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

 

Event Summary - December 30-31, 2010 Severe Thunderstorms/Tornadoes

Severe thunderstorms on the evening of 30 December 2010 through the morning of 31 December 2010 produced hail, wind damage and at least two tornadoes in eastern Oklahoma and northwest Arkansas.  

A band of strong to severe thunderstorms developed during the early morning hours of December 31st, along and ahead of a Pacific cold front across eastern Oklahoma. While instability was limited, impressive deep-layer shear resulted in the formation of embedded supercell thunderstorms. One of the main thunderstorms of interest displayed rapid intensification in low-level rotation across central Adair County shortly before 6:00 am CST. This supercell tracked quickly to the northeast, resulting in significant damage in the towns of Westville in Adair County, Oklahoma, and Cincinnati in Washington County, Arkansas. Another supercell intensified across southern Adair County around 6:15 am, tracked across central and northeastern Washington County, and eventually into Carroll County around 7:30 am. A weak tornado developed at about 7:48 am CST southwest of Blue Eye in extreme north-central Carroll County, resulting in mainly tree damage before it moved into Missouri at about 7:50 am CST.

Three fatalities occurred in Cincinnati along with seven injuries as extensive damage to brick homes, mobile homes, and other structures occurred along the tornado track. A woman who was in a mobile home northeast of Cincinnati when the tornado struck was transported to a hospital with serious injuries on the 31st. She passed away due to those injuries on January 4th. Debris from this tornadic supercell was reported as far away as Bentonville, Bella Vista, and Pea Ridge - some 20 to 30 miles to the north and northeast. 

 

Preliminary Information on the Cincinnati Tornado (last updated 11 am CST 1/5/2011):

Cincinnati Tornado (Adair County OK, Washington County AR, Benton County AR)

Began: Near Westville, OK in Adair County OK at about 6:05 AM CST 12/31/2010

Ended: 3 miles northwest of Tontitown, AR in Washington County AR at about 6:27 AM CST

Path Lenth: 21 miles

Max Path Width: about 500 yards

EF Rating: EF3 with maximum estimated winds of about 140 mph.  This EF rating is primarily based on severe damage to 3 permanent homes and a destroyed metal (volunteer fire department) building system in Cincinnati.

Detailed Preliminary Survey Information

A NWS survey team assessed storm damage from the December 31, 2010 morning tornadoes that impacted portions of Adair County in eastern Oklahoma and Washington and Benton Counties in northwestern Arkansas.

The team determined that a tornado developed just northeast of Westville, OK at about 6:05 am CST on the morning of December 31, 2010.  The tornado tracked rapidly northeast damaging a home, tossing four vehicles, snapping large power poles, and snapping and uprooting large trees in Adair County OK.

The tornado moved into Washington County AR about 2 miles southwest of Cincinnati at about 6:08 am CST and then impacted the town of Cincinnati at about 6:10 am CST.  Several permanent homes were destroyed, a mobile home was destroyed, several other permanent homes were damaged, numerous trees were snapped or uprooted, numerous power poles were snapped, barns and outbuildings were destroyed.  Two people were killed in the mobile home that was destroyed and a third was killed either in or near a barn while he was tending to his cattle.  At least 7 injuries also occurred.  The tornado was about 300 yards wide when it went through the town.

The tornado continued to move quickly northeast and widened to about 500 yards, severely damaging several other permanent homes, destroying at least six chicken houses, snapping or uprooting numerous trees, snapping numerous power poles, and destroying a number of outbuildings. The tornado struck several other mobile homes, severely injuring a woman who passed away as a result of those injuries in the hospital January 4th.  The tornado passed into Benton County AR just north of Wedington at about 6:17 am CST.

In Benton County, the tornado severely damaged a couple of homes, destroyed a mobile home, destroyed barns, snapped and uprooted numerous trees, and snapped power poles. Two injuries occurred in the mobile home that was destroyed on Winwood Ranch Road.

The tornado continued northeast, crossing back into Washington County where trees were blown down. The rapid northeast movement then took the tornado back into Benton County, where a home lost its roof, several outbuildings were destroyed, and trees and power poles were snapped on Robinson Road about 2 miles south of Highway 412. The tornado then finally moved back into Washington County where it destroyed a home on the western city limits of Tontitown, blew a mobile home off its piers, and snapped or uprooted large trees before dissipating about 3 miles northwest of Tontitown at about 6:27 am CST.

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.

 Image captions below the image.  Click on image to open a larger version in a new window. Additional images can be found in the Event Map below.

Doppler radar data showing the supercell near Cincinnati, AR Radar velocity data showing rotation near Cincinnati, AR 
NWS Doppler radar data showing a supercell near Cincinnati, AR (Washington County).  6:09 AM CST 31 Dec 2010 NWS Doppler radar data showing a low-level rotation near Cincinnati, AR.  6:09 AM CST 31 Dec 2010  (Green is air motion toward the Ft. Smith radar and red is air motion away from the radar.) 
Surface map at 6am CST December 31, 2010  Radar Loop of Cincinnati, AR tornado
Conditions at 6 AM CST 12/31/2010 Radar reflectivity and rotation loop from the Ft. Smith radar of the Cincinnati, AR tornado. Loop is from 6:01 to 6:41 AM CST 12/31/2010
damage northeast of Westville looking southwest down tornado path
Damage northeast of Westville, OK Looking Southwest down the tornado path in Cincinnati, AR
looking northeast up the tornado path destroyed metal building system (Cincinnati VFD)
Looking northeast up the tornado path in Cincinnati, AR Destroyed metal building system (Cincinnati Volunteer Fire Dept.)

 

Preliminary Event Impact Map This 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.

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.

Storm Survey: 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.

Hail, Wind, and Flood Reports: Click on the icon for the time, location, and description of the storm report. Click here to submit your storm report.

Other Data: Additional data or images from the event.

Survey Legend

 


 
 
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