Henry Hudson Bridge to close sporadically Thursday night/Friday morning

Here's an email I received a little while ago. Seems important:

I wanted to inform you about some middle-of-the-night closures at the Bronx-bound Henry Hudson Bridge, taking place just after midnight Thursday--technically Friday, August 19th. As follows: there will be intermittent (15-minute-long duration) full closures of all northbound (to Bronx) lanes on Friday August 19th from 12:01 AM through 5 AM, for the removal of two large sign gantries. The closures will be established at the Dyckman Street entrance onto the northbound HH Parkway (Bronx-bound). 

Plan accordingly.