Hawaii County climate forecast is August 13, 2021

Hilo

Today: Partly sunny with a few showers. Heights from 78 to 84 near shore to 65 to 72 at 4000 feet. In the afternoon, the north wind blows at up to 24 km / h to the northeast. 50 percent chance of rain.

Tonight: Mostly cloudy with a few showers. Lows of 63 to 72 near the shore at 54 to 59 at 4000 feet. Northeasterly winds of 10 to 15 miles per hour. 50 percent chance of rain.

Saturday: Partly sunny with a few showers in the morning, then mostly sunny with a few showers in the afternoon. Heights from 77 to 84 near shore to 65 to 73 at 4000 feet. Northeasterly winds of 10 to 15 miles per hour. Chance of rain 40 percent.

Kona

Today: Sunny in the morning, then partly sunny in the afternoon with a few showers. Highs from 85 near shore to about 69 near 5000 feet. Southwest winds up to 10 km / h. Chance of rain 30 percent.

Tonight: Partly cloudy. Lows of 69 to 75 near shore to 50 to 56 near 5000 feet. Breeze.

THE ARTICLE CONTINUES BELOW THE ADVERT

Saturday: Mostly sunny. A few showers in the afternoon. Heights from 83 to 88 near shore to about 69 near 5000 feet. Breeze. Chance of rain 20 percent.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: airy. Partly sunny with a few showers. Highs 66 to 85. East winds 10 to 25 miles per hour. Chance of rain 40 percent.

Tonight: airy. In the evening mostly cloudy with a few showers, after midnight partly cloudy with a few showers. Lows of 63 to 71 near shore to 56 to 63 near 3000 feet. East winds 10 to 20 miles per hour. Chance of rain 40 percent.

Saturday: windy. Mostly sunny with a few showers. Highs 65 to 84. East winds 10 to 20 miles per hour. Chance of rain 20 percent.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: airy. Partly sunny with a few showers. Highs 66 to 85. East winds 10 to 25 miles per hour. Chance of rain 40 percent.

Tonight: airy. In the evening mostly cloudy with a few showers, after midnight partly cloudy with a few showers. Lows of 63 to 71 near shore to 56 to 63 near 3000 feet. East winds 10 to 20 miles per hour. Chance of rain 40 percent.

Saturday: windy. Mostly sunny with a few showers. Highs 65 to 84. East winds 10 to 20 miles per hour. Chance of rain 20 percent.

Southern big island

Today: airy. Sunny mornings, partly sunny afternoons with a few showers. Altitudes around 84 near shore to 67 near 5000 feet. East wind up to 20 km / h. Chance of rain 20 percent.

Tonight: Partly cloudy in the evening, then clear. Airy. Lows of 72 near shore to about 53 near 5000 feet. East winds 10 to 20 miles per hour.

Saturday: Mostly sunny. A few showers in the afternoon. Highs from 84 near shore to about 68 near 5000 feet. East winds 10 to 15 miles per hour. Chance of rain 20 percent.

feedback

Today: Partly sunny with a few showers. Heights from 78 to 84 near shore to 65 to 72 at 4000 feet. In the afternoon, the north wind blows at up to 24 km / h to the northeast. 50 percent chance of rain.

Tonight: Mostly cloudy with a few showers. Lows of 63 to 72 near the shore at 54 to 59 at 4000 feet. Northeasterly winds of 10 to 15 miles per hour. 50 percent chance of rain.

Saturday: Partly sunny with a few showers in the morning, then mostly sunny with a few showers in the afternoon. Heights from 77 to 84 near shore to 65 to 73 at 4000 feet. Northeasterly winds of 10 to 15 miles per hour. Chance of rain 40 percent.

Waikoloa

Today: Mostly sunny. Airy. A few showers in the afternoon. Heights from 83 to 89 near shore to 66 to 73 over 4000 feet. Northeast winds up to 25 miles per hour. Chance of rain 20 percent.

Tonight: Mostly clear. Airy. Lows of 73 near shore to 50 to 56 over 4000 feet. Northeast winds up to 20 miles per hour.

