 An area of disturbed weather organized into a tropical depression at midday on October 8 . It had trouble organizing , and advisories were discontinued for a while . The cyclone finally became a tropical storm on October 11 and was named Rosa . It moved glacially , but eventually a trough steered Rosa north and then northeast . Rosa intensified quickly , peaking at Category 2 intensity just before landfall near La Concepción on the morning of October 14 . Rosa quickly decayed over the mountains of Mexico , and its cloud shield rapidly accelerated northward through the United States , spreading moisture . 
