It came off the Hudson River and blew dust from the World Trade Center's footprint -- visible for blocks around -- leaving in a smoky cloud the tens of thousands who came to witness Wednesday's memorial service.
The number of flags billowing in that wind was only matched by the number of police officers at the location. Some were off duty, there to mourn the lost. Others were on duty, cordoning off streets, handling bomb-sniffing police dogs or telling people to step lively.
For most people it was a day of glimpses.
Crowds were pushed behind police blockades, leaving a streetwide buffer zone around the crater where the towers once stood.
The viewing area was closed for security reasons, and only credentialed press personnel and victims' families were allowed down the long construction ramp that leads to the footprint of the towers.
The closest most got to the site of the towers were the New York skyline snow globes that street merchants were peddling beside "I Love New York" T-shirts, FDNY hats, and red, white and blue plastic roses.
So the throngs settled for snatches of the memorial service: the brief sight of the president's car as his motorcade passed or the reflections off nearby buildings.
But for some, that glimpse was all that was needed to bring back powerful memories.
Long Island native Frank Meehan didn't see inside the fence that marks the area where his nephew died last year. But Meehan, who sat across the street from the memorial Wednesday with his head buried in his arms, knows that place all too well.