Classification and detection of tornado disasters

The intensity grade of tornado is divided by Fujita series (or "Fujita Pearson tornado grade") and improved Fujita series, which can be obtained by high-resolution Doppler radar data or photogrammetry. It should be noted that the intensity of tornadoes cannot describe tornadoes of any size and width.

The destructive power of tornadoes from small to large can be divided into F0 to F5 according to Fujita series, and can also be divided into EF0 to EF5 according to the improved Fujita series. The EF0 tornado may only damage trees, but it has no effect on relatively strong buildings. However, an EF5 tornado may raze buildings and even distort towering skyscrapers.

Hook echo image on weather forecast radar

In addition, similar Toro classification classifies tornadoes into T0 to T 1 1 *12, with T0 representing extremely weak tornadoes and t1/representing the strongest known tornadoes.

On the weather forecast radar screen, the area where the tornado appears will present a "hook echo" image. When these bad weather happens or is about to come, a series of "wind chasers" usually remain vigilant to find tornadoes and notify local meteorological agencies. They like to track thunderstorms and tornadoes and explore their real situation and scientific explanation. In order to analyze the internal structure of the tornado, the "wind chaser" has tried to throw probes into the tornado many times, but since 1990, only five needles have been successfully thrown in. The National Weather Service also has a project called Skywarn, which is responsible for training storm observers to observe storms that may bring strong hail, strong winds and tornadoes. Storm observers include county sheriff, state police, firefighters, ambulance drivers, wind chasers and other individuals. In the storm warning, the National Weather Service will ask these observers to look for these storms and report tornadoes immediately, so that the Meteorological Bureau can issue an alarm in time.