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Flooding is the most common natural disaster in the United States. With many low-lying areas, the St. Johns River, and other waterways, Duval County is always at risk for flooding regardless of whether a tropical cyclone is affecting our area. The impact of a tropical cyclone can vary depending on the amount of rainfall, wind intensity, high or low tide, storm surge, and wave characteristics. The St. Johns River flows north toward the Atlantic Ocean. As a storm approaches, water begins to back up the river, slowing down its flow into the Atlantic Ocean. When paired with high tides and rainfall, widespread flooding is a significant threat.
Flood Alerts & Warnings
Flash Flood Watch
Be Prepared
A Flash Flood Watch is issued to indicate current or developing conditions that are favorable for flash flooding. The occurrence is neither certain nor imminent. A watch is typically issued within several hours to days ahead of the onset of possible flash flooding.
Flash Flood Warning
Take Action!
A Flash Flood Warning is issued to inform the public, emergency management and other cooperating agencies that flash flooding is in progress, imminent, or highly likely. Flash Flood Warnings are urgent messages as dangerous flooding can develop very rapidly, with a serious threat to life and/or property. Flash Flood Warnings are usually issued minutes to hours in advance of the onset of flooding.
Flood Watch
Be Prepared
A Flood Watch is issued to indicate current or developing conditions that are favorable for flooding. The occurrence is neither certain nor imminent. A watch is typically issued within several hours to days ahead of the onset of possible flooding. In situations where a river or stream is expected to be the main source of the flooding, forecast confidence may allow for a Flood Watch to be issued several days in advance.
Flood Warning
Take Action
A Flood Warning is issued to inform the public of flooding that poses a serious threat to life and/or property. A Flood Warning may be issued hours to days in advance of the onset of flooding based on forecast conditions. Floods occurring along a river usually contain river stage (level) forecasts.
Floodwater Facts
  • Six inches of moving water can knock over an adult
  • Two feet of moving water can carry away most vehicles
  • Floodwater can be electrically charged and very dangerous if there are downed power lines
  • Floodwater can contain debris, sharp objects, sewage, and microorganisms
  • Floodwater can hide holes or other hazards under its surface
Prepare For A Storm
Understand Your Flood Risk Insure Your Property Maintain Your Property
  • Remove debris from gutters and downspouts.
  • Clear debris from catch basins.
  • Prune trees and shrubs.
  • Bring outdoor furniture and decorations inside.
  • Secure or bring garbage bins inside.
  • Photograph your property for insurance purposes.

 
During A Flood
Avoid Floodwaters
  • Move to higher ground.
  • Don’t walk or drive through flood waters. 
  • If water rises around your car, abandon the car immediately.
Avoid Contact With Electricity
  • Don’t touch electrical equipment. Every source of electricity can be dangerous during or after a flood.
Don't Drive Through Floodwaters
  • Remember- Turn Around, Don't Drown!
 
After A Flood
  • Return home only when officials have declared the area safe.
  • Before entering your home, look outside for loose power lines, damaged gas lines, foundation cracks or other damage.
  • Parts of your home may be collapsed or damaged. Approach entrances carefully.
  • Watch out for wild animals, especially poisonous snakes that may have come into your home with the floodwater.
  • If you smell natural or propane gas or hear a hissing noise, leave immediately and call the fire department.
  • If power lines are down outside your home, do not step in puddles or standing water.
  • Keep children and pets away from floodwater.
  • Make sure your food and water are safe before eating, drinking or washing.
  • Do not use water that could be contaminated.
  • Photograph damage to your property for insurance purposes.