LONDON, ONT. --
It was a scary sight Monday for some, as viewers in the region spotted funnel clouds forming.
Residents who thought they saw a funnel and some ominous looking clouds were not mistaken, but this type of funnel is much less destructive than a funnel that would be associated with a supercell thunderstorm.
What you may have witnessed is called a cold core funnel.
Cold core funnels can form beneath showers and weak thunderstorms. They are most common in transitional seasons, like spring and fall.
This type of funnel cloud forms when the sun heats up the lower levels of the atmosphere -- it causes convection to bubble up forming showers and isolated thunderstorms.