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Severe Weather Awareness Week: Flood Safety

The second topic we tackle during severe weather awareness week is flooding. Flooding is often underestimated as a serious threat, but according to the National Weather Service, floodwaters claim more lives than any other thunderstorm-related hazard. In fact, it is the second most deadly weather event across the nation (just behind heat-related fatalities).

There are a lot of types of flooding, and a lot of flood watches, advisories, and warnings to address them. We're going to break each down for you below:

flash flooding: Flash flooding occurs when floodwaters accumulate quickly and with little to no warning.

Florence flooding. Photo: Brandy Senn

Flash floods are particularly dangerous because they can generate a large amount of water in a short amount of time, often that overflow into homes or roadways.

Of the fatalities the National Weather Service attributes to flooding, over half occur when a vehicle is driven into hazardous floodwater; the next highest percentage of flood-related deaths is due to walking into or near floodwaters.

Keep the following facts in mind the next time you encounter flood waters:

  • It only takes 6 inches of swiftly moving water to knock over an adult
  • it only takes 6 inches of water to stall most vehicles
  • It only takes 12 inches of rushing water to carry away a small car
  • It only takes 2 feet of rushing water to carry away even the heaviest of vehicles
  • The power of the water is so strong that it can wash away the road beneath it, even if it looks like the water is calm

Flood Alerts:

Flood alerts come in various forms, including but not limited to:

  • Flood Advisory
  • Flood Watch
  • Flood Warning
  • Flash Flood Watch
  • Flash Flood Warning

A flood advisory is issued when a flood event warrants notification due to significant disruption or inconvenience, but is less urgent than a warning.

flood watch is issued when conditions are favorable for flooding to occur in the short-term future. In this case, the watch is typically issued several hours to even days ahead of the onset of the flooding event.

flood warning is issued when floodwaters may pose a serious threat to life or property. A flood warning may be issued several hours to even days in advance of the onset of flooding. Flooding that occurs near a river usually contain river stage (ie, crest level) forecasts.

flash flood watch is issued when conditions are favorable for flash flooding, and it can be issued several hours to even a few days ahead of time.

flash flood warning is issued when flash flooding is occurring or is about to occur. Flash flood warnings are considered urgent messages since dangerous flooding can happen incredibly rapidly. Flash flood warnings are often issued minutes to hours before the onset of the flash flood.

During a flood WATCH, be sure to monitor your weather radio or Live Alert 19 app for any changes in weather conditions. If you live in a flood-prone area, consider relocating to a safer place (such as a friend or family member's home) until the flood threat has ended.

During a flood WARNING, act immediately to ensure your safety. If you are outdoors, head for higher ground; if you are on the road and you encounter floodwater, turn around and either find a different route or move to a safe place until flood waters have receded.

If you witness any damage due to flooding, wait until the danger passes and then snap a picture through the Live Alert 19 app (you can also email us a photo@whnt.com). Please be sure to include your name and city/town/location. Your damage reports help ensure that forecasters at the National Weather Service as well as at WHNT News 19 provide the most detailed record of what occurred from the flood, which helps improve our forecasting abilities for future storms.

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