Harrisburg School District 7J Natural Disasters and Weather Extremes
The chance of earthquake damage in Harrisburg School District 7J is lower than Oregon average and is much lower than the national average. The risk of tornado damage in Harrisburg School District 7J is about the same as Oregon average and is much lower than the national average.
Earthquake Index, #129
| Harrisburg School District 7J | 0.05 |
| 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, #78
| Harrisburg School District 7J | 0.0191 |
| 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, #73
| Harrisburg School District 7J | 7.07 |
| 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 167 other weather extremes events within 50 miles of Harrisburg School District 7J 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: | 1 |
| Dust Storm: | 0 | Flood: | 38 | Hail: | 19 | Heat: | 0 | Heavy Snow: | 0 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 0 | Landslide: | 0 | Strong Wind: | 2 |
| Thunderstorm Winds: | 19 | Tropical Storm: | 0 | Wildfire: | 7 | Winter Storm: | 0 | Winter Weather: | 0 |
| Other: | 81 | ||||||||
Volcanos Nearby
A total of 10 volcanoes are found in or near Harrisburg School District 7J.
| Distance (miles) | Name | Region | Latitude | Longitude | Elevation (foot) | Type | Status | Last Eruption |
| 59.2 | Sand Mountain Field | US-Oregon, United States | 44.38 | -121.93 | 1664 | Cinder cone | Radiocarbon | Last known eruption B.C. (Holocene) |
| 63.1 | Belknap | US-Oregon, United States | 44.285 | -121.841 | 2095 | Shield volcano | Radiocarbon | Last known eruption A.D. 1-1499 |
| 63.5 | Washington | US-Oregon, United States | 44.332 | -121.837 | 2376 | Shield volcano | Radiocarbon | Last known eruption A.D. 1-1499 |
| 67.1 | North Sister Field | US-Oregon, United States | 44.17 | -121.77 | 3074 | Complex volcano | Radiocarbon | Last known eruption A.D. 1-1499 |
| 67.4 | Blue Lake Crater | US-Oregon, United States | 44.42 | -121.77 | 1230 | Maar | Radiocarbon | Last known eruption B.C. (Holocene) |
| 67.8 | South Sister | US-Oregon, United States | 44.1 | -121.77 | 3157 | Complex volcano | Radiocarbon | Last known eruption B.C. (Holocene) |
| 71.2 | Jefferson | US-Oregon, United States | 44.692 | -121.8 | 3199 | Stratovolcano | Varve Count | Last known eruption A.D. 1-1499 |
| 73.7 | Bachelor | US-Oregon, United States | 43.979 | -121.688 | 2763 | Stratovolcano | Tephrochronology | Last known eruption B.C. (Holocene) |
| 80.6 | Davis Lake | US-Oregon, United States | 43.57 | -121.82 | 2163 | Volcanic field | Radiocarbon | Last known eruption B.C. (Holocene) |
| 87.0 | Cinnamon Butte | US-Oregon, United States | 43.241 | -122.108 | 1956 | Cinder cone | Holocene | Unknown |
Historical Earthquake Events
A total of 2 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Harrisburg School District 7J.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 47.4 | 1963-03-07 | 4.6 | N/A | 44.9 | -123.5 |
| 42.6 | 1961-08-19 | 4.5 | N/A | 44.7 | -122.5 |
Historical Tornado Events
A total of 1 historical tornado event that had recorded magnitude of 2 or above found in or near Harrisburg School District 7J.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 41.8 | 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.