St. Lawrence County tornado history

11 tornadoes touched St. Lawrence County, New York between 1950 and 2025 — about 0.1 a year. The strongest was rated F2 (Aug 15, 1986). Tornadoes here killed 1 and injured 4 people.

11tornadoes since 1950

F2strongest rating

1killed · 4 injured

5 milongest path · 1985

(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5· dots = start point only

By rating

(E)F06

(E)F13

(E)F22

(E)F30

(E)F40

(E)F50

By month

JFMAMJJASOND

Peak month: August.

By decade

’50’60’70’80’90’00’10’20

Strongest tornadoes

Date	Rating	Path	Width	Injured	Killed
Aug 15, 1986	F2	0.2 mi	10 yd	3	1
Sep 19, 1954	F2	0.1 mi	10 yd	0	0
May 31, 1985	F1	5 mi	50 yd	0	0
Aug 7, 1972	F1	4.9 mi	30 yd	0	0
Jul 10, 1989	F1	1.7 mi	30 yd	1	0
Jun 9, 2004	F0	2 mi	350 yd	0	0
Aug 9, 1988	F0	0.5 mi	17 yd	0	0
Jul 24, 1987	F0	0.4 mi	10 yd	0	0
Jun 21, 1993	F0	0.4 mi	20 yd	0	0
Jun 9, 2004	F0	0.2 mi	100 yd	0	0
Aug 11, 2024	EF0	0.1 mi	20 yd	0	0

Most recent tornadoes

Date	Rating	Path	Width	Injured	Killed
Aug 11, 2024	EF0	0.1 mi	20 yd	0	0
Jun 9, 2004	F0	2 mi	350 yd	0	0
Jun 9, 2004	F0	0.2 mi	100 yd	0	0
Jun 21, 1993	F0	0.4 mi	20 yd	0	0
Jul 10, 1989	F1	1.7 mi	30 yd	1	0
Aug 9, 1988	F0	0.5 mi	17 yd	0	0
Jul 24, 1987	F0	0.4 mi	10 yd	0	0
Aug 15, 1986	F2	0.2 mi	10 yd	3	1
May 31, 1985	F1	5 mi	50 yd	0	0
Aug 7, 1972	F1	4.9 mi	30 yd	0	0
Sep 19, 1954	F2	0.1 mi	10 yd	0	0

Deadliest: Aug 15, 1986, F2, 1 killed.

Nearby counties

Franklin County, NY2 Lewis County, NY8 Jefferson County, NY5 Hamilton County, NY7 Herkimer County, NY11 Essex County, NY3 Clinton County, NY2 Oneida County, NY33

Questions

How many tornadoes has St. Lawrence County, New York had?

11 tornadoes touched St. Lawrence County, New York between 1950 and 2025 in the NOAA Storm Prediction Center database — about 0.1 per year.

What was the strongest tornado in St. Lawrence County?

The strongest rating recorded was F2 on Aug 15, 1986, with a 0.2-mile path and 1 deaths.

When is tornado season in St. Lawrence County?

Most of its tornadoes happened in August (4 of 11). Tornadoes can occur in any month, so keep alerts on year-round.

Right now: live tornado warnings map · alerts for your location. Dates link to that day’s full storm reports where available (2004 onward).