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| | Tornado - Facts, Information, and Encyclopedia Reference article |
 | | The biggest tornado outbreak on record—with 148 tornadoes, including six F5 and 23 F4 tornadoes—occurred on April 3, 1974. |
 | | Another such significant storm system was the Palm Sunday Tornado Outbreak, which affected the United States Midwest on April 11, 1965. |
 | | The National Weather Service office based in Norman, Oklahoma, has created a presentation discussing the use of bridges as protection during the Oklahoma Tornado Outbreak that occurred on May 3, 1999, in the region of Oklahoma City where tornadoes passed over three different bridges—at least one person was killed in each instance. |
| www.startsurfing.com /encyclopedia/t/o/r/Tornado.html (1947 words) |
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