Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 48 Page 49 Page 50 Page 51 Page 52 Page 53 Page 54 Page 55 Page 56 Page 57 Page 58 Page 59 Page 60Tornado touchdowns (1950–2012) Ten highest tornado years 0 5 10 15 20 25 30 35 40 45 1976 1978 1979 1984 1990 1991 1997 1999 2008 2010 Tornados and other extreme weather events 18 Tornados can occur anywhere in Wyoming but are most common on the eastern plains due to the combination of several weather mechanisms, including low pressure systems and fronts. These conditions occur more frequently and intensely on the Great Plains than in other areas. The twisters pictured at left occurred near Pine Bluffs in May, 2010. Casper Cheyenne Cody Gillette Green River Jackson Lander Laramie Lusk Newcastle Rawlins Sheridan Sundance Wheatland 1985 record flood: Cheyenne highest non-storm winds: 120 mph Rendevous Peak 1988 record snowfall: 4 ft Sheridan 1955 uncontested record low: -63°F Mt. Moran 1933 1900 record high: 116°F Bitter Creek largest fire: Yellowstone N.P. 1988 Weather extremes Data Go Interactive