Information on this webpage is considered preliminary and will continue to be updated as the event is analyzed.

Anyone with information that could enhance the record of these storms should contact the National Weather Service Office in Tulsa at 918-838-7838 during business hours, submit an online storm report, or send us an email at: sr-tsa.stormreport@noaa.gov. Information can also be posted on our Facebook page.

 

Jump to: Event Summary
Meteorological Data from SPC 5/19/2013
Meteorological Data from SPC 5/20/2013
  Prague-Welty Tornado
Avant Tornado Ramona Tornado
  Talala Tornado Wyandotte #1 Tornado Wyandotte #2 Tornado
  Proctor Tornado Christie Tornado Westville Tornado
  Siloam Springs Tornado Beaver Lake Tornado McCurtain-Bokoshe Tornado
  Cameron Tornado Tornado Debris Signature  
  Other Event Images Information on the Moore, OK Tornado (from NWS Norman) Return to all Weather Events webpage

Event Summary - May 19-20, 2013 Tornado Events

Severe thunderstorms developed across central Oklahoma along a dry line during the late afternoon of May 19th. Very unstable air combined with very strong wind shear allowed these storms to evolve rapidly into supercells, which produced several damaging tornadoes in central Oklahoma (see NWS Norman for information) before moving into eastern Oklahoma. Most of these supercell thunderstorms gradually weakened as they moved into the eastern portion of the state. The storm that produced damaging tornadoes around Shawnee also produced a strong tornado west and northwest of Prague, and another north northeast of Prague that moved across northwestern Okfuskee County.  Another supercell produced a brief tornado northwest of Shamrock in northwestern Creek County before weakening as it moved further into northeastern Oklahoma.

The same dangerous atmospheric conditions persisted on May 20, 2013. By mid-afternoon, thunderstorms developed rapidly across central Oklahoma. Approximately 30-40 minutes after the storms formed, the strongest ones began producing tornadoes. A violent tornado devastated the Oklahoma City suburb of Moore, OK (for the 3rd time in 14 years). Information on the Moore, OK tornado, as well as the other tornadoes in central Oklahoma, can be found from the NWS Norman office. As the storms progressed east, additional tornadoes developed in eastern Oklahoma during the late afternoon and early evening hours.  An outflow boundary left over from the storms on the 19th was draped from far northwest Arkansas, through Tulsa, to the Ponca City area.  This boundary provided a local enhancement of storm relative helicity, one of the ingredients for tornadoes, and tornadoes were reported in the Skiatook/Vera area, near Talala, and in Ottawa County.  As more storms developed, a line of severe thunderstorms moved eastward across eastern Oklahoma and into western Arkansas.  This line contained bowing segments that produced damaging straight-line winds and several tornadoes, as well as embedded supercells.  

Debris from both the Shawnee and Moore tornadoes have been found in portions of eastern OK, primarily across Creek, Okfuskee, and Tulsa Counties.  The Facebook page May2013OklahomaTornadoDocPhotoRecoveryPage (this is not an NWS page) is trying to reunite these photos and documents with their owners.  NWS radars detected some of this debris.  More information can be found below in the Tornado Debris section.

During the early morning hours of May 21, a convective line developed from southwest to east central Oklahoma near the cold front.  The front slowly moved south and stalled briefly near the Red River during the day.  Thunderstorms continued to develop along and north of the front as an upper-level wave moved through the region.  The winds were nearly parallel to the front, leading the training of storms.  This in turn led to widespread 2"-4", and isolated totals of around 6", of rain in southeast Oklahoma, the same area that had received widespread 1"-3" the day before.  The highest 24-hour rainfall total ending at 7am CDT 5/22/13 of 6.20" was measured 4 miles ENE of Daisy, OK, near the Atoka-Pushmataha-Pittsburg County lines.  This station reported 1.60" the previous day, for a 2-day total of 7.80".  The 2-day rainfall total across southeast Oklahoma and west central Arkansas ended up being 2.5"- around 7.5" (see the Other Images section below for a 3-day rainfall total map).  All of this rain led to widespread flash flooding and moderate flooding along the Kiamichi River near Antlers.

 

This Preliminary Event Impact Map will be updated as additional information is received.  Click on the icons within the map for additional details and/or images related to that impact.  Tornado information can be found by clicking on the track.  Individual tornado track maps and images may be available below the overview Event Impact Map.

Tornado Tracks: Due to mapping/GPS software differences and road accessibility along the track, use the plotted tracks for general reference only. Tornado tracks may be updated and/or changed due to storm damage surveys, data analysis, and eyewitness reports. Colored icons represent the Storm Survey rating assigned to surveyed damage. Click on the icon for additional information and available photos. You may need to zoom in tightly to see all the available data points when data points are logged close to one another.  Links to photos are available in the upper portion of the text window that opens when you click on one of the colored data icons or points. 

Tornado, Hail, Wind, and Flood Reports: Click on the icon for the time, location, and description of the storm report. Note that these reports are preliminary and the time and/or location may not be accurate. Click here to submit your storm report.

You can download the .kmz file displayed on the map by clicking on the layer name located just above the map.

