Actually, you can. That's the latest thing among the algo trading set, apparently. They put news feeds through their systems looking for certain things to trigger trades. If they programmed the system to read weather headlines and react to them they could do that trade automatically. I'm not saying they do, but they could.
I red about a company providing such signals recently, but cant find it - For my system, it would be nice to have a signal coming in with uptrend,downtrend or sideways on the intrady timeframe - an algorithm fit for a trending day using all the pull backs, milks the market very efficiently - if the market is trending the direction you set .....