Forest Grove, OR Natural Disasters and Weather Extremes
The chance of earthquake damage in Forest Grove is lower than Oregon average and is lower than the national average. The risk of tornado damage in Forest Grove is about the same as Oregon average and is much lower than the national average.
Earthquake Index, #90
| Forest Grove, OR | 0.40 |
| 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, #258
| Forest Grove, OR | 0.0123 |
| 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, #70
| Forest Grove, OR | 17.00 |
| 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 354 other weather extremes events within 50 miles of Forest Grove, OR 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: | 0 | Dense Fog: | 0 | Drought: | 0 |
| Dust Storm: | 0 | Flood: | 87 | Hail: | 32 | Heat: | 0 | Heavy Snow: | 5 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 0 | Landslide: | 0 | Strong Wind: | 21 |
| Thunderstorm Winds: | 33 | Tropical Storm: | 0 | Wildfire: | 1 | Winter Storm: | 0 | Winter Weather: | 0 |
| Other: | 175 | ||||||||
Volcanos Nearby
A total of 7 volcanoes are found in or near Forest Grove, OR.
| Distance (miles) | Name | Region | Latitude | Longitude | Elevation (foot) | Type | Status | Last Eruption |
| 55.4 | West Crater | US-Washington, United States | 45.88 | -122.08 | 1329 | Volcanic field | Radiocarbon | Last known eruption B.C. (Holocene) |
| 64.6 | St. Helens | US-Washington, United States | 46.2 | -122.18 | 2549 | Stratovolcano | Historical | Last known eruption 1964 or later |
| 68.2 | Indian Heaven | US-Washington, United States | 45.93 | -121.82 | 1513 | Shield volcano | Radiocarbon | Last known eruption B.C. (Holocene) |
| 69.4 | Hood | US-Oregon, United States | 45.374 | -121.694 | 3426 | Stratovolcano | Historical | Last known eruption 1800-1899 |
| 85.9 | Jefferson | US-Oregon, United States | 44.692 | -121.8 | 3199 | Stratovolcano | Varve Count | Last known eruption A.D. 1-1499 |
| 91.0 | Adams | US-Washington, United States | 46.206 | -121.49 | 3742 | Stratovolcano | Tephrochronology | Last known eruption A.D. 1-1499 |
| 97.8 | Sand Mountain Field | US-Oregon, United States | 44.38 | -121.93 | 1664 | Cinder cone | Radiocarbon | Last known eruption B.C. (Holocene) |
Historical Earthquake Events
A total of 5 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Forest Grove, OR.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 19.3 | 1964-10-01 | 5.3 | N/A | 45.7 | -122.8 |
| 22.5 | 1962-11-06 | 4.8 | N/A | 45.63 | -122.67 |
| 47.1 | 1963-03-07 | 4.6 | N/A | 44.9 | -123.5 |
| 18.5 | 1963-12-27 | 4.5 | N/A | 45.7 | -123.4 |
| 47.4 | 1984-06-04 | 3.7 | 53 | 46.21 | -123.06 |
Historical Tornado Events
A total of 3 historical tornado events that had recorded magnitude of 2 or above found in or near Forest Grove, OR.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 23.7 | 1972-04-05 | 3 | 45°36'N / 122°38'W | 45°36'N / 122°38'W | 0 | 0 | 250K | 0 | Multnomah | ||
| 28.2 | 1972-04-05 | 3 | 45°36'N / 122°38'W | 45°38'N / 122°27'W | 8.70 Miles | 440 Yards | 6 | 300 | 25.0M | 0 | Clark |
| 48.9 | 2010-12-14 | 2 | 44°50'N / 122°52'W | 44°51'N / 122°49'W | 5.00 Miles | 150 Yards | 0 | 2 | 1.2M | 0K | Marion |
| Brief Description: EVENT NARRATIVE: On December 14th at 11:40 AM PST, a tornado with an Enhanced Fujita Scale rating of EF2 moved northeast across the community of Aumsville, Oregon. The estimated length of the tornado path was 5 miles with a width of 150 yards. There were two minor injuries, fifty structures damaged, more than thirty large trees blown down or snapped off, five sheds damaged and two semi-trailers tipped over. The estimated value of the damage was $1.2 million. EPISODE NARRATIVE: A strong cold pool of air aloft produced a very unstable airmass over western Oregon. A vigorous low pressure center was just off the Washington Coast with a surface trough moving through western Oregon. This trough served as a focus for thunderstorms during the day. One of these thunderstorms produced a tornado that wreaked havoc on the community of Aumsville. | |||||||||||
* 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.