Boulder regional and Colorado Tornado information tornadoimg

Local tornadoes and funnel clouds from 1953 to present (list not complete):


YEAR MON DAY TIME MAG TYPE COMMENTS AND LOCATION
1953 Sep 17 1500 F1 tornado Boulder county .1 mile 15' wide
1955 May 12 1545 F1 tornado Boulder county .1 mile 45' wide
1968 Jul 19 funnel over Westminster
1975 Jun 23 1340 funnel S of Boulder
1975 Jun 23 1405 funnel E or SE Boulder
1976 Jun 4 tornado 8m se Longmont 8minutes touchdown
1976 Jun 4 tornado 1 1/2 miles east Lafayette brief touchdown
1978 May 17 1545 F1 tornado north of Longmont 1/2 mile path; 15 yards
1979 May 21 1500 funnel 10miles NE Boulder
1980 Apr 30 1100 F2 tornado Boulder County 5.7 miles 6' wind
1980 Oct 15 1822 F2 tornado Boulder County 1.5 miles wide near 6500 Arapahoe
1982 Jul 9 1310 F1 tornado 2 small tornadoes east of Rocky Flats
1988 Jun 5 1425 F2 tornado between and Broomfield .5mi 50ft
1990 Jun 1 1603 F0 tornado between Lafayette and Longmont .2miles path; 20 yards wide
1991 Jun 1 1700 funnel Longmont
1991 Jun 1 1616 funnel Boulder
1995 Jun funnel Lafayette
1996 Jun 16 1615 1635 F1 tornado 1.5 miles 300' Pinecliff (west Boulder)
1996 Jul 12 1940 1944 F0 tornado .1 miles Broomfield
1997 Jun 6 1315 F1 tornado east Boulder (near Baseline)
2015 Jun 4 1530 EF3 tornado 5.84 miles Highland (near Lyons)
2021 Jun 7 1700 EF1 tornado Near East Longmont

Tornadoes in Colorado 1953-1990


Total:		826
Average/year	 21
Greatest         58   (in 1982)
Least             1   (in 1959)
#/10,000 sq mi 2.01
Days            480
average days     12
# deaths          2

 

Tornadoes per month in Colorado


MonthAverage
January 0.0
February 0.5
March 2.3
April 7.0
May 19.2
June 17.2
July 5.0
August 2.7
September 2.0
October 1.9
November 1.7
December 0.3
[Period of record 1953-1970]

Diurnal timing of tornadoes in Colorado


Hour of day
 0:X                                     0.3
 1:XX                                    0.8
 2:XX                                    1.0
 3:                                      0.1
 4:                                      0.1
 5:                                      0.0
 6:                                      0.0
 7:                                      0.1
 8:                                      0.1
 9:                                      0.0
10:X                                     0.3
11:X                                     0.8
12:XXXX                                  2.0
13:XXXX                                  2.1
14:XXXXXXXXXXXX                          5.8
15:XXXXXXXXXXXXXXXXXXXXXXXXXXXXX        14.1
16:XXXXXXXXXXXXXXXXXXXXXXXXXXXXX        14.3
17:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX    16.8
18:XXXXXXXXXXXXXXXXXXXXXXXXX            12.5
19:XXXXXXXXXXXXXXXXXXXX                 10.0
20:XXXXXXXXXXXX                          6.2
21:XXXXXXXXXXXXX                         6.5
22:XXXXXXX                               3.5
23:XXX                                   1.3
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