2,274 first-hand accounts of flood events in Pennsylvania, ranked by impact. Each is a NOAA-written narrative of the moment.
A weak trough and remnant outflows initiated afternoon thunderstorms. Initial single cell development across eastern Ohio ultimately congealed along propagating cold pools and surged southeast.
Read the full account →Slow-moving thunderstorms produced between 2.5 and 3 inches of rainfall over extreme northeast Fayette and southwest Westmoreland Counties in just under two hours.
Read the full account →Heavy rainfall spread into northern Pennsylvania as an intense area of low pressure tracked from southern Indiana Tuesday morning on the 17th to northeast of Lake Huron on the morning of the 18th and through eastern Canada Wednesday afternoon and evening.
Read the full account →Tropical moisture continued to stream northward into eastern Pennsylvania ahead of a frontal system which slowly moved westward into the eastern Great Lakes by Tuesday morning the 27th.
Read the full account →Tropical moisture continued to stream northward into eastern Pennsylvania ahead of a frontal system which slowly moved westward into the eastern Great Lakes by Tuesday morning the 27th.
Read the full account →A strong low pressure system tracked northeast from Kentucky to western New York state during the daylight hours on Thursday the 16th. A large fetch of Gulf and Atlantic moisture was pulled northward ahead of the cold front, which produced a squall line of thunderstorms.
Read the full account →A series of shortwaves diving through a broad upper level trough brought rounds of showers and thunderstorms through the last several days of June.
Read the full account →A series of shortwaves diving through a broad upper level trough brought rounds of showers and thunderstorms through the last several days of June.
Read the full account →The combination of snowmelt from the previous week's two storms, unseasonably warm temperatures and an additional one to two inches of rain caused the flash flooding of almost every small stream and significant roadway flooding the afternoon and early evening hours on the 19th.
Read the full account →Mild temperatures starting on the 15th caused winter snow to melt. Overnight temperatures mainly in the 20s and 30s slowed the snowmelt down each night. The larger rivers began rising on the 17th.
Read the full account →Mild temperatures starting on the 15th caused winter snow to melt. Overnight temperatures mainly in the 20s and 30s slowed the snowmelt down each night. The larger rivers began rising on the 17th.
Read the full account →A cold front associated with a surface low pressure system centered over Lake Superior approached the region late Tuesday, November 30th. Abundant moisture and temperatures above freezing ahead of the cold front allowed for most of the precipitation to fall as heavy rain.
Read the full account →A cold front associated with a surface low pressure system centered over Lake Superior approached the region late Tuesday, November 30th. Abundant moisture and temperatures above freezing ahead of the cold front allowed for most of the precipitation to fall as heavy rain.
Read the full account →A series of low pressure systems that moved north along a slowly moving cold front brought heavy rain into Eastern Pennsylvania on September 30th and October 1st. Event precipitation totals average 5 to 10 inches with the highest amounts in the Philadelphia western suburbs.
Read the full account →A series of low pressure systems that moved north along a slowly moving cold front brought heavy rain into Eastern Pennsylvania on September 30th and October 1st. Event precipitation totals average 5 to 10 inches with the highest amounts in the Philadelphia western suburbs.
Read the full account →A thunderstorm complex that developed in conjunction with a strengthening surface low over northern Indiana propagated westward towards the region late on the 12th.
Read the full account →A thunderstorm complex that developed in conjunction with a strengthening surface low over northern Indiana propagated westward towards the region late on the 12th.
Read the full account →A thunderstorm complex that developed in conjunction with a strengthening surface low over northern Indiana propagated westward towards the region late on the 12th.
Read the full account →A thunderstorm complex that developed in conjunction with a strengthening surface low over northern Indiana propagated westward towards the region late on the 12th.
Read the full account →A thunderstorm complex that developed in conjunction with a strengthening surface low over northern Indiana propagated westward towards the region late on the 12th.
Read the full account →An outflow boundary situated over interstate 80 became the focus for thunderstorm development as several upper level disturbances rounded a flattening ridge over the plains.
Read the full account →An outflow boundary situated over interstate 80 became the focus for thunderstorm development as several upper level disturbances rounded a flattening ridge over the plains.
Read the full account →The combination of an approaching cold front and tropical moisture that moved into the region from a decaying low pressure system over the Carolinas produced heavy rain over Eastern Pennsylvania between 6 a.m. EDT and 6 p.m. EDT on the 28th.
Read the full account →A tornadic storm moved through Union City on the evening of the 28th. Heavy rain accompanied this storm with a 15 minute ASOS rain gage reading of 0.65. The storm total rain the river basin that Union City resides in was approximately 4.
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