The tropical air mass in place this morning has a limited shelf life as a cold front over the Great Lakes will drive through New Jersey tonight putting an end to the tropical air mass and introducing a fresh Polar air mass by tomorrow afternoon.
The cold front will approach through today with hazy skies and increasing cloud cover. A few isolated thunderstorms will develop ahead of the advancing cold front this afternoon. These thunderstorms will be capable of occasional lightning, heavy downpours, and wind gusts up to 50 mph. Winds will be from the southwest at 5 to 15 mph. Temperatures will rise into the mid to upper 80's along the coast and upper 80's to lower 90's in the Delaware River Valley. The heat index will push into the lower to mid 90's throughout the state due to the high levels of humidity.
The cold front will slowly move through New Jersey this evening through tomorrow morning. The bulk of the strongest thunderstorms will remain north of New Jersey, however a few thunderstorms will have the potential to reach severe levels with heavy downpours, frequent lightning, wind gusts over 60 mph, and hail. Otherwise, showers and thunderstorms will move through New Jersey starting after 6 PM and linger into the morning hours tomorrow over southern and central New Jersey. Winds will veer to the northwest at 5 to 15 mph. Temperatures will fall into the upper 60's to lower 70's for lows.
High pressure will build into the region by tomorrow afternoon with clearing skies, lower humidity, and winds from the northwest at 5 to 15 mph, gusting to 20 mph at times. Temperatures tomorrow afternoon will rise into the lower to mid 80's for highs.
High pressure will remain in control Friday on through Sunday with tranquil and dry conditions. Clouds will increase on Sunday afternoon and evening ahead of an advancing area of low pressure. Temperatures on Friday will range from the upper 50's to lower 60's for lows and lower to mid 80's for highs. Temperatures on Saturday will be slightly warmer with lows in the lower to mid 60's for lows and mid 80's for highs. On Sunday, temperatures will return to near normal levels with lows in the mid to upper 60's and highs in the mid to upper 80's.
An area of low pressure with a series of disturbances will move through New Jersey on Monday and Tuesday with scattered showers and isolated thunderstorms. A new unsettled air mass will take hold with lows in the upper 50's to lower 60's and highs in the lower to mid 80's.