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Long Island weather: High heat and humidity Thursday, Friday

Trish Ohlmann of Manhasset, center, works out in

Trish Ohlmann of Manhasset, center, works out in the shade in a small group training class at Christopher Morley Park, run by personal trainer Andrew Haskell of Massapequa, Wednesday. Credit: Danielle Silverman

The National Weather Service has issued a heat advisory for Long Island for Thursday and Friday, predicting heat values up to more than 100 degrees that could possibly last until Saturday.

The advisory, which starts at 11 a.m. Thursday, affects all of Long Island.

"Hot and humid conditions will lead to maximum heat index values in the mid 90s Thursday and upper 90s to low 100s Friday," the advisory said.

The worst of the heat will be from about 1 p.m. to 5 p.m. Thursday and Friday afternoon, the weather service said.

Heat values mean how the weather really feels, factoring in the actual temperature plus the humidity.

Once again, there could be showers and thunderstorms Wednesday night, when the odds of rain are 30%.

"A severe storm cannot be ruled out with the main threat damaging winds," the weather service said, though storm forecasters assess the risk as marginal for most of the region.

This sultry weather will dominate much of the eastern United States ahead of cooler weekend weather, according to the weather service’s Weather Prediction Center.

In much of the central and southwest parts of the nation, intense rain and flooding are expected. At least, the blistering heat the West has been coping with is finally easing, though just slightly.

And Saturday afternoon could be wet, with the weather service estimating the odds of downpours and thunderstorms after 2 p.m. at 50%.

On Sunday, storms may cap daytime thermometers at about 80 degrees. Showers and possible thunderstorms storms may sweep in as soon as 8 a.m. or so, the weather service said. The precipitation odds are 60%.

However, it could be warmer or cooler this weekend, depending on how many downpours and possible storms sail through the region, the weather service said.

"Temperature forecast is of low confidence" as a result, it said.

On Monday, the shower odds are 40%, and the daytime high should reach 81 degrees.

Tuesday should be sunny with thermometers rising to about 83 degrees.

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