For much of Monday, rain remained steady yet drizzly. But twice downtown, the rainfall rate surged past an inch per hour, contributing to a one-day total of more than 3 inches -- nearly a month's worth of rain.
Rain was measured at the Inner Harbor in 12 out of the 24 hours of the day -- two of them combining for nearly all of the day's total.
From 3 p.m. to 4 p.m., 1.27 inches was measured there, according to a National Weather Service Gauge. Then, not to be outdone, 1.32 inches fell from 9 p.m. to 10 p.m., a span that helped push an Orioles rain delay just 9 minutes shy of the time it took for the game itself, according to WNST radio.
That made up a significant chunk of the 3.22 inches of rain measured throughout the day downtown.
Since records are kept at Baltimore-Washington International Thurgood Marshall Airport, it's difficult to compare the deluge to past rainfall events. The downtown total is nearly as much as BWI gets in an average June -- about 3.5 inches.
Baltimore's record rainfall for Monday's date is 2.33 inches, set at what was then Friendship Airport in 1951. Before that, the point of record for Baltimore weather was the U.S. Customs House, just a few blocks from the Inner Harbor.
Monday's rain came on top of more than 2 inches that fell in the Inner Harbor on Friday thanks to Tropical Storm Andrea.
At BWI, 1.8 inches of rain fell Monday, on top of 2.25 inches during Andrea. That pushes the year-to-date rainfall total above normal for the first time since February. So far this year, 18.77 inches of rain have fallen at BWI, less than an inch above normal. The rainfall gap had grown as large as 3-4 inches earlier this month.
The rain caused widespread flooding, according to reports received by the weather service. Interstate 695 was reported flooded at Frederick Road about 9:25 p.m., while the Route 1 business artery in Bel Air was closed for high water about 10:50 p.m.
Water was reported up to the hoods of cars in the 500 block of South Charles Street in Otterbein, according to the weather service.Copyright © 2015, The Baltimore Sun