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FLASH_FLOOD

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Safety and Preparedness

What to do before (Preparedness):

  • Become familiar with what a Flash Flood Watch or Warning means.
  • Know the county in which you live and the names of nearby major cities.
  • Know nearby rivers and creeks and even what watershed you live in.
  • Have a NOAA Weather Radio available and check the batteries.
  • Have a plan on what to do when a watch or warning is issued for your county or your city is included.
  • Understand that if roads are flooded, "turn around don't drown"

What to do during (Safety):

  • If driving and it appears that the road is flooded or if baracades are securing the road, "turn around don't drown"
  • Don't wait to move to higher ground if flooding approaches.
  • Move property to higher ground if needed.

Threat levels and suggested actions:

green light=no threat
Occasionally check forecasts for updates on thunderstorm potential.
yellow light=limited threat
flooding is possible. Be aware of any thunderstorm development and movement.
red light=elevated threat
flooding is likely. Closely monitor radar trends and consider moving property out of areas that are easily flooded.
purple light=significant threat
flooding is expected. Move property out of low lying or poor drainage areas and be prepared to move to higher ground if needed.
black light=critical threat
Widespread flooding. Move to higher ground and if possible get property out of low lying or poor drainage areas.
Flood Safety Links
Turn Around Don't Drown
Noaa Flood Information

Legend and Definitions


  • The Flash Flood threat level is based on ground conditions and the amount of rainfall that is forecast.
  • Flash Flood guidance contains information on ground conditions and how much rainfall will cause flooding.
  • The amount of rainfall forecast is based on expected coverage, intensity and duration of Thunderstorms.
  • The value used is the probablility of exceeding 3 hour flash flood guidance and is calculated using an expected exponential distribution of rainfall across the area (more information).
green light=no threatNil  Flash flood potential < 5%
Forecast conditions are not conducive for heavy rain and flooding.
yellow light=limited threatLimted Flash flood potential 5-25%
Forecast conditions are somewhat favorable for heavy rain development and flooding.
red light=elevated threatElevated Flash flood potential 25-60%
Forecast conditions are favorable heavy rain and possible flooding
purple light=significant threatSignificant Flash flood potential 60-80%
Forecast conditions are very favorable heavy rain and possible flooding
black light=critical threatCritical Flash flood potential >80%
Widespread Flooding is expected.
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