With the Flat Turf season only days away already the weather threatens a showpiece event.
The British Horseracing Authority and the Levy Board have sanctioned a seven-race card because of an unfavourable weather forecast that could threaten racing on turf.
The main meeting on Saturday is at Doncaster featuring the William Hill Lincoln, the first big race of the new turf Flat season.
Races at Southwell will close at noon on Thursday and final declarations must be made by 10.00 am on Friday. The first race is due off at 1.25.