Check out Dave McClure's advice on the pitch if you haven't already:
http://500hats.typepad.com/500blogs/2009/08/your-solution-is...
http://500hats.typepad.com/500blogs/2009/08/your-solution-is...
EDIT: patio's rewrite seems to nail the problem side pretty hard.
Problem-oriented: Severe weather kills people and breaks things. Our customers entrust their lives and property to Stormpulse. Its us and humanity versus death and destruction. Join our side.
Solution-oriented: We made a really cool AJAX/Flash mashup which combines a bunch of publicly available weather data sources. We'd like more money to develop a bunch of awesome features we have in the pipeline. How about it?
They're equally true. They're by no means equally effective.