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Severe Thunderstorms With Heavy Rain Possible In The Upper Midwest; Excessive Heat For Central U.S.

Several rounds of strong to severe thunderstorms will be possible from the northern Plains and upper Midwest to the Great Lakes through Friday. Damaging winds, large hail, and flooding will be the primary threats with these storms. Excessive heat will grip the central Plains with heat indices approaching 105 to 110 degrees. Very hot and humid conditions are likely to expand into the Mid Atlantic. Read More >

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

84°F

29°C

Humidity 61%
Wind Speed NW 13 mph
Barometer 29.91 in (1012.6 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 21 Jul 9:56 am EDT
Extended Forecast for

Sayville NY

Heat Advisory until July 21, 06:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 21, 06:00pm

    NOW until
    6:00pm Fri

    Heat Advisory

  • Today

    Today: Sunny, with a high near 92. West wind 6 to 13 mph.

    Sunny

    High: 92 °F

  • Tonight

    Tonight: Mostly clear, with a low around 72. Southwest wind 5 to 9 mph becoming light and variable  after midnight.

    Mostly Clear

    Low: 72 °F

  • Saturday

    Saturday: Mostly sunny, with a high near 85. North wind 5 to 10 mph becoming south in the afternoon.

    Mostly Sunny

    High: 85 °F

  • Saturday
    Night

    Saturday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Some of the storms could produce gusty winds and heavy rain.  Increasing clouds, with a low around 73. South wind 7 to 9 mph.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Heavy Rain

    Low: 73 °F

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Some of the storms could produce heavy rain.  Mostly cloudy, with a high near 82. West wind around 7 mph.  Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Heavy Rain

    High: 82 °F

  • Sunday
    Night

    Sunday Night: A 50 percent chance of showers.  Mostly cloudy, with a low around 71.

    Chance
    Showers

    Low: 71 °F

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 81.

    Chance
    T-storms

    High: 81 °F

  • Monday
    Night

    Monday Night: A 40 percent chance of showers.  Mostly cloudy, with a low around 70.

    Chance
    Showers

    Low: 70 °F

Detailed Forecast

Today
Sunny, with a high near 92. West wind 6 to 13 mph.
Tonight
Mostly clear, with a low around 72. Southwest wind 5 to 9 mph becoming light and variable after midnight.
Saturday
Mostly sunny, with a high near 85. North wind 5 to 10 mph becoming south in the afternoon.
Saturday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Some of the storms could produce gusty winds and heavy rain. Increasing clouds, with a low around 73. South wind 7 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers likely and possibly a thunderstorm. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 82. West wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 71.
Monday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 70.
Tuesday
A 30 percent chance of showers before 2pm. Partly sunny, with a high near 79.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 80.
Click Map For Forecast
Point Forecast:
Sayville NY
 40.74°N 73.1°W (Elev. 30 ft)
6:49 am EDT Jul 21, 2017
10am EDT Jul 21, 2017-6pm EDT Jul 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