An update issued last night at 8pm states that river levels will continue to rise over the next few days and residents of Old Windsor should expect a worse level of flooding than in November, but not as bad as those seen in January 2003..
The statement said: "The latest forecast suggests that the river will reach higher levels to those seen back in November 2012, but will not reach the levels seen in January 2003.
"A few isolated properties in low lying areas adjacent to the river may be affected."
The same warning has been issued to residents of Wraysbury and Friary Island in particular.
A similar warning was issued for Datchet last night with Slough Road, Eton Road, Horton Road, Frogmore, Datchet Golf Course and Datchet Common all highlighted.
As with Old Windsor and Wraysbury, the water levels are expected to be higher than in November, but not reach the levels of January 2003.
The statement added: "A few isolated properties in low lying areas adjacent to the river may be affected."