The Chattanooga area could get up to seven inches of rain in a new wave of downpours Tuesday through Sunday.
Some streams are already swollen and under minor flood advisories, including Lookout Creek and Chickamauga Creek.
The National Weather Service said, "A prolonged period of heavy rain is expected from Tuesday through Saturday. The heaviest rainfall will likely fall across the Plateau, central and southern sections of East Tennessee, and Southwest North Carolina where 5 to 7 inches are possible.
"Since the ground is already saturated and streams are high, any additional heavy rainfall will likely cause flash flooding. Significant stream flooding, flooding of roadways, additional ponding of low lying areas, and mud slides are possible.
River flooding is also a concern for mid to late week. There is a possibility of Flood Watches being issued for at least some parts of the area by mid-week. Continue to monitor future forecasts for the latest information.
Amy Maxwell of Hamilton County Emergency Preparedness, said, "The Hamilton County Office of Emergency Management (HCOEM) will meet with local emergency officials and agencies to discuss preparedness and planning for the heavy rainfall to hit Hamilton County this week.
"For several days, HCOEM has been receiving weather updates from the National Weather Service in Morristown, Tennessee regarding the expected heavy rainfall to arrive tomorrow and last thru Saturday.
"The probability of flash flooding is high. Four to six inches of rainfall is expected in the Hamilton County/Chattanooga area for several days.
"HCOEM officials will be getting updates from Tennessee Valley Authority officials regarding creek and river levels throughout the week."
Here is the latest forecast:
Tonight
Mostly cloudy, with a low around 33. Northeast wind around 10 mph.
Tuesday
Showers likely, mainly after 2pm. Cloudy, with a high near 43. Northeast wind 5 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
Showers. Low around 40. Northeast wind 5 to 10 mph becoming southeast after midnight. Chance of precipitation is 90%.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 8am. High near 57. South wind around 10 mph. Chance of precipitation is 90%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 50. Chance of precipitation is 90%.
Thursday
Showers. High near 60. Chance of precipitation is 80%.
Thursday Night
Showers. Low around 48. Chance of precipitation is 80%.
Friday
Showers. High near 61. Chance of precipitation is 80%.
Friday Night
Showers. Low around 52. Chance of precipitation is 80%.
Saturday
Showers and possibly a thunderstorm. High near 67. Chance of precipitation is 80%.
Saturday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 54. Chance of precipitation is 70%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 65. Chance of precipitation is 70%.