Walton County, located on the Florida panhandle, has already started spraying hay into the water if it arrives at the shoreline.
Investigators have been combing an Oakland shoreline park trying to find the weapon in the murky shallow water.
On Tuesday, he surveyed the shoreline in Pensacola Beach with President Obama.
It took a whole night, but in the morning a shoreline appeared to the North, and there on the strand stood a youth on look-out.
He centered the shoreline of the bay and put on maximum magnification.
The work is shown passing beneath an old timber-crib bulkhead, used for stabilizing the shoreline.
Circling the shoreline at a distance of about a mile, a curtain of mist was visible.
There seemed to be no land between its western coast and the shoreline of China.
For a moment he surveyed the shoreline from his higher vantage point.
We sailed for three days along the shoreline, then came to the mouth of a fjord or river of immense size.