Another hazy, hot, and humid summer day is on the way with a threat for thunderstorms. Looks like the weekend will feature much of the same!
A tropical air mass has returned to the Philadelphia and New York City metropolitan areas with plenty of moisture in the atmosphere. As a result, areas of locally dense fog and low clouds have developed throughout the region. The fog will give way to scattered cloud cover by this afternoon as temperatures rise into the upper 80's to mid 90's for highs this afternoon. The hottest locations will be over the Delaware River Valley and Philadelphia metropolitan area where the heat index will approach 100 degrees.
With the hazy, hot and humid conditions, thunderstorms will be a threat this afternoon and for much of the weekend. While the thunderstorms will be isolated to widely scattered in coverage, the thunderstorms will be capable of very heavy downpours, frequent lightning, strong wind gusts over 40 mph, and hail. While most locations will miss out on these thunderstorms, locations impacted can expect localized flash flooding, wind damage, and very poor visibility in the thunderstorms. Fog will also be a constant threat each morning through this weekend with visibility falling below a mile in some locations. Temperatures will range from the upper 60s to mid 70s for lows and upper 80s to mid 90s for highs.
A strong cold front will move through the region on Monday with widespread showers and strong to severe thunderstorms. The thunderstorms will be capable of wind gusts over 50 mph, heavy downpours, large hail, and frequent lightning. Temperatures on Monday will range from the upper 60's to lower 70s for lows and upper 80s to lower 90s for highs.
High pressure will take hold for Tuesday on through the end of next week with tranquil weather conditions and low levels of humidity. Scattered cloud cover along with light and variable winds can be expected. Temperatures will range from the lower to mid 60's for lows and mid to upper 80's for highs.