It’s busy outside the Javits Center, a mass vaccination site where cars are avoiding piles of snow to drop off and pick up people getting their shots.

This comes after appointments were cancelled Monday and Tuesday because of the snow, and then rescheduled for the same time Wednesday.

"I got a message that I was rescheduled for Tuesday but then Monday night they sent me another text that it was rescheduled for today," Oren Vadas said.

Geeta Ramjattan said she was concerned when she heard the snow was cancelling appointments, but soon learned it was rescheduled.

“A bit nervous, I was worried it would take me a while to get back the appointment but it was okay, it was quick, and I was relieved it was quick," she said.

The Javits Center site has the capacity to administer more than 20,000 doses per day, but because of short supply, it hasn’t been able to do that.

However, the site was able to accommodate those whose appointments were rescheduled along with those who already had appointments for Wednesday.

"Very organized," said Joanne Cordero. "Everyone was really nice and helpful."

Vaccine hubs run by the city, which also closed because of the snow, didn’t recover as smoothly. According to officials, only one site, Newtown High School in Elmhurst Queens, opened Wednesday as expected.

The Mayor said the other 14, including IS 88 in Harlem, wouldn’t reopen until Thursday because of shortages.

"The storm results passed but the problem comes back to the same one we talked about for weeks and weeks; supply, supply, supply," de Blasio said.

Governor Cuomo said the state is expected to get an increased supply of vaccine doses from the federal government for the next three weeks, but as of now, appointments at state and city-run sites are all booked up.