The National Weather Service in Pueblo has issued a flood advisory for west central El Paso County until 6 p.m.
The weather service said Doppler Radar estimated two to four-tenths of an inch of rain over the lower portions of Williams and Waldo canyons.
"Runoff from this excessive rainfall will cause minor flooding to occur, especially along small streams and new low water crossings," the weather service said. "Some locations that will experience minor flooding include Colorado Springs and Manitou Springs."
Earlier, the weather service said rains over the Waldo Canyon burn scar were expected to be scattered and moving slowly.
Weather forecaster Patrick Ciossi elaborated on predictions made Thursday evening, calling for heavy rains in Teller and El Paso counties. With a 70 percent chance of thunderstorms in Teller County on Friday afternoon, Ciossi said the big question is simply where the showers and lightning will pop up.
A flash-flood watch went into effect at 11 a.m. for areas near the Waldo Canyon burn scar and will run through 10 p.m. A watch means that conditions are ideal for scattered thunderstorms.
Ciossi and the weather service could not predict Friday morning how much precipitation will fall.
The watch could be upgraded to an advisory if weather spotters begin to see two-tenths to a half-inch of rain per hour. A warning will be issued if rates reach a half-inch per hour over the burn scar.
-- Sand bag filling station
The Colorado Springs Office of Emergency Management opened a sand bag filling station on Friday for homeowners who could be in the line of flash-floods pouring out of the Waldo Canyon burn scar.
Sand is available at the Wilson United Methodist Church, 6460 Flying W Ranch Rd., on a first-come, first-serve basis during daylight hours. Residents are instructed to bring their own shovels. Empty sandbags will be available at four Colorado Springs fire stations - Nos. 5, 9, 12, 18.