They claim if you keep the car racing in circles it keeps the heat moving up and keeping the rain away. This is refered to as "the vortex theroy" however i think enough heat just went up in the air that the rain will miss
If the race ended now Dave Blaney would be declared the winner as long as he can make it back to the start /finish line. Matt Kenseth chose to go into the pits when the caution came out for tires and fuel. I think this race will continue by the looks of things. If the track was toast they would either be fixing it or call the race by now.