Rain, hail, & tornadoes! Another, albeit quicker round of severe thunderstorms exploded across the Metro shortly after lunchtime Tuesday afternoon. The first storm to ignite moved across north Boulder, Gunbarrel, and Niwot, producing a hefty layer of hailstones, some of which reached 1.5" in diameter. All of that melting hail rapidly cooled the moistened air at ground-level, producing a dense …