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One shot doses of the Johnson & Johnson COVID-19 vaccine are prepared at a clinic targeting immigrant community members on March 25, 2021 in Los Angeles, California.  The clinic, run by the St. John's Well Child and Family Center, estimates it has vaccinated more than 100,000 people in the Los Angeles area amid reports of two undocumented women who were refused coronavirus vaccinations in Orange County Rite Aid stores. Rite Aid has called the refusals mistakes in a written statement.  (Photo by Mario Tama/Getty Images)
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One shot doses of the Johnson & Johnson COVID-19 vaccine are prepared at a clinic targeting immigrant community members on March 25, 2021 in Los Angeles, California. The clinic, run by the St. John's Well Child and Family Center, estimates it has vaccinated more than 100,000 people in the Los Angeles area amid reports of two undocumented women who were refused coronavirus vaccinations in Orange County Rite Aid stores. Rite Aid has called the refusals mistakes in a written statement. (Photo by Mario Tama/Getty Images)
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A Northwell Health medical staff member prepares a dose of the Johnson & Johnson coronavirus (COVID-19) at the Northwell Health pop-up coronavirus (COVID-19) vaccination site at the Albanian Islamic Cultural Center in Staten Island on April 08, 2021 in New York City. NYC continues to have a 6.55 percent coronavirus (COVID-19) cases on a seven-day rolling average as the city continues to ramp up vaccinations. The city last week set a record of 524,520 coronavirus (COVID-19) vaccinations. (Photo by Michael M. Santiago/Getty Images)
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NEW YORK, NEW YORK - APRIL 08: A Northwell Health medical staff member prepares a dose of the Johnson & Johnson coronavirus (COVID-19) at the Northwell Health pop-up coronavirus (COVID-19) vaccination site at the Albanian Islamic Cultural Center in Staten Island on April 08, 2021 in New York City. NYC continues to have a 6.55 percent coronavirus (COVID-19) cases on a seven-day rolling average as the city continues to ramp up vaccinations. The city last week set a record of 524,520 coronavirus (COVID-19) vaccinations. (Photo by Michael M. Santiago/Getty Images)
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(CNN) —  

States will receive more doses of Covid-19 vaccines than they “have ever received before” in the coming days, Andy Slavitt, a senior adviser to the White House Covid-19 response team, said Friday.

Slavitt told CNN’s Wolf Blitzer that after severe winter weather delayed shipments of vaccines, “things are moving back to normal,” and that 1.85 million Americans received vaccinations on Friday.

“Starting tomorrow, Saturday, we’re going to be shipping more doses than states have ever received before,” Slavitt said. “Because we’re going to be shipping this week’s doses and next week’s doses.”

Slavitt said it means that “for all the governors and all the states that have said we want more vaccines, they’re going to have to be ready, they’re going to have to make more appointments, they’re going to have to extend their hours.”

“We’re really hoping everybody pulls together, because the country together can get us back on track,” he added. “And we’re going to do our part by getting these vaccines out starting this weekend and over the next couple of days.”

News of the bulked up shipments comes after White House press secretary Jen Psaki said Thursday that the White House was working to move up scheduled deliveries, surge shipment operations and potentially extend hours at vaccination sites in light of extreme weather in parts of the country, including a hard-hit Texas, causing delays in Covid-19 vaccine shipments and deliveries.

Slavitt said during a White House news briefing earlier Friday that there is a backlog of about 6 million Covid-19 vaccine doses due to bad weather in parts of the country and that all 50 states have been affected. More than 2,000 vaccine sites are located in areas with power outages and unable to receive doses, he said, citing expiration concerns.

FedEx acknowledged that it was making Saturday deliveries, but has not told CNN how many sites it plans to deliver to on Saturday.

Approximately 165,000 Texas households remained without power Friday, Texas Gov. Greg Abbott said during a news conference.

Speaking to Blitzer on Friday, Slavitt also cautioned against putting too much stock in data showing that a single dose of the two-dose vaccines may be enough to offer protection against Covid-19, saying that if there’s “one thing that I have learned over the last year is to be careful with the single headline study reports.”

Asked about the high number of US service members who have so far refused doses of the vaccine, Slavitt said it was important not to “overreact or underreact to news about people on the first go around decided not to take the vaccine.”

“There are indeed a number of people that want to just wait and see what happens when other people take the vaccine. That’s perfectly reasonable stance,” he said, adding, “We can be, I think, confident that as more and more time goes on, more and more people will choose to take the vaccine.”

He added that it was “important that if they have a legitimate question about the vaccine, they not be ostracized.”

CNN’s Kate Sullivan and Gregory Wallace contributed to this report.