Powerful Storm to Impact Eastern Third of U.S. this weekend.

A developing storm system will bring a myriad of significant impacts this weekend. Heavy snow up to 18 inches from the Ohio Valley to the Northeast, and ice up to a quarter of an inch is forecast in places. Heavy rain may cause flash flooding from the Mid-South to the Mid-Atlantic. Severe thunderstorms with damaging winds and isolated tornadoes will be possible in the Deep South. Read More >

Hazardous Weather Conditions

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Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

36°F

2°C

Humidity	55%
Wind Speed	NE 9 mph
Barometer	30.27 in (1024.9 mb)
Dewpoint	21°F (-6°C)
Visibility	10.00 mi
Wind Chill	29°F (-2°C)
Last update	19 Jan 10:56 am EST

More Information:

Local Forecast Office More Local Wx 3 Day History Mobile Weather Hourly Weather Forecast

Extended Forecast for

Patchogue NYSimilar City Names

Coastal Flood Advisory January 20, 06:00am until January 20, 01:00pm

Click here for hazard details and duration

Coastal Flood Advisory

Today

Chance Snow
High: 37 °F
Tonight

Breezy.
Rain/Snow
then Heavy
Rain
Low: 33 °F⇑
Sunday

Heavy Rain
then Wintry
Mix Likely
and Breezy
High: 42 °F⇓
Sunday
Night

Mostly Cloudy
and Blustery
Low: 9 °F
M.L.King
Day

Cold and
Blustery
High: 16 °F
Monday
Night

Mostly Clear
and Blustery
Low: 13 °F
Tuesday

Sunny
High: 29 °F
Tuesday
Night

Mostly Cloudy
Low: 26 °F
Wednesday

Chance
Rain/Sleet
then Chance
Rain
High: 46 °F

Detailed Forecast

Today

A 40 percent chance of snow after 4pm. Mostly cloudy, with a high near 37. Wind chill values between 25 and 30. East wind 8 to 10 mph.

Tonight

Snow before 10pm, then rain. The rain could be heavy at times. Temperature rising to around 41 by 4am. Wind chill values between 20 and 25. Breezy, with an east wind 13 to 20 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

Sunday

Rain before 4pm, then a slight chance of freezing rain and sleet. The rain could be heavy at times. Temperature rising to near 42 by 9am, then falling to around 27 during the remainder of the day. Wind chill values between 15 and 25. Breezy, with an east wind 7 to 12 mph becoming northwest 16 to 21 mph in the afternoon. Winds could gust as high as 37 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. Little or no sleet accumulation expected.

Sunday Night

Mostly cloudy, with a low around 9. Wind chill values between -10 and zero. Blustery, with a northwest wind 22 to 24 mph, with gusts as high as 39 mph.

M.L.King Day

Mostly sunny and cold, with a high near 16. Blustery, with a northwest wind around 23 mph, with gusts as high as 34 mph.

Monday Night

Mostly clear, with a steady temperature around 13. Blustery.

Tuesday

Sunny, with a high near 29.

Tuesday Night

Mostly cloudy, with a low around 26.

Wednesday

A chance of rain and sleet before 7am, then a chance of rain. Mostly cloudy, with a high near 46. Chance of precipitation is 40%.

Wednesday Night

A 30 percent chance of rain. Mostly cloudy, with a low around 39.