Long Island forecast: Excessive heat warning for parts of LI expanded through Friday evening

The real-feel temperature could reach as high as 110 degrees in some parts of Long Island Thursday, the second of three days this week in which the National Weather Service has issued excessive heat warnings.

The warnings were expanded Wednesday night to last from 11 a.m. Thursday until 8 p.m. Friday and cover all but southeastern Suffolk, a Wednesday night briefing said.

Predicted highs were also boosted, with 95 degrees forecast for Thursday and 94 degrees Friday before the promise of relief Friday night.

"Hot and humid conditions are expected through the end of the work week, with heat index values ranging from the mid 90s to mid 100s through Friday. The heat may linger into Saturday, depending on the timing of a cold frontal passage," the weather service said.

There may be scattered thunderstorms Thursday and Friday afternoon but the best chance for a significant cooldown is Friday evening, when some storms could be severe, the weather service said.

Saturday's high will be in the high 80s, the weather service said.

The maximum real-feel heat index, which factors in humidity, was up to 105 degrees Wednesday and will be anywhere from 105 degrees to 110 degrees Thursday in Nassau and northwestern Suffolk, forecasters said.

And although southeastern Suffolk is not covered by the warning, the area is still expected to see high heat and humidity, and are under excessive heat advisories.

"Hot temperatures and high humidity may cause heat illnesses to occur," the weather service warned, adding that people with health issues and seniors should stay indoors in air-conditioning or seek cooling centers.

Those who work outside were encouraged to take breaks in the shade and keep hydrated.