Multiple event interactions
To investigate how the potential for the interaction of different extreme events types has changed, we employed two methods to answer two slightly different questions.
Are there areas of the UK where the annual risk of occurrence at an individual grid point has increased between the two time periods (1961–1988 and 1989–2016) for two or more of the classes of extreme event?
To investigate this question we overlaid the grid points from the single event analysis to determine those points where there was a significant increase in two or more event metrics.
Are there areas of the UK where the risk of two or more different types of extreme event occurring at an individual grid point within a single year has increased between the two time periods?
To investigate this question we extended the methodology used for the single events to allow for dependence between them, and investigated how the probability of events of two or more types occurring within a single year has changed over the two time periods.