2,274 first-hand accounts of flood events in Pennsylvania, ranked by impact. Each is a NOAA-written narrative of the moment.
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 →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 →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 →Deep moisture combined with an approaching cold front and a favorable position of the jet stream triggered numerous heavy rain producing thunderstorms over northeastern Pennsylvania.
Read the full account →Slow moving pulse storms created flash flooding conditions across the region. The storms developed in a very moist, buoyant environment where 2000-3000 J/kg SBCAPE and 1.7-1.9 inch PW values, supported very efficient rainfall rates.
Read the full account →Slow moving pulse storms created flash flooding conditions across the region. The storms developed in a very moist, buoyant environment where 2000-3000 J/kg SBCAPE and 1.7-1.9 inch PW values, supported very efficient rainfall rates.
Read the full account →A complex storm system moved from the Lower Mississippi valley to lower Ontario during this time period. Warm and moist air surged northward from the Gulf of Mexico bringing rain and temperatures in the lower 50s.
Read the full account →Additional heavy rain fell Tuesday afternoon into Wednesday morning across Wyoming County on top of what fell earlier on Tuesday the 27th as a front moved east across Pennsylvania and combined with low pressure and tropical moisture.
Read the full account →A slow moving upper level low pressure system interacted with a surface frontal boundary to induce torrential rain producing thunderstorms. These storms moved into Northeast Pennsylvania during the afternoon and repeatedly struck the same areas leading to localized flash…
Read the full account →Storms developed the afternoon of the 13th as a result of a passing shortwave to the south and a slow moving trough located north of the Great Lakes. Just like the previous day, despite the fact that effective shear was slightly weak, DCAPE was ranging between 900 to 1000 J/kg.
Read the full account →A stationary front poised in the vicinity of central New York and northeast Pennsylvania was the focus for very warm and moist atmospheric conditions across the region.
Read the full account →A weak area of low pressure moved into Northeastern Pennsylvania during the afternoon which provided a focus for heavy rain-producing thunderstorms.
Read the full account →High CAPE (>2500 J/kg) and strong speed and directional shear contributed to a significant severe weather episode across south-central Pennsylvania during the afternoon and evening of August 7, 2023.
Read the full account →Tropical moisture streamed northward into northeast Pennsylvania ahead of a frontal system which slowly moved westward into the eastern Great Lakes by Tuesday morning the 27th.
Read the full account →Hurricane Irene brought heavy rains and high winds from northeast Pennsylvania to the Catskill Mountains of New York from Saturday evening the 27th to Sunday afternoon the 28th.
Read the full account →Low pressure moved north along the Atlantic Seaboard spreading steady and heavy rain into northeastern Pennsylvania during the overnight hours. Rainfall amounts of 2 to 4 inches were observed along with a considerable amount of melting snow into area rivers and streams.
Read the full account →An advancing warm front promoted heavy rain and thunderstorms during the afternoon of March 28th. Substantial breaks in the clouds south of the boundary, along with substantial warm air advection, resulted in around 1500 J/kg of mean-layer CAPE, and substantial (60kts+)…
Read the full account →A mid-level shortwave trough moved across the northern Great Lakes with a belt of stronger flow moving through the southern Great Lakes. Scattered thunderstorms|developed through midday into the afternoon. Forecast soundings showed some low-level hodograph curvature.
Read the full account →Stationary boundary and near climatological max precpitable water led to another round of showers and thunderstorms with very heavy rainfall on the 15th.
Read the full account →Stationary boundary and near climatological max precpitable water led to another round of showers and thunderstorms with very heavy rainfall on the 15th.
Read the full account →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 cold front moved south across northern Ohio and northwest Pennsylvania on the evening of the 1st. The environment lacked shear and instability keeping the risk of severe weather low.
Read the full account →On July 16th, a weak positively-tilted trough tracked from the Mississippi River Valley towards the Great Lakes today, while a surface front slowly sagged south from Lake Erie.
Read the full account →On July 16th, a weak positively-tilted trough tracked from the Mississippi River Valley towards the Great Lakes today, while a surface front slowly sagged south from Lake Erie.
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