NCAR scientists conducted forecast experiments for Huricane Ernesto several months after it struck.  They initiated trial forecasts with data taken when Ernesto was a weak tropical depression off of South America, more than four days before it became a category-1 hurricane, and ran the forecast 102 hours forward.  One forecast was done with only conventional data and a second added in 15 GPSRO profiles, only one of which was within 100 km of the depression.  [Ref: Chen, Y., H. Liu, Y.-H. Kuo, C. Snyder and J. Anderson, 2007: Impact of COSMIC radio occultation refractivity profiles on prediction of hurricane Ernesto (2006).  Submitted to Geophys. Res. Lett.]