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Early Fall like air mass settles in to end the week

A cool Polar air mass has invaded New Jersey with temperatures well below normal.
A cool Polar air mass has invaded New Jersey with temperatures well below normal.
NWS/NOAA

A very cool Polar air mass has invaded New Jersey this morning and temperatures through at least Saturday morning will resemble more like mid September temperatures than mid August. Granted, this Summer has not exactly been warm, but still these temperatures on the way tonight and tomorrow night are impressive none the less.

A weak cold front will move through New Jersey this afternoon with scattered clouds and possibly an isolated shower. Most locations will remain dry though with winds from the west to northwest at 5 to 15 mph. Temperatures will rise into the lower to mid 70's over northwestern New Jersey and mid to upper 70's throughout the rest of New Jersey for highs this afternoon. Normal temperatures typically are in the mid 80's for this time of year.

Tonight, high pressure will take complete control with clear skies, light winds, and very dry air. This is a perfect combination to allow temperatures to crash into the 40's and 50's, which is exactly what will happen. Low temperatures will range from the mid to upper 40's in northwestern New Jersey, lower to mid 50's for the western suburbs of New York City, and mid to upper 50's for the rest of central and southern New Jersey.

High pressure will remain in control for tomorrow on through Saturday with clear skies to scattered cloud cover expected. Winds will back from the northwest to west at 5 to 15 mph. Temperatures tomorrow will rise into the lower to mid 70's over northwestern New Jersey and mid to upper 70's throughout the rest of New Jersey. Temperatures on Saturday morning will range from the mid to upper 40's over northwestern New Jersey and lower to mid 50's over the rest of New Jersey. Temperatures by Saturday afternoon will rebound into the lower to mid 80's over much of New Jersey, upper 70's to lower 80's along the immediate coast. I should note that normal temperatures in this time period range from the mid 60's for lows and mid to upper 80's for highs in mid August, so as you can see this is a rather chilly air mass.

A cold front will move through New Jersey on Sunday with widely scattered showers and isolated thunderstorms. Winds will back to the southwest at 5 to 15 mph ahead of the cold front passage and then veer back to the northwest on Sunday evening. Temperatures will range from the lower to mid 60's for lows and mid to upper 80's for highs.

High pressure will be in control on Monday with scattered cloud cover expected. The high pressure system will shift towards the New England coastal waters by Tuesday with clouds increasing as an area of low pressure approaches from the Tennessee River Valley. Temperatures will be near normal with lows in the mid to upper 60's and highs in the lower to mid 80's.

An area of low pressure will move through New Jersey and south of Long Island on Wednesday with periods of rain expected. The rain will be heavy at times and localized flash flooding will be a concern once again. Temperatures will range from the mid to upper 60's for lows and upper 70's to lower 80's for highs.