Axios

Flash flooding from a massive rainstorm rushed through Main Street on Sunday in Ellicott City, Md., which was severely ravaged by flood waters just two years ago.

Why it matters: Sunday's and 2016 flooding likely rank as greater than 1-in-1,000 year rainstorms, which means than in any given year there's just a 0.1 percent chance of them occurring, Axios science editor Andrew Freedman explains. By adding more moisture to the air available for storms, climate change is leading to a well-documented uptick in heavy rain events, particularly in the Northeast. Human development patterns are also elevating flood risk in many areas.

The average gas price nationwide is at almost $3 a gallon — the highest it's been in four years — and for those planning summer road trips, here are the states to avoid if you're looking for cheap gasoline.

Between the lines: Axios' energy reporter Amy Harder explains that while there is evidence that President Trump is at least a partial contributor to the rise in gas prices, other factors such as OPEC and Russia, which decided to cut oil production this year, and varying state taxes also have impacted prices.