Heavy Rain and Possible Flash Flooding in the Northeast and Northern Mid-Atlantic

A strong cold front will push through the Eastern U.S. today with strong thunderstorms, heavy rain and possible flooding. The main zone for these hazards will be from portions of the Mid-Atlantic into parts of the Northeast, as a tremendous amount of moisture interacts with the cold front. This includes a portion of the I-95 corridor from Baltimore to Philadelphia and New York City. Read More >

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

75°F

24°C

Humidity 94%
Wind Speed SE 18 G 24 mph
Barometer 29.96 in (1014.5 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 23 Sep 8:56 pm EDT
Extended Forecast for

Smithtown NY

  • Tonight

    Tonight: Scattered showers, then periods of rain and possibly a thunderstorm after 11pm. Some of the storms could produce gusty winds and heavy rain.  Low around 62. South wind 11 to 18 mph, with gusts as high as 38 mph.  Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Heavy Rain

    Low: 62 °F

  • Friday

    Friday: Rain likely and possibly a thunderstorm before 11am, then a chance of showers, mainly between 11am and 2pm. Some of the storms could produce gusty winds and heavy rain.  Mostly cloudy, with a high near 69. West wind 5 to 9 mph.  Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Heavy Rain

    High: 69 °F

  • Friday
    Night

    Friday Night: Mostly clear, with a low around 56. Southwest wind around 6 mph becoming north after midnight.

    Mostly Clear

    Low: 56 °F

  • Saturday

    Saturday: Mostly sunny, with a high near 75. North wind 5 to 7 mph.

    Mostly Sunny

    High: 75 °F

  • Saturday
    Night

    Saturday Night: A 30 percent chance of showers, mainly between 8pm and midnight.  Mostly cloudy, with a low around 58. South wind 5 to 8 mph becoming west after midnight.

    Chance
    Showers

    Low: 58 °F

  • Sunday

    Sunday: Mostly sunny, with a high near 74.

    Mostly Sunny

    High: 74 °F

  • Sunday
    Night

    Sunday Night: Mostly clear, with a low around 57.

    Mostly Clear

    Low: 57 °F

  • Monday

    Monday: Sunny, with a high near 74.

    Sunny

    High: 74 °F

  • Monday
    Night

    Monday Night: Mostly clear, with a low around 60.

    Mostly Clear

    Low: 60 °F

Detailed Forecast

Tonight
Scattered showers, then periods of rain and possibly a thunderstorm after 11pm. Some of the storms could produce gusty winds and heavy rain. Low around 62. South wind 11 to 18 mph, with gusts as high as 38 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Friday
Rain likely and possibly a thunderstorm before 11am, then a chance of showers, mainly between 11am and 2pm. Some of the storms could produce gusty winds and heavy rain. Mostly cloudy, with a high near 69. West wind 5 to 9 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Mostly clear, with a low around 56. Southwest wind around 6 mph becoming north after midnight.
Saturday
Mostly sunny, with a high near 75. North wind 5 to 7 mph.
Saturday Night
A 30 percent chance of showers, mainly between 8pm and midnight. Mostly cloudy, with a low around 58. South wind 5 to 8 mph becoming west after midnight.
Sunday
Mostly sunny, with a high near 74.
Sunday Night
Mostly clear, with a low around 57.
Monday
Sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 59.
Wednesday
Partly sunny, with a high near 74.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
Mostly sunny, with a high near 73.
Click Map For Forecast
Point Forecast:
Smithtown NY
 40.86°N 73.19°W (Elev. 98 ft)
3:31 pm EDT Sep 23, 2021
9pm EDT Sep 23, 2021-6pm EDT Sep 30, 2021
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database