More rain than was originally forecast is now expected at Cheltenham, where the festival was already set to open on Tuesday at its softest for at least 20 years, with parts of the course having turned to heavy on Saturday.
While clerk of the course Simon Claisse confirmed it was dry through Saturday night into Sunday morning, breakfast time brought a prediction from the track's weather expert John Kettley that more rain than originally forecast would fall on Sunday and Monday.
The track had already had a total of 16mm over 24 hours to force a change in the official going description on Saturday to soft, heavy in places.
Claisse reported "just spits and spots of rain" on Sunday morning but revealed: "The significant change is that we are now due more rain before we kick off. We are now expecting up to 10mm between now and Monday night, rather than the 6mm we were previously talking about.
"The effect of that will depend upon its timing and intensity, but we are going to be starting on soft or slower. The midweek rain, which is up to 9mm, now looks set to be split between Wednesday night and Thursday morning, but the effect will be the same."
Claisse added: "The heaviest ground is behind the two-mile starts, and so only affects races over two-and-a-half and four miles, but where we have the intersections of the Old and New courses - in front of the stands, at the end of the back straight, and at the bottom of the hill as they turn for home - those areas are heavy too."
Trainer Nicky Henderson, who will check out the surface himself when he walks the course on Sunday, admitted that the testing ground could be a concern for Timico Cheltenham Gold Cup favourite Might Bite.
The last time the meeting opened on ground as soft was in 1995, the year Master Oats landed the Gold Cup by 15 lengths, and the word 'heavy' has not appeared in the official festival going description since 1993 on either the Old or New course.
"It has certainly not featured for 18 years and must be at least 20 years," Claisse said. "We would have had heavy had we run the festival in 2001 when we had foot and mouth.
"I was talking to Philip Arkwright [Claisse's predecessor as clerk], whose last recollection [of such testing conditions] was Master Oats in 1995."
Might Bite
Henderson had no worries about the conditions for Unibet Champion Hurdle favourite Buveur D'Air but said Might Bite, the Timico Cheltenham Gold Cup favourite, would not relish them.
"We are very happy with Might Bite," he said on Saturday. "He did a nice piece of work this morning and it is all systems go for Friday.
"The slight worry is going to be the ground. He won't relish it as much as some of our others, such as Buveur D'Air, but the Cheltenham going can change very quickly.
"I will do my walk of the course on Sunday as normal. I am hoping the ground does dry up in time for Might Bite on Friday. He is in great form and I couldn't be happier with him."
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