He said MPs could not "responsibly impose on our country a risk that may be severe of serious short-term disruption", and that he would continue to oppose the government until March to "put paid to this disastrous proposal".
She is doing so in the hope that MPs will come back from the season of goodwill primed to shower her with some of it, that compromise will be the order of the day and that her own troops at least might be willing to go along with her plan.
A vote is due around January 15.
Congestion at the Channel ports caused by the reintroduction of customs checks on goods has been one of the most commonly cited negative effects of a no-deal withdrawal from the European Union at the end of March.
"The only way is for MPs to coalesce around a reasonable deal, which this is, and get it through. We have to face the world as we find it, not as we wish it to be, and we have to deal with the facts as we find them". He said: "I think the key issue here is, of course, is that time is running out".
What happens if MPs fail to force May back within three days?
Scottish Secretary David Mundell made a similar private warning in Cabinet late previous year but until now no minister has gone public.
"In terms of extending Article 50 the reality is it's not a unilateral decision".
Asked about any extension, the Prime Minister's official spokesman also said: "The PM has been very clear on a number of occasions that that is not something we are intending to do". Britain is due to leave the European Union on Mar 29 at 2300 GMT.
Glenn Close earns standing ovation at Golden Globes with message to women
Oh is only the second Asian woman to win in the category ever and the third Asian actress to win any acting Golden Globe . Glenn Close took home the Golden Globe for Best Actress, Motion Picture, Drama for her performance in " The Wife ".
Barclay replied: "The Prime Minister has made that commitment crystal clear".
"Everyone recognizes that Brexit is an existential threat to the United Kingdom automotive industry and we hope a practical solution will prevail", he said, calling for lawmakers to back May's deal to guarantee a transition period.
The European Commission repeated on Monday that EU leaders would not renegotiate the Brexit deal agreed with May, who said she was seeking further assurances from Brussels on the deal.
Before last month's vote was pulled, scores of Conservative MPs voiced their opposition to the plan and few have publicly given any signal they have changed their mind since then.
Earlier, former Treasury permanent secretary Nick Macpherson tweeted that it was unrealistic to expect such a timeframe.
How exactly they stop it is another question - no deal is still the default option.
Meanwhile, Labour's frontbench and more Tory backbenchers gave their support for the first time to a new amendment tabled by Yvette Cooper and Nicky Morgan to prevent a no-deal Brexit.
They will provide information on both no-deal and other Brexit scenarios, and will be followed by billboards and posters in the coming weeks. Parliament can step in to insist that the people should have the right to decide.
"We are leaving the EU on the 29th of March this year, because that's what Article 50 says, that's what Parliament voted for, and that's now what domestic British legislation says as well", Britain's minister of state for exiting the EU, Martin Callanan, told reporters in Brussels.