Union County Natural Disasters and Weather Extremes
The chance of earthquake damage in Union County is about the same as Pennsylvania average and is much lower than the national average. The risk of tornado damage in Union County is lower than Pennsylvania average and is lower than the national average.
Earthquake Index, #38
| Union County | 0.02 |
| Pennsylvania | 0.17 |
| 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
| Union County | 0.0000 |
| Pennsylvania | 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, #42
| Union County | 86.46 |
| Pennsylvania | 109.77 |
| 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 11,211 other weather extremes events within 50 miles of Union 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: | 3 | Cold: | 73 | Dense Fog: | 23 | Drought: | 72 |
| Dust Storm: | 0 | Flood: | 1,625 | Hail: | 1,843 | Heat: | 115 | Heavy Snow: | 182 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 36 | Landslide: | 1 | Strong Wind: | 195 |
| Thunderstorm Winds: | 6,137 | Tropical Storm: | 1 | Wildfire: | 25 | Winter Storm: | 108 | Winter Weather: | 96 |
| Other: | 676 | ||||||||
Volcanos Nearby
No volcano is found in or near Union County.
Historical Earthquake Events
No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Union County.
No historical earthquake events found in or near Union County.
Historical Tornado Events
A total of 23 historical tornado events that had recorded magnitude of 2 or above found in or near Union County.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 13.3 | 1978-08-28 | 2 | 40°53'N / 76°52'W | 40°51'N / 76°48'W | 3.30 Miles | 50 Yards | 0 | 1 | 25K | 0 | Snyder |
| 13.5 | 1985-05-31 | 3 | 41°11'N / 77°09'W | 41°08'N / 76°58'W | 11.00 Miles | 910 Yards | 2 | 20 | 25.0M | 0 | Lycoming |
| 13.7 | 1985-05-31 | 3 | 41°08'N / 76°58'W | 41°09'N / 76°55'W | 4.00 Miles | 910 Yards | 2 | 20 | 25.0M | 0 | Union |
| 15.1 | 1985-05-31 | 3 | 41°09'N / 76°55'W | 41°07'N / 76°50'W | 4.00 Miles | 2640 Yards | 2 | 20 | 25.0M | 0 | Northumberland |
| 15.9 | 1978-08-28 | 2 | 40°51'N / 76°48'W | 40°52'N / 76°46'W | 0 | 0 | 25K | 0 | Northumberland | ||
| 17.6 | 1976-07-29 | 3 | 41°12'N / 77°16'W | 41°14'N / 76°47'W | 25.00 Miles | 150 Yards | 0 | 0 | 2.5M | 0 | Lycoming |
| 20.8 | 1980-04-09 | 2 | 40°44'N / 77°19'W | 40°43'N / 77°17'W | 0 | 0 | 250K | 0 | Snyder | ||
| 24.0 | 1966-08-16 | 2 | 41°18'N / 77°00'W | 41°18'N / 76°54'W | 4.50 Miles | 100 Yards | 0 | 1 | 25K | 0 | Lycoming |
| 29.7 | 1950-07-05 | 2 | 40°36'N / 76°45'W | 0 | 0 | 3K | 0 | Dauphin | |||
| 30.4 | 1953-09-12 | 2 | 40°40'N / 76°41'W | 40°39'N / 76°35'W | 4.70 Miles | 50 Yards | 0 | 0 | 3K | 0 | Northumberland |
| 32.1 | 1985-05-31 | 4 | 41°10'N / 77°52'W | 41°13'N / 77°19'W | 29.00 Miles | 3330 Yards | 0 | 0 | 25.0M | 0 | Clinton |
| 35.8 | 1952-07-23 | 2 | 40°37'N / 77°34'W | 0 | 4 | 25K | 0 | Mifflin | |||
| 38.3 | 1967-09-21 | 2 | 40°25'N / 77°11'W | 0.10 Mile | 30 Yards | 0 | 0 | 250K | 0 | Perry | |
| 39.8 | 1982-04-17 | 2 | 41°12'N / 76°24'W | 41°15'N / 76°21'W | 4.00 Miles | 30 Yards | 0 | 1 | 25K | 0 | Columbia |
| 42.4 | 1955-08-19 | 2 | 40°24'N / 77°23'W | 0 | 0 | 25K | 0 | Chester | |||
| 42.5 | 1981-07-26 | 2 | 40°52'N / 76°15'W | 0 | 0 | 25K | 0 | Schuylkill | |||
| 43.4 | 1991-09-18 | 2 | 40°40'N / 77°49'W | 40°42'N / 77°47'W | 4.00 Miles | 330 Yards | 0 | 3 | 250K | 0 | Huntingdon |
| 45.1 | 1989-11-20 | 2 | 40°37'N / 77°49'W | 40°39'N / 77°47'W | 3.50 Miles | 1230 Yards | 0 | 0 | 25K | 0 | Huntingdon |
| 45.7 | 1954-09-19 | 2 | 41°31'N / 76°40'W | 41°29'N / 76°25'W | 12.80 Miles | 50 Yards | 0 | 0 | 25K | 0 | Sullivan |
| 46.9 | 1985-05-31 | 4 | 41°12'N / 77°57'W | 41°10'N / 77°52'W | 4.50 Miles | 3330 Yards | 0 | 0 | 25.0M | 0 | Centre |
| 47.3 | 1989-06-20 | 2 | 40°22'N / 77°30'W | 2.00 Miles | 23 Yards | 0 | 1 | 25K | 0 | Perry | |
| 47.3 | 1975-06-05 | 2 | 40°45'N / 77°55'W | 0 | 0 | 250K | 0 | Centre | |||
| 47.4 | 1974-04-14 | 2 | 41°25'N / 76°33'W | 41°32'N / 76°21'W | 12.80 Miles | 100 Yards | 0 | 0 | 25K | 0 | Sullivan |
* 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.