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Flooded areas of North Baton Rouge from the air in August 2016.

Recent rains across south Louisiana have brought welcome relief from summer heat, and they’ve been a blessing for local yards, gardens and farms, too.

But as area residents know all too well, too much rain can be an agony of epic proportions. The Great Flood of 2016, which ravaged the Baton Rouge region, was caused by an unnamed tropical system that hung around for days, dumping inch after inch on a region that simply couldn’t handle so much water all at once. Hurricane Harvey, which hovered over Houston in a similar way last year, was another huge disaster.

That’s why a new study just published in the science journal Nature is so troubling. It concluded that big tropical storms are generally moving slower over land than they have in the past, which means more rain in a given area.

A single study can’t be viewed as conclusive, and this issue is obviously something that scientists are going to have to consider more closely. But if the trend proves correct, then communities like those across south Louisiana are going to have to do a better job with flood control systems and development policies. The stability of the federal flood insurance program, which is already challenged, could be in for greater strain, too.

The possibility of slower-moving storms is something Louisiana residents will have to monitor. As we’ve learned the hard way, just one mammoth rain-maker can mean misery for thousands.