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.