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The May 26–31, 2013 tornado outbreak was a prolonged and widespread tornadic event that affected a large portion of the United States. The outbreak was the result of a slow-moving but powerful storm system that produced several strong tornadoes across the Great Plains states, especially in Kansas and Oklahoma. Other strong tornadoes caused severe damage in Nebraska, Missouri, Illinois, and Michigan. The outbreak extended as far as New York. 27 fatalities were reported in total, with nine resulting from tornadoes (eight in Oklahoma and one in Arkansas). ==Meteorological synopsis== On May 22, an upper-level low moved eastward over the Western United States, with forward progression limited by a blocking high around the Northern Plains and Great Lakes. With ample low-level moisture streaming north ahead of the low into an area of moderate instability, scattered severe weather was anticipated over parts of Colorado, Kansas, and Nebraska starting on May 24. The first tornado associated with the system was a small landspout tornado that touched down in rural Idaho on May 26.〔(【引用サイトリンク】title=Storm Prediction Center 20130526's Storm Reports )〕 The tornadic activity became more intense the following day. On May 27, while only scattered tornadoes touched down, four of them were strong and caused considerable damage in parts of Kansas and Nebraska. One tornado near Lebanon, Kansas reached EF3 intensity, and an EF2 near Marysville caused major damage to several structures. In Nebraska, the town of Edgar took a direct hit from an EF2.〔(【引用サイトリンク】title=May 27th, 2013: Severe Weather Strikes Portions of the Area - Including Tornadoes )〕〔(【引用サイトリンク】title=May 27th, 2013 Marshall County EF-2 Tornado )〕 Vigorous tornado activity continued on May 28. While the Storm Prediction Center only issued a slight risk that day, widespread tornadoes touched down in several states, some strong to violent. Several powerful supercell thunderstorms developed in central Kansas that afternoon, and large tornadoes were reported. Near the town of Corning, a strong EF3 carved an unusual V-shaped path through rural areas west of town, and completely destroyed two homes.〔(【引用サイトリンク】title=May 28th, 2013 Nemaha County EF-3 & EF-1 Tornadoes )〕 An even larger tornado, an EF3 wedge that was over a quarter mile wide, touched down just west of Bennington, and remained nearly stationary in a field for over an hour. This tornado resulted in relatively moderate damage, but killed over 100 head of livestock.〔(【引用サイトリンク】title=May 28th, 2013 Ottawa County EF-4 Tornado )〕 The tornado was originally rated EF4 based on mobile radar readings, but ground surveys did not reveal damage indicative of EF4 wind speeds, and the tornado was downgraded to an EF3 as a result.〔(【引用サイトリンク】title=Storm Events Database - Event Details | National Climatic Data Center )〕 Later that evening, large tornadoes were sighted in southern Michigan, prompting several tornado emergencies. A total of six tornadoes were confirmed to have touched down in areas near Flint, two of which reached EF2 intensity and caused significant damage.〔(【引用サイトリンク】title=Tornado Outbreak of May 28, 2013 & Updated Damage Tracks )〕 Numerous weak tornadoes were documented in other states.〔 On May 29, the Storm Prediction Center issued a moderate risk for parts of Texas, Oklahoma, and Kansas. The outlook included a 10% hatched risk for tornadoes. A separate slight risk was issued for parts of New England. In the main risk area, only scattered weak tornadoes touched down, though a mile-wide EF2 wedge tornado touched down in upstate New York near Schenectady. On May 30, for the second day in a row, the Storm Prediction Center issued a moderate risk with a 10% hatched risk of tornadoes, this time for eastern Oklahoma and a small part of Kansas. Numerous tornadoes touched down in Oklahoma and Arkansas, including a few that were strong. An EF2 ripped through the Tulsa suburb of Broken Arrow, resulting in severe damage to homes and businesses.〔(【引用サイトリンク】title=May 29 - 31, 2013 Severe Weather & Flooding )〕 A brief EF1 near Tull, Arkansas unfortunately caused a fatality due to a falling tree. On the morning of May 31, a strong cap was in place over much of central Oklahoma into eastern Oklahoma. With dewpoints creeping into the low 70s, the Storm Prediction Center early on considered upgrading part of the moderate risk forecast zone to a high risk forecast zone. As the day went on, there was no upgrade, but it became evident the atmosphere was ripe with CAPE values in excess of 4000 J/kg. With the presence of an extremely unstable air mass over central Oklahoma, the Storm Prediction Center issued a Particularly Dangerous Situation Tornado Watch for much of the state during the afternoon of May 31 and lasting into the night. Later that evening, severe storms rapidly developed, and an extremely large and violent multiple-vortex tornado devastated areas near El Reno, Oklahoma, and killed eight people including three men from the storm chasing crew, TWISTEX. The tornado had been rated EF5 based on mobile radar readings, Other weak tornadoes and major flooding devastated parts of the Oklahoma City metro that evening. Further north, a powerful squall line of severe storms with several embedded strong tornadoes developed in Missouri. One of the tornadoes, a large and rain-wrapped EF3, caused major damage in several St. Louis suburbs. Weak tornadoes touched down in several other states.〔(【引用サイトリンク】title=Severe Weather Event - Nine Tornadoes Surveyed )〕〔(【引用サイトリンク】title=Preliminary Storm Data Reports for the May 31-June 1, 2013 Tornado and Flash Flood Event )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「May 26–31, 2013 tornado outbreak」の詳細全文を読む スポンサード リンク
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