Top Story with Tom Llamas - Aug. 21 | NBC News NOW

Breaking tonight, don't go in the water. That warning to millions of Americans as Hurricane Aaron barrels up the east coast. Monster waves pounding the eastern seabboard. Aerial video of neighborhoods flooded out as storm surge rushes in. Dangerous rip currents at beaches stretching from North Carolina to Maine. The major risk at high tide tonight. Our Bill Karen standing by. Also breaking, campus shooting scare. students running at Villanova University after false reports of an active shooter. What we're l ...