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Of capacity, although they've been able to take it a little bit lower. i think it's good for the job they're doing. i don't think it would hurt to look at what other assets are out there and how it could help them in the future if they don't find it with the bluefin. >> dr. prager, it must be hard as a scientist to explain to the viewer certain facets of this search. but in your estimate what makes this a critical juncture and do you think it will be found? >> so i think the reason they're calling it a critical juncture is they had narrowed the target for the search based on those pings. the c...

As you describe, imagine drawing a six mile diameter circle around the ping areas and then putting a square around that. and that's what the submersible has to do. has to cover all that area. and they need to cover that first. if that does not turn up the wreckage, then absolutely they should bring in more equipment. >> but thomas, how discouraging is it in your view if they abandon the use of the bluefin any further this week or just over the matter of a couple days more before pulling it out of the water. >> well, it's not really discouraging. i mean, the bluefin robotic system, it's designe...

It's something that was made by man, and i really have no idea what it would be other than an acoustic beacon. >> reporter: searchers who are towing that pinger locator behind the australian ship "the ocean shield" have detected it four times -- first two on saturday. as time has passed, they are noticing that the signals picked up tuesday are not as strong as who they heard on saturday. >> that means probably we're either a long way away from it, or in my view, more likely, the batteries are starting to fade, and the consequence is the signal becoming weaker. >> reporter: two dozen airplanes ...

I felt you near me. i appreciate you. >> reporter: thank you. a mother with no support system at home crushed by the burden of waiting to find out what happened to her first born son. sara sidner, cnn, kuala lumpur. leaders of the search operation openly acknowledge they're making an educated guess about the possible crash site, and that's why the target area has changed a number of times. our tom foreman is looking into this part of the story for us. he's joining us from our virtual studio. tom? >> yeah, wolf, really the hopes for those families, for finally getting an answer to where in th...

The possible distance it flew south into the indian ocean. cleaning up this morning in and around trenton, missouri. a powerful storm, possibly a tornado, striking near that town. several homes were damaged or destroyed, but no one seriously injured. crews are now working to restore power to residents and businesses in the area. >> wow, devastating. >> could be straight-line winds, but boy, that looks ugly there. >> right. >> no one was hurt. that's the good news. >> that's amazing. well, jennifer gray is in for indra petersons today, has a look at your forecast. powerful images. >> those ...