Geoscience Reference
In-Depth Information
Edmonton, Alberta
Illinois
Southern Ontario
Topeka, Kansas
Tornadoes per year
3
1
Irving, Kansas
Xenia, Ohio
2
2
5
4
1
3
Oklahoma City
Judsonia, Arkansas
4
Alabama
5
6
Rocksprings, Texas
>7
0
1000 km
Average number of tornadoes per year and preferred path of movement in the continental United States (adapted from Miller, 1971).
Fig. 4.12
greatest number in one day occurred on 29 March 1974
(274 reports). However, these trends must be set within
the context of variability from year to year. The 2003
season mentioned above occurred following a year that
witnessed the fewest tornadoes - adjusted for increased
report trends - in 50 years.
Canada now experiences the second largest number
of tornadoes: 100-200 events annually as far north as
800
Deaths
1600
Number Of Tornadoes
1400
600
1200
1000
400
800
600
200
400
200
0
0
1920
1930
1940
1950
1960
1970
1980
1990
2000
Year
Number of tornadoes and deaths due to tornadoes in the United States between 1916 and 2002 (U.S. Severe Weather Meteorology and
Climatology, 2002a, b).
Fig. 4.13
