Lewis County Natural Disasters and Weather Extremes
The chance of earthquake damage in Lewis County is lower than New York average and is lower than the national average. The risk of tornado damage in Lewis County is lower than New York average and is much lower than the national average.
Earthquake Index, #23
| Lewis County | 0.33 |
| New York | 0.58 |
| U.S. | 1.81 |
The earthquake index value is calculated based on historical earthquake events data using USA.com algorithms. It is an indicator of the earthquake level in a region. A higher earthquake index value means a higher chance of an earthquake.
Volcano Index, #1
| Lewis County | 0.0000 |
| New York | 0.0000 |
| U.S. | 0.0023 |
The volcano index value is calculated based on the currently known volcanoes using USA.com algorithms. It is an indicator of the possibility of a region being affected by a possible volcano eruption. A higher volcano index value means a higher chance of being affected.
Tornado Index, #55
| Lewis County | 14.52 |
| New York | 49.25 |
| U.S. | 136.45 |
The tornado index value is calculated based on historical tornado events data using USA.com algorithms. It is an indicator of the tornado level in a region. A higher tornado index value means a higher chance of tornado events.
Other Weather Extremes Events
A total of 5,854 other weather extremes events within 50 miles of Lewis County were recorded from 1950 to 2010. The following is a break down of these events:
| Type | Count | Type | Count | Type | Count | Type | Count | Type | Count |
| Avalanche: | 0 | Blizzard: | 1 | Cold: | 63 | Dense Fog: | 0 | Drought: | 12 |
| Dust Storm: | 0 | Flood: | 714 | Hail: | 995 | Heat: | 16 | Heavy Snow: | 313 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 19 | Landslide: | 0 | Strong Wind: | 90 |
| Thunderstorm Winds: | 3,191 | Tropical Storm: | 0 | Wildfire: | 0 | Winter Storm: | 95 | Winter Weather: | 37 |
| Other: | 308 | ||||||||
Volcanos Nearby
No volcano is found in or near Lewis County.
Historical Earthquake Events
A total of 1 historical earthquake event that had a recorded magnitude of 3.5 or above found in or near Lewis County.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 18.9 | 1980-06-06 | 3.8 | 1 | 43.56 | -75.23 |
Historical Tornado Events
A total of 3 historical tornado events that had recorded magnitude of 2 or above found in or near Lewis County.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 21.6 | 1983-05-02 | 3 | 43°29'N / 75°22'W | 43°29'N / 75°18'W | 3.00 Miles | 450 Yards | 0 | 0 | 25.0M | 0 | Oneida |
| 34.9 | 1986-08-15 | 2 | 44°17'N / 75°34'W | 0.20 Mile | 10 Yards | 1 | 3 | 250K | 0 | St. Lawrence | |
| 41.1 | 1990-07-23 | 2 | 43°08'N / 75°35'W | 43°15'N / 75°16'W | 17.00 Miles | 77 Yards | 0 | 0 | 25K | 0 | Oneida |
* The information on this page is based on the global volcano database, the U.S. earthquake database of 1638-1985, and the U.S. Tornado and Weather Extremes database of 1950-2010.