Yellen comments at the Economic Club of Washington at 17:25 GMT:
- Delaying liftoff too long risks abrupt tightening
- Downside risks from abroad have diminished since the Summer
- Slowdown in China likely to be modest and gradual
- China has taken action, could do more if needed
- Expects inflation to move up to 2% over next few years
- Fiscal policy to be positive for growth in coming years
- Household spending particularly solid in 2015
- Expects continued economic growth at a moderate pace
- Sees risks to outlook as 'very close to balanced'
- Lower inflation expectations would be a concern
- Inflation expectations remain well balanced
- Full text of Yellen's speech
More US dollar strength on the headlines. Cable now below 1.49 briefly.