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Where we find cnn's aaron mclaughlin. let's start with the search zone. after shrinking all this past week why was the area suddenly expanded tooed? >> reporter: officials today didn't say specifically. but they have been steadily refining the debris search zone. they really only expanded around 6,000 square miles today which isn't all that much when you consider that the current debris field is about a quarter of what it was some ten days ago. while they've been really successful at refining this search field, narrowing it down, they've been less successful at actually finding anything. after...

Do not worry about the other search areas because the aircraft had been looking for wreckage on the surface and had been taking a count of 30 days of oceanic drift. but the satellite has essentially given us this area here as the most likely place where mh 370 entered the water. now, what is significant about this is that yesterday or a couple of days ago, haixun 01 had its encounter with the electronic pulse in this location here. ocean shield is currently working up in this location there. so all of the search underwater is being enabled by that wonderful work that was done by

Underwater search area which is reflected here. it's the area where the aircraft might have entered the water is reflected by these boxes here. don't worry about the other areas because the aircraft have been looking at footage on the surface and been taking account of 30 days of oceanic drift. but the satellite has essentially given us this area here as the most likely place where mh-370 entered the water. now, what's significant about this is that yesterday, or couple days ago, haixun 01 had its encounter with the electronic pulse in this location here. ocean shield is currently

The area where the aircraft might have entered the water is reflected by boxes here. do not worry about the other search areas because the aircraft have been looking for reccage on the surface and have been taking account of 30 days of oceanic drift. but, the satellite has given us this area here as the most-likely place where mh 370 entered water. now what is significant about this is that yesterday, or couple days ago, hisuin 01 had its encounter with the electronic pulse in this location here. ocean shield is currently working up in this location there.

Find any sign of that debris. again, it gets under way right away. >> all right. nbc's sara james. great information. thank you. the object spotted a few days ago could have drifted hundreds of miles. and the search area is over a massive stretch of ocean. kathleen doh a,n is a research scientist whose specialty includes turbulence and ocean currents. she joins me from seattle. all right. let's get right into this question of the drift, kathleen. how does the oceanic drift and the weather factor into this search? >> it all depends on where you are in the ocean. looking at where the satellite...