Low-level convergence due to sea breezes under offshore large-scale synoptic flow in the eastern regions of the Iberian Peninsula sometimes leads to the development of a sea-breeze front that triggers convection which may occasionally be extraordinarily severe, causing significant rainfall, hail and gusty winds. Sea-breeze thunderstorm cells can develop unexpectedly under weakly defined synoptic-scale or mesoscale precursor disturbances and therefore may be missed by the operational forecasts.
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