There's a slight chance that he'll be back in time.

他及时赶回来的可能性不大。

《牛津词典》

The weather forecast says it will be cloudy with a slight chance of rain tonight.

天气预报称今晚多云，下雨可能性小。

youdao

The weather forecast says it will be cloudy with a slight chance of rain later tonight.

天气预报称，今晚晚些时候天气多云，下雨的可能性很小。

youdao

The Storm Prediction Center in Norman predicted a slight chance of severe weather in the Northeast on Sunday, mainly from the Washington, D.

NPR: Cleanup Goes On As Storms Move Toward East Coast

The dollar index is in danger of posting a technically bearish monthly low close Friday, with there also being a slight chance the index could post a quarterly low close if selling pressure picks up Friday.

FORBES: Comex Gold Up On Short Covering, Bargain Hunting, Bullish Outside Markets

Clinton still has a chance, if a slight one, to win the nomination if enough of the roughly 800 superdelegates were to back her.

CNN: Obama takes Oregon; Clinton wins Kentucky