Yikes...pines have shallow roots. At least my oaks are deep rooted. It takes some major twisting wind to pull them out. The one that fell was twisted, too, so I suspect we had a small tornado (common during bad weather here...usually small).
I live in the Northern midwest. We had some good shear winds last sunday that tore out some good 200+ year old oaks ripped out by the roots. They don't like to call them tornadoes though. Shear winds seem to just come out of nowhere and just flatten everything in a 50 mile area and dissapear.