Survey Legend

 

 


 

 

 

Maps
Cities/Roads: Counties:

 


 Preliminary Tornado Information (last updated 10:30 am 5/29/13):

Information from this event is still considered preliminary and will be modified based on additional information that may become available to us.  Anyone with information that could enhance the record of this event should contact the National Weather Service Office in Tulsa at 918-838-7838 during business hours, or send us an email at sr-tsa.stormreport@noaa.gov, or submit an online report

Damage images for each tornado can be found by clicking on the icons within the track map.  Additional images related to each tornado can be enlarged by clicking.  Hover your mouse over the image for a caption.

 

Prague-Welty Tornado (Lincoln/Okfuskee Counties OK)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 100 to 110 mph
This tornado snapped or uprooted numerous trees and damaged barns and outbuildings.
Path Length 14.5 miles
Maximum Path Width 700 yards
Start Location and Time 3.5 NNE Prague, OK at 7:17 pm CDT May 19, 2013
End Location and Time 3.3 NW Welty, OK at 7:40 pm CDT May 19, 2013


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radar image of Prague/Welty tornado
radar image of Prague/Welty tornado
radar image of Prague/Welty tornado

 

Avant Tornado (Osage/Washington Counties OK)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 100-110 mph
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.
Path Length 6.5 miles
Maximum Path Width 500 yards
Start Location and Time 5 miles SSW Avant, OK at 3:51 pm CDT May 20, 2013
End Location and Time 5.2 miles WNW Vera, OK at 4:05 pm CDT May 20, 2013


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radar image of Avant area tornado
radar image of Avant area tornado
radar image of Vera area wall cloud
 

Ramona Tornado (Washington County OK)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 95-105 mph
This tornado damaged a couple of homes and snapped or uprooted several trees.
Path Length 4.5 miles
Maximum Path Width 400 yards
Start Location and Time 3 miles SE Ramona, OK at 4:21 pm CDT May 20, 2013
End Location and Time 5.2 miles E Ramona, OK at 4:30 pm CDT May 20, 2013


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radar image of Ramona tornado
 
 
 

Talala Tornado (Washington/Rogers Counties OK)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 95-105 mph
This tornado was photographed by a number of witnesses and remained over open country for much of its lifecycle to the northwest of Talala.  The rating is based on the single home that it is known to have damaged and the nearby barn.  This home had roof damage, windows broken out, chimney torn off the roof, and a nearby metal framed barn damaged with bay doors blown out on both sides.  The path length is an estimate based on radar data, and the width is an estimate based on chaser video.
Path Length 6 miles
Maximum Path Width 500 yards
Start Location and Time 5.8 miles ENE Ramona, OK at 4:33 pm CDT May 20, 2013
End Location and Time 3.4 miles NNW Talala, OK at 4:47pm CDT May 20, 2013


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Talala tornado image
Talala tornado image
radar image of Talala area tornado
 

Wyandotte #1 Tornado (Ottawa County OK)
EF-Scale EF-2
Damage:
Maximum Estimated Wind Speed 115-125 mph
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. Several eyewitnesses north of Wyandotte saw 2 tornadoes approaching from the west, and radar data, as well as the damage patterns, support that conclusion.  In addition, there was a lot of evidence of straight-line wind damage south of the tornado paths as the bow echo storm surged east and approached the state line.
Path Length 10 miles
Maximum Path Width 800 yards
Start Location and Time 4 miles N Fairland, OK at 6:25 pm CDT May 20, 2013
End Location and Time 4 miles NE Wyandotte, OK at 6:40 pm CDT May 20, 2013


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radar image of Wyandotte 1 tornado
aerial image of Wyandotte damage
aerial image of Wyandotte damage
 

Wyandotte #2 Tornado (Ottawa County OK/Newton County MO)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 100-110 mph
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, MO after snapping or uprooting several trees when it crossed the state line and Hwy 43.  Several eyewitnesses north of Wyandotte saw 2 tornadoes approaching from the west, and radar data, as well as the damage patterns, support that conclusion.  In addition, there was a lot of evidence of straight-line wind damage south of the tornado paths as the bow echo storm surged east and approached the state line.
Path Length 9.5 miles
Maximum Path Width 600 yards
Start Location and Time 2.8 miles NW Wyandotte, OK at 6:32 pm CDT May 20, 2013
End Location and Time 0.5 miles SE Seneca, MO at 6:42 pm CDT May 20, 2013


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radar image of Wyandotte 2 tornado
 
 
 

Proctor Tornado (Adair County OK)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 95-105 mph
This tornado uprooted trees and snapped a few trees.
Path Length 2 miles
Maximum Path Width 150 yards
Start Location and Time 1.7 miles SE Proctor, OK at 6:32 pm CDT May 20, 2013
End Location and Time 2.8 miles E Proctor, OK at 6:34 pm CDT May 20, 2013


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radar image of Proctor tornado
 
 
 

