The hazy, hot, and humid conditions in place throughout New Jersey will come to a very stormy end over the next 48 hours as a series of cold fronts and some residual moisture from Tropical Storm Arthur combine to create strong to severe thunderstorms along with periods of very heavy rainfall.
Today, the first of two cold fronts will approach New Jersey by this afternoon with showers and thunderstorms developing throughout the Garden State. These thunderstorms will be capable of reaching severe levels with very heavy downpours, frequent lightning, hail, and wind gusts over 60 mph. These thunderstorms will be capable of localized flash flooding and wind damage along with visibility below 2 miles. Winds will be from the southwest at 5 to 15 mph, increasing to 10 to 20 mph. Temperatures will rise into the upper 80's to lower 90's for highs but will fell like the upper 90's to mid 100's.
Tonight, the first cold front will stall over New Jersey producing widespread showers and thunderstorms with thunderstorms capable of very heavy downpours, wind gusts over 50 mph, and frequent lightning. The severe threat will start to transition to a heavy rain and flash flooding threat towards morning. Winds will be from the southwest at 10 to 20 mph. Temperatures will fall into the lower to mid 70's for lows.
Tomorrow, the second cold front will approach New Jersey and the East coast. This cold front will force Tropical Storm Arthur, which may be a hurricane at this point, out into the western Atlantic after approaching the Outer Banks of North Carolina. The combination of the cold front with moisture from Arthur will lead to widespread heavy rainfall with embedded thunderstorms. Localized flash and urban flooding can be expected. Winds will veer from the southwest to west at 10 to 20 mph. Temperatures will rise into the upper 80's to lower 90's.
On Friday, Fourth of July, the cold front will slowly push off the coast in the morning with lingering showers followed by clearing skies in the afternoon. Winds will veer to the northwest at 10 to 20 mph with gusts over 30 mph at times. Low temperatures will be in the lower to mid 70's. High temperatures will rise into the lower to mid 80's.
High pressure will take hold Friday night on through Tuesday with clear skies to scattered cloud cover. Low humidity will take hold through the period leading to very pleasant weather conditions for this long holiday weekend. Low temperatures will range from the lower to mid 60's. High temperatures will range from the mid to upper 80's.