The following events were reported: Hail, Thunderstorm Wind, Tornado. These occurred near station USW00013897, approximately 26.2208 km away, between 2017-03-01 06:45:00 and 2017-03-01 10:42:00. The events included records with hailstones measuring 55.4 inches.The events resulted in 1 injuries and 0 fatalities. The events caused property damage valued at 7756000.0 and crop damage of 0.0. Episode Narrative: The most damaging severe weather outbreak in Middle Tennessee since the December 23, 2015 Tornado Outbreak struck during the morning hours on March 1, 2017. A line of strong to severe thunderstorms with embedded circulations, known as a Quasi-Linear Convective System (or QLCS), moved rapidly across Middle Tennessee at 60-70 mph from west to east between 6 AM and 10 AM CST. Additional severe thunderstorms developed later in the morning and affected areas of southern Middle Tennessee from the late morning into the early afternoon hours. Widespread damaging winds were reported in nearly every county along and north of I-40 across Middle Tennessee, with winds estimated up to 90 mph in some areas. These intense downburst winds caused 3 injuries - two in Clarksville when a tree fell on a mobile home, and one in Lavergne when a tractor trailer flipped over. In addition to the damaging winds, 7 confirmed tornadoes also touched down from the Nashville metro area eastward to the Upper Cumberland, damaging hundreds of homes and businesses. Several reports of large hail were also received in parts of southern Middle Tennessee. The most damaging severe weather outbreak in Middle Tennessee since the December 23, 2015 Tornado Outbreak struck during the morning hours on March 1, 2017. Event Narrative: TDOT reported trees were blown down near Clarksville Highway at Briley Parkway. Public reported and shared photos via Facebook about a swath of straight line wind damage on the Dickson/Cheatham county border around 7 miles southwest of Ashland City. This wind damage stretched from a cattle farm on the west side of the Harpeth river in Dickson county eastward across Harpeth Crossing to Fernie Story Road in Cheatham county. Outbuildings were damaged on the cattle farm and several large trees were uprooted on Harpeth Crossing. A barn was destroyed on Fernie Story Road. An EF-0 tornado touched down in extreme southeast Davidson County near Murfreesboro Pike and Old Hickory Blvd around 717am CST. It cause sporadic damage mainly to trees as it raced to the northeast, although a few homes suffered minor roof damage on Lavergne Couchville Pike, Pepperwood Drive, and Chutney Drive. It then hit the Four Corners Marina around 719am CST and caused extensive damage to docks, boats and shelters. The tornado crossed the Hurricane Creek inlet of Percy Priest Lake into Rutherford County, then blew down a few trees and deposited debris from the marina on the eastern shore of the lake. The tornado then lifted near the northern end of Stones River Road. A Facebook report indicated trees were blown down on Vanderbilt Road at Saundersville Road. The tornado caused sporadic damage mainly to trees as it raced to the northeast, although a few homes suffered minor roof damage on Lavergne Couchville Pike, Pepperwood Drive, and Chutney Drive. A large downburst associated with the rear flank downdraft of the Cool Springs and Four Corners Marina tornadoes caused damage across a wide swath of northeast Williamson, far southeast Davidson, and far northwest Rutherford Counties. In Williamson County, dozens of trees were snapped and uprooted from the Concord Pass area across Waller Road, Forest Trail, and Nolensville Pike, with minor roof and siding damage to numerous homes and a few trees falling on outbuildings and houses. One duplex on Nolensville Pike was heavily damaged by multiple trees falling onto it. ||In Davidson County, trees and power poles were blown down on Pettus Road, and several other trees were snapped and uprooted on Burkitt Road and near Cane Ridge Park. TDOT reported trees down at 13390 Old Hickory Blvd. Several tall power poles were blown down on Nashville Highway near Hickory Woods Drive, and scattered trees were snapped or uprooted in the Hickory Woods Estates and Peppertree Forest subdivisions. ||In Rutherford County, a large truck parked at 1325 Heil Quaker Road in La Vergne was blown over, injuring a man inside who was transported to the hospital. Scattered trees were also snapped and uprooted across the Lake Forest subdivision, where one house was severely damaged by a fallen tree on Frontier Lane. Several more homes suffered roof and siding damage on Cedar Bend Lane, Angel Way Court, and Hollandale Road. Winds in this 12 mile long by 2 mile wide downburst were estimated around 80 mph. Scattered trees were snapped and uprooted across the Lake Forest subdivision, where one house was severely damaged by a fallen tree on Frontier Lane. TDOT reported 3 trees blown down on Highway 250. A large downburst associated with the rear flank downdraft of the Cool Springs tornado caused damage across the Cool Springs area of Franklin and Brentwood. Many trees were snapped or uprooted on Crossroads Boulevard