Well, that was a short-lived spectacle. Anyone who cleared their Wednesday morning to point at a low-flying helicopter over the Schuylkill is going to need a new hobby. The National Guard water emergency exercise that had been planned for September 2nd in Conshohocken is canceled, according to MoreThanTheCurve. The reason is not local weather but conditions at the helicopter's home base.
These drills are the boring-in-a-good-way part of emergency preparedness. They practice for the day nobody wants, over the river most of us cross twice daily. The Guard has not announced a rescheduled date in the material we have, so consider this a rain check rather than a cancellation with prejudice.