Tornado
The United States has the most tornadoes of any country, nearly four times more than estimated in all of Europe, excluding waterspouts. This is mostly due to the unique geography of the continent. North America is a large continent that extends from the tropics north into arctic areas, and has no major east-west mountain range to block air flow between these two areas. In the middle latitudes, where most tornadoes of the world occur, the Rocky Mountains block moisture and buckle the atmospheric flow, forcing drier air at mid-levels of the troposphere due to downsloped winds, and causing the formation of a low pressure area downwind to the east of the mountains. Increased westerly flow off the Rockies force the formation of a dry line when the flow aloft is strong, while the Gulf of Mexico fuels abundant low-level moisture in the southerly flow to its east. This unique topography allows for frequent collisions of warm and cold air, the conditions that breed strong, long-lived storms throughout the year. A large portion of these tornadoes form in an area of the central United States known as Tornado Alley. This area extends into Canada, particularly Ontario and the Prairie Provinces, although southeast Quebec, the interior of British Columbia, and western New Brunswick are also tornado-prone. Tornadoes also occur across northeastern Mexico.
List of United States tornadoes from January to March 1982
This is a list of all tornadoes that were confirmed by the National Climatic Data Center in the United States from January to March 1982. During this period, 81 tornadoes touched down across 23 states, resulting in 7 fatalities and numerous injuries. The strongest of these storms was an F4 in the Texas and Oklahoma Panhandles on March 18. Activity greatly varied between the three months, with January being above average, February at record low levels and March around average. Aside from two notable outbreaks, tornado events were sporadic and scattered across the country. More than half of the 60 tornadoes in March occurred during a single outbreak from March 14 to 17.