WHAT'S NEW: Extreme cold. Temperatures 15 to 20 degrees below average.

NORMAL HIGH 39 - Normal low 24

UV INDEX - Low

SNOW TOTALS: Most of Nassau County 2 to 4 inches, Suffolk county basically 1 to 4 inches

The bitter blast is with Long Island through Thursday. Bundle up with this surge of arctic air with low temperatures dropping into the single digits for parts of Long Island the next few days and wind chills can fall to 5 below. A slow warm up towards the weekend as highs approach 40.

TODAY: Sun and clouds. Breezy and cold with a high near 28. Wind chill values between 5 and 15. Northwest wind 10-20 mph.

TONIGHT: Mostly clear, with a low around 10. Wind chill values between zero and 5. West wind 5 to 15 mph.

TUESDAY: Mostly cloudy, with a high near 21. Wind chill values between zero and 10. West wind around 10 mph.

TUESDAY NIGHT: A 20% chance of light snow before 1 a.m. Cloudy, then gradually becoming partly cloudy, with a low around 10. West wind 5 to 10 mph.

WEDNESDAY: Mostly sunny, very cold. with a high near 21.

WEDNESDAY NIGHT: Partly cloudy, with a low around 11.

THURSDAY: Partly sunny, with a high near 32.

THURSDAY NIGHT: Mostly cloudy, with a low around 20.

FRIDAY: Sunny, with a high near 33.

FRIDAY NIGHT: Mostly clear, with a low around 20.

SATURDAY: Sunny, with a high near 37.

SATURDAY NIGHT: Partly cloudy, with a low around 25.

SUNDAY: Mostly cloudy, with a high near 40.