The sea breeze front is the leading edge of the sea breeze, where cool maritime air wedges beneath hot continental air. It is visible on radar as a line of weak echoes and often marked by a row of cumulus.
On the Spanish Mediterranean coast, sea breeze fronts penetrate 30–80 km inland and are one of the main triggers of summer afternoon thunderstorms. When two sea breeze fronts from opposite coasts converge (as in Florida or Mallorca), convection is especially intense.