Ers i Storm Dennis greu llanastr ledled y wlad ym mis Chwefror 2020, mae Cymru wedi gweld cynnydd cyflym o ran amlder stormydd a llifogydd nag ar unrhyw adeg arall a gofnodwyd mewn hanes.
Since Storm Dennis wreaked havoc across the country in February 2020, Wales has experienced a rapid increase in the frequency of storm and flood events than at any other time in recorded history.