Hawaii County Climate Forecast is September 18, 2021

Hilo

Today: Partly sunny. Showers probably in the morning, then scattered showers in the afternoon. Heights from 84 near shore to 69 to 74 at 4000 feet. In the afternoon, the north wind blows at up to 24 km / h to the northeast. Chance of rain 70 percent.

Tonight: Mostly cloudy with showers likely. Lows of around 68 near the shore to around 54 at 4000 feet. North winds of up to 24 km / h turning northwest after midnight. Chance of rain 70 percent.

Sunday: Partly sunny. Showers probably in the morning, then scattered showers in the afternoon. Heights from 84 near shore to 69 to 74 at 4000 feet. In the afternoon, the north wind blows at a speed of up to 24 km / h on the east. Chance of rain 70 percent.

Kona

Today: Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Highs from 82 to 87 near shore to about 69 near 5000 feet. Breeze. Chance of rain 40 percent.

Tonight: In the evening mostly cloudy, then partly cloudy. Isolated showers. Lows of 69 to 74 near shore to about 55 near 5000 feet. Breeze. Chance of rain 20 percent.

THE ARTICLE CONTINUES BELOW THE ADVERT

Sunday: Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Highs from 82 to 87 near shore to about 69 near 5000 feet. West winds up to 10 km / h. Chance of rain 40 percent.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: airy. Partly sunny with a few showers. Heights from 82 near shore to 69 to 79 near 3000 feet. East winds 10 to 25 miles per hour. 50 percent chance of rain.

Tonight: airy. Mostly cloudy with a few showers. Lows around 68 near shore to 56 to 62 near 3000 feet. East winds from 10 to 25 mph, decreasing to as low as 25 mph after midnight. 50 percent chance of rain.

Sunday: windy. Partly sunny with a few showers. Heights from 82 near shore to 69 to 79 near 3000 feet. East winds up to 40 km / h, which increases to 10 to 25 km / h in the afternoon. 50 percent chance of rain.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: airy. Partly sunny with a few showers. Heights from 82 near shore to 69 to 79 near 3000 feet. East winds 10 to 25 miles per hour. 50 percent chance of rain.

Tonight: airy. Mostly cloudy with a few showers. Lows around 68 near shore to 56 to 62 near 3000 feet. East winds from 10 to 25 mph, decreasing to as low as 25 mph after midnight. 50 percent chance of rain.

Sunday: windy. Partly sunny with a few showers. Heights from 82 near shore to 69 to 79 near 3000 feet. East winds up to 40 km / h, which increases to 10 to 25 km / h in the afternoon. 50 percent chance of rain.

Southern big island

Today: airy. Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Highs from 86 near shore to 73 near 5000 feet. East winds up to 40 km / h, which increases to 10 to 25 km / h in the afternoon. Chance of rain 20 percent.

Tonight: Partly cloudy. Airy. Isolated showers in the evening. Lows of about 70 near shore to about 53 near 5000 feet. Northeasterly winds of 10 to 25 miles per hour. Chance of rain 20 percent.

Sunday: windy. Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Highs from 86 near shore to 73 near 5000 feet. East winds 10 to 25 miles per hour. Chance of rain 20 percent.

feedback

Today: Partly sunny. Showers probably in the morning, then scattered showers in the afternoon. Heights from 84 near shore to 69 to 74 at 4000 feet. In the afternoon, the north wind blows at up to 24 km / h to the northeast. Chance of rain 70 percent.

Tonight: Mostly cloudy with showers likely. Lows of around 68 near the shore to around 54 at 4000 feet. North winds of up to 24 km / h turning northwest after midnight. Chance of rain 70 percent.

Sunday: Partly sunny. Showers probably in the morning, then scattered showers in the afternoon. Heights from 84 near shore to 69 to 74 at 4000 feet. In the afternoon, the north wind blows at a speed of up to 24 km / h on the east. Chance of rain 70 percent.

Waikoloa

Today: Mostly sunny. Airy. A few showers in the afternoon. Heights from 86 near shore to 70 to 76 over 4000 feet. Northeast winds up to 25 miles per hour. Chance of rain 20 percent.

Tonight: Partly cloudy. Airy. Isolated showers in the evening. Lows of 72 near shore to 51 to 58 over 4000 feet. East winds up to 25 mph turning southeast up to 24 mph after midnight. Chance of rain 20 percent.

