In less than a week, there were at least four 1-in-1,000-year rainfall events across the United States — intense deluges that are thought to have roughly a 0.1% chance of happening in any given year.

The chance of rain will decrease through the evening on Friday in the Philadelphia region as temperatures once again gradually drop back into the low 70s to start off the weekend.

The city used its Flood Early Warning System to target hotspots and install signs warning of potential high water during storms, including one near Rose Lane. The city intentionally lowered the water level at Lake Johnson to help collect storm runoff downstream ahead of Debbie’s arrival.

Severe thunderstorms will head east by Saturday, impacting eastern Michigan and parts of northern Indiana. One to two inches of rain is possible as the system tracks east, but some areas could see isolated amounts of three to five inches through the weekend.

Scattered showers and storms are possible on Friday with pockets of heavy rain and gusty winds. The forecast high Friday in the Twin Cities is 85 degrees, with a mix of sun and clouds. The greatest chance for storms comes in the evening hours with flooding being the main concern.

Saturday night: A chance of showers and thunderstorms. Partly cloudy, with a low of around 73. Southwest wind around 6 mph, becoming calm in the evening. The chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts are possible in thunderstorms.

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Thousands of people were in the path of a dangerous storm that moved through North Carolina on Wednesday afternoon.

The primary reason for the slight decrease is because of stronger levels of wind shear expected in the Caribbean, according to the report. Wind shear, which is a change in wind speed or direction,

Showers and thunderstorms are expected to develop Friday afternoon and evening, with the strongest activity likely across northern Lower Michigan. The National Weather Service has indicated a marginal risk of severe storms, with potential for heavy downpours and localized flooding.

Scientists agree that a warmer atmosphere will mean more intense storms. And North Carolina is expected to warm by 2 to 4 degrees in the next 25 years.