Sweltering Heat Before More Storms For Long Island

Nearly 5 inches of rain fell on Long Island through the first 13 days of August, three times more than normal for the period, and there's more on the way Friday and Saturday.

"Thunderstorms late Friday into Friday night may produce strong winds and heavy rain which could result in flash flooding," the National Weather Service said in a hazardous weather outlook issued for the island.

Thursday will be dry, but very hot. A heat advisory is in effect in Nassau County until 6 p.m. Friday with heat index values expected to reach the mid-90s.

Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency. Dial 911 if it's suspected.

The rain may hold off until sunset Friday, but the NWS says thunderstorms are likely from 8-11 p.m. A chance of showers and thunderstorms will continue through the day Saturday. Sunday should be dry, but much cooler with highs in the 70s.

The full forecast:

Thursday- Mostly sunny, with a high near 91. West wind 5 to 10 mph.

Thursday Night- Partly cloudy, with a low around 74. Southwest wind 5 to 9 mph becoming light west after midnight.

Friday- A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 85. Light southwest wind becoming south 8 to 13 mph in the morning.

Friday Night- Showers and thunderstorms likely, mainly between 9pm and 1am. Cloudy, with a low around 74. South wind 9 to 14 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Saturday- A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 86. West wind around 10 mph.

Saturday Night- A 30 percent chance of showers and thunderstorms before 4am. Mostly cloudy, with a low around 67.

Sunday- Partly sunny, with a high near 77.

Sunday Night- Partly cloudy, with a low around 64.

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