Tornado Index # 19910426.40.37

 
 
 

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Disclaimer |?|

Note: This approximate tornado path has been generated from data provided by the NCDC.

The Tornado History Project generates approximate paths through separate historical archives provided by the Storm Prediction Center (SPC) and the National Climatic Data Center (NCDC). Paths generated from the NCDC data are typically more detailed, but neither archive gives exact path information. There are several reasons that paths may be inaccurate:

  • Tornado touchdown and liftoff coordinates were recorded with only 2 digits of decimal precision (i.e. [33.72, -86.15] vs [33.71689, -86.15463]). As a consequence, the observed points on the map may be slightly off from actual. Note that beginning in 2009, up to 4 digits of decimal precision are given.
  • Coordinates have not historically been calculated via GPS (Global Positioning System). Thus, tornado touchdown and liftoff coordinates should be considered as estimates only.
  • Tornadoes may not have been in contact with the ground for the entire path as depicted on the map. Storm damage in any location depicted under the "path" should not be inferred.
  • Although paths are drawn as straight lines between any two sets of coordinates, the tornado may have "zigzagged" in some way.
  • Although paths are drawn as uniform thin lines on the map, it is likely that the tornado changed size over its lifetime. Damage in any location depicted under (or not under) the "path" should not be inferred.

Even with the above in mind, the data is the best available. If you see a path that is depicted incorrectly, please post a comment in the tornado forum indicating why you belive the path to be incorrect.

Paths generated from NCDC data are typically more detailed due to the way coordinates are listed in each archive:

  • SPC database - A maximum of 2 coordinates (touchdown and liftoff) is given for each tornado, or each state segment of a tornado if it is a multi-state tornado. Thus the vast majority of paths are depicted as simple straight lines.
  • NCDC database - Some tornadoes have mutliple sets of coordinates within any state, generally corresponding to entry and exit points by county. Thus, since more coordinates have been used to draw the path, the depicted path should be more accurate. Having said that, most tornadoes do not have additional path data in the NCDC archive. When they do, paths are drawn from the NCDC data.

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Statistics   Definitions |?|

The following statistics and definitions are derived from the Storm Prediction Center (SPC) historical tornado archive. The Tornado History Project can not guarantee the accuracy of the underlying data within the SPC historical tornado archive. However, the data as presented here is guaranteed to match the SPC data, except where noted.

Some definitions will not be given since they are obvious (i.e. "Date", "Time", etc...)
Special Note: This site uses a unique index number to identify each tornado. This index number is not a part of the official historical tornado archive.

E (Error) (tornado search table only) - A yellow box indicates that the tornado record contains a suspected error. A red box indicates that the tornado record contains an error and has been modified from the official source. Hover over the box for the error text.
Map/Forum (tornado search table only) - Clickable icons for further content related to a tornado.
State - The state or states affected by a tornado.
Fujita - The Fujita scale is an attempt to classify damage from a tornado. F0 being the least damaging, F5 the most. For 2007 and beyond, the Enhanced Fujita (EF) is given.
Fat. - The number of fatalities attributed to the tornado.
Inj. - The number of injuries attributed to the tornado.
Width - Width in yards. It is unclear if this indicates a maximum width or mean width.
Length - Length of tornado path in miles. Note the entire track length is not necessarily all on the ground (some tornadoes "hop and skip".)
Damage - Prior to 1996, this is a range by dollar amount. For 1996 and later, actual damage estimates are in millions.
Crop Loss - Added in 2007. Given in millions of dollars.
Lat/Lon - Contains two sets of coordinates:

  • Touchdown Latitude/Longitude - For single state tornadoes, and the overall record for multi-state tornadoes, the approximate touchdown location in decimal degrees. For the state specific records of multi-state tornadoes, entry point into the state in decimal degrees.
  • Liftoff Latitude/Longitude - For single state tornadoes, and the overall record for multi-state tornadoes, the approximate liftoff location in decimal degrees. For the state specific records of multi-state tornadoes, the exit or lift-off point from the state in decimal degrees.

St. #. - The state tornado number assigned to the tornado for that specific state for that specific year. Generally, state tornado numbers were assigned in the order the tornado occurred, but that is not always the case.
SPC # - The tornado number as assigned by the SPC. Tornado numbers are not unique and reset each year. Generally, tornado numbers were assigned in the order the tornado occurred, but that is not always the case.

