California is battling its scariest 2015 wildfire so far — the Rocky Fire

It’s turning into quite a summer for wildfires across the United States. And the latest conflagration worrying authorities is the Rocky Fire north of San Francisco (see map here), which has burned 69,600 acres so far and is only 30 percent contained...Alarmingly, fire pros have been describing this fire’s behavior as pretty un-heard of. “Over the weekend, we saw this fire burn 20,000 acres in a five hour period,” says Daniel Berlant, chief of public information at Cal Fire. “That type of speed for a wildfire, without a weather condition like Santa Anas, is really unprecedented in recent times, or in even veterans of our department’s recollection.”