Sure, it's sunny now, but the weather forecast is grey and wet for much of Colorado by late this afternoon.
The National Weather Service has issued a flash flood watch for late Tuesday afternoon and into the evening for most northeast Colorado including regions in the mountains, foothills and Denver.
Thunderstorms will develop by early afternoon in the mountains and foothills and developing in the late afternoon over Denver, according to the National Weather Service who refers to the storms as "monsoonal." The thunderstorms have the potential to produce heavy rainfall of one to four inches in less than an hour, depending on location and proximity to the storm.
7News reports that the heaviest rain will move through the metro area between 5 p.m. and midnight Tuesday night.
Heavy rain and thunderstorms are expected through the evening and into the night. Some storms could be severe, especially on the eastern plains, 9News reports.
Boulder officials are preparing for the worst because these air masses are more moist than in the previous days storms, which were heavy nonetheless, says Bernie Meier of the National Weather Service to the Daily Camera. Officials are also expecting more rain out of these storms because they are slower moving. "It's expected to park for a while. Our hope is that it moves further east before it parks," Sarah Huntley, Boulder city spokeswoman said to the Daily Camera.
With the ground already saturated from recent rainfall, the possibility of flash flood increases with more heavy rainfall this afternoon and evening.
To see a map of all regions under flash flood watch, click here.