 Of note in this season is an unusual spree of very intense storms . Hurricanes Emilia , Gilma , John , and Olivia all reached a pressure below 930 millibars . Longevity @-@ wise , no tropical cyclone of any basin had previously persisted for as long as Hurricane John , which lasted 31 days . Elsewhere , Hurricane Rosa caused four casualties in Mexico as the basin 's lone landfalling tropical storm or hurricane , and later was responsible for flooding in Texas . 
