COMET Case Study 025: Salt Lake City Tornado/Long Island Flood 1999 Data at UCAR/JOSS/NOAA/CODIAC

Case 025 represents one of the most devastating weather events in
Utah's history. On August 11th 1999 a tornado moved through downtown
Salt Lake City between 18:45 and 18:55 UTC. The tornado damage was
rated as F2 on the Fujita scale, and was resonsible for the first
recorded tornado death in the state's history and dozens of
injuries. Hail up to 1.5 inches in diameter was also reported from
this storm. In addition, on the East Coast, flash floods impacted Long
Island. Between 13Z and 17Z on August 11, clusters of thunderstorms
formed along a warm front. As they moved very slowly east, they
produced heavy rain that caused flash flooding from Deer Park to
Manorville, NY. Rainfall rates estimated at 1 to 2 inches per hour for
up to 3 hours generated rainfall totals from 3 to 5 inches. Water,
rapidly accumulating in low-lying areas, swept cars away and trapped
people in their vehicles.

For more information, see:
http://data.eol.ucar.edu/codiac/projs?COMET_CASE_025