.Update... This is an event summary with previously released information concerning the tornadoes that occurred in eastern Oklahoma and northwest Arkansas on may 20 2013. We will continue to evaluate information over the coming days. At present the tornado count for this event in the NWS Tulsa area of responsibility is eleven.
Start date: may 20 2013 start time: 351 PM CDT start location: 5 SSW Avant / Osage County / OK
End date: may 20 2013 end time: 405 PM CDT end location: 5.2 WNW Vera / Washington County / OK
Survey summary: numerous trees were snapped or uprooted. A home was damaged by a large limb that fell onto its roof. This tornado path is likely multiple tornadoes. Chaser video will be used to determine how many segments may have occurred.
Start date: may 20 2013 start time: 433 PM CDT start location: 5.8 ENE Ramona / Washington County / OK
End date: may 20 2013 end time: 447 PM CDT end location: 3.4 NNW Talala / Rogers County / OK
Survey summary: this tornado remained over open country for most of its lifecycle. The rating is based on the single home that it is known to have damaged and the nearby barn. The path length is therefore an estimate based on radar data and the width will be an estimate mainly based on chaser video.
Start date: may 20 2013 start time: 625 PM CDT start location: 4 N Fairland / Ottawa County / OK start lat/lon: 36.8129 / -94.8461
End date: may 20 2013 end time: 640 PM CDT end location: 4 NE Wyandotte / Ottawa County / OK end lat/lon: 36.8298 / -94.6706
Survey summary: this tornado snapped or uprooted numerous trees and damaged numerous homes. The most significant damage was located near the area where the tornado crossed Highway 137 where a metal building was severely damaged and several homes were damaged. Many Hardwood trees were also snapped in that area.
Start date: may 20 2013 start time: 632 PM CDT start location: 2.8 NW Wyandotte / Ottawa County / OK start lat/lon: 36.8128 / -94.7701
End date: may 20 2013 end time: 642 PM CDT end location: 0.5 se Seneca / Newton County / MO end lat/lon: 36.8359 / -94.6062
Survey summary: this tornado damaged several houses... damaged barns or outbuildings... and snapped or uprooted a number of trees. It dissipated over the south side of Seneca Missouri after snapping or uprooting several trees as it crossed the state line and crossed Highway 43. Several eyewitnesses north of Wyandotte saw two tornadoes approaching from the west and radar data as well as damage patterns support that conclusion. In addition... there was lots of evidence of straight-line wind damage south of the tornado paths as the Bow echo storm surged east as it approached the state line.
Start date: may 20 2013 start time: 649 PM CDT start location: 1.8 NW Siloam Springs / Benton County / AR start lat/lon: 36.2001 / -94.5690
End date: may 20 2013 end time: 654 PM CDT end location: 2.5 NNE Siloam Springs / Benton County / AR end_lat/lon: 36.2217 / -94.5263
Survey_summary: the tornado appeared to touchdown just inside the Arkansas state line and travel east-northeast before turning more to the north and dissipating. The tornado did minor damage to several homes and damaged many trees. The tornado appeared strongest after the turn to the north and while its width was diminishing. During this time it... downed several very large trees in a cyclonic fashion. Widespread damaging winds occurred in the Siloam Springs area with wind speeds near that of the tornado... so the damage assessment was complicated. In addition... we have seen social media images that suggest there was a funnel cloud more directly over Siloam Springs. Given the widespread wind damage that was on par with that of the tornado it has been difficult to directly tie damage to The Funnel cloud picture... but we will continue to evaluate information. The official record for this and all tornadoes is not submitted for 2 months following the event.
Start date: may 20 2013 start time: 844 PM CDT start location: 5.1 SSW Cameron / Le Flore County / OK start lat/lon: 35.0737 / -94.5888
End date: may 20 2013 end time: 855 PM CDT end location: 3.6 ENE Cameron / Le Flore County / OK end_lat/lon: 35.1538 / -94.4761
Survey summary: the tornado did minor damage to the roof of one home and downed or damaged a number of trees. The damage in Poteau was the result of straight-line winds that were the precursor to the tornado. The Mobile home damaged near the end of the tornado path was most likely damaged by wind.
Ef scale: the Enhanced Fujita scale classifies tornadoes into the following categories.
EF0... weak... ... 65 to 85 mph EF1... weak... ... 86 to 110 mph EF2... strong... .111 to 135 mph EF3... strong... .136 to 165 mph EF4... violent... 166 to 200 mph EF5... violent... >200 mph
Note: the information in this statement is preliminary and subject to change pending final review of the events and publication in NWS storm data.
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