On April 1, 1974, a very strong low pressure system developed in the great plains and eventually moved into the Ohio Valley. At the same time a large mass of cold, dry air was dropping down from Canada along with a huge surge of unusually warm moist air coming up from the Gulf of Mexico. All of these features converged under an intense jet stream with 140 mph winds at an altitude of around 40,000 feet in the atmosphere.
The collision of all of these weather features on April 3 caused warm air to rush up very rapidly as strong jet stream winds in the atmosphere were blowing counterclockwise creating the perfect recipe for tornado formation.
Source: Accuweather.com
The tornado formed southwest of Xenia in Bellbrook Ohio at about 4:30 pm EDT. It began as a moderate sized tornado and then intensified as it moved northeast at about 50 mph. The tornado had a multiple vortex structure, which is described as multiple funnels coming together and formed one large funnel as it approached Xenia. The huge tornado then slammed into the western part of Xenia and completely flattened the Windsor Park and Arrowhead subdivisions at f5 intensity, completely wiping out brick homes and other structures in its path.
Once the tornado reached central Xenia at 4:40 pm, it was videotaped and observed to have as many as 5 sub vorticies again merging into one twister. It destroyed commercial buildings, apartment buildings, churches, and schools including Xenia High School. Students who were in the school at the time had taken cover in the main hallway just seconds before the twister tossed a school bus on top of the stage they were practicing for a play on.
As the tornado moved along, it lifted up and blew over railroad cars from a moving Penn Central freight train in the center of town. The storm toppled headstones in Cherry Grove Cemetary before moving through the downtown business district and passing just west of the courthouse, which sustained some exterior damage. Many of the businesses in the downtown area were extensively damaged or destroyed, along with the local A&W Root Beer stand that was flattened and where 5 people were killed. The tornado then moved on into the Pinecrest Garden District, which was majorly impacted.
After exiting Xenia, the tornado passed through Wilberforce, severely damaging several campus buildigs of Wilberforce University. It also ripped through Central State University damaging nearly 80 percent of the campus and killing two people and injuring twelve according to the April 9, 1974 edition of the Daily Kent Stater. Afterwards, the tornado weakens and then finally dissipates in Clark County near Vienna. The tornado would later be classified as an F5, the strongest on the Fujita scale with top wind speeds estmated at 250 to 305mph. A document from NOAA's Storm Data Publication indicates that approximately 300 homes were destroyed and around 2100 others were damaged along with much of the downtown business district. Many sources also claim that Ted Fujita, the creator of the Fujita scale assigned an F6 preliminary rating to the tornado making it one of only two tornados to ever receive the rating and later downgraded the rating to an F5, because he later regarded F6 ratings as inconceivable.
Source: NWS Wilmington
Path length: 20.4 miles
width: 533 yards
fatalities: 34
Injuries: 1150
Rating: F5
Counties: Greene, Clarke
Source: NOAA Storm Events Database
Source: nssl.noaa.gov
Source: britannica.com
Even today, meteorologists and severe weather experts do not fully understand why tornados form, but they do better understand the factors and ingredients that have to come together to create the type of supercell thunderstorms that produce some of the most violent tornados. Fortunately, with better knowledge along with advanced technology, more advanced warnings can be given if or when a tornado will occur.
Tornados are violently rotating columns of air extending from thunderstorms in contact with the ground. They develop when wind variations with height support rotation in the updraft. Warm humid air rises while cool air falls along with rain or hail. The air rising within the thunderstorm can begin to spin when affected by winds blowing in different directions. These features can cause air currents to spin inside of the cloud. These spinning currents can start out horizontal and then turn vertical droping to the ground and become a tornado.
Source: nrcc.cornell.edu
Source: washingtonpost.com
It is estimated that an average of 1200 tornados hit the US every year. Typically the highest number of tornados occur in a broad area in the central US known as Tornado Alley. However, violent tornados can and do happen outside of this region every year. In fact, tornados can occur and have been reported in every US state. Tornados can occur at anytime of the day or night. Typically the most tornados occur between the hours of 4PM and 9PM.
Tornados are rated based on the damage they cause and their estimated wind speeds. On February 1, 2007 a new rating scale known as the Enhanced Fujita Scale was formed. This system rates tornado damage more on how structures are designed along with wind estimates, using the 3 second gust at the point of damage to different types of structures. If several different structures matches the damage indicator being considered and matches one of the 8 degrees of damage used by the scale, a tornado evaluator will determine whether the wind speeds that caused the damage is higher or lower than the expected degree of damage value. Once all of these determinations are completed, a final rating can be determined.
A tornado watch is issued for an area when conditions are favorable for severe weather and tornado activity to occur. If a watch is issued for your area, have a plan of action in place and stay tuned to local weather radar and reports throughout the duration of the watch.
A tornado warning is issued for an area when either a tornado has been reported by spotters or indicated on radar and there is a serious threat to life and property to those in the path of the tornado. A tornado warning means that you should immediately find safe shelter and take action to protect yourself.
Most injuries and deaths from tornados are caused from falling or flying debris. While there is no real complete safe place during a tornado there are places you can go and things you can do to protect yourself.
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