Simultaneous Nadir Overpasses (SNOs) between NOAA-19 and NPP over region 
TLE Epoch: 2013 8 21.  Predictions up to the next  30.0 days:

Date(NOAA-19)     Time(NOAA-19)   NOAA-19 Lat/Lon   Date(NPP)     Time(NPP)    NPP Lat/Lon    Distance (km)   Time Diff(sec)
 08/28/2013   02:31:16   (  13.11, 165.24) 08/28/2013   02:34:00    (  12.11, 160.93)  480.11            164
 08/28/2013   15:08:06   (  17.41, 160.92) 08/28/2013   15:06:36    (  18.13, 157.54)  365.86             90
 09/09/2013   16:18:55   (  22.63, 144.21) 09/09/2013   16:21:22    (  23.64, 139.85)  459.90            147
 09/10/2013   03:35:23   (  22.69, 147.64) 09/10/2013   03:34:08    (  21.98, 144.27)  354.88             75