For instance, last week Venus passed between the earth and the sun in what's called an inferior conjunction, a part of the alignment of what many are calling the grand cross. HERE for the full sized image. At the very very bottom of the SOHO image, you can see what looks like three comet tails, two small ones and a big one in the middle. Believe it or not this is Venus at inferior conjunction. The solar system is alive with electrical energy.
Magnetic effects are real but they are by products of the true cause-electrical interactions.
This could very well affect our magnetic field and Earth based weather. The big key here is the upcoming planetary alignments and that it will be the electrical plasma alignments not gravity that will be the potential harm givers. If the comet starts to kick up CME's in that alignment then we should see some truly horrible hurricanes develop in the Atlantic. Although not out of the realm of possibility, the more fearful threat is what is already occurring as related to the comet. Only 38 twisters have been recorded in the entire state in the last decade.