A lot of highwater rescue vehicles prepositioned, a lot of personnel out there ready to act as soon as this weather comes through. it has been more than 80 years since southern california has seen a tropical storm make landfall, so a lot of people are nervous. officials telling them to just be prepared. natasha when, cnn, los angeles. christina dahl, principal climate scientist at the union of concerned scientists. thank you for joining us. millions brace for hillary clinton hullrricane hilary. what is cause this can dangerous storm? that s right, california does not typically experience hurricanes or tropical storms like this. we re having a very unusual situation in which a hurricane formed off the west coast of mexico, and it s traveling northward, whereas most