Flood Watch
from FRI 11:00 AM MST until SAT 11:00 PM MST, Coconino Plateau, Yavapai County Mountains, Little Colorado River Valley in Coconino County, Little Colorado River Valley in Navajo County, Little Colorado River Valley in Apache County, Western Mogollon Rim, Eastern Mogollon Rim, White Mountains, Northern Gila County, Yavapai County Valleys and Basins, Oak Creek and Sycamore Canyons, Western Pima County including Ajo/Organ Pipe Cactus National Monument, Tohono O'odham Nation including Sells, Upper Santa Cruz River and Altar Valleys including Nogales, Tucson Metro Area including Tucson/Green Valley/Marana/Vail, South Central Pinal County including Eloy/Picacho Peak State Park, Southeast Pinal County including Kearny/Mammoth/Oracle, Upper San Pedro River Valley including Sierra Vista/Benson, Eastern Cochise County below 5000 ft including Douglas/Wilcox, Upper Gila River and Aravaipa Valleys including Clifton/Safford, White Mountains of Graham and Greenlee Counties including Hannagan Meadow, Galiuro and Pinaleno Mountains including Mount Graham, Chiricahua Mountains including Chiricahua National Monument, Dragoon/Mule/Huachuca and Santa Rita Mountains including Bisbee/Canelo Hills/Madera Canyon, Santa Catalina and Rincon Mountains including Mount Lemmon/Summerhaven, Baboquivari Mountains including Kitt Peak, Kofa, Central La Paz, Aguila Valley, Southeast Yuma County, Gila River Valley, Northwest Valley, Tonopah Desert, Gila Bend, Buckeye/Avondale, Cave Creek/New River, Deer Valley, Central Phoenix, North Phoenix/Glendale, New River Mesa, Scottsdale/Paradise Valley, Rio Verde/Salt River, East Valley, Fountain Hills/East Mesa, South Mountain/Ahwatukee, Southeast Valley/Queen Creek, Superior, Northwest Pinal County, West Pinal County, Apache Junction/Gold Canyon, Tonto Basin, Mazatzal Mountains, Pinal/Superstition Mountains, Sonoran Desert Natl Monument, San Carlos, Dripping Springs, Globe/Miami, Southeast Gila County

Pfizer will supply around 600 immunization sites across country in coming days

An illustration picture shows vials with Covid-19 Vaccine stickers attached, with the logo of US pharmaceutical company Pfizer, on November 17, 2020. (Photo by JUSTIN TALLIS/AFP via Getty Images)

Pfizer’s coronavirus vaccine will roll out across the United States starting Sunday, with further deliveries planned for Tuesday and Wednesday.

The first wave of deliveries will see 150 locations supplied with the Pfizer-BioNTech’s COVID-19 vaccine, and a further 450 sites will see supplies in the second shipment.

The vaccine is timed to arrive Monday morning so that health workers can receive the shot before administering it themselves.

The Centers for Disease Control and Prevention Advisory Committee on Immunization Practices met on Saturday to finalize and accept the language for guidelines regarding the distribution of the vaccine, though governors and state health departments will have the final say as to how they will prioritize immunizations.

RELATED: States could receive COVID-19 vaccine on Monday

Initially, about 3 million shots are expected to be shipped nationwide, according to officials with Operation Warp Speed. A similar amount is to be held in reserve for those recipients’ second dose.

The first doses will ship from Pfizer’s manufacturing plant in Kalamazoo, Mich.

The greatest challenge Pfizer faces is the storage requirements: The vaccine needs to be kept at -94 degrees Fahrenheit. The company has developed dry ice containers to address the issue.

The Associated Press contributed to this report.