and Mallory Lane near the Cool Springs Galleria. The ceiling of the drive through portion of a bank at the southwest corner of Bakers Bridge Avenue and Mallory Lane collapsed, and one HVAC unit was blown off an HH Gregg store on Galleria Boulevard causing interior roof and water damage. Dozens of trees were snapped and uprooted along Moores Lane from the Nashville Golf Club to Primm Park, and outbuildings at a farm on Moores Lane at Montclair Boulevard suffered roof damage. Winds in this 3 mile long by 1 mile wide downburst were estimated around 80 mph. A house suffered wind damage to the roof, gutters, and siding on Starr Drive in Mount Juliet. A NWS storm survey along with Google Earth high resolution satellite data found a severe 5 mile long by 1/4 mile wide downburst struck the far south side of Watertown just south of Highway 70. This downburst was associated with the rear flank downdraft of the EF1 Watertown tornado located around 1 mile to the north. Numerous large trees were snapped in forests and fields from south of Taylor Road eastward across Beech Log Road and Statesville Avenue, mainly in a northeast direction. Much more severe damage occurred from Highway 267 eastward past Neal Road, just to the south of Watertown High School. Dozen more trees were snapped and uprooted around homes on Highway 267, with one tree falling onto a home. A nearby outbuilding was also destroyed. A carport was flipped and a house lost shingles on File Road. Two older barns suffered roof damage on Neal Road just east of File Road, and a nearby newer barn was completely destroyed. Dozens of trees were also snapped and uprooted in the area from Neal Road northward to Watertown High School, and a carport was destroyed at the end of Neal Road. Winds were estimated up to 85 mph. Williamson County EMA reported 7 trees blown down in the backyard of a home at 5522 Noble King Road. A large tree and power lines were blown down at 8700 Cainsville Road. Williamson County EMA reported and radar data indicated a nearly 1 mile wide swath of straight line wind damage affected areas west of Franklin. Trees were blown down onto a home and a barn at the corner of Still Hollow House Road and Waddell Hollow Road. Several homes between Waddell Hollow Road and Highway 96 from 1979 Old Hillsboro Road to 2019 Old Hillsboro Road suffered minor roof damage, with one home at 2001 Old Hillsboro Road receiving moderate roof damage and requiring a new roof. Numerous trees were also blown down along Old Hillsoboro Road, and one old barn had part of the roof peeled off. TDOT also reported 3 trees blown down on Highway 96. Facebook reports and photos indicated several large trees were snapped and uprooted near Griffintown Road at Wade Reed Road. Multiple homes had shingles and some siding blown off on Pawnee Trail in Madison. Several fences were also blown over and outdoor objects blown around. A tree fell onto a mobile home in Old Hickory. TDOT reported trees were blown down near Douglas Avenue at Ellington Parkway. TDOT reported trees were blown down near Shutes Lane at Old Hickory Boulevard. A tSpotter Twitter report indicated numerous trees were snapped or uprooted along Pinewood Road between Barnhill Road and South Harpeth Road. Half of the roof of a barn at South Harpeth Road and Pinewood Road was also blown off, and fences were blown down. A Facebook post indicated a house and outbuilding were damaged on Morningside Drive. Dupont-Hadley Middle School suffered roof damage and a gas leak. The public estimated a wind gust to 60 mph on the I-40 bridge over the Stones River in Hermitage. Windows were reportedly blown out of homes in Whites Creek. Trees were blown down across the county. A tSpotter Twitter report indicated several trees were blown down along Highway 46 near Waddell Hollow Road. A tSpotter Twitter report indicated a few trees were blown down onto two cars near the Vanderbilt football stadium. A tSpotter Twitter photo showed a tree blown down in the Grassland area. Trees and power lines were blown down 1 mile north of Belle Meade. A Facebook report and photos from the public indicated numerous trees were snapped and uprooted around Highway 12 and Cemetery Road. A few homes also suffered minor damage with shingles blown off, siding damage, and fences blown down. Quarter size hail was reported in Holts Corner. An EF-1 tornado touched down along Hillsboro Road just northwest of the city of Franklin, then moved rapidly east-northeast across the Cool Springs and Brentwood areas of northern Williamson County before lifting just west of the Davidson County line. The first evidence of damage was several trees blown down in the Monticello neighborhood on Poteat Place and Spencer Creek Road near Hillsboro Road. Two sheds were destroyed and more trees snapped and uprooted along South Berrys Chapel Road. Several more trees were blown down and an outbuilding damaged along Mallory Station Road and Jackson Lake Drive, and numerous homes suffered minor to moderate roof, siding, and chimney damage along Sunrise Circle and Brentwood Pointe. Several businesses suffered damage along Mallory Lane and Galleria Boulevard