Haydock could start their two-day meeting on Friday with heavy in the going description should the anticipated rain fall.
The ground at the Merseyside venue was soft on Thursday afternoon but as much as 12 millimetres of rain was forecast before the morning.
Should that be the case then clerk of the course Kirkland Tellwright expects conditions to have deteriorated slightly ahead of Friday's card.
He said: "The rain did begin to come late afternoon and we might get as much as 12 millimetres. If we do get that much I guess the word heavy will be mentioned in the going description.
"Friday we have been told to expect three millimetres of rain, then it's dry on Saturday."
The meeting at Towcester on Sunday is subject to a precautionary 8.30am inspection on Friday.
While the going is described as good to soft, soft in places, there are areas of standing water.
Clerk of the course Robert Bellamy said: "We've been dry but we had 19 millimetres of rain on Wednesday and have standing water in places.
"The forecast is pretty horrendous and it doesn't look good at this stage, but we'll reassess things and see where we are."
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