Sunday's meeting at Fontwell is subject to an 8am inspection on raceday morning.The West Sussex circuit is due to stage a seven-race National Hunt card, but another night of freezing temperatures has put the fixture in serious doubt.Clerk of the course Edward Arkell said: "We got down to minus 3C overnight and we're only due to get up to around plus 4C today."We're due another frost for tonight, which is forecast to be less severe than the last few nights, but then it could be a bit colder on Sunday than it is today, possibly only getting up around 3C."We'll wait and see where we are in the morning, but we do need to see a significant improvement."