including blown out garage doors and roof damage, and a video of the tornado was taken from a car dashcam on Commerce Way. The tornado then weakened as it crossed Interstate 65, but still blew down seven interstate highway signs along the roadway. As the tornado moved through Brentwood, it continued to blow down trees and cause minor damage to homes and businesses on Westgate Circle, Gordon Petty Drive, Wilson Pike, Demery Court, Crockett Road, and in the Governor's Club neighborhood. The tornado then intensified as it traveled down Concord Road, with dozens of trees snapped and uprooted and numerous homes suffering roof and exterior damage. The tornado then lifted near Owl Creek Park along Chestnut Springs Road just before reaching the Davidson County line. Preliminary estimates from Williamson County Emergency Management indicated that 472 homes and businesses received minor damage, 49 sustained moderate damage, and one home on Sunrise Circle suffered major damage for a total of 522 damaged structures. Damage totals are estimated at 7.27 million dollars. Emergency management reports, media photos and video, and radar data show a brief but intense microburst struck around the intersection of Main Street and New Shackle Island Road in Hendersonville. The roofs were damaged, windows blown out, and signs destroyed on several businesses west of New Shackle Island Road. Just to the east, the roof was blown off and a garage door caved in on a warehouse east of New Shackle Island Road. Several trees and power lines were also blown down in the area. Winds were estimated up to 75 mph. Using Google Earth high resolution satellite imagery along with OHX and TBNA radar data, an EF-0 tornado was determined to have touched down 6.6 miles west of Watertown north of Burnt House Road. This tornado then moved due east across Cainsville Road and rural areas north of Beech Log Road before dissipating into a severe downburst south of Taylor Road, around 3.3 miles west of Watertown. Dozens of trees were snapped and uprooted in all directions in a clearly convergent pattern along the path. One outbuilding was destroyed near a home on Cainsville Road with debris blown towards the north. With most of the path over inaccessible rural areas of Wilson County with no roads, this tornado could only have been determined using the high resolution satellite imagery. An NWS Storm Survey along with Google Earth high resolution satellite data and radar data determined a high end EF-1 tornado touched down in Wilson County just north of Highway 70 (Sparta Pike) in far western Watertown, then curved northeast and east across the northern fringes of the town. One home suffered considerable roof damage at 7077 Sparta Pike and a carport was destroyed at a neighboring home. Another mobile home had most of its metal roof blown off on Linwood Road and several trees were blown down on both sides of the roadway. The tornado intensified as it crossed New Town Road where 2 homes suffered roof damage and dozens of trees were snapped or uprooted in all directions. Another home had roof damage on Parkenson Road where many more trees were snapped and uprooted. The most severe damage occurred along South Commerce Road, where one home suffered considerable roof and siding damage, and the attached garage was knocked off the slab foundation and collapsed. However, the garage was not properly attached to the foundation. An adjacent barn was completely destroyed with debris blown over 200 yards to the southeast. Another barn further south on South Commerce Road was heavily damaged, and the wastewater plant across the road received minor damage. East of South Commerce Road, two wooden TVA high transmission power poles were snapped. A home sustained minor roof damage and a greenhouse was destroyed on the west side of Holmes Gap Road, while another home suffered heavy roof damage and an outbuilding was destroyed on the east side of the roadway. The tornado then weakened as it continued eastward, but still continued to blow down dozens of trees. An outbuilding suffered minor damage south of Hudson Road, and a large outbuilding was destroyed farther east at 850 Haley Road. Numerous more trees continued to be blown down across rural forests and fields to the east before the tornado crossed into Smith County.||In Smith County, the tornado caused EF-0 damage as it crossed Holmes Gap Road around 2 miles southwest of Brush Creek. Two old barns sustained damage on the west side of the roadway, while another barn on the east side was destroyed. Numerous tree were also blown down in the area. The tornado continued to blow down trees in forests to the north of Switchboard Road before dissipating into a large downburst that affected areas south of Brush Creek. The roof was blown off and doors blown out of a hangar at the Smyrna Airport. Five other hangars and the fire station also suffered minor damage. FAA wind equipment on the nearby control tower measured an unofficial wind gust of 71 knots or 79 mph. Facebook photos showed several trees snapped and uprooted on Trinity Drive in Murfreesboro with one tree falling onto and crushing a carport.