Als dit nog even stand houdt kunnen we spreken van een MCC denk ik.
A mesoscale convective complex has an area of cloud top of 100,000km² or greater with temperature less than or equal to -32 °C; and an area of cloud top of 50,000km² with temperature less than or equal to -52 °C. Size definitions must be met for 6 hours or greater. Its maximum extent is defined as when cloud shield reaches maximum area.
Bron: wikipedia