More than 150,000 people are already without electricity along the Gulf Coast and thousands more have been overtaken by the storm.
Mississippi, Alabama and Florida panhandles are expected to receive between 10 and 20 inches of rain, with varying amounts of 30 inches possible.
The slow moving nature of the storm also means that storm force winds and storm surges will last longer, especially to the east of the storm center.
Flooding with 6 to 10 inches of rain can be seen in Georgia and the Carolinas this weekend as the storm moves inland and weakens.
Extensive power outage and water repair delayed
Sally’s roadways are also experiencing water shortages as conditions are unsafe for repairing utilities due to the storm.
The Escambia County Utilities Authority issued an alert on Tuesday that they are unable to respond to a significant water main break at Pensacola Beach due to storm conditions ahead of the salab and the closure of the bridge.
According to the ECUA, the water system would have to be shut down at around 11:00 am as storm and tidal levels would also burn the sewer collection system.
The notice stated, “We urge residents who are still on Pensacola Beach to store water. The crew will be dispatched by ECUA to locate the brakes and make repairs as soon as possible.”
Businesses and military bases restrict access
Walmart spokesman Scott Pope told CNN on Tuesday that the business was also being shut down due to the storm, because of Walmart’s Sally.
“We are tracking the storm in real time and have activated our Emergency Operations Center to support our allies in the affected areas,” Dope said.
Across the Gulf Coast, three military installations have announced that only mission essential personnel should report to work on Wednesday.
The installations are Naval Air Station Penasacola in Escombia County, Florida, Kessler Air Force Base in Biloxi, Mississippi, and Eglin Air Force Base in Pensacola.
Keslar is home to the 53rd Weather Reconnaissance Squadron often called the “Storm Hunters”.
Evacuating and preparing residents
Mandatory evacuations have been ordered from Mississippi to most of Florida’s coast and lowlands. Shelters have been opened to accommodate those empty spaces.
People have been preparing for Sally since the weekend, filling sandbags, hauling supplies and getting their homes ready.
Meryl Warren of Summerdale, Alabama, which sits about 16 miles inland from the bay, told CNN that he brought in furniture, bought gas and other supplies, and got his generator ready for the storm.
He reported Tuesday night that heavy rain and winds up to 39 mph had already hit the inland. Warren said he is more concerned about rain and growth potential than anything.
“It’s not the first Category 1 hurricane I’ve been through. I’ve been there through Hurricane Nate and Tropical Storm Gordon,” Warren said. “I’m more concerned about rain for this one … rain and storm surges are definitely going to be a big issue with hurricanes at a speed of 2 mph.”
CNN’s Devon Sayers, Joe Sutton, Sharif Paget, Michael Guy, Dave Heinen, Rebekah Rees, Kay Jones and Amanda Jackson contributed to this report.