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The maximum frost depth observed in the contiguous United States ranges from 0 to 8 feet (2.4 m). [1] Below that depth, the temperature varies, but is always above 0 °C (32 °F). Alternatively, in Arctic and Antarctic locations the freezing depth is so deep that it becomes year-round permafrost , and the term " thaw depth " is used instead.
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 increased use of other roofing materials, especially asphalt shingles, resulted in reduced demand for slate. Many quarries also removed all of the easily extractable slate present. A final factor to the industry's decline was the Great Depression, which resulted in greatly reduced home constructions that represented the market for slate ...
The Snowbelt, Snow Belt, Frostbelt, or Frost Belt [1] is the region near the Great Lakes in North America where heavy snowfall in the form of lake-effect snow is particularly common. [2] Snowbelts are typically found downwind of the lakes, principally off the eastern and southern shores.
The climate of Allentown, Pennsylvania is classified as a humid continental climate (Köppen Dfa). Allentown's warmest month (on average) is July with a daily average temperature of 74.7 °F (23.7 °C) and the coldest month (on average) being January with a daily average of 29.4 °F (−1.4 °C).
Most frost quakes are associated with minor snow cover on the ground without a significant amount of snow to insulate the ground (i.e., less than 6 inches (15 cm)) A rapid temperature drop from approximately freezing to near or below −18 °C (0 °F), which ordinarily occurred on a timescale of 16 to 48 hours.
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The top plate illustrates the tectonic setting for the sediments of Pennsylvania. This section is characterized by the metamorphic rocks that provide much of the bedrock for this area. The oldest exposed rocks in Pennsylvania are found here and consist of the Baltimore Gneiss. [8] These rocks have a complex history and a vast array of different ...