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Heavy Rains and Potential for Flash Floods

Severe thunderstorms with damaging winds and heavy rains will be possible from the Ohio Valley to the Northeast Tuesday. In addition, heavy rains possible in the central Plains and southern Rockies. Heavy rain threat moves into the southern Mid-Atlantic Wednesday. Dry conditions remain out west where isolated dry thunderstorms could exacerbate ongoing fires and start new fires. Read More >

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

75°F

24°C

Humidity 90%
Wind Speed SW 8 mph
Barometer 30.10 in (1019.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 21 Aug 11:56 pm EDT
Extended Forecast for

Stony Brook NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 73. Southwest wind around 6 mph.

    Mostly Cloudy

    Low: 73 °F

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before noon.  Partly sunny, with a high near 86. Southwest wind 8 to 16 mph.

    Slight Chance
    T-storms then
    Mostly Sunny

    High: 86 °F

  • Tuesday
    Night

    Tuesday Night: Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight.  Mostly cloudy, with a low around 72. Southwest wind 14 to 17 mph.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Scattered
    T-storms then
    Showers
    Likely

    Low: 72 °F

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly before noon.  Partly sunny, with a high near 82. West wind 11 to 13 mph.

    Chance
    T-storms

    High: 82 °F

  • Wednesday
    Night

    Wednesday Night: Partly cloudy, with a low around 65. North wind 7 to 9 mph.

    Partly Cloudy

    Low: 65 °F

  • Thursday

    Thursday: Sunny, with a high near 79.

    Sunny

    High: 79 °F

  • Thursday
    Night

    Thursday Night: Mostly clear, with a low around 62.

    Mostly Clear

    Low: 62 °F

  • Friday

    Friday: Sunny, with a high near 77.

    Sunny

    High: 77 °F

  • Friday
    Night

    Friday Night: Mostly clear, with a low around 61.

    Mostly Clear

    Low: 61 °F

Detailed Forecast

Overnight
Mostly cloudy, with a low around 73. Southwest wind around 6 mph.
Tuesday
A 20 percent chance of showers and thunderstorms before noon. Partly sunny, with a high near 86. Southwest wind 8 to 16 mph.
Tuesday Night
Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 72. Southwest wind 14 to 17 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before noon. Partly sunny, with a high near 82. West wind 11 to 13 mph.
Wednesday Night
Partly cloudy, with a low around 65. North wind 7 to 9 mph.
Thursday
Sunny, with a high near 79.
Thursday Night
Mostly clear, with a low around 62.
Friday
Sunny, with a high near 77.
Friday Night
Mostly clear, with a low around 61.
Saturday
Sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 62.
Sunday
Sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 63.
Monday
Sunny, with a high near 78.
Click Map For Forecast
Point Forecast:
Stony Brook NY
 40.92°N 73.12°W (Elev. 112 ft)
9:31 pm EDT Aug 21, 2017
12am EDT Aug 22, 2017-6pm EDT Aug 27, 2017
 
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Additional Resources

Radar & Satellite Image

Northeast Radar Mosaic Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database