https://www.nssl.noaa.gov/users/brooks/public_html/papers/lengthwidth.pdf
And will give some examples.
Text:
The width in the header-strip is the maximum observed through the entire length of a tornado, or of each segment in a multi-segment tornado. Generally, in the absence of structural damage, broken small tree branches of at least 3 inches in diameter can be considered as a marker for tornado width (assuming this damage isn’t related to the rear flank downdraft). In arid regions where there is a lack of trees, other vegetation or landscape material will have to be used as a marker. To determine the tornado's maximum width, the Storm Prediction Center or Storm Data user must check each segment which is entered as a separate event.
The preparer is encouraged to include in the event narrative the average path width (in yards) of all tornadoes, especially for strong or violent tornadoes (EF2 damage or worse). Availability of average path width information in Storm Data benefits the scientific research community and other users.
So among the top few widest ones, says wikipedia are:
- Bassfield / Soso, Mississippi, in 2020. Was over 2 miles wide.
- Weather.com says this is the 3rd largest "documented" tornado ever. Wikipedia I guess disagrees, so it must be the documentation/proof part of it.
- This is the aftermath we drove through when traveling to Tenn. that year. Huge devastation across the trees around the highways.
- https://weather.com/safety/tornado/news/2020-04-16-mississippi-tornado-widest-state-record-easter-sunday
- Only two larger tornadoes have been documented.
- A deadly Easter Sunday tornado in Mississippi shattered a state size record and was among the largest twisters documented in the United States
- The tornado, rated EF4, carved a 68-mile-long path through parts of five Mississippi counties, from Jefferson Davis County to Clarke County, according to the National Weather Service office in Jackson, Mississippi.
- Sorry, not sure who to credit for photo.
- Mulhall(?), cousin to the famous Bridge Creek-Moore tornado.
- On May 3, 1999, a Doppler On Wheels (DOW) mobile radar observed an F4 tornado as it crossed Mulhall during the 1999 Oklahoma Tornado Outbreak, which also produced the Bridge Creek-Moore tornado. The DOW documented the largest-ever-observed core flow circulation with a distance of 1,600 m (5,200 ft) between peak velocities on either side of the tornado, and a roughly 7 km (4.3 mi) width of peak wind gusts exceeding 43 m/s (96 mph), making the Mulhall tornado the largest tornado ever measured quantitatively (((I guess this means, via radar and no visual clues))).
- Sorry, don't know who to credit for photo.
- Timber Lake (never heard of via youtube, since no video, eh)
- On April 21, 1946, a tornado struck the area in and around Timber Lake, South Dakota. The U.S. Weather Bureau published a paper in 1946 stating the width of this tornado was 4 miles (6.4 km), which would make this the widest tornado ever documented in history. However, this is outside the period of reliable documentation accepted by the National Weather Service; 1950–present.[58]
- The El Reno 2013 terrible crazy monster one. Wikiped says:
- Officially, the widest tornado on record is the El Reno, Oklahoma tornado of May 31, 2013 with a width of 2.6 miles (4.2 km) at its peak. This is the width found by the National Weather Service based on preliminary data from University of Oklahoma RaXPol mobile radar that also sampled winds of 296 mph (476 km/h) which was used to upgrade the tornado to EF5.[51] However, it was revealed that these winds did not impact any structures, and as a result the tornado was downgraded to EF3 based on damage.
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