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The 2010 Bronx tornado was a rare EF1 tornado which struck the Bronx in New York City, United States, touching down there on July 25, 2010 and traveled during its ten-minute track. The tornado, which was the second ever tornado recorded in the Bronx, touched down around 2:55 p.m. EDT in Riverdale, located within the Bronx, destroying dozens of trees, flattening cars and toppling power lines. Seven people were injured along its track due to broken glass. The tornado lifted around 3:00 p.m. EDT while still within the Riverdale neighborhood. The thunderstorm that spawned the tornado caused more widespread damage, with downed trees and power lines stretching from Bergen County, New Jersey to Suffolk County, New York. Roughly 4,700 Consolidated Edison customers were left without power following the event; all of whom had their electricity restored the following morning. Since 1950, when the Storm Prediction Center began keeping reliable records of tornadoes, only six other tornadoes have affected New York City, the strongest being an EF2 on August 8, 2007 in Brooklyn. ==Meteorological synopsis== On July 25, 2010, the Storm Prediction Center (SPC) issued a slight risk for severe thunderstorms in the Tri-State Region, with a near 2% chance of a tornado touching down within of a given area.〔 An upper-level trough situated over eastern Canada tracked eastward and was accompanied by a cold front that trailed southward into the Mid-Atlantic states. Thunderstorms that began along the eastern Great Lakes, in Pennsylvania and upstate New York, moved southeastward towards the Atlantic seaboard along a low-level jet stream. The highest risk of tornadoes was in eastern Pennsylvania where low-level wind shear and high Convective available potential energy (CAPE) values were present. However, a less thermodynamic environment in southern New York led to a lower risk around New York City. Around 11:00 a.m. EDT, thunderstorms began developing along the cold front over central Pennsylvania and northern West Virginia. These storms tracked generally towards the east-southeast and were noted as having a chance to develop into bow echo, leading to a high risk of damaging winds. This prompted the SPC to issue a severe thunderstorm watch for all of southern Pennsylvania, the entire state of New Jersey and parts of northern West Virginia, Maryland, Delaware and Virginia. Around the time the watch was issued, wind shear values began to decrease over the region; however, moderately strong winds persisted over a large area, fueling further development of thunderstorms. Ahead of these storms, surface heating from days of above-average temperatures (exceeding ) and a moist air mass provided significant instability, another factor favoring thunderstorm formation. Over the following hours, an isolated thunderstorm developed just outside the watch area and intensified. At 2:46 p.m. EDT, the National Weather Service (NWS) office in Upton, New York issued a severe thunderstorm warning for much of the Tri-State Region. The storm was noted as having winds in excess of 60 mph (95 km/h) as it tracked east at 30 mph (45 km/h). Beginning in Bergen County, New Jersey, a line of wind damage took shape due to the storm as it moved ever closer to New York City. The storm continued to produce damage north of the city but the core entered the Bronx just before 3:00 p.m. EDT. At 2:55 p.m. EDT,〔 a tornado touched down around 5901 Palisades Avenue along the east bank of the Hudson River. According to a resident who lived near where the tornado began, the funnel cloud preceding the tornado developed over the river. Tracking southeast, the tornado impacted a few structures, shattering windows and damaging roofs.〔 The scale of damage to these structures was consistent with an EF1 tornado with winds around 100 mph (155 km/h) on the Enhanced Fujita Scale. The system continued through the Bronx for roughly five minutes before it lifted near the intersection of Riverdale Avenue and 254th Street,〔〔 about from where it began.〔 Continuing across southern New York, the thunderstorm continued to produce wind damage through Suffolk County before moving offshore around 4:05 p.m. EDT.〔 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「2010 Bronx tornado」の詳細全文を読む スポンサード リンク
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