"We had maybe three or four days (of calm weather) and that’s all it took for the stuff to build up considerably," Bonny Schumaker, the physicist who now runs the non-profit On Wings of Care, which makes regular flights over regions of the Gulf affected by the 2010 oil spill.
In a flight report from Jan. 27 posted on the group’s website, she described the oily expanse as "huge."
Please continue reading by By John Roach, Contributing Writer, NBC News
http://science.nbcnews.com/_news/2013/01/31/16792048-mystery-oil-sheen-grows-near-site-of-bp-gulf-disaster-says-researcher?lite