Newcastle’s Betfair Fighting Fifth Hurdle card will be subject to an inspection on Saturday morning because of the threat of frost.
Clerk of the course James Armstrong reported that temperatures may drop to as low as minus 4C overnight, and an inspection will therefore take place at 8am.
Frost sheets are already in place, on ground described as heavy after 15mm of rain on Wednesday and Thursday.
Armstrong told Sky Sports Racing: “We had another 3mm of rain through yesterday (Thursday) and last night. It is now dry and set to remain so.
“It’s pleasant this (Friday) morning, and the sun is up, but as the cloud clears that brings an inevitable dip in temperatures.
“We’re looking at temperatures dropping below freezing somewhere around 7pm or 8pm this evening, through until 8am, 9am or 10am on Saturday morning.
“We’re forecast anything from zero to minus 4C. We’re really just having to keep a very close eye on things as time progresses.”
Waterlogging has, meanwhile, forced the abandonment of Sunday’s card at Leicester.
That course failed an early-morning inspection on Friday and so became the second to lose its fixture this weekend, with Doncaster’s Saturday meeting already cancelled at waterlogged Town Moor.
Carlisle’s card, the only one remaining in Britain on Sunday, is also under threat from frost – and an inspection will be held to assess conditions at 1pm on Saturday, with overnight temperatures forecast to dip to minus 2C.