Christie Tornado (Adair County OK)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 100-110 mph
This tornado snapped or uprooted trees and damaged a barn.
Path Length 2.5 miles
Maximum Path Width 300 yards
Start Location and Time 2.5 milesSW Christie, OK at 6:35 pm CDT May 20, 2013
End Location and Time 1 mile NW Christie, OK at 6:37 pm CDT May 20, 2013


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radar image of Proctor tornado
 
 
 

Westville Tornado (Adair County OK/Washington County AR)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 100-110 mph
This tornado destroyed two barns, damaged another barn, and snapped or uprooted numerous trees.
Path Length 8 miles
Maximum Path Width 500 yards
Start Location and Time 2.7 miles WSW Christie, OK at 6:40 pm CDT May 20, 2013
End Location and Time 1.6 miles N Cincinnati, AR at 6:47 pm CDT May 20, 2013


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radar image of Westville tornado
 
 
 

Siloam Springs Tornado (Benton County AR)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 85-90 mph
This 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 cloudy picture, but we will continue to evaluate information.
Path Length 2.9 miles
Maximum Path Width 500 yards
Start Location and Time 1.8 miles NW Siloam Springs,  AR at 6:49 pm CDT May 20, 2013
End Location and Time 2.5 miles NNE Siloam Springs, AR at 6:54 pm CDT May 20, 2013


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radar image of Siloam Springs tornado
 
 
 

Beaver Lake Tornado (Benton County AR)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 90-95 mph
This tornado damaged one home, several boat docks, and snapped many oak trees.  The tornado was embedded in a wide swath of damaging winds.
Path Length 0.8 miles
Maximum Path Width 270 yards
Start Location and Time 7.5 miles SE Prairie Creek, AR at 7:24 pm CDT May 20, 2013
End Location and Time 7.8 miles ESE Prairie Creek, AR at 7:25 pm CDT May 20, 2013


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radar image of Beaver Lake tornado
 
 
 

McCurtain-Bokoshe Tornado (Le Flore County OK)
EF-Scale EF-0
Damage:
Maximum Estimated Wind Speed 70 mph
Local law enforement reported a tornado between McCurtain and Bokoshe, which was co-located with a strong radar circulation.  Broadcast media reported power flashes in this area. Emergency Management reported tree damage.
Path Length 0.7 miles
Maximum Path Width 260 yards
Start Location and Time 5.9 miles southwest of Bokoshe, OK at 8:33 pm CDT May 20, 2013
End Location and Time 5.2 miles southwest of Bokoshe, OK at 8:33 pm CDT May 20, 2013


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radar image of Bokoshe tornado
 
 
 

Cameron Tornado (Le Flore County OK)
EF-Scale EF-1
Damage:
Maximum Estimated Wind Speed 85-90 mph
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.
Path Length 8.5 miles
Maximum Path Width 500 yards
Start Location and Time 5.1 miles SSW Cameron, OK at 8:44 pm CDT May 20, 2013
End Location and Time 3.6 miles ENE Cameron, OK at 8:55 pm CDT May 20, 2013


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radar image of Cameron area tornado
radar image of Cameron tornado
 
 

 Other Event Images

Image captions below the image.  Click on image to open a larger version in a new window.

3 day rainfall total bow echo radar image near Springdale
 3-day rainfall total from 8am CDT May 19 to 8am CDT May 22, 2013 KSRX reflectivity image at 7:12 pm CDT showing the bow echo over the Springdale, AR area.  

 

Tornado Debris

Debris from both the Shawnee and Moore tornadoes have been found in portions of eastern OK, primarily across Creek, Okfuskee, and Tulsa Counties.  The Facebook page May2013OklahomaTornadoDocPhotoRecoveryPage (this is not an NWS page) is trying to reunite these photos and documents with their owners. 

The recently installed Dual-Pol capability at NWS radars was able to detect this debris.  Analysis of this data, referred to as Tornado Debris Signatures (TDS), indicate that the Shawnee and Moore tornadoes lofted light-weight debris to very high altitudes.  These signatures, with low correlation coefficients (CC), were not located in regions of "clear air" radar returns or in areas that would support large hail (other factors that could produce similar low CC values).  There is also a continuity between radar volume scans with the area of debris moving northeast into Creek, Okfuskee, and Tulsa Counties.  Calculations from the Oklahoma City radar (KTLX) has debris from the Moore tornado at approximately 40,000 feet about the ground.  The Tulsa radar (KINX) shows debris signature heights from the Moore and Shawnee tornadoes in the 30,000-35,000 feet range.  If these are indeed debris signatures, this would likely be one, if not the highest altitudes seen since the nationalwide upgrade to the Dual-Pol capability.

  Click on the image for a larger view in a new window.

radar debris signature radar debris signature
TLX radar reflectivity (left) and CC (right) showing the debris signature from the Moore, OK tornado. INX radar reflectivity (left) and CC (right) showing the debris signature from the Moore, OK tornado.
   
radar debris signature radar debris signature
TLX radar reflectivity, base velocity, and CC showing the low level (850 feet above the ground) Moore tornado debris signature (circled in black).  Image courtesy of NWS Norman INX radar reflectivity (left) and CC (right) showing the debris signature from the Shawnee, OK tornado.

 


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