A local storm is a mesoscale atmospheric phenomenon characterized by convective or frontal activity confined to a limited geographic area and short temporal duration, typically driven by localized instabilities in temperature, moisture, and wind fields. It often arises from buoyant updrafts in conditionally unstable air masses, enhanced by mesoscale convergence zones such as sea breezes, orography, or differential surface heating. Local storms can include intense precipitation, gusty winds, lightning, and occasionally hail or downbursts, with spatial scales from a few to tens of kilometers. Their evolution is strongly influenced by boundary-layer processes and vertical wind shear, making them challenging to predict with coarse-resolution numerical models.
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