2,274 first-hand accounts of flood events in Pennsylvania, ranked by impact. Each is a NOAA-written narrative of the moment.
A shortwave trough, moving through an unstable and extremely moist air mass (PWATs over 2.00) over central Pennsylvania, allowed for showers and thunderstorms to develop across the area during the afternoon hours of July 13, 2025.
Read the full account →Upper level low pressure was situated over the Middle Ohio Valley on May 4th. Spokes of mid-level vorticity rotating around the low supported the development of showers and thunderstorms.
Read the full account →A shortwave trough, moving through an unstable and extremely moist air mass (PWATs over 2.00) over central Pennsylvania, allowed for showers and thunderstorms to develop across the area during the afternoon hours of July 13, 2025.
Read the full account →A surface cold front was stationed near the Mason-Dixon line, with an area of surface low pressure developing and tracking across southern portions of central Pennsylvania.
Read the full account →A surface cold front was stationed near the Mason-Dixon line, with an area of surface low pressure developing and tracking across southern portions of central Pennsylvania.
Read the full account →A surface cold front was stationed near the Mason-Dixon line, with an area of surface low pressure developing and tracking across southern portions of central Pennsylvania.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A cold front stationed across west-central Pennsylvania began traversing eastward across the area during the afternoon hours of July 1, 2025. Ample instability and moisture ahead of the frontal passage allowed for showers and thunderstorms to develop, with thunderstorms…
Read the full account →A cold front stationed across west-central Pennsylvania began traversing eastward across the area during the afternoon hours of July 1, 2025. Ample instability and moisture ahead of the frontal passage allowed for showers and thunderstorms to develop, with thunderstorms…
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →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…
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →A fairly moist and unstable environment ahead of a shortwave trough allowed for showers and thunderstorms to begin forming across central Pennsylvania during the morning hours of July 14, 2025.
Read the full account →Overnight sub-severe convection and remnant boundaries from said convection acted as initiating mechanisms for development later in the morning and afternoon hours.
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