Officially, the wettest day came May 15, when 1.63 inches of rain fell at Baltimore-Washington International Thurgood Marshall Airport, the region’s point of record.
But even heavier rain fell elsewhere around the region, of course — more than 10 inches was reported in Catonsville and 8 inches in Ellicott City on Sunday, causing devastating flooding.
The month’s weather was marked by a persistent pattern in which frontal boundaries remained draped over the region. That allowed tropical moisture to flow northward only to be wrung out over the mid-Atlantic.
Until this month, drought had been developing across parts of Maryland. Now, precipitation is running a couple inches ahead of normal, with 18.76 inches at BWI since January.
Climate forecasts for June show continued chances for wet weather. The U.S. Climate Prediction Center in College Park predicts as much as 50 percent chances of wetter-than-normal conditions (compared to an assumption of equal 33 percent chances of dry, normal or wet conditions).