2,274 first-hand accounts of flood events in Pennsylvania, ranked by impact. Each is a NOAA-written narrative of the moment.
Heavy rain with little, if any, lightning moved along a stationary front in a tropical environment. Moisture was plentiful, with precipitable water values of over 2 inches.
Read the full account →A frontal boundary, coupled with an extremely warm and humid environment, produced another day of slow moving, torrential downpour producing thunderstorms over Northeast Pennsylvania. Stripes of 1 to 3 inch rainfall occurred over several parts of the area.
Read the full account →The remnant low pressure center of Hurricane Ida passed across West Virginia and the Central Appalachian Mountains from late August 31st through September 1st.
Read the full account →Several rounds of showers and thunderstorms prompted a widespread flash flood problems across the Ohio River Valley on April 2nd to April 3rd.
Read the full account →Several rounds of showers and thunderstorms prompted a widespread flash flood problems across the Ohio River Valley on April 2nd to April 3rd.
Read the full account →Several rounds of showers and thunderstorms prompted a widespread flash flood problems across the Ohio River Valley on April 2nd to April 3rd.
Read the full account →A deep plume of tropical moisture had spread over Northeast Pennsylvania ahead of the remnants of Tropical Storm Debby. Prolonged torrential rains blanketed the region during the night and early morning hours before becoming enhanced by the approaching tropical remnants.
Read the full account →A deep plume of tropical moisture had spread over Northeast Pennsylvania ahead of the remnants of Tropical Storm Debby. Prolonged torrential rains blanketed the region during the night and early morning hours before becoming enhanced by the approaching tropical remnants.
Read the full account →This day, May 17th, will be remembered as one of the more unusual tornado days in southwest Pennsylvania. Although overall levels of instability were fairly low, enough of that parameter, plus shear, was concentrated in the 0 to 3 km layer to allow for the formation of…
Read the full account →A deep stream of moisture was pulled northwestward from the Atlantic Ocean into the mountains of south-central Pennsylvania around an upper level low centered over the Ohio Valley during the afternoon and evening hours of May 13. 2025.
Read the full account →A deep stream of moisture was pulled northwestward from the Atlantic Ocean into the mountains of south-central Pennsylvania around an upper level low centered over the Ohio Valley during the afternoon and evening hours of May 13. 2025.
Read the full account →A deep stream of moisture was pulled northwestward from the Atlantic Ocean into the mountains of south-central Pennsylvania around an upper level low centered over the Ohio Valley during the afternoon and evening hours of May 13. 2025.
Read the full account →Lake Erie broke another record high monthly mean in April 2020. April average water levels reached 574.31 feet, which was above the long term record of 574.08 feet in 1985. The lake levels peaked at 574.40 feet on the 8th and 11th.
Read the full account →Several rounds of thunderstorms trained over portions of Lawrence, Allegheny, Westmoreland Clarion and Beaver counties on June 6th. This was a result of a very moist airmass and a stationary boundary located over northern Ohio and northwestern Pennsylvania.
Read the full account →A warm, moist airmass remained in place through the latter half of the month which allowed for daily shower and thunderstorm chances. Training storms was the primary factor to the resultant flash flooding as cells developed upshear of the initial updrafts in West Virginia, Ohio,…
Read the full account →Ample moisture and a near-stationary boundary assisted in the development of slow moving thunderstorms late on June 14th. Precipitable water values exceeding 90% of climatology, which supported efficient rainfall.
Read the full account →Ample moisture and a near-stationary boundary assisted in the development of slow moving thunderstorms late on June 14th. Precipitable water values exceeding 90% of climatology, which supported efficient rainfall.
Read the full account →Ample moisture and a near-stationary boundary assisted in the development of slow moving thunderstorms late on June 14th. Precipitable water values exceeding 90% of climatology, which supported efficient rainfall.
Read the full account →A deep plume of tropical moisture had spread over Northeast Pennsylvania ahead of the remnants of Tropical Storm Debby. Prolonged torrential rains blanketed the region during the night and early morning hours before becoming enhanced by the approaching tropical remnants.
Read the full account →Multiple rounds of thunderstorms, first from a decaying morning mesoscale convective system and later forming on outflow from earlier activity, produced heavy rainfall on July 1st.
Read the full account →A weak frontal system moving through a warm and excessively moist environment triggered thunderstorms with torrential rainfall. These storms were slow moving and produced copious amounts of rain which led to localized flash flooding of roads, small streams and a few residences…
Read the full account →A weak frontal system moving through a warm and excessively moist environment triggered thunderstorms with torrential rainfall. These storms were slow moving and produced copious amounts of rain which led to localized flash flooding of roads, small streams and a few residences…
Read the full account →A frontal boundary, coupled with an extremely warm and humid environment, produced another day of slow moving, torrential downpour producing thunderstorms over Northeast Pennsylvania. Stripes of 1 to 3 inch rainfall occurred over several parts of the area.
Read the full account →Several rounds of thunderstorms trained over portions of Lawrence, Allegheny, Westmoreland Clarion and Beaver counties on June 6th. This was a result of a very moist airmass and a stationary boundary located over northern Ohio and northwestern Pennsylvania.
Read the full account →