ant swarms (where do they come from?)

Just saw a huge swarm of ants on the balcony on the upper rafters. Sprayed an entire can of raid, but where do these red and swarms come from?
Every 100th or 500th ant was big, with wings. Maybe thirty or forty out of thousands had wings. The rest are two or three millimeter red ants.
Any idea why the swarm? I've lived here for five years and have never seen that.
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On Sat, 2 Apr 2016 21:58:04 -0000 (UTC), Harold R

They are living in the ground somewhere nearby. When a mound is mature they send out a new queen in a swarm to start a new mound somewhere. You are hoping that the queen died in your attack. The do work pretty hard to protect her tho.
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On Sat, 2 Apr 2016 21:58:04 -0000 (UTC), Harold R wrote:

It sounds like a mating swarm of carpenter ants.

They do it about 2 or 3 days each year. Also, it may be that after five years from inception, it is now big enough to support a mating swarm.
BTW, your house probably needs to be re-built.
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orkin.com
orkin can bait the ground around your home, as well as treat your house, if needed. It's not that expensive. Beats the hell out of doing it yourself.
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