Dangerous Heat, Thunderstorms Possible All Weekend in Mamaroneck

It’s hard to keep track of all the different advisories issued by the National Weather Service this weekend. The National Weather Service, in fact, has two special notices on its southern Westchester weather page:

• Excessive Heat Warning in effect August 14, 10:00 PM EDT
• Hazardous Weather Outlook

What this all adds up to is it’s going to be hot—likely dangerously hot—if you’re outdoors for prolonged periods of time, and there will be several chances beginning today and continuing through the weekend for fast-moving thunderstorms that pop up out of nowhere. Any storms will be capable of producing torrential rainfall and localized flash flooding, the National Weather Service warns.

The biggest factor will be the humidity.

While stifling days are not uncommon during the dogs days of summer, humidity levels will make it feel more like the Deep South than the Northeast, AccuWeather meteorologists said.

Here's the NWS weekend forecast for southern Westchester County:

• Today: Scattered showers and thunderstorms, mainly after noon. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 93. Heat index values as high as 103. Southwest wind around 9 mph. Chance of precipitation is 40%.
• Tonight: Scattered showers and thunderstorms, mainly before midnight. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 78. West wind 3 to 7 mph. Chance of precipitation is 40%.
• Saturday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Some of the storms could produce heavy rainfall. Partly sunny and hot, with a high near 95. Heat index values as high as 106. Southwest wind 5 to 9 mph.
• Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 78. Southwest wind around 7 mph.
• Sunday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Some of the storms could produce heavy rain. Partly sunny, with a high near 91. Southwest wind 6 to 9 mph.
• Sunday Night: A 50 percent chance of showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 73.

MAP: AccuWeather.com