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Slight relief from heat as light tradewinds return Friday

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A weather system north of the islands that has been blocking the tradewinds is beginning to weaken, allowing light tradewinds to blow starting Friday.

It will still be hot and humid, but light tradewinds may provide a little relief from the muggy weather.

The National Weather Service expects tradewinds to gradually strengthen beginning Friday afternoon through the beginning of next week.

The winds won’t be strong enough to keep humid sea breezes from forming in the afternoons and bringing some isolated showers to leeward and mauka slopes.

But morning tradewind showers in windward and mauka sections could return this weekend.

“It’s still going to be uncomfortable,” said Maureen Ballard, a meteorologist with the Honolulu office of the National Weather Service. But, “after the last couple of days when we’ve had no wind, we should feel a little bit of a breeze late tomorrow into Saturday.”

Temperatures will continue to be close to record levels.

The forecast calls for mostly sunny to partly cloudy skies, highs of 85 to 91 degrees through Monday, and east winds of up to 15 mph.

The mercury reached 89 degrees in Lihue, the National Weather Service said. That broke the earlier record of 87 degrees, set in 1982.

It also tied the record for the warmest July day on Kauai, reached on July 12, 1979, and July 7, 1981.

On Maui, Kahului saw the temperature reach 92 degrees. That broke the old record of 91, set in 1980.

Surfers can expect waves on all shores as the holiday weekend begins.

A south swell on southern shores is bringing 3- to 5-foot surf Thursday. The swell is expected to decrease to 2- to 4-feet Friday. But a reinforcement swell could arrive Saturday night and surf could reach advisory levels on Sunday.

An out-of-season north swell will bring 5- to 7-foot waves Thursday, decreasing to 2 to 4 feet Friday.

West shores should see a wrap from both swells with 3- to 5-foot surf through Friday.

East shores are expecting 1- to 3-foot surf Thursday, increasing to 2- to 4-feet Friday.

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