High pressure over the eastern Great Lakes will provide excellent weather conditions for the entire Philadelphia and New York City metropolitan areas for this Memorial Day with warm temperatures and low humidity. However, as high pressure shifts off the coast, a hot and humid summer pattern takes hold just in time for the end of May and start of June!
High pressure will produce clear skies and winds from the northwest at 5 to 15 mph through this evening. Low humidity can be expected with temperatures rising into the lower to mid 70’s along the coast and mid to upper 70’s elsewhere for highs this afternoon.
Pleasant weather conditions will continue overnight with winds shifting to the south at 5 to 10 mph. Temperatures will fall into the upper 40’s to lower 50’s over the interior and mid to upper 50’s along the coast for lows.
Clouds will increase through the day tomorrow as a warm front approaches from the southwest. Winds will be from the south and southeast at 5 to 10 mph. Temperatures will rise into the upper 60’s to lower 70’s over Long Island, lower 70’s along the New Jersey and Connecticut coasts, and lower to mid 70’s over the rest of the region.
A warm front will move through the Philadelphia and New York City metropolitan areas on Wednesday with showers and thunderstorms. The thunderstorms may reach severe levels with heavy downpours, wind gusts over 50 mph, hail, and frequent lightning. The timing of the warm front will be a key factor in temperatures on Wednesday. Low temperatures will range from the lower to mid 60’s throughout the region. High temperatures will range from the mid to upper 70’s over Connecticut, lower to mid 70’s along the immediate coast, and upper 70’s to mid 80’s over the Delaware River Valley. The faster the warm front moves through, the more likely all locations warm into the upper 70’s to mid 80’s.
Thereafter, a Bermuda high pressure pattern will take hold with a southwesterly wind at all levels of the atmosphere. Humidity will increase along with temperatures pushing to well above normal levels. Fog may develop in the morning hours and become locally dense. Scattered clouds are expected but I can’t rule out an afternoon or evening rogue thunderstorm. Low temperatures will range from the lower to mid 60’s over the interior and mid to upper 60’s along the coast. High temperatures will range from the lower to mid 80’s over Long Island, mid to upper 80’s along the New Jersey and Connecticut coast, and upper 80’s to lower 90’s elsewhere, especially in the Delaware River Valley.