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1890s

In 1895, D. Fisher with the United States Weather Bureau (USWB) published a case study on a tornado which struck Augusta, Georgia, on March 20, 1895, along with a twin tornado and a satellite tornado, which also struck Augusta. Two months later, the United States Weather Bureau conducted a short case study on the tornado outbreak of May 3, 1895, tracking each of the 18 tornadoes that occurred during the outbreak. A month later, meteorologists at the United States Weather Bureau conducted a case study on a tornado which struck Cherry Hill, New Jersey, and a tornado which struck Woodhaven, Long Island, New York, on July 13, 1895. The case study included a damage survey and meteorological analysis of the storms.

A map of the 1896 St. Louis–East St. Louis tornado‘s damage path by the Missouri History Museum

In 1896, H. C. Frankenfield with the United States Weather Bureau's local forecast office in St. Louis, conducted a case study on the 1896 St. Louis–East St. Louis tornado, which included a damage survey and meteorological analysis of the tornado and associated storm. Following the study by Frankenfield, a special case study was conducted by Julius Baier, a civil engineer in St. Louis to address an estimation made by Frankenfield. In his study, Baier stated that the tornado's center crossed directly over a barometer, which recorded a reading of 671 millimetres of mercury (895 mb). In the study, it was also documented that Baier, along with professor F. E. Nipher, tested the barometer and saw no apparent ways of an inaccurate reading.

Also in 1896, Norman B. Conger, an inspector with the United States Weather Bureau, conducted and published a case study on the 1896 Thomas, Michigan tornado, based on "all reliable, available sources". Conger's report also contained a map created by E. F. Hulbert. Following the tornado, Michigan governor John Treadway Rich created a committee to assess the damage and collect further information about the tornado.

In June 1897, Cleveland Abbe, a PhD meteorologist and professor at Columbian University, published one of the first tornadic frequency tables for each state in the United States, which included the annual average per state as well as the average per 10,000 square miles (26,000 km²). In the table, it was noted that Kansas was the leading state for tornadoes, with an annual average of 6.38 tornadoes, followed by Illinois with an annual average of 4.94 tornadoes. The only states documented with an annual average of 0 tornadoes was Alaska, Delaware, Idaho, Oregon, Rhode Island, Utah, and Washington. In July 1897, M. C. Walsh with the La Salle Institute reported the beginning of the 1896 St. Louis–East St. Louis tornado's track, which included a description of "two long, heavy black masses of cloud, one moving from the southwest, the other curving from the northeast" with them meeting "at a height of about 1,000 feet (330 yd; 300 m)".

In February 1898, J. J. O'Donnell, an observer for the United States Weather Bureau, published a detailed meteorological case study and damage analysis on a violent tornado which struck Fort Smith, Arkansas, on January 11-12, 1898. Prior to being struck by the tornado, O'Donnell observed a barometer which read a pressure of 28.846 inches of mercury (976.8 mb). O'Donnell also recorded the order-of-sequence of what an approaching tornado sounds like: "a gurgling noise...like water rushing rushing out of a bottle, followed immediately by a rumbling, such as that made by a number of heavy carriages rolling rapidly over a cobblestone pavement, and finally like a railroad train." O'Donnell later stated these three sounds, in sequence is the "tornado roar". This sequence of sounds documented by O'Donnell, particularly the sound of a train, is the described sound of a tornado by people, even in the 21st century.

In May 1898, Willis L. Moore, the chief of the United States Weather Bureau, created a map, which was later published by an order from the United States Secretary of Agriculture, of meteorological observations across the United States as well as the tracks of tornadoes which occurred on May 17, 1898. In July 1898, Arthur E. Sweetland wrote a case study, including a damage survey and analysis, for a tornado which struck Hampton Beach, New Hampshire, on July 4, 1898. In December 1898, Dr. B. F. Duke, along with Dr. Cleveland Abbe, published a paper regarding a theory on how tornadoes form after Duke observed the formation of a tornado near Pascagoula, Mississippi, in April 1894.

In April 1899, Dr. Cleveland Abbe, along with Professor A. W. Baker and E. L. Dinniston, published an article regarding the characteristics of tornadoes. In the study and analysis, Abbe discovered that tornadoes in the United States rotate counterclockwise, just the same as a large low-pressure system. Abbe also stated that this rotation rule for tornadoes "is almost invariable". Also in April, Abbe published an article along with the Iowa State Register and Iowa Weather and Crop Service, stated the number of tornadoes across the United States was not truly increasing and that any numeric increase in tornado count was strictly due to the increase of newspaper and telegraph coverage in the United States. It was also stated that tornadoes are now documented almost entirely within 24-hours, so no meteorological phenomenon is causing an increase in tornado counts. Abbe also stated anything to the contrary was a "popular mistake".

In April 1899, the Chicago Tribune wrote to the United States Weather Bureau via a news article posing the question on why tornado warnings are not sent out via telegraphs or even the telephone to warn the local population in the path. Cleveland Abbe responded by saying "it is certain that if any such arrangement were possible, the Weather Bureau would have done this many years ago" along with "we must remember that the destructive areas of tornadoes, and even of thunderstorms, are so small that the chance of being injured is exceedingly slight" and that "we do not attempt to prevent that which is inevitable".

In June 1899, U.S. Weather Bureau Oklahoma section director J. I. Widmeyer published that long-range forecasters in Oklahoma were sounding "unnecessary tornado alarms" due to "ignorant predictions" to residents in Oklahoma and that they were causing "frightened men, women, and children" to take shelter, despite no tornadoes occurring. Cleveland Abbe added on to the publication by Widmeyer saying, "It is unnecessary to resort to the caves and cellars, or to stop our ordinary avocations for fear of a tornado, until we see the cloud in the distance, or are positively certain that one is about to pass near us".

In July 1899, O. G. Libby, a professor at the University of Wisconsin–Madison, conducted a case study on a violent tornado, which struck New Richmond, Wisconsin, on June 12, 1899. Abbe later added onto the work by Libby in the final publication as well.