Heat Index Could Top 100 Degrees On Long Island

LONG ISLAND, NY — A heat advisory will be in effect Thursday and Friday on Long Island with the heat index expected to flirt with 100 degrees.

The highest temperatures and heat indices are expected between 1 p.m and 5 p.m. each day, the National Weather Service says.

The heat advisory will be in effect from 11 a.m. Thursday until 8 p.m. Friday. Temperatures are expected to reach the 90s both days on the island, with Friday being the hotter of the two.

"Because of elevated dew points temperatures are only expected to fall into the upper 70s overnight [Thursday] leading into Friday," the NWS says. "This lack of overnight relief contributes to the heat expected in the afternoon Friday as widespread temperatures in the upper 90s are anticipated throughout the forecast area."

Seniors and those with chronic health problems or mental health conditions are at an increased risk. Homes without air conditioning can be much hotter than outdoor temperatures.

Use air conditioning to stay cool at home or go to a place that has air conditioning. Check on vulnerable friends, family members and neighbors.

Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke
is an emergency. In cases of heat stroke, call 9 1 1.

The full forecast:

Wednesday Night- Mostly cloudy, then gradually becoming mostly clear, with a low around 73. West wind 3 to 7 mph.

Thursday- Sunny, with a high near 90. Heat index values as high as 95. Light and variable wind becoming south 5 to 8 mph in the afternoon.

Thursday Night- Partly cloudy, with a low around 74. South wind 6 to 8 mph.

Friday- Mostly sunny, with a high near 91. Heat index values as high as 98. Southwest wind 6 to 10 mph.

Friday Night- A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 74. Southwest wind 6 to 10 mph.

Saturday- Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night- Showers likely and possibly a thunderstorm before 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%.

Sunday- A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 84. Chance of precipitation is 60%.

Sunday Night- Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.

Monday- A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 83. Chance of precipitation is 40%.