Simultaneous Nadir Overpasses (SNOs) near US between NOAA-19 and NPP
TLE Epoch: 2013 6 27.  Predictions up to the next  10.0 days:

Date(NOAA-19)     Time(NOAA-19)   NOAA-19 Lat/Lon   Date(NPP)     Time(NPP)    NPP Lat/Lon    Distance (km)   Time Diff(sec)
 06/27/2013   19:08:10   (  49.97, -93.01) 06/27/2013   19:01:21    (  51.49, -95.29)  233.00            409
 06/27/2013   20:50:14   (  49.95,-118.51) 06/27/2013   20:42:20    (  49.72,-119.85)   99.08            474