![]() ![]() The most active tornado sequence during May occurred from the 16 th-19 th when there were 129 tornado reports across the Great Plains and Upper Midwest. There were 299 confirmed tornadoes during May, the 12 th most active on record. As the storm system moved to the east an EF-1 killed one person in Union County, South Carolina. Martin Parish, Louisiana killing two people. On the April 2 nd, an EF-1 tornado hit a mobile home in St. There were 218 confirmed tornadoes during April, the fifth most active April on record and most active since 2011. ![]() This is the earliest that a tornado has been observed in Minnesota and the first time a tornado has been observed anywhere in the state during March. Two tornadoes were confirmed in Minnesota. The largest single-day tornado count during March was on the 6 th with 79 preliminary tornado reports across the Mid-Mississippi Valley and the Upper Midwest. Two separate EF-3 tornados, one in northern Illinois and another in southern Illinois, resulted in three additional fatalities. Several of the tornadoes were strong including an EF-4 in Perry County Missouri that resulted in 1 fatality. The more active day was February 28 th with 72 preliminary tornado reports. A severe weather outbreak that spanned the last day of February and first day of March resulted in 88 preliminary tornado reports from the Central Plains through the Midwest. This was the first tornado observed in Massachusetts during February since reliable records began in 1950.įor March there were 176 confirmed tornadoes, again marking the second most active March on record, behind March 1976. Late in the month, a usual storm system brought tornadoes to the Northeast with an EF-2 impacting northeastern Pennsylvania and an EF-1 in western Massachusetts. February also saw the second most tornadoes on record for the month with 115, behind the 147 tornadoes during the same month in 2008. The majority of the tornadoes were during the three-day outbreak late in the month. In January there were 142 confirmed tornadoes which is the second most on record for the month behind January 1999 when there were 209 tornadoes. Most months of the year had above-average tornado activity, particularly during the first half of 2017. There were also tornadoes reported with the landfalls of Hurricanes Harvey and Irma. Five other billion dollar disasters had some damages that were associated with severe weather, hail, and tornadoes. During the year there were three tornado outbreaks that had costs exceeding $1 billion in damages - the January 20-22 outbreak in the South, the February 28-March 1 outbreak in the Midwest and Southeast, and the March 6-8 outbreak in the Midwest. In total there were 34 tornado-related fatalities reported during 2017 - 20 in January, four in February, eight in April and two in May. ![]() The deadliest tornado of the year was during this outbreak and impacted Brooks, Cook, and Berrien counties in southern Georgia and killed 11 people. In a hurricane’s outer bands, tornadoes represent a burst of concentrated destruction in an area that otherwise might not see the devastating levels of wind produced by the hurricane’s core.The deadliest outbreaks of the year occurred early in 2017 with 20 fatalities reported during a late-January tornado outbreak across the South. “There’s not a ton of warning to them,” Ward said. The combination of shear and instability that a hurricane offers still produces small supercell storms that are more likely to spawn tornadoes than ordinary thunderstorm cells, NOAA said.Īnd hurricane-produced tornadoes can form quickly and dissipate quickly. … but they pop up with relatively little warning. So, the tornado-producing storm cells from a hurricane “tend to be smaller and shallower,” according to NOAA. Besides vertical sheer, tornadoes thrive on an unstable atmosphere – and most instability happens at lower altitudes for a tropical cyclone than for a storm at higher latitudes, NOAA said. These tornadoes might be a little weaker, and dissipate faster, than a tornado spawned in, say, the US Central Plains. Most tornadoes happen in a tropical cyclone’s outer rain bands, about 50 to 300 miles from the center, though some have been spawned near the inner core, NOAA says. Florida hospitals closing ahead of storm.
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