From bbc.co.uk:
Part 2:
QUOTE
The team are devastated by the loss of Ralf and are unsure whether they want to continue with project Stormshield. However, hurricane season is now under way and a much larger hurricane is threatening Miami. Despite their emotions, the team are keen to see how far they can take their experiments. If successful, they will surely save hundred of lives. The manipulative Katzenberg urges them to try out other ideas.
Distant perturbation is Dan's baby – this involves laying trails of carbon black in the skies over the West Coast; the carbon absorbs sunlight and will trigger the formation of a weak weather system that would move across the country, growing more powerful as it does. By the time it reaches the East Coast, it should possess enough energy to push the hurricane out to sea.
As Dan and Munish run the calculations, Katzenberg secures permission from the Floridian Senator to allow the experiment to take place. It will mean large parts of the Southern States are flooded by the experiment, but do they need to know why?
Permission is granted but, before the B52's take-off, Lance warns that another weather system has developed which will throw out their calculations. He urges Katzenberg to halt the experiment, but he refuses. Outraged by Katzenberg's irresponsibility, Dan pulls the plug, shutting down their computer system and resigning from the project. The rest of Stormshield follow.
However, when a suspicious weather system develops, the team realise that someone has gone ahead with the experiment, leading to devastating consequences. The hurricane will be deflected, but it will interact with another weather system that will nudge it up the coast. It's getting bigger, more powerful, more destructive and it's heading for New York City.
Part 3:
QUOTE
The team faces the ultimate dilemma: even though they didn't create the Superstorm, they will be implicated because their data has been used. The public will hold them accountable and it is they who will face the backlash. Stormshield take the radical decision to seed Hurricane Grace and to try to weaken it, or at least, nudge it off course – even a few degrees will spare New York from a direct hit.
As Sara flies directly into Hurricane Grace, Dan makes his way to New York City to oversee emergency procedures; at such short notice, a complete evacuation of the city is impossible and hundreds of thousands of people are at risk. As Stormshield try everything to help stop the monster they have unwittingly created, the manipulative Katzenberg plans his defence.
However, just before the Superstorm strikes New York City, Hurricane Grace makes a three-degree shift to the north-east – Sara's seeding appears to have worked. But there's a hitch: New York City will be spared the worst of Hurricane Grace but it will now score a direct hit on Long Island – where the team is based. There is no time for them to make an escape...
