Gilliam County Natural Disasters and Weather Extremes
The chance of earthquake damage in Gilliam County is lower than Oregon average and is much lower than the national average. The risk of tornado damage in Gilliam County is about the same as Oregon average and is much lower than the national average.
Earthquake Index, #26
| Gilliam County | 0.06 |
| Oregon | 0.62 |
| 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, #24
| Gilliam County | 0.0064 |
| Oregon | 0.0291 |
| 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, #27
| Gilliam County | 1.07 |
| Oregon | 8.38 |
| 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 667 other weather extremes events within 50 miles of Gilliam 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: | 0 | Cold: | 1 | Dense Fog: | 0 | Drought: | 2 |
| Dust Storm: | 2 | Flood: | 53 | Hail: | 248 | Heat: | 0 | Heavy Snow: | 4 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 0 | Landslide: | 0 | Strong Wind: | 9 |
| Thunderstorm Winds: | 191 | Tropical Storm: | 0 | Wildfire: | 42 | Winter Storm: | 0 | Winter Weather: | 0 |
| Other: | 115 | ||||||||
Volcanos Nearby
A total of 6 volcanoes are found in or near Gilliam County.
| Distance (miles) | Name | Region | Latitude | Longitude | Elevation (foot) | Type | Status | Last Eruption |
| 71.9 | Hood | US-Oregon, United States | 45.374 | -121.694 | 3426 | Stratovolcano | Historical | Last known eruption 1800-1899 |
| 83.8 | Adams | US-Washington, United States | 46.206 | -121.49 | 3742 | Stratovolcano | Tephrochronology | Last known eruption A.D. 1-1499 |
| 86.3 | Indian Heaven | US-Washington, United States | 45.93 | -121.82 | 1513 | Shield volcano | Radiocarbon | Last known eruption B.C. (Holocene) |
| 90.9 | Jefferson | US-Oregon, United States | 44.692 | -121.8 | 3199 | Stratovolcano | Varve Count | Last known eruption A.D. 1-1499 |
| 96.5 | West Crater | US-Washington, United States | 45.88 | -122.08 | 1329 | Volcanic field | Radiocarbon | Last known eruption B.C. (Holocene) |
| 101.1 | Blue Lake Crater | US-Oregon, United States | 44.42 | -121.77 | 1230 | Maar | Radiocarbon | Last known eruption B.C. (Holocene) |
Historical Earthquake Events
A total of 3 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Gilliam County.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 29.3 | 1976-04-13 | 4.6 | 15 | 45.22 | -120.77 |
| 35.4 | 1976-04-17 | 4.2 | 2 | 45.08 | -120.8 |
| 35.7 | 1985-02-10 | 3.9 | 18 | 45.7 | -119.63 |
Historical Tornado Events
No historical tornado events that had recorded magnitudes of 2 or above found in or near Gilliam County.
No historical earthquake events found in or near Gilliam County.
* 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.