1999 Salt Lake City tornado

Meteorological synopsis

In Salt Lake Valley, the day began with calm but cloudy weather. As the day progressed, the clouds became steadily darker until nearly all light was obscured. Winds were still nearly calm, with the exception of a few microbursts. Hail preceded and followed this tornado, which was rated a strong F2 on the Fujita scale. At 12:41 p.m., 1+1/2 in diameter hail was reported near the town of Herriman. Afterwards, the storm started rotating, and at around 1:00 pm, many people reported seeing the storm rotate as it moved into downtown Salt Lake City. A non-descending funnel cloud developed and traveled from western downtown toward the northeast before terminating near Memory Grove Park upon reaching the base of the Wasatch Mountains. The tornado remained on the ground for about 14 minutes over the span of about 4.25 mi.

Damage

The tornado damaged or destroyed approximately 800–1,000 trees and destroyed temporary tents set up for the Outdoor Retailers Association convention, claiming the life of one booth set-up supervisor, Allen Crandy, 38, of Las Vegas. In The Avenues, over 154 homes were severely damaged, about 120 of which had roofs blown off. Over 100 people were reported injured and a dozen critically. In total, 300 buildings were damaged or destroyed.

At the Delta Center, home of the Utah Jazz of the National Basketball Association, the tornado shattered windows and tore off part of the roof. Almost all of the windows from the nearby Wyndham Hotel (now the Radisson Hotel), across the street from the temporary tents, were broken out, raining down shards of glass on people attempting to escape from the collapsed tents. A crane toppled at the LDS Conference Center that was under construction. Damage to historic buildings in the lower Capitol Hill area of Salt Lake was reported. Nearly all of the trees in Memory Grove, a World War I memorial park at the mouth of City Creek Canyon near downtown, were reportedly torn out, as well as hundreds of old trees on the Capitol grounds.

This was the first major tornado to occur in a large urban area's downtown district and strike buildings of nearly 500 ft tall, according to Bill Alder of the National Weather Service. It happened in an area of the U.S. where tornadoes of this strength are relatively rare. The tornado caused approximately $170 million in damage.

References

References

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2. (August 11, 2016). "Throwback Thursday: A huge tornado ripped through SLC 17 years ago".
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4. Clayton Brough. (June 26, 2007). "Utah's Tornadoes & Waterspouts – 1847 to the present". National Weather Service.
5. "Tornado History Project: 19650209.49.1".
6. Arave, Lynn. (2002-09-11). "Tornadoes in Utah aren't all that rare".
7. Bauman, Joe. (1999-08-27). "Tornado was too fast for warning, Alder says Deadly twister suddenly 'blew up right over valley'".
8. (August 11, 2014). "Photos: 15 years since F2 tornado tore through downtown Salt Lake City".
9. "Deadly tornado hit downtown Salt Lake 15 years ago".
10. (August 13, 2018). "That time a tornado tore through Salt Lake City". Nexstar Broadcasting, Inc..
11. "National Weather Service – NWS Salt Lake City". Wrh.noaa.gov.