eric fischer, chief meteorologist at wbz joins us with more on this. eric, what is ahead? >> reporter: good evening, jeff. the jet stream is taking a big dip, of course unusually stormy weather here in the united states, big tropical, dipping down into the south and the flip side you have a huge ridge building in the east so you have a contrast between the chilly air coming down from canada and thry warm air that will be invading the east coast and between you have got the storms. they will start tonight across the plains, oklahoma and texas in particular, okc down to dallas is where it will start, the storms will be tracked in a way eastward as we head through the overnight, most widespread t,y of severe weather is tomorrow, spread stretching from southern illinois to indiana right down to the gulf coast, we could see several tornadoes on monday, certainly wind gusts aireats and the storms will start to slow down and also talking flash flooding, very heavy rain localized and a lot of heat, we are talking eighties over a big chunk of the east. >> glor: meanwhile action in

eric fischer has the overnight forecast.on dahler has more on how hackers got hold of tens of thousands of snapchat photos that were supposed to disappear. and an electric wheel attached to your bike. michelle miller takes the copenhagen out for a spin. >> am i getting a workout? captioning sponsored by cbs

eric fischer is following the cold weather. >> a lot of cold air for a lot of places. freeze warnings out here in purple. a lot of cool temperatures right now. also into friday night. freeze watches have been posted further south and east, will likely expand for saturday morning. cold temperatures exexpected. down to 35 in atlanta and little rock. these are cities where it will be colder in the outlying areas. chicago might be the worst weather halloween city. 50-mile-an-hour winds, chance of snow, temperatures in the thirtsz and lake shore flooding for friday. first half of the weekend. these are high temperatures. lots of 40s and 50s. by saturday night the coldest air since february will be coming down into florida. the temperature is part of the story. snow another. white halloween for u.p. of michigan and lower michigan, especially kentucky friday night. for friday night and saturday morning, heavy mountain snow, 3 to 6 inches in the appalachians. this becomes a powerful coastal storm on saturday. 50-mile-an-hour winds hit the mid-atlantic coast and heavy snow acro

eric fischer from the congressional research service. i have a question, andy, there's -- a dhs program around a number of years called built security in. and the part of cert now, i gue guess. so my question is what has the impact program been, and how might it help in the future, and i'm also wondering whether the industry folks have been involved in that. >> oh, man. an awesome -- trying to fig are out how to insert this sales pitch. >> you didn't plant this. >> thank you. so dhs, department of homeland security, has a larger effort called the software assurance effort. in my organization. we also have efforts in our science and technology organization. all of which are designed around first doing, in science and technology, about doing the r & d helping us understand how we do build security any the first place. my organization's effort is really about taking industry and the experts who have been doing really strong software assurance. meaning, building software that does what wei want it do and nothing else. and spreading those les

hospital in dallas, where a breakdown in electronic communication led to thomas eric duncan being sent home. dr. fischer says given the scope of the outbreak in west africa she expects to see ebola patients in new york city. >> the trick will be in several months from now to keep doing those mock runs to make sure that it's always on the forefront of people's minds because i don't think ebola is going away any time soon. >> pelley: jon we heard dr. fauchi earlier say there's not going to be an outbreak in america. how can he be so sure? >> pelley: scott, it's important to distinguish between an individual case of ebola and an outbreak and i think it's important to emotionally immunize americans against the near-certainty that there will be individual cases but given the robust health care system here, it's very likely that it will be contained but only if prot colis followed, something that was not done in dallas. >> pelley: we're approaching flu season. i can imagine people will start getting symptoms and jump to the wrong conclusions. >> reporter: right even without a travel history to west africa the