This work presents two methods of forecasting currency crises: the signal approach and the logit models. The article focuses on econometric logit models and presents the results of a crisis forecast simulation for Poland. The work discusses the definition of a currency crisis. Adequate calculations show that macroeconomic variables behave differently before the crises than in the periods immediately following them. Therefore the work suggests two methods taking account of this phenomenon and discusses examples of the application of the obtained forecasts to the process of decision taking by monetary authorities in order to prevent a possible currency crisis.