Hawaii County climate forecast is September 17, 2021

Hilo

Today: Partly sunny with a few showers. Altitudes around 84 near shore to 70 to 75 at 4000 feet. Northeast winds up to 15 miles per hour. 50 percent chance of rain.

Tonight: Mostly cloudy. Isolated showers in the evening, then showers probably after midnight. Lows of around 68 near the shore to around 54 at 4000 feet. North winds up to 15 miles per hour. Chance of rain 70 percent.

Saturday: 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. Wind from the northeast up to 24 km / h, which increases to 10 to 24 km / h in the afternoon. Chance of rain 70 percent.

Kona

Today: Partly sunny. A few showers in the afternoon. Heights from 83 to 88 near shore to about 70 near 5000 feet. Breeze. Chance of rain 20 percent.

Tonight: In the evening mostly cloudy, then partly cloudy. Isolated showers. Lows of 69 to 75 near shore to about 55 near 5000 feet. Breeze. Chance of rain 20 percent.

THE ARTICLE CONTINUES BELOW THE ADVERT

Saturday: 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. Southwest winds up to 10 km / h. Chance of rain 40 percent.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Partly sunny. Airy. Isolated showers in the morning, then isolated showers in the afternoon. Altitudes around 82 near shore to 70 to 80 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 10 to 25 miles per hour. 50 percent chance of rain.

Saturday: windy. 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.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Partly sunny. Airy. Isolated showers in the morning, then isolated showers in the afternoon. Altitudes around 82 near shore to 70 to 80 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 10 to 25 miles per hour. 50 percent chance of rain.

Saturday: windy. 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.

Southern big island

Today: Partly sunny. Airy. A few showers in the afternoon. Altitudes around 87 near shore to 74 near 5000 feet. East wind up to 25 km / h. 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. Northeast winds up to 20 miles per hour. Chance of rain 20 percent.

Saturday: 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 wind up to 25 km / h. Chance of rain 20 percent.

feedback

Today: Partly sunny with a few showers. Altitudes around 84 near shore to 70 to 75 at 4000 feet. Northeast winds up to 15 miles per hour. 50 percent chance of rain.

Tonight: Mostly cloudy. Isolated showers in the evening, then showers probably after midnight. Lows of around 68 near the shore to around 54 at 4000 feet. North winds up to 15 miles per hour. Chance of rain 70 percent.

Saturday: 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. Wind from the northeast up to 24 km / h, which increases to 10 to 24 km / h in the afternoon. Chance of rain 70 percent.

Waikoloa

Today: Partly sunny. Airy. A few showers in the afternoon. Altitudes from 87 near shore to 71 to 77 over 4000 feet. Northeast winds up to 25 miles per hour. Chance of rain 20 percent.

Tonight: airy. In the evening mostly cloudy with a few showers, then partly cloudy after midnight. Lows 70 to 75 near shore to 51 to 58 above 4000 feet. East wind up to 25 km / h. Chance of rain 20 percent.

Saturday: 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.

summary

Drier than normal trade wind weather and airy conditions are expected today, with periods of high cloud cover still flowing over us. The breezy trades will resume tonight and Saturday as the trade showers increase and the high clouds decrease. From Sunday until the end of next week, moderate to airy trades will prevail, along with fairly typical windward and mauka-favored showers and the occasional spill over downwind.

discussion

Currently on the surface, an altitude of 1028 mb centered about 950 miles north of Honolulu, moderate to breezy trade winds are driving 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 of these showers spilling over into leeward communities. 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 in the next few days and keep the rather breezy trade winds across the island chain. Trades should plunge into moderate ranges on Sunday and Monday as a front passes well north of the state, and could rise again to breezy levels on Tuesday and Wednesday if a low pressure valley slips by south of the islands. A new front approaching from the northwest could then bring trades back to moderate levels by the end of next week.
As for the remaining weather details, a drier than normal trade wind pattern should remain today as middle and upper ridges remain over the islands. However, periods of high cloud will pass through the region, resulting in partially sunny conditions in many areas today. The ridge will collapse upstream of the state tonight, which should lead to an increase in trade wind showers, especially as we approach daybreak on Saturday as the cirrus slowly thins at altitude. The fairly typical trade wind weather should then continue until the end of next week. Rain showers will continue to favor windward and mauka areas, especially at night and early in the morning, with some rain showers reaching leeward areas from time to time due to the strength of the trades.

aviation

Windy to strong trade winds will lead to low-level turbulence throughout the state in the wind direction of the island, which will last until the weekend. AIRMET Tango, which reflects this, remains in force. MVFR CIGS / VSBYS are possible in and around passing showers with a focus on windward and mauka areas. Otherwise, VFR conditions will prevail with limited showers over the void areas.

marine

High pressure north of the state will create a sufficiently tight pressure gradient across the islands to maintain fresh to locally strong trade for the next few days. Last night’s ASCAT satellite pass captured enough of the island’s coastal waters to show large winds of 25 knots off the Big Island’s South Point and within the Alenuihaha Channel … along with some strong wind reports around Moloka’i and south of Oahu’s Diamond Head. The eastward movement of the high in the next few days will change the pressure gradient in the central Pacific very little and therefore result in a slight deviation from these persistently fresh to locally strong trades. The Small Craft Advisory (SCA) has expanded westward to include all Hawaiian coastal waters by early Saturday morning. The SCA will extend through early Sunday morning for the normally windier areas on the east end of the state. Trades could subtly weaken to more moderate, locally fresh magnitudes early next week.
The south swell continues to decrease with a very small, long-term gain that is being replenished today. Small, sustained south swell energy from recent storms in the southern hemisphere southeast of New Zealand is expected to arrive mid-next week. A small, medium-term northwest swell is expected to hit the islands late Saturday through Sunday. A series of slightly larger, medium-term northwest swells from a North Pacific storm low over the weekend will come through next week. The return of fresh trade has resulted in a steady increase in eastbound coastal surf. The east surf should stay at seasonal levels for the next few days due to these increased trades above and upstream of the region.

Fire weather

Gusty winds in combination with dry fuels and low relative humidity lead to an increased risk of fire today. Fires that develop spread quickly and are difficult to control. As a result, a red flag warning was posted for leeward sections of Kauai, Oahu, Molokai, Maui, and the Big Island by 6:00 p.m. tonight.

HFO watches / warnings / notices

Red flag warning until 6:00 p.m. HST tonight for Kauai Windward, 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 Sunday 6:00 AM HST for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.
Small boat advice through Saturday 6:00 a.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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