we begin this hour with an historic hurricane barreling toward the u.s. hilary is now a category 3 hurricane with top winds of more than 100 miles per hour. this is new video of the storm pummeling mexico as it inches closer to the u.s. the powerful system could bring a year's worth of rain in one day to parts of the southwest along with potentially catastrophic and life-threatening flooding. right now parts of southern california are under a tropical storm warning for the first time in history. officials and residents there are preparing with sandbags and the california national guard is standing by ready to help. a state emergency official tells cnn it's an all hands on deck situation. we've got a cnn team at this hour tracking hilary. meteorologist derek van dam is closely following the path aina tasha chen has a look at storm preps in los angeles. derek, let's start with you at the cnn weather center. i can't believe we're talking about a hurricane and preparations for it in los