Saturday: sunny. Heights from 83 to 90 near shore to 67 to 74 over 4000 feet. Northeast winds up to 15 miles per hour.

summary

A 1026 mb surface elevation far to the north-northeast of the islands will continue to generate trade winds over the weekend as it slowly shifts west. A surface trough will approach the islands from the northeast over the weekend and bring a few days of light wind over land between Monday and Tuesday. But from today until Sunday night you can expect trade wind showers that adorn the windward and mountainous areas. The frequency of these showers will be highest at night and in the morning. Expect plenty of sunshine over the south and lee coasts every afternoon.

discussion

We are looking for a rather calm section with locally strong, typical trade winds until Sunday. The air mass is stable, which supports some mostly light trade showers, especially at night and in the morning. Current satellites and radar show scattered showers approaching the islands from the northeast, most commonly east of Kauai. So expect some wet roads during the morning commute over the windward and mountain areas. Much of these clouds and showers will dissipate by morning, resulting in plenty of sunshine, especially on the southern and leeward coasts.
A slowdown in trade is expected to begin Saturday night as the surface trough approaches the islands. On Monday the voyages will have given way to a light east wind, including winds from the southeast. The inner and southern sections will encounter an onshore current that will combine with daytime heating, resulting in some mottled afternoon clouds and showers. One night an offshore land breeze takes over, moving most of these clouds and showers into the adjacent waters and coast. Meanwhile, the easterly background current carries a few showers into the windward sections.
The surface trough is accompanied by an upper level trough. Models further suggest that the dynamics with the upper trough remain north of the islands, meaning that the air mass over the islands is stable enough to hold off heavy or widespread showers.
The trade winds are expected to return Tuesday night and get locally strong by Wednesday afternoon or evening.

aviation

For the remainder of the morning and into the afternoon, a moderate to occasionally light trade regime will apply. Therefore, most of the shower activity will occur along the windward coasts and slopes. There may be short periods of MVFR caps and visibility related to this activity. Otherwise, mainly dry weather with VFR conditions along the leeward areas is to be expected.
SIGMET SIERRA remains in effect for north-east areas of the Big Island above 2500 feet due to low clouds and showers.

marine

Fresh to strong northeast trades will last through Saturday and then fall into the easy category on Sunday through the first half of next week with an east-southeast background flow. The strong trades expected through Saturday will take place in typical areas between Maui County and the Big Island. The lighter winds returning from Sunday to the next week will result in land and sea breezes on the coasts every day.
Surf remains high along exposed north and west coasts while small, west-northwest pulses pervade the distant northwest Pacific in response to repetitive tropical springs. The little west-northwest swell that hit on Wednesday will steadily sink through to the weekend. An upward trend is expected tonight through Saturday as a slightly larger west-northwest swell arrives and builds up along the island chain. This will continue until the beginning of next week before it goes back to the summer average in the middle / end of the week.
After a long stretch of limited surf along the south-facing coast due to a blocking high that had built up in Hawaii’s swell windows around New Zealand, the locks have opened and a range of storm to gale force systems are moving through and east of New Zealand. This has resulted in an active phase locally with a range of south-south-west to south-west swells expected. With the swell, which peaked at the beginning of the week, tapering off by tonight, expect the surf to continue through the weekend while a small, long-lasting southwest swell arrives and runs through it. The largest in line is expected to arrive on or through Monday, with the high point centered around Tuesday and Wednesday. The swell could be bigger than expected at its peak, which could push the surf heights along the south-facing coasts up to / above our new recommendation threshold of 3 m on the wall (satellite data on Tuesday showed that the seas over the fetch predicted east of New became Zealand – about 45 feet). Let’s see what happens down at the pago pago buoy today through saturday as it moves.
Surfing along the east-facing coastlines will remain small each day until early next week, and then may trend upward in the second half when a small easterly swell from Hurricane Linda arrives (low confidence at this point – best chance at the east end of the State).

HFO watches / warnings / notices

Small Craft Advisory until Saturday 6pm HST for 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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