UPDATE 7:50 p.m.
Highway 24 has been reopened in both directions according to the Colorado State Patrol.
A flash flood warning had closed U.S. 24 from Cave of the Winds to Cascade. The warning was issued for El Paso County, including the Waldo Canyon burn scar.
Most of Colorado remains on flood watch from noon Tuesday to Wednesday afternoon, the National Weather Service in Pueblo stated.
Monsoon moisture created slow-moving storm systems that have lingered over the mountains since the weekend and have already dropped more than an inch of rain in several places throughout the state.
For Tuesday, the weather service forecasted a 60 percent chance of showers and thunderstorms across all of south-central and southeast Colorado with possible rainfall rates up to two inches per hour.
Those storms are expected to reach the southeast plains and mountains late Tuesday into Wednesday morning, the weather service said.
"Storms will be slow-moving and capable of producing very heavy rainfall," the weather service stated. "Burn scars, urban areas, and locations with saturated soil from recent heavy rain will be highly susceptible to flash flooding."
El Paso, Fremont and Teller counties were all included in the flash flood watch, as well as Pikes Peak, Rampart Range, Ute Pass, the Wet Mountains and the Sangre de Cristo mountains.
Additional thunderstorms are predicted to develop over the plains through the late afternoon and overnight hours, possibly continuing into Wednesday, the weather service said.
A few storms over Colorado Springs could produce heavy rainfall, mainly after 3 p.m., and may drop up to half-an-inch, according to weather service forecasts.
Overnight lows may dip to the upper 50s as storm activity is expected to continue through the night, possibly delivering more than half-an-inch of rain, the weather service said.