Sunday: Mostly sunny. A few showers in the afternoon. Heights from 86 near shore to 70 to 76 over 4000 feet. In the afternoon the northeast wind blows north at up to 16 km / h. Gusts up to 35 km / h. Chance of rain 20 percent.

summary

The breezy trades will continue throughout the weekend, with some relaxation expected on Sunday evenings and Monday. The trades will then climb back up to airy levels on Tuesday and Wednesday before falling a notch at the end of next week. Fairly typical trade wind weather will prevail during the forecast period. Rain showers will favor windward and mauka areas, especially at night and early in the morning, with occasional showers spilling over into the leeward communities from time to time.

discussion

Currently on the surface, an elevation of 1,028 mb centered about 1,125 miles north of Honolulu, moderate to breezy trade winds are blowing across the island chain this morning. Infrared satellite imagery shows a mix of high and low clouds resulting in partially to mostly cloudy conditions across the state. Radar images show scattered light showers moving into windward areas, with some showers spilling over into leeward communities from time to time. The top short-term concerns revolve around trade wind trends and the likelihood of rain for the next few days.
The high pressure in the far north will shift to the east this weekend and keep the rather breezy trade winds across the island chain in place. Trades should be in the moderate range from Sunday night to Monday night as a front runs far north of the state. A low pressure valley will then slide by south of the islands on Tuesday and Wednesday, which should bring the trades back to an airy level. A slight easing in trade is possible late next week as a new front approaches from the northwest.
As for the remaining weather details, the latest model solutions suggest that an area of ​​disturbed weather far to the southeast of the islands could send an area of ​​increased humidity towards the Big Island from Monday night to Tuesday night. In this case, the probability of rain must be increased and thunderstorms must also be included in the forecast. However, since this is just a new trend, the forecast is kept in line with previous model runs and forecast packages, which suggest that this deep moisture is passing south of the island chain. As a result, we expected a fairly typical trade wind weather pattern throughout the forecast period. Rain showers will favor windward and mauka areas, especially at night and early in the morning, with some showers occasionally reaching leeward areas due to the strength of the trades.

aviation

Windy to strong trade winds will continue to generate low levels of turbulence across the state for much of the weekend in the direction of the island’s winds. In return, AIRMET Tango remains in force. MVFR CIGS / VSBYS are possible in and around passing showers that concentrate on windward coasts and slopes. Otherwise, VFR conditions will prevail with limited showers expected over the void areas.

marine

High pressure in the north of the state will maintain fresh to locally strong trade winds this weekend. Last night’s ASCAT satellite pass over the eastern third of the state continued to check winds at an advisory level over the Alenuihaha Channel and off the Big Island’s South Point. Moving the high east over the next few days will change the central Pacific pressure gradient very little. This leads to a slight deviation from these fresh to locally strong winds. Today’s Small Craft Advisory (SCA) has been reconfigured to include all waters except the windward waters of Kauai, Oahu, and the Big Island. Tonight’s SCA through early Sunday drops off western Kauai waters and the Kauai Canal, while Sunday’s SCA cuts off the area further east to only the normally windy zones around Maui County and the waters south of the Big Island to cover.
The medium-term background of southwest to south swells will keep the surf along the south-facing coasts a little below the normal summer average until early next week. Small, sustained south swell energy from recent southern hemisphere storms southeast of New Zealand is expected to arrive mid-week. These swells can bring surfing back close to the summer average in the second half of the week. A small, medium-term northwest swell is expected to reach the Northwest Islands later today and travel through the chain on Sunday. These swells will lift the north and west coast surf from almost flat to possibly chest high on Sunday. A series of slightly larger, medium-term northwest swells, emanating from some easterly passing North Pacific storm lows, will hit the islands next week. A few days of fresh trading over and upstream of the region will support harsh wind waves along most of the eastern exposures through the middle of next week.

Fire weather

Gusty winds combined with dry fuels and low relative humidity increase the risk of fire this afternoon. Fires that develop spread quickly and are difficult to control. As a result, the lee sections of Kauai, Oahu, Molokai, Maui, Lanai, and the Big Island will have a red flag warning until 6:00 p.m. tonight.

HFO watches / warnings / notices

Red flag warning until 6:00 p.m. HST tonight for Kauai Leeward, Oahu South Shore, Waianae Coast, Oahu North Shore, Central Oahu, Waianae Mountains, Molokai Leeward, Lanai Makai, Lanai Mauka, Maui Leeward West, Maui Central Valley, Leeward Haleakala, Haleakala Summit, Kona, South Big Island, Kohala, Big Island Interior.
Small Craft Advisory until 6:00 p.m. HST on Sunday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.
Small Craft Advisory until 6:00 p.m. HST tonight for Kauai Northwest Waters, Kauai Leeward Waters, Kauai Channel.
Small boat advice through 6:00 am HST Sunday for 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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