Weather Forecast

Hawaii County Weather Forecast for November 21, 2021

November 21, 2021, 7:15 AM HST
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Hilo

Today: Partly sunny in the morning then becoming mostly sunny. Isolated showers. Highs 78 to 83 near the shore to 65 to 71 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Tonight: Mostly cloudy with scattered light showers. Lows 62 to 70 near the shore to 53 to 59 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Monday: Partly sunny with scattered light showers in the morning, then mostly sunny with isolated light showers in the afternoon. Highs 76 to 82 near the shore to 63 to 69 at 4000 feet. East winds 10 to 15 mph. Chance of rain 40 percent.

Kona

Today: Mostly sunny. Isolated showers in the afternoon. Highs around 85 near the shore to around 68 near 5000 feet. Light winds. Chance of rain 20 percent.

Tonight: Partly cloudy with isolated light showers. Lows 68 to 74 near the shore to 48 to 55 near 5000 feet. Light winds. Chance of rain 20 percent.

ARTICLE CONTINUES BELOW AD

Monday: Mostly sunny in the morning, then partly sunny with isolated light showers in the afternoon. Highs 82 to 87 near the shore to around 68 near 5000 feet. Light winds. Chance of rain 20 percent.

Waimea

ARTICLE CONTINUES BELOW AD

Today: Breezy. Mostly sunny with isolated showers. Highs 66 to 83. East winds 10 to 20 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Isolated light showers in the evening, then scattered light showers after midnight. Lows 62 to 68 near the shore to 55 to 63 near 3000 feet. East winds 10 to 15 mph. Chance of rain 40 percent.

Monday: Mostly sunny with isolated light showers. Highs 65 to 83. East winds 10 to 15 mph. Chance of rain 20 percent.

Kohala

ARTICLE CONTINUES BELOW AD

Today: Breezy. Mostly sunny with isolated showers. Highs 66 to 83. East winds 10 to 20 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Isolated light showers in the evening, then scattered light showers after midnight. Lows 62 to 68 near the shore to 55 to 63 near 3000 feet. East winds 10 to 15 mph. Chance of rain 40 percent.

Monday: Mostly sunny with isolated light showers. Highs 65 to 83. East winds 10 to 15 mph. Chance of rain 20 percent.

South Big Island

Today: Sunny and breezy. Isolated showers in the afternoon. Highs around 83 near the shore to around 67 near 5000 feet. East winds up to 25 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Lows around 72 near the shore to around 51 near 5000 feet. Northeast winds 10 to 15 mph.

Monday: Mostly sunny. Breezy. Isolated light showers in the afternoon. Highs around 83 near the shore to around 67 near 5000 feet. East winds 10 to 20 mph. Chance of rain 20 percent.

Puna

Today: Partly sunny in the morning then becoming mostly sunny. Isolated showers. Highs 78 to 83 near the shore to 65 to 71 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Tonight: Mostly cloudy with scattered light showers. Lows 62 to 70 near the shore to 53 to 59 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Monday: Partly sunny with scattered light showers in the morning, then mostly sunny with isolated light showers in the afternoon. Highs 76 to 82 near the shore to 63 to 69 at 4000 feet. East winds 10 to 15 mph. Chance of rain 40 percent.

Waikoloa

Today: Sunny. Isolated showers in the afternoon. Highs 81 to 87 near the shore to 66 to 72 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Lows 69 to 74 near the shore to 48 to 55 above 4000 feet. East winds up to 10 mph.

Monday: Mostly sunny. Highs 81 to 87 near the shore to 66 to 71 above 4000 feet. North winds up to 10 mph.

Detailed Forecast

Synopsis

Trade winds will range from gentle to locally breezy through the upcoming holiday. Our airmass will be rather dry and stable through Tuesday. A minor increase in trade wind showers is expected about Tuesday night as additional moisture begins to return.

Discussion

There is little to no change in forecast philosophy from last evening. A weak ridge north of the main Hawaiian Islands supports light easterly trade flow from the Big island through Oahu, while light northerly flow persists near Kauai. Satellite loop shows patchy broken to overcast low clouds across windward portions of the Big Island, while scattered low clouds to clear skies are noted over the smaller islands. Land breezes across the smaller islands will likely keep cloud cover to a minimum there through much of this morning. Returning trade flow will cause a gradual increase in cloud cover across windward areas later today.
A surface high far north of the islands is passing eastward. This will initially boost trades to locally breezy levels today and Monday. After the high passes eastward, a nearly stationary surface ridge will get left behind through the remainder of the forecast period. Expect gentle to locally breezy trades through Saturday. Low clouds and showers will favor windward areas as trade winds spread westward and persist. Trade showers will increase slightly Tuesday night as additional moisture begins to return within trade flow.

Aviation

Trade winds will continue to strengthen this morning, reaching moderate to locally breezy levels by this afternoon. Rather dry weather is expected during the next 24 hours, with prevailing VFR conditions at the terminals.
SIGMET Victor remains in effect for severe upper level turbulence between FL260 and FL410 early this morning. Severe upper level turbulence is forecast to remain over the state through the day and much of tonight.

Marine

Trade winds are forecast in the moderate to locally strong range today, as a high pressure ridge builds in north of the island chain. Trade wind speeds will reach Small Craft Advisory (SCA) levels for the typically windy waters around Maui County and the Big Island and a SCA remains in effect for these areas. Moderate to locally strong trades will continue through Thursday.
Surf will remain small for all shores into Tuesday. A slight bump in northwest swell energy will increase surf along north and west facing shores from Monday night through Tuesday. A larger northwest swell will arrive on Wednesday, likely bringing advisory level surf along exposed north and west facing shores by Thanksgiving Day. Stronger trade winds developing over and upstream of the islands will bring an increase in surf along east facing shores early next week. South shore surf will remain very small through the forecast period.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Monday 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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