The US National Hurricane Center predicts that tropical cyclones “Laura” and “mark” will form a hurricane in the Gulf of Mexico and land on the southern coast of the United States at almost the same time next Monday, or the first time in 150 years. And that’s not good news for local residents. < p > < p > < p > < p > < p > the Washington Post reported on the 21st that tropical depression “Laura” No.13 was formed in the northeast of the Leeward Islands of the Caribbean Sea that morning, which was the earliest “L” storm recorded in the United States. The previous record of “Lewis” storm occurred on August 29, 1995. However, another tropical depression No. 14, which may be named “mark”, is now passing through the Yucatan Peninsula in Mexico. The U.S. National Hurricane Center predicts that the two tropical lows are heading north and are expected to converge in the Gulf of Mexico by the end of the week. The prediction shows that the route of “Laura” and “mark” is relatively close, which may lead to the interaction of two tropical low pressure, thus enhancing the destructive effect of the hurricane. < p > < p > among them, “Laura” may become a category 1 hurricane next Tuesday, and may land in Texas and Louisiana; mark “may arrive on the south coast of Florida next Monday, and become a category 1 hurricane around Tuesday, landing in Alabama and other places. According to the National Oceanic and Atmospheric Administration of the United States, it is rare for two tropical cyclones to enter the Gulf of Mexico at the same time, the last time in 1933. At that time, however, they were very far away from each other, landing in Florida, the westernmost and the eastern ends of the American coast. < p > < p > according to the “underground weather” data of the commercial weather forecasting agency, 85% of the major hurricanes and 60% of the named storms originate from the main producing areas of the Atlantic tropical cyclones, and rarely appear in the Gulf of Mexico. It is even more rare for two hurricanes to appear at the same time. The Gulf of Mexico is only 1600 kilometers in diameter, and if the hurricanes are slightly closer, they may attract each other. < / P > < p > the forecast given by the National Hurricane Center of the United States points to this worst-case scenario: “mark” and “Laura” may enter the Gulf of Mexico through a narrow gate about 240 kilometers wide between Cancun and Cuba, respectively. If the distance between them is close to the wind speed, they may fall into the “double hurricane” effect of “Dancing” with each other. < / P > < p > this effect means that when two tropical cyclones form at the same time and are close to each other, there will be interaction, and the trajectory will rotate around the center of the circle with the center of the line between the two. If this happens, it is expected that the “mark” wind may increase significantly. < p > < p > < p > < p > according to the Washington Post, this is even worse for Florida and the southern coast of the United States, which is in the hurricane season, and will seriously limit the local disaster prevention resources. The article reminds American residents living in Florida or Mexico coast to pay close attention to the latest weather forecast.