Flood — Lebanon, Pennsylvania

2025-07-01 · near Cornwall, Lebanon, Pennsylvania

Event narrative

Flooding on PA 72 in both directions at Horseshoe Pike.

Wider weather episode

A slow-moving warm front in an extremely moist (PWAT values exceeding 2.00, values closer to 2.25 across the Lower Susquehanna Valley) and unstable environment allowed for multiple clusters of thunderstorms to begin to form during the late morning hours and continue through the late evening hours of June 30, 2025. A shortwave stationed across the region allowed for enhanced lift, with relatively weak shear in place across the region, bringing a flash flood threat given training thunderstorms with efficient rainfall rates in excess of two inches per hour across southern Pennsylvania. Multiple rounds of thunderstorms during the afternoon and evening hours across Lancaster County, where multiple days of heavy rainfall led to low flash flood guidance, prompted widespread flash flooding across the northern half of the county, with multiple water rescues reported in Mount Joy and Manheim. Multiple roadways were closed across northern Lancaster County and southern Lebanon County due to heavy rain, with isolated instances of flash flooding in Cumberland County. Flooding concerns in Lancaster County continued into the early morning hours of July 1, 2025 as the heaviest rain began to move out of the area.

View location on OpenStreetMap → (40.2558, -76.4319)

Source: NOAA Storm Events Database, event_id 1278545. Narrative written by the NWS forecast office that issued the report.