Unity School District Natural Disasters and Weather Extremes
Hot Rankings
The chance of earthquake damage in Unity School District is lower than New Hampshire average and is much lower than the national average. The risk of tornado damage in Unity School District is lower than New Hampshire average and is much lower than the national average.
Earthquake Index, #142
| Unity School District | 0.25 |
| New Hampshire | 1.01 |
| 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
| Unity School District | 0.0000 |
| New Hampshire | 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, #111
| Unity School District | 52.97 |
| New Hampshire | 65.04 |
| 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 2,417 other weather extremes events within 50 miles of Unity School District 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: | 34 | Dense Fog: | 1 | Drought: | 10 |
| Dust Storm: | 0 | Flood: | 273 | Hail: | 391 | Heat: | 15 | Heavy Snow: | 164 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 8 | Landslide: | 0 | Strong Wind: | 119 |
| Thunderstorm Winds: | 1,001 | Tropical Storm: | 0 | Wildfire: | 0 | Winter Storm: | 105 | Winter Weather: | 42 |
| Other: | 253 | ||||||||
Volcanos Nearby
No volcano is found in or near Unity School District.
Historical Earthquake Events
A total of 3 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Unity School District.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 47.6 | 1940-12-20 | 5.6 | N/A | 43.7 | -71.5 |
| 35.7 | 1982-01-19 | 4.7 | 7 | 43.51 | -71.62 |
| 39.6 | 1963-12-04 | 3.7 | 33 | 43.6 | -71.6 |
Historical Tornado Events
A total of 18 historical tornado events that had recorded magnitude of 2 or above found in or near Unity School District.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 5.4 | 1962-07-09 | 2 | 43°18'N / 72°24'W | 43°20'N / 72°20'W | 3.00 Miles | 100 Yards | 0 | 0 | 3K | 0 | Sullivan |
| 9.3 | 1962-07-09 | 2 | 43°16'N / 72°30'W | 43°18'N / 72°24'W | 4.70 Miles | 33 Yards | 0 | 0 | 3K | 0 | Windsor |
| 10.1 | 1966-08-11 | 2 | 43°18'N / 72°28'W | 1.00 Mile | 33 Yards | 0 | 0 | 25K | 0 | Windsor | |
| 12.9 | 1955-10-24 | 2 | 43°22'N / 72°30'W | 1.00 Mile | 33 Yards | 0 | 0 | 25K | 0 | Windsor | |
| 13.8 | 1962-07-09 | 2 | 43°18'N / 72°36'W | 43°22'N / 72°28'W | 7.60 Miles | 33 Yards | 0 | 0 | 25K | 0 | Windsor |
| 23.9 | 1998-05-31 | 2 | 43°02'N / 71°57'W | 43°02'N / 71°57'W | 0.50 Mile | 85 Yards | 0 | 0 | 30K | 0 | Hillsborough |
| Brief Description: A short-duration minimal F2 tornado moved along a half-mile long track which averaged 85 yards wide in Antrim in northwest Hillsborough County. A National Weather Service survey team investigated the damaging effects of this tornado and spoke with many eyewitnesses. One resident recalled seeing the NWS' Tornado Warning (which specifically mentioned Antrim) scroll on Cable TV a few minutes before the tornado struck. The tornado began at Nahor Hill and travelled north-northeast about a half mile before ending up just past the Great Brook Elementary School. Along the middle of its path, a wooded stretch sustained severe tree damage. Most of the trees were either uprooted or snapped in half...and they fell in different directions. A small boat was flipped over and a camper-trailer was turned around and flipped over. A single family home had some shingles torn off. An apartment complex resident said he saw the metal garbage dumpster rise a short distance while a dark gray-black cloud went by. At the elementary school, a wall was damaged. Only minor damage and no injuries occurred as a result of this tornado, but had the track been only a few hundred yards to the east, it could have caused significant damage to the center of the small town of Antrim. | |||||||||||
| 24.7 | 2002-06-05 | 2 | 43°11'N / 72°44'W | 43°11'N / 72°44'W | 0.10 Mile | 150 Yards | 0 | 0 | 75K | 0 | Windham |
