With the storm next entering the eastern part of the Gulf of Mexico, which has warm water and favorable atmospheric conditions, “there is a real possibility that Michael will strengthen to a major hurricane before landfall,” Robbie Berg, a hurricane specialist at the Miami-based storm forecasting hub, wrote in an advisory.

A large mound of sand in Tallahassee was whittled down to a small pile within hours Monday as residents filled sandbags against potential flooding.

Tallahassee Mayor Andrew Gillum, Florida’s Democratic nominee for governor, filled sandbags with residents and urged residents of the state capital city to finish up emergency preparations quickly. Local authorities fear power outages and major tree damage from Michael.

“Today it is about life and safety,” Gillum said. “There’s nothing between us and this storm but warm water’ and I think that’s what terrifies us about the potential impacts.”

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Fineout reported from Tallahassee, Florida.