Tornado Summary

Date (y/m/d)TimeFujitaFatalitiesInjuriesWidthLengthDamageCrop LossTouchdown Lat/LonLiftoff Lat/LonSPC #State #
1991-04-2619:10:00 34124170032$500K-$5M-36.17 / -96.5236.38 / -96333
Affected StatesAffected Counties
Oklahoma Pawnee, Osage
User Comments   (38)      
General Comment
2017-05-05 11:23:03
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cobber2076
Posts:1
Rank: F0

The path shown on this map is incorrect.  My parents live in Ridgemont Estates, which was devastated by the tornado; this path shown doesn't touch their neighborhood.  The first leg should go from its current start point to cross 48 about a half-mile south of 412 and then cross 412 about a half-mile east of the 48-412 intersection.  The next leg should parallel 412 to the north through the Westport Airpark (on Old Keystone Road just north of 412) and into/through Ridgemont Estates, where the tornado went through the center of the neighborhood (roughly along Lakewood Drive) SW to NE.  The final leg should shift more to the left than it is now to be closer to New Prue.  See the following account from the National Weather Service office in Norman, OK.  Bold font indicates where adjustments to the mapped path should be made:


"Tornado B2 went along a 32-mile path from 1.5 miles west-southwest of Terlton to 1 mile north-northwest of Skiatook. It began at 7:10 pm CST and ended at 8:27 pm CST. The tornado narrowly missed the town of Terlton as it moved east-northeast. Northeast of Terlton and west of State Highway 48, the tornado was weak (F0 damage to trees.) As the tornado crossed Highway 48 a half mile south of the Cimarron Turnpike, it strengthened with F1 and F2 intensity damage to structures and power poles. Up to that point it had been one-eighth mile in width.


After crossing Highway 48, the tornado widened rapidly to about 1 mile and intensity increased to F4 damage as it crossed the turnpike. Several cars were swept off the turnpike with five injuries and one fatality. A man was killed when his car was overturned. The tornado then crossed into the Keystone Airpark at 7:30 pm CST and caused significant damage to four hangers, and seven aircraft were destroyed. Two of the planes were tossed into trees. The fire station at the airport was demolished, with one of the fire engines pushed across the runway and flung into an area of trees about 0.25 mile away. The Ridgemont Estates Subdivision 1 mile east of Westport was hard hit, with F4 damage to homes and trees.


In the Westport area, 54 homes were completely demolished, 8 homes suffered substantial damage, and 32 homes suffered minor damage. Also destroyed were 70 vehicles, 5 mobile homes, 18 outbuildings, and 3 travel trailers. The community center at Westport also suffered damage. There were no fatalities and no reported injuries at Westport. The tornado was 400-yards wide in the Westport area.


The tornado crossed Keystone Lake into Osage County at 7:44 pm CST, and briefly lifted in the vicinity of New Prue. The tornado then touched down again east-northeast of New Prue O.5 miles southwest of the John Zink Scout Ranch and destroyed the lodge there, where a group of Girl Scouts had taken cover. There were no reported injuries among the scouts. All trees along the path of the tornado were snapped off or uprooted, as it continued to the northeast, to the extreme south edge of Skiatook Lake, where some boat docks and a marina were damaged.


The tornado continued to 1.5 miles west of Skiatook on Highway 20 where there was damage to a propane company at 8:15 pm CST. The tornado moved on to a subdivision 1 mile west-northwest of Skiatook. In this area 32 homes were destroyed, 11 homes suffered major damage, and 45 homes suffered minor damage. There were 19 injuries in the Skiatook area. The damage was rated at F3 intensity. The tornado continued northeast for a short time and lifted at 8:27 pm CST, shortly before crossing the Tulsa County line. Damage was estimated from this storm at close to $3 million."

 

Edited on 2017-05-05 11:29:11 by cobber2076

General Comment
2018-02-27 06:42:57
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Nucleartornado
Posts:339
Rank: F4

cobber2076 this path is based on nws info so therefore it will most likely not be changed

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2019-03-13 21:54:35
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