July 29 -- one of the driest dates in Seattle history -- surprised many within the city when raindrops started to fall. "Measurable" rain has only been recorded on this day six times at the Federal Building weather station and just four times at Seattle-Tacoma International Airport (SEA).

"Traditionally, climatologically, today is the driest day of the year," Cliff Mass, an Atmospheric Sciences professor at the University of Washington (UW), said on "The Jason Rantz Show" on KTTH 770 AM. "And this isn't going back 30 years. We're talking about Seattle right now. It's a very dry day. It rarely rains. The most rain we ever had was 0.17 inches."