Taunton's richest ever meeting on Saturday could be the best chance of any turf racing going ahead over the next few days.
Temperatures in Somerset are fairly tropical compared to most of the rest of the country, but even they are not completely safe, with a band of either snow or rain moving in.
Taunton groundsman Kevin Council said: "Whether we get rain or snow we'll just have to see as it depends on which forecast you read. It is due to hit us early on Friday so we should know by 10am where we stand."
Ascot's meeting, which features Sprinter Sacre's return in the Grade One Victor Chandler Chase, will need to survive a 4.30pm inspection on Friday, but snow is forecast.
Clerk of the course Chris Stickels said: "There are some signs of frost under the covers. I'm pretty confident we could race (on Thursday) but could not be certain unless I lifted the covers right off.
"Snow is forecast for Friday afternoon and evening, so it makes sense to have a precautionary look on Friday when we'll have a good look under the covers and we'll be able to assess the snow situation."
Haydock's meeting on Saturday, which is due to stage the Peter Marsh Chase and a Champion Hurdle Trial, is in grave doubt, as having already survived one inspection, clerk of the course Kirkland Tellwright will look at 8.30am on Friday.
He said: "We had minus 3C overnight and we are forecast further frosts and there is a clear chance of snow on Friday afternoon. We could get six centimetres of snow and obviously that would beat us, so there is plenty to worry about yet."
Lingfield's all-weather meeting on Friday is also subject to an 8am precautionary inspection on raceday morning due to the threat of snow.
Clerk of the course Neil MacKenzie Ross said: "It now looks like there is now potential for heavy snow over us on Friday. We've dealt with snow in the past, but it could cause a problem if it's continual."
30 January 2015Walters Kean for National win
Newbury to stage veterans' hurdle
Polamco aiming to be Sandown Hero
Johnson seeks Champagne celebration
Dude set for two National prep runs
Leopardstown date for D'Antan
No hurry for Flemenstar return
Aigles skips Dubai trip
Uxizandre team eye date with Grugy
Wetherby announce inspection plan
Melodic in Exeter frame
Chepstow gets go-ahead
Classy display from Vercingetorix
Ffos Las blow for Carruthers
McCoy in line for Coneygree mount
Blossoming Serge in Supreme hat
Peace declared for Triumph
Hercules features in Bartlett
Games given Neptune entry
29 January 2015Good news for Burke after X-rays
Bayan handed French mission
Exciting Eagle ready for action
Ellison on Red alert
Brother sets sail for Festival date
Ferof takes Ascot acid test
Cogry has dual Festival options
Hourigan duo to duck National Trial
Salsify back in Foxhunter frame
Wintry Catterick calls inspection
Chepstow on weather watch
Musselburgh bids to beat weather
Legend in line for Kempton repeat
Henderson at Peace for Triumph
Henderson primes Betfair squad
Henderson happy with Sprinter
Unioniste set for Newbury outing
Bolger left in awe of super Sceaux
Sam set for Gold run
Denman date for Obeaux
28 January 2015Charities get O'Sullevan boost
Betway boosts sponsorship portfolio
Estrella waits on record bid
Spring not on Focus agenda
Warne on comeback trail
Warne on comeback trail
Mann planning Bleu National prep
Henderson dealt Triolo blow
Tornado blows hot at Taunton
Mann duo head to Musselburgh
Ginge given Scilly date
Cue Card goes back to basics
Eagle ready for hurdling bow
Shark angling for Punchestown prize
Nicholls retains Zarkandar faith
Ruby handed World ticket
27 January 2015No worries at Wetherby
Fry issue Puzzle warning
Grimthorpe goal for Milan
Ellison duo primed for Supreme test
Mulholland maps out Festival plans
Master retains Festival options
Doubt team seek jumping improvement
Dettori possible for National role
Uttoxeter bid appeals for Murphy
Ryanair defence likely for Dynaste
Palace stars in Towton fifteen
Gilgamboa set for longer trip
Jezki 'fine' after Hurricane defeat
Sire satisfies in schooling session
Sceaux leaves Mullins purring
Faugheen fancied for Walsh mount