Pima County Natural Disasters and Weather Extremes
The chance of earthquake damage in Pima County is about the same as Arizona average and is much lower than the national average. The risk of tornado damage in Pima County is about the same as Arizona average and is much lower than the national average.
Earthquake Index, #14
| Pima County | 0.01 |
| Arizona | 0.13 |
| 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, #9
| Pima County | 0.0001 |
| Arizona | 0.0015 |
| 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, #3
| Pima County | 18.50 |
| Arizona | 22.18 |
| 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 2,247 other weather extremes events within 50 miles of Pima 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: | 1 | Dense Fog: | 2 | Drought: | 0 |
| Dust Storm: | 16 | Flood: | 404 | Hail: | 285 | Heat: | 1 | Heavy Snow: | 28 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 0 | Landslide: | 0 | Strong Wind: | 13 |
| Thunderstorm Winds: | 1,211 | Tropical Storm: | 0 | Wildfire: | 6 | Winter Storm: | 9 | Winter Weather: | 0 |
| Other: | 270 | ||||||||
Volcanos Nearby
A total of 1 volcano is found in or near Pima County.
| Distance (miles) | Name | Region | Latitude | Longitude | Elevation (foot) | Type | Status | Last Eruption |
| 103.4 | Pinacate | Mexico, Mexico | 31.772 | -113.498 | 1200 | Cinder cone | Holocene | Undated, but probable Holocene eruption |
Historical Earthquake Events
No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Pima County.
No historical earthquake events found in or near Pima County.
Historical Tornado Events
A total of 2 historical tornado events that had recorded magnitude of 2 or above found in or near Pima County.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 45.1 | 1964-08-27 | 2 | 32°12'N / 111°01'W | 2 | 9 | 25K | 0 | Pima | |||
| 48.1 | 1994-07-28 | 2 | 32°23'N / 111°01'W | 2.00 Miles | 25 Yards | 0 | 0 | 500K | 0 | Pima | |
| Brief Description: A tornado touched down on the Hill Top area of northwest Tucson. The tornado travelled in a west-northwest direction, and its width varied from about a yard to 50 yards. The 7700 blocks of Soledad and Redwing Circle were particularly hit hard. A back porch and much of the roof of one home was destroyed, an entire roof was removed from another house and scattered in nearby yards, two large evaporative coolers were thrown into a backyard swimming pool, and large trees were uprooted. Also, cars were damaged by flying debris, windows were shattered, and a brick wall was flattened. | |||||||||||
* 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.