h in the afternoon. Gusts of wind could reach up to 45 miles per hour.

summary

A strong high pressure system forming far northeast of the Hawaiian Islands will generate strong trade winds over the weekend. The trade wind speeds will drop to a more moderate level from late Monday. A strong high pressure ridge over the islands will limit rain activity over the region until Monday. A passing low point will increase the trend in rainfall from Tuesday to Thursday, which favors windward and mountainous areas.

discussion

Satellite and radar images show fairly stable clouds with sporadic to sporadic showers that drift into windward and mountainous areas in the eastern trade winds. Infrared satellite imagery shows wildfire in the Kohala area creating smoke over parts of Kohala and Kona counties.
A strong high pressure system far in the northeast of the region will generate strong trade winds this weekend. Increasing trade winds on Saturday and Sunday will approach and potentially exceed wind recommendations for wind-favored areas of the Big Island and Maui Counties. A low trade wind inversion height can help direct these stronger winds over these wind-favored areas and wind advice may be required for Sunday. The high pressure system north of the islands will weaken from late Monday, causing trade wind speeds to return to more normal levels for this time of the year.
A stable high pressure ridge at altitude will keep trade wind inversion heights in the 5,000-7,000-foot range this weekend and will limit showers to isolated to scattered coverage mainly over windward and mountainous areas at night until the wee hours of the morning. That pattern may change somewhat on Tuesday when a low point in the easterly winds drifts through the islands. The temperature inversion heights of the trade winds rise to the altitude range of 8,000 to 10,000 feet, which enables scattered to numerous showers along windward and mountain slopes, with isolated showers being possible over empty areas

aviation

The Stratus that developed last night has either dissolved or has moved to lower Stratoku coverage. AIRMET Sierra for mountain darkening was therefore canceled for all locations, but isolated cases of MVFR remain possible. Windy trades today, aided by the stronger inversion, will continue to gain strength and become strong in some locations. The showers will be light and mostly confined to windward locations. AIRMET Tango for leeward turbulence below 8 kft remains in effect for the entire period.

marine

Fresh to locally strong trade winds will increase well into Sunday as the high pressure increases north of the state. A Small Craft Advisory (SCA) was expanded to cover all Hawaiian waters, and a gale watch was issued on Sunday for the typically windy waters around the Big Island and Maui. The SCA will likely be required for most, if not all, of Monday’s waters and for the normally windy waters around the Big Island and Maui for most of the next week.
A belt of trade winds across the region creates seas in 7 to 8 seconds with a seasonal average of 6 feet. The harsh east coast surf will notch with the trade winds tonight and Sunday, then drop back to the seasonal average early next week.
The surf on the south coast will remain rather low for this time of year, with a small pulse of south swell occurring today and on Sunday. Nearly flat conditions will persist on the north coasts this week, while tiny swell energy from the west will be possible for the next few days.

Fire weather

Dry minimal humidity and stable weather are combined with strong and gusty trade winds this weekend. The stormy trade winds on Saturday will be stronger on Sunday. Weather conditions are expected to approach critical fire thresholds this weekend in some windy lee areas mainly in the late morning to afternoon hours through Sunday.

HFO watches / warnings / notices

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

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Data courtesy of NOAA.gov

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