exterminator has a not so secret weapon. we want to welcome the viewer ins the united states and around the world. i'm wolf blitzer, and you are in i'm wolf blitzer, and you are in "the situation room." -- captions by vitac -- www.vitac.com it is the worst natural disaster to hit pakistan in decades, and right now, it is threatening to get even worse. a second wave of flooding is expected to swamp southern pakistan this weekend as massive rainfall from the north flows into areas that are already decimated. the scope of the disaster is stunning. as many as 15 million people affected, and more than 8,000 villages damaged or destroyed. almost 1,400 people are already dead. but for many, there is little sign of desperately needed aid. cnn's reza sayah in the flood zones for us. reza? >> well, wolf, over the past few days it seems that the pace of aid has picked up, but with the staggering number of people who