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Risk of severe thunderstorms from Florida to the Great Lake States

Storms may contain strong, damaging winds and hail. Locally heavy rain is also possible in southern California and the Desert Southwest. Very hot conditions continue in the lower Mississippi Valley and the Deep South.
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Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

76°F

24°C

Humidity 91%
Wind Speed SW 7 mph
Barometer 29.91 in (1012.5 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 30 Jul 5:56 am EDT
Extended Forecast for

Port Jefferson NY

  • Today

    Today: Showers and thunderstorms likely, mainly after 4pm. Some of the storms could produce gusty winds and heavy rain.  Mostly cloudy, with a high near 85. Southwest wind 8 to 16 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

    High: 85 °F

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before midnight. Some of the storms could produce gusty winds and heavy rain.  Cloudy, then gradually becoming partly cloudy, with a low around 71. Southwest wind 6 to 13 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: 71 °F

  • Friday

    Friday: Sunny, with a high near 89. West wind 7 to 10 mph.

    Sunny

    High: 89 °F

  • Friday
    Night

    Friday Night: Mostly clear, with a low around 69. West wind around 6 mph becoming calm  in the evening.

    Mostly Clear

    Low: 69 °F

  • Saturday

    Saturday: Sunny, with a high near 87. Southwest wind 7 to 13 mph.

    Sunny

    High: 87 °F

  • Saturday
    Night

    Saturday Night: A slight chance of showers and thunderstorms.  Partly cloudy, with a low around 71. Chance of precipitation is 20%.

    Slight Chance
    T-storms

    Low: 71 °F

  • Sunday

    Sunday: Sunny, with a high near 86.

    Sunny

    High: 86 °F

  • Sunday
    Night

    Sunday Night: Partly cloudy, with a low around 73.

    Partly Cloudy

    Low: 73 °F

  • Monday

    Monday: Mostly sunny, with a high near 85.

    Mostly Sunny

    High: 85 °F

Detailed Forecast

Today
Showers and thunderstorms likely, mainly after 4pm. Some of the storms could produce gusty winds and heavy rain. Mostly cloudy, with a high near 85. Southwest wind 8 to 16 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms likely, mainly before midnight. Some of the storms could produce gusty winds and heavy rain. Cloudy, then gradually becoming partly cloudy, with a low around 71. Southwest wind 6 to 13 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
Sunny, with a high near 89. West wind 7 to 10 mph.
Friday Night
Mostly clear, with a low around 69. West wind around 6 mph becoming calm in the evening.
Saturday
Sunny, with a high near 87. Southwest wind 7 to 13 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 86.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Mostly sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 72.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 72.
Wednesday
Mostly sunny, with a high near 86.
  Click Map For Forecast
Point Forecast:
Port Jefferson NY
 40.95°N 73.05°W (Elev. 151 ft)
3:52 am EDT Jul 30, 2015
6am EDT Jul 30, 2015-6pm EDT Aug 5, 2015
 
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Additional Resources

Radar & Satellite Image

Northeast Radar Mosaic Link to Satellite Data

Hourly Weather Graph

National Digital Forecast Database