Overnight severe storms produced tennis ball-sized hail in parts of eastern Boulder County, acting as an appetizer for what will unfold later today as the greatest risk of severe weather in years may develop across the Denver Metro area. Low clouds lingering during the morning may delay the severe weather ignition today, but huge hail, damaging winds and a few tornadoes are still in the cards for the afternoon and early evening hours for some area. After the severe weather threat diminishes, soaking rain becomes the story Thursday into early Friday with areal flooding possible.