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Heavy Rain and Potential for Flash Flooding

Strong to severe thunderstorms are forecast to develop along a frontal system stretching from portions of the Mississippi Valley into the Ohio Valley. These storms may produce heavy rain and flash flooding. The threat shifts east on Friday. Moonsoon moisture will continue to produce heavy rain with the possibility of localized flash flooding in the Four Corners area. Read More >

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79° N Lon: 73.1° W Elev: 98 ft.




Humidity 85%
Wind Speed S 8 mph
Barometer 29.91 in (1012.6 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 27 Jul 7:56 pm EDT
Detailed forecast for

Southwest Suffolk

Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the upper 60s. South winds 10 to 15 mph. Chance of rain 40 percent.
Partly sunny. Humid with highs in the lower 80s. North winds around 5 mph, becoming east in the afternoon.
Friday Night
Cloudy. A chance of rain in the evening, then rain after midnight. Rain may be heavy at times after midnight. Humid with lows in the upper 60s. East winds 10 to 15 mph. Gusts up to 25 mph after midnight. Chance of rain 90 percent.
Rain likely in the morning, then light rain likely in the afternoon. Windy with highs in the lower 70s. Northeast winds 20 to 30 mph with gusts up to 45 mph. Chance of rain 70 percent.
Saturday Night
Cloudy. Light rain likely, mainly in the evening. Breezy with lows in the lower 60s. Northeast winds 20 to 25 mph with gusts up to 40 mph. Chance of rain 60 percent.
Mostly cloudy with a chance of light rain in the morning, then partly sunny in the afternoon. Highs in the upper 70s. Chance of rain 30 percent.
Sunday Night
Mostly cloudy. Lows in the mid 60s.
Mostly cloudy. Highs in the mid 70s.
Monday Night
Mostly cloudy. Lows in the mid 60s.
Mostly sunny. Highs in the lower 80s.
Tuesday Night
Partly cloudy. Lows around 70.
Sunny. Highs in the mid 80s.
Wednesday Night
Mostly clear. Lows in the lower 70s.
Sunny. Highs in the mid 80s.

Click Map For Forecast
652 PM EDT Thu Jul 27 2017

Additional Resources

Radar & Satellite Image

Northeast Radar Mosaic Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database