This month's rainfall is two-hundredths of an inch shy of 10 inches, but it's already enough to break a record dating to Hurricane Agnes in 1972. And heavy rain is forecast this weekend, with a flood watch in effect.
Showers that passed through Thursday night brought the monthly rainfall total at Baltimore-Washington International Thurgood Marshall Airport, the region's point of record, to 9.98 inches. That is three-hundredths of an inch more than what fell in June 1972.
Agnes dropped more than 6 inches at BWI over two days, from June 21-22, 1972, setting rainfall records for both days. Its floodwaters killed 19 people in Maryland, including three children trapped in a car at Ruxton and Falls roads and a Parkton man found drowned under the old York Road underpass in Cockeysville.
This month's rain has been spread throughout the month. The heaviest rain fell at the start of the month, with 2.5 inches June 1. Since then, more than an inch of rain has fallen on three days this month, and more than half an inch fell two other days.
Eleven days in all have seen at least a tenth of an inch of rain at BWI this month.
The month's rain gauge appears certain to surpass 10 inches, with heavy rain and storms expected Saturday into Saturday night. A flash flood watch is in effect from Friday night through Saturday night, with 1-3 inches of rain expected.