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Tornadoes of 2010
This page documents the tornadoes and tornado outbreaks of 2010. The majority of tornadoes form in the U.S., but they can occur almost anywhere under the right conditions. A lesser number occur outside the U.S., most notably in parts of neighboring southern Canada during the Northern Hemisphere's summer season, but are also known in South America, Europe, Asia, and Australia.
There were 1,282 tornadoes confirmed in the United States in 2010, with 45 confirmed fatalities. Elsewhere in the world, 11 people were killed in tornadoes: six in Argentina, three in the Bahamas and one each in Bangladesh and Germany. The year was near average for tornadoes despite an extremely quiet early spring period, however such changed after a huge upswing starting in late April and a busy late spring and summer period. The autumn months were slightly above average.
==Synopsis==
The year started with above-normal activity in January, primarily as a result of a single moderate outbreak late in the month. After that, arctic air settled in across the central and southern United States, suppressing warm air to the Caribbean, and as a result, February saw only one isolated tornado as the air mass throughout the month was highly unfavorable for any severe weather development. In early March, predictions for an active tornado season were voiced by meteorologists should the pattern continue as it had during January and February,〔 with El Nino also cited as possibly bringing an above average season.〔 However, March and the first half of April also had well below normal activity, and overall the early spring period was among the least active in recent years. Through mid-April, the season had been one of the least active in the historical record (see graphic above right).
Two very large tornado outbreaks in late April ended the slow period, pushing April activity to near normal. May, which is typically the most active month for tornado activity, was somewhat above normal, as several larger outbreaks were spread throughout the month. June was a very active month with at least one isolated tornado activity on most days and two major tornado outbreaks plus several smaller outbreaks resulting in well over 400 tornado reports. The active pattern continued into July, with activity again above normal due to steady activity throughout the month despite no major outbreaks. The active pattern came to a stop by August, with below-normal activity. September was also slightly below to near average, with only modest tropical activity contributing. The fall months were moderately active, although October was one of the most active on record as the result of one single outbreak late in the month. November and December were both above average with most of the activity clustered in two outbreaks, one at the end of each month, with both months generally inactive until those tornado outbreaks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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