| Brief Description: Thunderstorms, that initially developed in New York, and produced a macroburst in extreme eastern New York, moved into southern Vermont during the evening of the 5th. The storms spawned two tornados, one in Woodford Hollow, Bennington County and the other one near Wilmington, Windham County. The first touchdown, one mile north from Route 9, produced a swath 150 yards wide and a path length of one half mile. Many trees, as large as a foot in diamter, were either knocked over or ripped apart. Trees also fell on three automobiles. This tornado was assesed to be a F1 intensity, with winds estimated between 80 and 100 mph. The second tornado, 4 miles northeast of Wilmington, was even stronger despite a narrower swath of 50 yards. The path length was also about a half mile. This tornado, in addition to blowing some trees down, mostly destroyed a sturdy house on Haynes Road. The garage of the house was blown off its foundation. The family room was ripped off the end of the house, nearly killing the owner. Luckily the owner escaped without any injuries. However, antiques in the attic of the home, as well as numerous other possessions from throughout the house, were spread out for miles downwind, and a propane tanke was missing. The winds with this tornado were estimated between 125 and 150 mph. Non-tornadic thunderstorm winds blew some trees down in the town of Pownal. Lightnting struck a home in North Bennington causing a very small fire with minimal damage to the structure of the house. | |||||||||||
| 24.7 | 1973-05-11 | 2 | 43°34'N / 71°57'W | 0.50 Mile | 150 Yards | 0 | 0 | 0K | 0 | Grafton | |
| 27.2 | 1969-06-06 | 2 | 42°54'N / 72°12'W | 1.50 Miles | 150 Yards | 0 | 0 | 3K | 0 | Cheshire | |
| 30.0 | 1968-08-20 | 3 | 43°06'N / 72°48'W | 1.00 Mile | 27 Yards | 0 | 1 | 25K | 0 | Hillsborough | |
| 31.4 | 1961-07-02 | 2 | 43°06'N / 71°42'W | 2.00 Miles | 17 Yards | 0 | 0 | 3K | 0 | Hillsborough | |
| 31.5 | 1997-07-03 | 2 | 42°57'N / 71°51'W | 42°57'N / 71°51'W | 2.00 Miles | 250 Yards | 0 | 0 | 250K | 0 | Hillsborough |
| Brief Description: Very severe thunderstorms moved through Cheshire and Hillsborough Counties, producing two tornadoes, microbursts, damaging thunderstorm winds, and large hail. It appears that a microburst hit Hinsdale and both a microburst and weak tornado affected the town of Swanzey, just south of Keene, in Cheshire County. A horse barn was destroyed and an ice arena damaged at the Cheshire Fairgrounds. Pieces of aluminum were wrapped around street lamps and two-by-fours were driven into the metal sides and roof of the ice arena. One person was slightly injured by flying glass fragments when her car windows were blown in. Many trees were uprooted or blown down. Damage was estimated at approximately $500,000 at the Fairgrounds. There was evidence of both straight-line wind damage and some rotation associated with this storm. In Hillsborough County, a tornado touched down in the western portion of the town of Greenfield just to the west of Otter Lake. It then moved to the northeast, damaging a sawmill, destroying a recycling facility, and damaging some buildings at a campground. Wood and aluminum buildings were torn apart or blown over. Many large trees were broken off near their bases and hundreds more had their tops broken off. There were no injuries reported. Trees were reported blown down in Marlborough and a microburst may have occurred in nearby Dublin, where numerous trees and tree limbs were blown down along the shore of the Howe Reservoir. All of the aforementioned damage was along a path cut by the same thunderstorm complex. However, trees also were reported blown down in the towns of Walpole and Marlow in northern Cheshire County from a separate cluster of thunderstorms. About 1,700 electric customers in the Monadnock Region lost power during the storms. Most of the outages occurred in the towns of Marlborough, Marlow, Richmond, Swanzey, and Winchester. Another 100 lost power in Walpole. Statewide, about 10,000 electric customers lost power. | |||||||||||
| 31.8 | 1963-08-13 | 2 | 42°50'N / 72°12'W | 2.00 Miles | 17 Yards | 0 | 0 | 250K | 0 | Cheshire | |
| 39.4 | 1968-07-17 | 2 | 42°50'N / 71°48'W | 0.10 Mile | 17 Yards | 0 | 0 | 25K | 0 | Hillsborough | |
| 42.4 | 1969-05-29 | 2 | 43°12'N / 73°06'W | 0.50 Mile | 33 Yards | 0 | 1 | 25K | 0 | Bennington | |
| 42.7 | 1972-07-03 | 2 | 43°25'N / 71°26'W | 1.00 Mile | 40 Yards | 0 | 7 | 25K | 0 | Belknap | |
| 47.4 | 1972-08-09 | 2 | 42°33'N / 72°08'W | 42°41'N / 72°03'W | 9.70 Miles | 10 Yards | 0 | 1 | 25K | 0 | Worcester |
| 48.0 | 1963-06-09 | 2 | 43°00'N / 71°30'W | 42°52'N / 71°24'W | 10.00 Miles | 77 Yards | 0 | 0 | 250K | 0 | Hillsborough |
* 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.