High pressure sitting right over New Jersey this morning will provide for a tranquil and rather comfortable start to the week. However, by tomorrow a more tropical air mass will take hold and with it a threat for isolated showers and thunderstorms.
Today, high pressure will drift to the east of New Jersey leading to winds veering to the southwest at around 5 to 10 mph. An isolated shower is possible over western New Jersey due to a few passing disturbances, however most location will remain dry and comfortable. Temperatures will remain slightly below normal for this time of year with highs in the lower to mid 80's throughout the state.
Tonight, clouds will increase as a southwesterly wind at 5 to 10 mph transports more humidity into New Jersey from the Tennessee River Valley and the Gulf Coast. An isolated shower is possible but unlikely. Temperatures will fall into the lower to mid 60's for lows.
Tomorrow, scattered cloud cover is expected with a few isolated shower or thunderstorms in the afternoon, especially between 2 PM and 8 PM. Winds will be from the southwest at 5 to 15 mph. Temperatures will return to near normal levels with highs in the mid to upper 80's in the Delaware River Valley and mid 80's along the immediate coast. Overall, a nice day at the beach is expected.
A tropical air mass from the Gulf Coast will take hold throughout New Jersey by Wednesday as winds at all levels of the atmosphere will be from the southwest. With a more tropical air mass in place, widely scattered showers and strong to severe thunderstorms will be possible. The strongest thunderstorms will feature heavy downpours, frequent lightning, hail, and wind gusts over 60 mph. Wednesday will be the hottest day of the week with low temperatures in the upper 60's to lower 70's and high temperatures in the upper 80's to lower 90's over the Delaware River Valley and mid to upper 80's along the coast. The increase in humidity will support a heat index in the mid to upper 90's.
A powerful cold front will move through New Jersey on Thursday with widespread showers and strong to severe thunderstorms. The strongest thunderstorms will feature wind gusts over 60 mph, isolated tornadoes, hail, and very heavy downpours. Temperatures will range from the lower to mid 70's for lows and mid to upper 80's for highs.
Canadian high pressure will take hold for Friday on through Sunday with clear skies to scattered cloud cover. With a fresh Polar air mass, humidity will be very low through the period. Low temperatures will range from the upper 50's to lower 60's over the interior and lower to mid 60's along the coast. High temperatures will range from the lower to mid 80's throughout New Jersey.