conditions this year are similar to october 1991. the year of the perfect storm. when hurricane combined with a huge cold weather system, the resulting storm killed 12 people and caused $200 million in damage. when a tropical system combines with a cold system we call it an atmospheric bomb. that's what happened in 1991, that's what many forecasters believe will happen at the end of this week or beginning of next week. the forecast models offer compelling reason for the east coast to stay on alert. sam champion, abc news, new york. >> i wasn't worried about the storm yesterday. this was the line in our evening editorial note. there is a consensus forming in weather forecast models, that hurricane sandy is unlikely to go out to sea. instead it will more likely merge with a strong fall cold front and transition into a powerhouse, possibly historic midlatitude storm along the mid-atlantic and/or northeast