Philadelphia got a reported 15 inches (38 cm) and New York City 2 feet (61 cm) of snow. 1851 to 1900
Plains Blizzard of 1856. December 3–5, 1856. Severe blizzard-like storm raged for three days in Kansas and Iowa. Early pioneers suffered. "The Cold Storm of 1857" January 18–19, 1857. Produced severe blizzard conditions from North Carolina to Maine. Heavy snowfalls reported in east coast cities. Midwest Blizzard of 1864. January 1, 1864. Gale-force winds, driving snow, and low temperatures all struck simultaneously around Chicago, Wisconsin and Minnesota. Plains Blizzard of 1873. January 7, 1873. Severe blizzard struck the Great Plains. Many pioneers from the east were unprepared for the storm and perished in Minnesota and Iowa. Great Plains Easter Blizzard of 1873. April 13, 1873
Seattle Blizzard of 1880. January 6, 1880. Seattle areas greatest snowstorm to date. An estimated 4 feet (120 cm) fell around the town. Many barns collapsed and all transportation halted. The Snow Winter of 1880–1881. Laura Ingalls Wilders book The Long Winter details the effects of the blizzards in the Dakota Territory in  the winter of 1880–1881. In the three year winter period from December 1885 to March 1888, the Great Plains and Eastern United States suffered a series of the worst blizzards in this nations history ending with the Schoolhouse Blizzard and the Great Blizzard of 1888. The massive explosion of the volcano Krakatoa in the South Pacific late in August 1883 is a suspected cause of these huge blizzards during these several years.
Instead, the emphasis tends to be on the patients understanding and a variety of psychotherapeutic techniques. In some cases, the onset of conversion disorder correlates to a traumatic or stressful event. There are also certain populations that are considered at risk for conversion disorder, including people with a medical illness or condition, people with personality disorders or dissociative identity disorder. However, no biomarkers have yet been found to support the idea that conversion disorder is caused by a psychiatric condition. There has been much recent interest in using functional neuroimaging to study conversion. As researchers identify the mechanisms which underlie conversion symptoms, it is hoped they will enable the development of a neuropsychological model. A number of such studies have been performed, including some which suggest the blood-flow in patients brains may be abnormal while they are unwell. However, the studies have all been too small to be confident of the generalisability of their findings, so no neuropsychological model has been clearly established. An evolutionary psychology explanation for conversion disorder is that the symptoms may have been evolutionarily advantageous during warfare. A non-combatant with these symptoms signals non-verbally, possibly to someone speaking a different language, that she or he is not dangerous as a combatant and also may be carrying some form of dangerous infectious disease.