Sunday's fixture at Towcester has been abandoned because of a waterlogged track.
Twelve millimetres of overnight rain has contributed to the adjacent River Tove having burst its banks. With standing water along the bottom of the track, course officials felt no need to delay the inevitable.
Towcester clerk of the course Robert Bellamy said: "I've been in office here six years and have never seen the River Tove as deep as this before."
He went on: "It's starting to recede now, but every forecast you look at indicates there is another band of heavy rain coming tomorrow.
"We were left with little option but to abandon now."
Exeter's meeting on Sunday is now subject to an 8am inspection on raceday morning.
Officials at the Devon circuit had intended to assess conditions at 8am on Saturday, but that has now been put back 24 hours.
Although the track was raceable on Friday morning, 18 millimetres of overnight rain fell - on top of 87mm over the last four days. An ominous forecast on Saturday is also giving cause for concern.
Exeter clerk of the course Barry Johnson said: "We'd be fine tomorrow, so it's pointless inspecting on Saturday morning.
"We are worried about a band of rain later on Saturday - we could see 40mm - but, at this moment in time, I'd be quietly confident we'd be OK. The course is taking the rain fantastically well."
31 July 2015Warrior books Ebor ticket
Muthmir makes amends
Hughes at his best on Bay
Pacy Muthmir rules in King George
Mile proves golden for Beloved
Malabar stamps her class
Dettori guides Dubday to landmark
Breizh bids for Galway glory
Charlton so Close to historic win
Pharoah Phan Phestival good to go
Diamonds ready to sparkle in Nassau
Jack's the lad in Galway Hurdle
Gosden salutes 'magical' Sir Peter
Laviniad gets up late in Corrib
Simple for Beckett and Bentley
Orange pips Goodwood rivals
Shalaa dazzles in Richmond
Relief for Hughes as Gibeon strikes
Cover up for Goodwood defence
30 July 2015Clown gets serious at Galway
Eddery aiming for Mile high
Fox finale for Hughes
Ivory unveils strong Stewards' team
Treacy sent for scans
Stars on show in Nassau
Lynam 'proud' of Sir Peter alliance
Tributes pour in for O'Sullevan
It's Shanahan's turn at Galway
Sir Peter O'Sullevan dies, aged 97
Kachy not for catching in Molecomb
No Sussex regrets for O'Brien
Solow flying high at Goodwood
Highland reels in Gordon rivals
Shalaa in top trim for Richmond
Dunlop excited by Trip to Goodwood
29 July 2015Fortune favours Twiston-Davies
Peacock pair vie for Galway glory
Moviesta gets King George go-ahead
Karakontie has Deauville date
Dog delivers for Mullins and Walsh
Tint proves Topaz jewel
Maguire back in the saddle
Blue back with a bang
Tough Toormore takes Lennox glory
All roads lead to Arc for Postponed
Logan shines for Kirby
Frankie grabs Gold at Goodwood
So seeking Sussex success
28 July 2015King targeting Molecomb reign
Mullins hoping Bob is back
Wayman lands BHA role
Medrano eyeing Gordon glory
Options open for Force
Group race aim for Nisser
Modem takes control
Solitaire shines in Weld double
Bach in business
Vastonea out to sparkle in Topaz
Tanzeel unlikely for Cup date
Birch bids for Vintage victory
Toor targets Lennox triumph
Gleneagles misses Solow clash
Charlton eager for Golden Test