A cold front passing through Thursday will push the high...

A cold front passing through Thursday will push the high of 41 degrees down to 19 degrees.

Bundle up — a cold blast is coming this way, this season's chilliest so far. 

Long Island will see the mercury plunge tonight, with temperatures dropping 15 to 20 degrees below normal for this time of year, according to the National Weather Service.

A cold front passing through this afternoon will push Thursday’s high of 41 degrees down to 19 degrees by early Friday morning.

Even Thursday’s day temperatures are several degrees cooler than average, with wind chill values making it feel more like 25 to 30 degrees.

“It’s the coldest air of the season so far, and tonight as temperatures do drop, if it's still going to be windy the first half of tonight, we're going to have wind chills that might get down into the single digits,” said James Tomasini, a meteorologist with the service in Upton.

Wind gusts are expected to go up to 30 to 35 mph, he said. 

The region could even see some record low temperatures, according to the service.

Friday will feature partly sunny skies and a high of 37 degrees, with a slight chance of light snow after 4 p.m. that is expected to turn to rain.

Tomasini said the weekend will see slightly warmer temperatures, with day temperatures in the low 40s Saturday and Sunday. Evening temperatures on Saturday will fall to 29 and 23 on Sunday.

Another cold front on Sunday night will bring cold temperatures that will linger until Tuesday. Monday is expected to be in the high 30s with lows in the teens, according to the service.

What began as a desperate hunt for Shannan Gilbert in the marshes near Gilgo Beach became, in three astonishing days in December 2010, the unmasking of a possible serial killer. NewsdayTV's Doug Geed has more.  Credit: Newsday/A. J. Singh; File Footage; Photo Credit: SCPD

'We had absolutely no idea what happened to her' What began as a desperate hunt for Shannan Gilbert in the marshes near Gilgo Beach became, in three astonishing days in December 2010, the unmasking of a possible serial killer. NewsdayTV's Doug Geed has more.

What began as a desperate hunt for Shannan Gilbert in the marshes near Gilgo Beach became, in three astonishing days in December 2010, the unmasking of a possible serial killer. NewsdayTV's Doug Geed has more.  Credit: Newsday/A. J. Singh; File Footage; Photo Credit: SCPD

'We had absolutely no idea what happened to her' What began as a desperate hunt for Shannan Gilbert in the marshes near Gilgo Beach became, in three astonishing days in December 2010, the unmasking of a possible serial killer. NewsdayTV's Doug Geed has more.

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