Flash Flood Watch issued September 19 at 8:38PM MDT until September 20 at 12:00PM MDT by NWS

.Thunderstorms will continue to expand in coverage overnight into Thursday morning. This thunderstorm activity will have the potential to produce high rainfall rates, and rapid accumulation of rainfall in a short period of time. Total rainfall of 1 to 3 inches will be possible by Thursday morning, with localized rainfall amounts above 3 inches possible. This rainfall on top of