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Tropical cyclones normally threaten the states during the summer and fall, with their main impact being rainfall. [3] Although Hurricane Agnes was barely a hurricane at landfall in Florida, its major impact was over the Mid-Atlantic region, where Agnes combined with a non-tropical low to produce widespread rains of 6 inches (150 mm) to 12 inches (300 mm) with local amounts up to 19 inches (480 ...
The Johnstown Flood was the worst flood to hit the U.S. in the 19th century, and to date, the worst to strike Pennsylvania. [ 27 ] 1,600 homes were destroyed, $17 million in property damage levied (approx. $550 million in 2022), and 4 square miles (10 km 2 ) of downtown Johnstown were completely destroyed.
The Johnstown flood of 1977 was a major flood which began on the night of July 19, 1977, when heavy rainfall caused widespread flash flooding in Cambria County, Pennsylvania, United States, including the city of Johnstown and the Conemaugh Valley. On July 19, a deluge of rain hit the Johnstown area during the night.
The worst flooding in the state took place in the Susquehanna River valley and its tributaries. Over 200,000 residents in northeastern Pennsylvania had to be evacuated due to the rising floodwaters. Damage in Susquehanna County alone totaled over $100 million (equivalent to more than $145 million in 2023).
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Average annual precipitation in Pennsylvania has increased 5 to 10 percent in the last century, and precipitation from extremely heavy storms has increased 70 percent in the Northeast since 1958. Wildfire smoke pollution, Delaware River, 2023. During the next century, annual precipitation and the frequency of heavy downpours are likely to keep ...
The state’s uninsured rate is at 8.8%, well below the national average of 13.8%. The average household income is $70,979, over $10,000 more than the national average.
The storms brought warmer weather with temperatures of 50 °F (10 °C) and was a cause of one stage of the flooding; the continuous rainfall was the second cause. The natural surface runoff of 1 to 3 inches (2.5 to 7.5 cm) was far surpassed by the deluge of from 10 to 30 inches (25 to 75 cm) of water in the region.