Early and Late Season Tornado Events

 While tornadoes can occur during any month of the year given the right combination of atmospheric parameters, the tables below illustrate that tornado activity in the Tri-State region is rare to non-existent during the colder months.  The earliest tornado on record (spring season) occurred on March 8, 1992 when an EF0 tornado developed in Dundy county, Nebraska.  Most of the early season tornadoes have occurred in late March.  While tornado records since 1950 are fairly reliable, information prior to that is less certain.  In his book, Significant Tornadoes 1680-1991, Thomas Grazulis extensively researched tornadoes prior to 1950, documenting significant tornadoes (EF2-EF5). 

In the first table below, early season tornadoes are listed.  Since the only accurate compilation of tornadoes prior to 1950 are those rated EF2 and above, there may in actuality be additional tornadoes which have occurred in March and April.  All tornadoes prior to 1950 are shaded in yellow to highlight this fact.  Event totals for these events are not given, since it is unknown what the total number of tornadoes may have been.  

 

Earliest Tornadoes (Mar-Apr) in the Tri-State Area ... 1882-2012 

#
Date
County
Num - FScale
Event Total
1
03/08/1992
Dundy
1-F0
1
2
03/13/1973
Sherman
1-F1
1
3
03/24/2007
Yuma
1-F0
1
4
03/25/1980
Cheyenne, CO
1-F1
1
5
03/25/1995
Wichita
1-F0
1
6
03/28/1981
Logan
Sheridan
1-F1
1-F1
2
7
03/28/1993
Decatur
Norton
1-F0
2-F1
3
8
03/28/2007
Dundy
Wallace
Decatur
Sherman
Greeley
Cheyenne, KS
1-F1
3-F0, 1-F1
1-F0
5-F0, 1-F2
2-F0, 1-F1
1-F0, 2-F1, 1-F2
16
9
03/31/1954
Yuma
1-F?
1
10
04/08/1978
Red Willow
1-F?
1
11
04/10/2005
Graham
1-F0, 1-F1
2
12
04/12/1941
Sherman
Wallace
Dundy
1-F2
1-F3
2-F2
 
13
04/12/2012
Hitchcock
1-EF0
1
14
04/13/2010
Kit Carson
1-EF0
1
15
04/14/1998
Decatur
1-F0, 3-F1
4
16
04/19/1957
Hitchcock
1-F1
1
17
04/19/1979
Graham
1-F2
1
18
04/19/1997
Logan
1-F0
1
19
04/20/1885
Decatur
1-F2
 
20
04/20/1974
Rawlins
1-F1
1
21
04/22/1957
Kit Carson
Hitchcock
1-F2
1-F?
2
22
04/22/2012
Cheyenne, CO
Gove
5-EF0
1-EF0
6
23
04/23/1922
Wichita
1-F2
 
24
04/23/1989
Norton
3-F0
3
25
04/25/1882
Dundy
1-F2
 
26
04/25/1990
Gove
Red Willow
1-F0
1-F0
2
27
04/26/1938
Kit Carson
Graham
1-F2
1-F2
 
28
04/27/1912
Red Willow
1-F2
 
29
04/27/1958
Rawlins
1-F2
1
30
04/28/1884
Decatur
1-F2
 
31
04/28/1940
Norton
2-F2
 
32
04/28/1947
Sheridan-Thomas
F3
 
33
04/29/1942
Decatur
F5
 
34
04/29/1997
Thomas
1-F0
1
35
04/30/1906
Decatur
F3
 
 

Yellow shading represents data prior to 1950 and only includes significant tornadoes (EF2+).
Since 1950, for dates April 30 or earlier, there have been 24 tornado days (producing 55 tornadoes).
Since 1882, for dates April 30 or earlier, there have been at least 35 tornado days.
 

 


 

Late season tornado events are shown below.  The only tornado on record in November in the Tri-State area occurred in Yuma county Colorado in 1922.  That fact is interesting enough, but considering the tornado occurred at 9:30 in the morning makes the event even more noteworthy.  Once again, only those tornadoes rated EF2 and above are included prior to 1950, and are highlighted in yellow.  

Latest Tornadoes (Oct-Nov) in the Tri-State Area ... 1882-2012

 
#
Date
County
Num-F Scale
Event Total
1
11/04/1922
Yuma
1-F3
1
2
10/31/2000
Decatur
Rawlins
Sheridan-Thomas-Decatur
Sherman
Thomas
Wallace-Sherman
Red Willow
1-F1
1-F0
1-F0
2-F0, 1-F2
1-F0
1-F1
2-F0
10
3
10/29/1956
Thomas
1-F2
1
4
10/28/2000
Gove
Graham
Norton
Sheridan
2-F1
2-F0
1-F0
1-F0
6
5
10/20/1963
Yuma
1-F1
1
6
10/17/1971
Cheyenne, KS
Rawlins
Yuma
1-F2
1-F3
1-F2
3
7
10/11/1997
Kit Carson
1-F1
1
8
10/11/2008
Sherman
1-EF0
1
9
10/08/1997
Kit Carson
Yuma
2-F0
2-F0
4
10
10/06/2011
Thomas
1-EF1
1
11
10/05/1994
Cheyenne, CO
Kit Carson
1-F0
1-F0, 1-F1, 1-F2
4


Yellow shading represents data prior to 1950 and only includes significant tornadoes (EF2+). 
Since 1950, for dates October 1 or later, there have been 10 tornado days, producing 32 tornadoes.
Since 1882, for dates October 1 or later, there have been at least 11 tornado days.

  


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