ABSTRACT Coronal holes (CHs) are the source of high-speed streams (HSSs) in solar wind, whose interaction with slow wind creates corotating regions (CIRs) heliosphere. Whenever CIRs hit Earth, they can cause geomagnetic storms. We develop a method to predict strength CIR/HSS-driven storms directly from observations using CH areas and associated magnetic field polarity. First, we build data set ...