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This is "world one," live from london. our top stories -- u.s. president barack obama is meeting the british prime minister, david cameron, in london. they're talking about libya, afghanistan and a lot of other issues. later, mr. barack obama will speak to british lawmakers where he's expected to say the u.s. and europe must play a leading role in global security. a cloud of ash from a volcano in iceland is now affecting german air space, a day after hundreds of flights to and from scotland were grounded, all airports in berlin were due to closed for takeoffs and landings just a few minutes ...

storm. our meteorologist jen delgado joins us from the cnn weather center. jen, how is it looking now? >> we still have watches and warnings across parts of the midwest. of course, we talked about the stormed that happened earlier in the week but according to the national weather service it looks like based on doppler imagery we look like a possible tornado touched down in arkansas. anywhere we're seeing in red we still have a tornado watch in effect. that's for parts of arkansas and missouri. if i take you over to this, we have a report that one person died. it's a rural town, but b...

grounded as volcanic ash clouds a continent. and nato keeps up the pressure on moammar gadhafi. tripoli comes in for more bombing. we begin in london where the u.s. president is kicking off day two of his state visit to britain. right now barack obama is at 10 downing street for talks with british prime minister david cameron. they've got lot on their plates, the talks mark a shift in tone for the president. tuesday was mostly about pageantry, meeting the royal family and getting the vip treatment over at buckingham palace. today it is all about politics. and washington's close t...

>> really? which knives and forks to use? >> so you know, always start from the outside. the outside, you could be imposing on other people's territory it's so vast. >> wow. >> it will be dressy dressy and a lot of uniforms. but, again, the president's goinging to bring his own personality to this. we know the queen likes him. and i think if his speech is as good as the one yesterday in ireland, then, certainly, it will be fun. >> who's invited? there are, what, 200 people? >> yes. various dignitariedignitaries. the american ambassador, who's going down so well. so, if you are invited to this,...

Disruption for sure. >> how long can this go on for? how long can ash keep spewing? >> i think if we look back to previous eruptions of grimsvotn, they typically don't last too long. mostly of a week. this is following the same pattern. most of cloud went to the north and now it looks, fingers crossed, that things are slowing down a bit. there are no absolutes, of course. is an an inprecise science but let's hope for the best. >> dr. matthew watson, thanks. you're watching "world one" love from london. thanks for joining us. we want to show you more pictures of those dramatic images of torna...