|Date:||July 21, 1987|
|Damages:||$2.5 million USD|
|Area affected:||Teton Wilderness
Yellowstone National Park
The Teton–Yellowstone tornado was a rare high-altitude tornado which occurred on July 21, 1987 in the U.S. State of Wyoming. Rated at F4 on the Fujita scale, it was the strongest tornado ever recorded in the state. The tornado cut through a 24-mile (39 km)Template:Convert/track/adj/on long, 1.5-mile (2.4 km)Template:Convert/track/adj/on wide swath of the Teton Wilderness and Yellowstone National Park, and even crossed the Continental Divide. The damage occurred at elevations ranging from 8,500 to 10,000 feet (2,600 to 3,000 m), making it the highest altitude violent tornado recorded in the United States. No human fatalities or injuries were recorded, but up to 1,000,000 trees were uprooted by the storm. Most of the damaged forest later burned in the Yellowstone fires of 1988.
- "Wyoming Climate Atlas". Wyoming State Climate Office. http://www.wrds.uwyo.edu/sco/climateatlas/severe_weather.html. Retrieved 21 December 2009.
- Edwards, Roger (29 January 2009). "The Online Tornado FAQ". National Weather Service. http://www.spc.noaa.gov/faq/tornado/. Retrieved 21 December 2009.
- Fujita, T. Theodore (September 1989). "The Teton-Yellowstone Tornado of 21 July 1987". Monthly Weather Review (American Meteorological Society) 117 (9): 1913–1940. Bibcode 1989MWRv..117.1913F. doi:10.1175/1520-0493(1989)117<1913:TTYTOJ>2.0.CO;2. http://ams.allenpress.com/perlserv/?request=get-abstract&doi=10.1175%2F1520-0493%281989%29117%3C1913%3ATTYTOJ%3E2.0.CO%3B2&ct=1. Retrieved 21 December 2009.
- "NWS Riverton WY - Tornado Inforamtion". National Weather Service. http://www.crh.noaa.gov/riw/severe/tornado.php. Retrieved 21 December 2009.
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