ST. PETERSBURG, Fla. — Eta remained a tropical storm Wednesday afternoon as it prepared to skirt past the heavily populated Tampa Bay region in Florida and crash ashore in the coming hours somewhere to the north along the Gulf of Mexico coast.

The storm’s maximum sustained winds remained at about 70 mph off Florida’s west coast as the storm moved northward, according to the National Hurricane Center in Miami. Additional weakening was possible as Eta approaches the coast.

Forecasters had posted — but later discontinued — a hurricane watch for a 120-mile stretch that includes Tampa and St. Petersburg. Eta had briefly attained hurricane strength Wednesday morning but then weakened. Subsequently, a tropical storm warning was issued for the same general area.

The storm has been in the Gulf of Mexico since crossing over South Florida on Sunday. At 4 p.m. Wednesday, Eta was located 85 miles south of St. Petersburg and was moving north at 12 mph, the hurricane center reported.

The Tampa Bay region is home to more than 3.5 million across five coastal counties. No mandatory evacuations were immediately ordered, but authorities began opening shelters for anyone needing them. No serious damage or flooding was immediately reported.

Tampa Mayor Jane Castor said special care is taken at shelters to protect people from the coronavirus, such as social distancing, and suggested people bring their own masks.

“Everything will be done to make sure all of our residents are safe,” Castor said.

The forecast prompted school officials in Pinellas and Pasco counties, which includes St. Petersburg, to send students home early Wednesday. Both counties announced schools would remain closed Thursday, as did neighboring Hillsborough County.

The Florida Highway Patrol closed the Sunshine Skyway Bridge that links Pinellas and Manatee counties because of high winds. Tampa International Airport tweeted that it suspended operations at 3 p.m. Wednesday.

In Pasco County, officials set up four do-it-yourself locations for people to fill sandbags. In Tampa, the Busch Gardens theme park announced it was closed Wednesday, and several Veterans Day events in the area were canceled.

Florida Gov. Ron DeSantis issued an expanded emergency declaration to include 13 counties along or near the Gulf Coast, adding them to South Florida counties. DeSantis also asked for an early emergency order from the Federal Emergency Management Agency to free resources needed to tackle the storm.

A coronavirus testing site at Tropicana Field was also closed Wednesday.

The hurricane center said “life-threatening storm surge” is possible early Thursday, and forecasters advised residents to heed warnings from local officials. Tropical storm-force winds are expected in the area by late Wednesday.

Forecasts call for more rain from the storm system over parts of already-drenched South Florida.