flood

Interactive map of weather hazard warnings in the United States

The National Oceanic and Atmospheric Administration's National Weather Service Watch, Warning, and Advisory Display map shows up-to-date weather warnings and advisories for the continental U.S. The map covers a wide range of weather hazards including tornadoes, thunderstorms, hurricanes, tropical storms, flash and coastal floods, blizzards, winter storms, snow, freezing rain and ice storms, and high winds.

Users can click on individual parts of the map for more specific information down to the county level.

Interactive map of Virginia's geology and natural resources

The Virginia Department of Mines, Minerals, and Energy provides a large amount of information on Virginia's geology and natural resources in interactive map form, including:

  • Surface geology
  • Geothermal suitability
  • Sinkholes
  • Water wells
  • Mineral resources and mining operations
  • Topographic maps and aerial imagery

The map allows users to select multiple layers that can be overlain on each other. By doing this, users can see how different features are related.

Flood Basics

Why do floods matter?

Flooding is the most common, and costliest, natural hazard facing the United States. The National Weather Service published reports on flood damages and deaths until 2014. From 1984 to 2014 floods caused an average of $8 billion in damages and 82 deaths per year nationwide.[1]

Does flood risk for a particular location change over time?

FEMA National Flood Insurance Program:  

"Flood risk can, and does, change over time. Flood risks change for many reasons: new development, changes in levee classification, and environmental changes, to name a few. As a result FEMA is updating flood hazard maps across the country. These new flood maps, also, known as Digital Flood Insurance Rate Maps (DFIRMs), show flood risk at a property-by-property level.

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