After a beautiful weekend in Philadelphia, a bout of drenching rain and thunderstorms will continue into Tuesday night which will lead to a threat for flash and urban flooding.
Downpours will remain widespread into the evening before tapering off to showers overnight.
The evening commute Tuesday could be very difficult. Commuters may even have to dodge some detours around any localized flooding problems that develop.
A shower can linger Wednesday morning drier air builds in along with a mixture of clouds and sunshine Wednesday afternoon.
Cooler and less humid air will follow for Thursday and Friday with high temperatures well below normal, in the upper 70s.
A tropical wave is likely to become the Atlantic Basin's next tropical storm as it approaches or crosses the Caribbean Sea later this week.
Bouts of wet weather will soak the northeastern United States during the last full week of September.
Typhoon Megi will threaten lives and property across Taiwan and eastern China into the middle of the week.
Gusty winds will accompany a push of chilly air across the Great Lakes through Tuesday.
The final day of September will bring a rare lunar event that hasn’t occurred since March of 2014, a Black Moon.
Following some rain and gusty winds on Tuesday, a strong storm will target the United Kingdom on Thursday.
Langley AFB, VA (1993)
Wind gusts of 111 mph.
New England (1816)
"Black Frost" over all New England killed still unripened corn.
Georgetown, GA (1822)
Hurricane killed 125 people.