Flash Flood Warning

A flash flood warning is a critical alert issued by the National Weather Service (NWS) indicating that a flash flood is imminent or occurring in a specific area. It signifies an extremely dangerous situation, demanding immediate action to protect life and property.

Unlike a flash flood watch, which signals that conditions are favorable for flash flooding, a warning means the flood is already happening or is highly likely to happen very soon. These warnings are geographically specific, often targeting counties or even smaller areas susceptible to rapid inundation. The NWS issues flash flood warnings based on several factors:

Heavy Rainfall: Torrential rainfall exceeding the land’s capacity to absorb water is the primary trigger. This is particularly true in areas with steep terrain, urban development (where concrete increases runoff), or already saturated ground.
Dam or Levee Failure: An unexpected breach of a dam or levee can unleash a sudden and devastating surge of water, prompting an immediate flash flood warning.
Ice Jams: Rapid melting of snow and ice can create ice jams that block rivers, causing water to back up and flood surrounding areas.
Real-Time Observations: Weather radar, stream gauges, and reports from trained spotters provide real-time information about rainfall intensity and water levels, allowing the NWS to pinpoint areas at greatest risk.

When a flash flood warning is issued, it is vital to take immediate precautions. The primary objective is to move to higher ground. Heed the following advice:

Get to Higher Ground: Immediately evacuate low-lying areas, such as river valleys, floodplains, and areas with poor drainage. Seek shelter on higher ground well away from streams, creeks, rivers, and drainage channels.
Never Drive Through Floodwaters: “Turn Around, Don’t Drown” is the mantra. Even shallow water can be deceptive. Just six inches of moving water can sweep away an adult, and two feet of rushing water can carry away most vehicles, including SUVs and trucks. The road beneath the water could be washed away, making it even more dangerous.
Monitor Weather Alerts: Stay informed by listening to NOAA Weather Radio, watching local news broadcasts, or using weather apps on your smartphone. These sources will provide updated information on the warning, including its duration and affected areas.
Be Aware of Your Surroundings: Pay attention to changing water levels and weather conditions. Even if it’s not raining where you are, runoff from upstream could cause a flash flood.
Stay Away from Floodwaters: Floodwaters can be contaminated with sewage, chemicals, and debris. Avoid contact with floodwaters to prevent illness and injury.
Report Flooding: If you witness flash flooding, report it to local authorities. Your report can help them assess the situation and provide assistance to those in need.

Ignoring a flash flood warning can have deadly consequences. Time is of the essence, so be prepared to act quickly and decisively to protect yourself and your loved ones. Remember, a flash flood warning is a call for immediate action – don’t hesitate, seek higher ground!