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."
25 May 2016Gershwin set to miss Epsom and wait for Royal Ascot
Karl Burke delighted with Felix Leiter strike at Lingfield
Winners keep flowing for Adrian Keatley in wake of Classic success
Curragh winner Van Der Decken has Royal Ascot option
Zonderland bids to build on Guineas sixth at Sandown
Speedy Mehmas on National service at Sandown
High-class entries for Sussex Stakes
Sammy Jo Bell facing further injury setback
Max Dynamite set for power-packed return at Sandown
French Derby set to be next challenge for Zarak
Michael Halford on weather watch ahead of Anamba Naas outing
Roger Charlton hoping Time can pass Brigadier Gerard Test
Tryster on course for Prince of Wales's date at Royal Ascot
Queen Anne at Royal Ascot on Ervedya agenda
Paddy Payne hoping sister Michelle will consider riding retirement
Jim Best guilty verdict quashed and rehearing announced by appeal board
Found back in hunt for Coronation Cup at Epsom
Jonathan Portman celebrates Wolverhampton win with Ickymasho
Trials take place at Yarmouth ahead of return to racing action
Andrew Thornton happy to put in the miles as landmark looms
A Shin Hikari dazzles for Japan in Prix d'Ispahan at Chantilly
Godolphin set to add Goodwood winner Skiffle into Oaks mix
Wings Of Desire delights John Gosden in Epsom workout
Kieren Fallon set for Sir Michael Stoute Derby reunion with Across The Stars
24 May 2016Found ruled out of Coronation Cup date
Max Dynamite tops Henry II field at Sandown for Willie Mullins
Time takes Brigadier Gerard Test at Sandown
John O'Shea keeping Royal Ascot options open for Holler
Owen Burrows set sights on Royal Ascot with Muntazah
Michelle Payne ruled out of Royal Ascot following abdominal surgery
Royal Ascot could be next for The Tin Man following impressive Windsor victory
Classic ace Adrian Keatley keeps up the good work with Millefiori at Ayr
Ken Condon sets long-term sights on Champion Stakes targets with Success Days
Delight for Sir Mark Prescott as Time Warp strikes in France
Erica Bing set to go Trophy hunting for Jo Hughes at Beverley
Gifted Master stars in high-class entry for Sandy Lane Stakes at Haydock
Massaat pointing to Epsom but French Derby remains an option
Clive Cox keeps faith in Royal Ascot-bound Kodi Bear
Joy of six appeals to Profitable and Clive Cox
Adrian Keatley ponders transatlantic adventure with Jet Setting
23 May 2016Chantilly rain pain for Andre Fabre and New Bay
Initial scans clear Michelle Payne of serious injury
Willie Mullins to make French Champion Hurdle call with Un De Sceaux
Waady and Muthmir in Royal Ascot hat for King's Stand Stakes
Melbourne Cup heroine Michelle Payne in hospital after fall
No Italian Derby joy for Dermot Weld as True Solitaire finishes last
Jet Setting grounds Minding on 'dream' day at Curragh for Adrian Keatley
Fascinating Rock too strong for Found in Curragh clash
Epsom Derby bid unlikely for The Gurkha, confirms Aidan O'Brien
Beacon Rock shines at Curragh for Aidan O'Brien and Ryan Moore
Kevin Ryan switches attention to Royal Ascot with The Grey Gatsby and Ashadihan
'Bring it on' - Galileo Gold's trainer Hugo Palmer relishing Royal Ascot rematch
Irish Guineas winner Awtaad set to stay at a mile and head for Royal Ascot
Options open for Besharah after French Guineas fourth
22 May 2016Minding mastered by Jet Setting in Irish Guineas at Currragh
Van Der Decken delivers at Curragh
Plans fluid for progressive Fadillah
Minding seeking Classic double after late Guineas call-up
Exaggerator takes Preakness as Triple Crown dreams end for Nyquist
Kevin Prendergast rolls back the years as Awtaad bags fairytale Irish Guineas
Devonshire glee for Willie McCreery in Lanwades Stud Stakes
Royal Ascot set to be next stop for classy Caravaggio
Mobsta gangs up on Greenland rivals
Profitable day out at Haydock for Clive Cox and Adam Kirby
All-the-way Un De Sceaux bounces back in style at Auteuil
Curragh rain means Time Test a non-runner in Tattersalls Gold Cup
Big prizes on the horizon for Moonrise Landing after York success
Decorated Knight takes top honours at Goodwood