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The first portal storm was caused by the death of the Nihilanth. Notice after you kill him, multiple portals spew from his head. This caused a rift between earth and Xen allowing Xenian creatures to spew forth into our world. The combine used this interdimensional hole to force their way through to our plane, at which point they decimated earth's militaries in 7 hours.
(if I'm wrong or missed something important someone pwn me)
Interesting theory, but I thought you were sent to Xen to kill the Nihilanth because he was the source of the storms and killing him stopped them. Where are your sources and am I on to something.
He wasn't creating a portal storm perse, but he was keeping the rift between earth and Xen's dimensions open despite the satellite sent up. The resonance cascade was the initial tear, the Nihilanth was just keeping that particular one open.
"Despite the satellite sent up"? I pretty sure your thinking of HL2: EP2 the Nihilanth was long dead by then dude.
you know if you play ep 2 you see portal storms (2 i think) its the shockwave things, Alyx says they are portal storms.
Only burst of portal energy from damaged Citadel core caused seismic activities. First Days Portal storms were atmospheric events, I guess.A portal storm is a relatively random atmospheric event that is a minor result from the dimensional instability and rip which were caused at Black Mesa. A portal storm will open and allow organic matter to be transported from Xen to Earth, though, in random manners. A side affect of portal storms is "seismic activity," which is capable of destruction of man made buildings and structures.
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Or, in a shortened version, a random occurring dimensional instability which has the ability to transmit matter from Xen to Earth, and may cause seismic destruction of structures such as bridges and buildings.
Citadel had a fusion explosion or something. It's as close to a nuke as you're going to get.
Atoms? I don't think so...it looks more like electrons, probably with some exotic particles.well, it's all atoms going in an outward direction so whatever.