Scheduled National Hunt meetings at Doncaster and Huntingdon on Friday have been abandoned because of snow on the tracks.
Doncaster's big meeting on Saturday is also under threat. Officials on Town Moor made an early call to cancel the Friday fixture due to the diminishing prospects of a thaw.
Clerk of the course Roderick Duncan said on Wednesday: "There is still snow on the track. We had a little bit of a thaw yesterday but there is still more than a covering in most places. The forecast for Thursday was 2C at best and -4C at worst, with the best forecast overnight being zero. Further snow and sleet is also in some forecasts."
The Sky Bet Chase and the rearranged StanJames.com Champion Hurdle Trial feature on Saturday's card and officials will inspect the track again at 2pm on Thursday to assess prospects.
Duncan added: "We are going to have a look for Saturday just to see if there is any improvement. Saturday daytime temperatures are a little bit better but we need an improvement in overnight temperatures for Friday. There needs to be a significant improvement in the forecast for Saturday to have a chance. We will need a real positive overnight temperature on Friday to give us an opportunity."
Huntingdon's meeting on Friday was also abandoned on Wednesday morning. With the track still covered in snow, the decision to call off the fixture following a 9.30am course inspection was a straightforward one.
Clerk of the course Sulekha Varma tweeted: "Three inches of snow still on track and no prospect of sufficient thaw."
Officials at Sedgefield are pessimistic about their chances of racing on Sunday after calling an inspection for 2pm on Thursday. Clerk of the course Phil Tuck admits the meeting is likely to be called off as the track is covered by snow, with little chance of an immediate improvement.
He said: "I think it will be a formality really as it's not looking good here. We have got quite a lot of snow on the track, maybe five inches or so, and more in other areas where the snow has drifted.
"The temperature is forecast to drop to -4C tonight which does not give us much hope, so we will have a look tomorrow."
28 July 2014Quick picks off Galway rivals
Lion could roar in Champion Stakes
Time out for Carpenter
Beckett considers Gesture gameplan
PJA hits out at ERA Cosgrave case
Pitt ponders Sir Stewards' run
Bird in full flight for Nassau
Chopin team wait on softer ground
Beacon leads Hannon trio
Toormore on Goodwood mission
Options open for Approval
Star duo head Sussex field
Pallasator states case for Ebor
Custom a cut above
Harty doubles up in Galway feature
Munich Mission impossible
Jinx on a high in France
Cox plays it cool with Kodi
Girl given Lowther target
Burke looking to Curragh
Hanagan hails Taghrooda
Toormore drops in class for Lennox
27 July 2014Beacon shines over Molecomb rivals
Miss skips Galway for Goodwood
Tag crowned queen of Ascot
Muthmir delivers in Dash
Metal proves International star
Sheikh pounces for late score
Kingman poised for showdown
Kleo hits top gear for Cumani
Dettori strikes on Osaila
Bear grills Winkfield rivals
Yorkshire Oaks target for Volume
26 July 2014Taghrooda queen of Ascot
Elleval bids for Pomfret prize
Noble primed for German mission
O'Meara duo going International
Tag team happy to have a go
Telescope reaches for stars
Euro chasing dollar signs
Estimate given Goodwood entry
Pique Sous out for season
Secret chasing York success
Reason aiming to deliver in Dash
Remote on comeback trail
25 July 2014Hughes misses Newmarket rides
Bill seeks International acclaim
Tag team have a crack at George
Telescope has record in sights
Nicholls pays tribute to Business
Flintshire misses George date
Hills reveals positive test horse
Kennedy floored on Leopardstown bow
Candy sweet on hot-shot Alonsoa
Big guns in Irish Champion frame
Farraaj sidesteps York return
Classy entries for Champagne
Stars align for Sussex showdown
Kiyoshi dips in grade for Valiant
Gosden waits on Eagle call
Horsted heads International runners