Low pressure across the Mid-Atlantic region on the morning of the 17th in combination with east winds off the Atlantic Ocean produced showers and thunderstorms with very heavy rainfall. 47 inches at Washington Reagan National Airport.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LWX wrote it up.
Low pressure across the Mid-Atlantic region on the morning of the 17th in combination with east winds off the Atlantic Ocean produced showers and thunderstorms with very heavy rainfall. Rainfall totals included 2.50 inches at Cabin John, 2.10 inches at the Potomac Water Treatment Plant, and 1.47 inches at Washington Reagan National Airport. During the morning rush hour, Route 28 at Seneca Creek was closed by high water.
The Sterling radar (KLWX), 30 km away, was scanning. The volume nearest the first event began at 09:00 UTC.
1 flash flood. Local standard time, as filed.
Roads were closed by high water. Over 2 inches of rain fell in 12 hours.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2000Every state in 2000This day in weather historyWarnings in Maryland, April 2000
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5140921.