Saturday's game in Yokohama decides who wins the pool.
Tournament rules state that pool matches unable to be completed on the scheduled day are deemed a 0-0 draw with two points awarded to each side, which would end Scotland's participation.
Yet, there were contrasting rumours that the latter match may be put back until Monday.
If the weather is too bad, World Rugby's options appear to be to either cancel the England-France and Japan-Scotland games or move them to another city.
Wales coach Warren Gatland said they would have to run players out of their usual positions after a bruising 29-17 win over Fiji booked a place in the World Cup quarter-finals but left flyhalf Dan Biggar groggy with a second head injury.
"Such plans, if required, will only be actioned if the safety of teams, fans, and workforce can be guaranteed", Rugby World Cup organisers said in a statement.
However, such radical changes in direction are not unusual for typhoons nearing Japan, which sees around 20 per year.
The main islands of Kyushu, Shikoku and Honshu - which includes Tokyo - are in the firing line, according to the official JTWC forecast, with the storm expected to hit by Saturday. They could be felt in the Shinjuku district, where the England team are based until Friday.
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"I've been speaking to Billy", Mitchell told reporters at the team hotel on Wednesday.
"I just said I wanted to go and have fun, fun in training and spend time with the boys and have a laugh and enjoy my rugby", added Reid, who has displayed his sense of humour through his social media videos. Whatever is thrown at us, we'll deal with it.
The Prime Minister wished the players and coaching staff well and believe they can deliver when it matters the most.
'It is important to understand all the permutations and plan for those permutations.
The Scots got the bonus point they wanted and more in Shizuoka and kept the opposition scoreless for the second straight game.
"Ultimately though, we're looking forward to playing France and that's where our focus is".
Cheika has demanded a more disciplined display after Adam Coleman and Lukhan Salakaia-Loto were both sin-binned for high tackles against Uruguay as the Wallabies conceded 12 penalties to their opponents' five. "We've had a long rest into this game".
The costly bonus point win put Wales top of Pool D ahead of second-placed Australia.
Fiji's defeat means they are out of the tournament, yet they exited in style despite having two players sin-binned, by testing every sinew of Wales' character and resolve.