FloodZoneMap.org

A vigorous upper-level disturbance acted upon increasingly warm and humid air near the surface to produce a squall line of strong to severe thunderstorms which traversed central and northeastern Maryland during the afternoon. Overall, damage was dominated by numerous downed trees, large limbs, and power lines, though there were scattered occurrences of large hail.Montgomery Co was hardest hit. Though no one area received major damage, nearly all communities in the eastern two-thirds of the cou