microburst
noun
                                                                                                                            
                                                            mi·cro·burst
                    
                                                                                                              
                                                                                                                                  ˈmī-krō-ˌbərst  
                                                      
                                                          
            
                                
              
          
                                                      : a violent short-lived localized downdraft that creates extreme wind shears at low altitudes and is usually associated with thunderstorms                                      
                
                    
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  Merriam-Webster unabridged




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