Prospects for jump racing in Britain for the rest of the week, including Saturday's big meetings at Sandown, Musselburgh and Wetherby, are in the balance as freezing temperatures and snow threaten considerable disruption to the turf programme.
Today's fixtures at Leicester and Plumpton were called off due to frozen ground, while morning inspections will decide the fate of tomorrow's cards at Wincanton and Fakenham.
The likelihood of Yorkshire tracks, Catterick and Wetherby, being able to fulfil their fixtures on Friday and Saturday, appear remote barring a dramatic change in the weather forecast, while Sandown and Musselburgh are also in some doubt.
Harriet Graham, clerk of the course at Musselburgh, which stages a valuable two-day meeting over the weekend, said: "Things aren't brilliant here. We're 50-50 to race on Saturday at best.
"We've had very low temperatures overnight, and frost has got in under the covers.
"I was much more optimistic about our chances yesterday."
Wetherby, due to stage the Grade 2 William Hill Towton Novices' Chase, couldn't have raced today.
Jonjo Sanderson said: "The average temperature last night was -4C. There are some crusty bits and some hard bits.
"It's 3C at the moment, but temperatures are forecast for drop dramatically and get down to -5C overnight into Thursday.
"The next temperature rise in 48 hours time might be a bit late for us."
Andrew Cooper, clerk of the course at Sandown, is more optimistic, but conceded that the better end of the forecasts would be needed to enable racing to take place.
"We're raceable today," he said. "We got 5mm of rain and sleet last night and it got down to -2C.
"We're expecting snow on Thursday afternoon into the evening, with up to 5cm. It is going to stay cold on Friday.
"We've got several forecasts. The best forecast or even the better end of the worst forecast would give us a hope.
"I would expect we'll end up making a decision on Saturday morning."
Catterick is currently "frozen in places". Clerk of the course Fiona Needham said: "It's a gloriously sunny day, but temperatures are due to plummet tonight.
"I expect we'll have an inspection tomorrow."
Chepstow is the other scheduled jumps meeting on Friday. Libby O'Flaherty said: "We've up to 5cm of snow forecast for Thursday into Friday.
"The snow turns to rain at 5am on Friday, and temperatures are due to reach 2C by 9am.
"It's a difficult one. Fingers are firmly crossed."
Wincanton's meeting tomorrow is also under threat from the expected snow with an inspection scheduled on the morning of racing for 8am, while frost is forecast at Leopardstown where the two-day Dublin Racing Festival is scheduled for the weekend.
Wincanton clerk of the course Barry Johnson said: "Snow is going to be the main issue for us but we will take each day as it comes. It seems bad weather is on the way but we will closely monitor the forecast."
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