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Effective July 7, 2015, NWS will implement changes to the icons depicted on all of its Point Forecast pages. Highlights will include new icons with increased clarity, 6-hour increments for rapidly changing weather and new color blocks to highlight forecast hazards.

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Severe weather and flash flooding will be possible again on Thursday

Severe weather will be possible Thursday from the southern Plains to the southern Appalachians. Damaging winds and large hail are the primary threats. In addition, heavy rainfall could lead to flash flooding across portions of the Tennessee and Ohio Valleys.
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Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

63°F

17°C

Humidity 87%
Wind Speed Calm
Barometer 29.87 in (1011.5 mb)
Dewpoint 59°F (15°C)
Visibility 8.00 mi
Last update 2 Jul 5:56 am EDT
Extended Forecast for

Port Jefferson NY

  • Today

    Mostly Sunny

    Mostly
    Sunny

    High: 80 °F

  • Tonight

    Mostly Cloudy

    Mostly
    Cloudy

    Low: 64 °F

  • Friday

    Mostly Sunny

    Mostly
    Sunny

    High: 78 °F

  • Friday
    Night

    Slight Chance Showers Chance for Measurable Precipitation 20%

    Slight Chc
    Showers

    Low: 64 °F

  • Independence
    Day

    Slight Chance Showers Chance for Measurable Precipitation 20%

    Slight Chc
    Showers

    High: 75 °F

  • Saturday
    Night

    Slight Chance Showers Chance for Measurable Precipitation 20%

    Slight Chc
    Showers

    Low: 61 °F

  • Sunday

    Sunny

    Sunny

    High: 83 °F

  • Sunday
    Night

    Mostly Clear

    Mostly
    Clear

    Low: 66 °F

  • Monday

    Sunny

    Sunny

    High: 83 °F

Detailed Forecast

Today
Mostly sunny, with a high near 80. Light and variable wind becoming southwest 5 to 7 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 64. Southwest wind 5 to 7 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 78. North wind 6 to 8 mph becoming southwest in the afternoon.
Friday Night
A slight chance of showers after 3am. Partly cloudy, with a low around 64. South wind 5 to 7 mph becoming light and variable. Chance of precipitation is 20%.
Independence Day
A slight chance of showers. Cloudy, with a high near 75. Northeast wind around 9 mph. Chance of precipitation is 20%.
Saturday Night
A slight chance of showers before 3am. Mostly cloudy, then gradually becoming mostly clear, with a low around 61. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 83.
Sunday Night
Mostly clear, with a low around 66.
Monday
Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 66.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 81.
  Click Map For Forecast
Point Forecast:
Port Jefferson NY
 40.95°N 73.05°W (Elev. 151 ft)
5:30 am EDT Jul 2, 2015
7am EDT Jul 2, 2015-6pm EDT Jul 8, 2015
 
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Additional Resources

Radar & Satellite Image

Northeast Radar Mosaic Link to Satellite Data

Hourly Weather Graph

National Digital Forecast Database