The weather at the landing site isn’t acceptable. Look like only chance of demo’ing the landing on this mission is if it gets delayed to February 20th or beyond.
[Update shortly after launch]
All seems to be nominal so far, a few minutes after a beautiful sunset launch.
[Update a couple hours after launch]
SpaceX reports that the rocket came down vertical within ten meters of the virtual target. IOW, the landing probably would have worked if not for sea state.