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In some situations, several inches of rain can fall in a relatively short period, overwhelming drainage systems and causing normally manageable streams, creeks, and low-lying roads to fill quickly.
Urban areas can face additional problems because pavement prevents water from soaking naturally into the ground.
Instead, rainfall moves across streets, parking lots, sidewalks, and other hard surfaces.
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When drainage systems cannot keep up, water accumulates.
A road that was completely dry an hour earlier can suddenly become covered by several inches of water.
And deeper water can make travel extremely dangerous.
The Threat Is Not Just Rain
When people hear the word “storm,” they often think first about rainfall.
But powerful weather systems can bring several hazards at once.
Heavy rain may create flooding.
Strong winds can bring down trees and power lines.
Lightning can create additional dangers.
Hail can damage vehicles, roofs, windows, and crops.
In some situations, severe thunderstorms can produce tornadoes.
Coastal areas may face additional risks from storm surge, high waves, and coastal flooding.
The combination can make a major storm much more dangerous than any individual hazard suggests.
A family may be dealing with rising water while also losing electricity.
Drivers may encounter flooded roads at the same time that strong winds reduce visibility.
Emergency crews may have difficulty reaching people because multiple roads are blocked.
That is why preparation matters before the worst conditions arrive.
Why Flooding Can Happen So Quickly
Flooding is not always a slow process.
Flash flooding, in particular, can develop rapidly when intense rainfall overwhelms drainage systems, small waterways, or local terrain.
This can happen even when a person is not directly under the heaviest part of a storm.
Rain falling upstream can eventually move downstream.
Water can accumulate in low-lying areas.
Small streams can rise dramatically.
And roads that cross waterways can become dangerous surprisingly quickly.
This is one reason authorities repeatedly warn people not to drive through flooded roads.
A driver may look at the water and believe the vehicle can make it across.
But depth can be difficult to judge, and moving water can exert tremendous force.
Even relatively shallow moving water can cause a vehicle to lose traction.
Once a vehicle begins to float or shift, escaping becomes much more difficult.
“Turn Around, Don’t Drown”
The phrase has become one of the most recognizable flood-safety messages in the United States.
Its meaning is simple.
If a road is flooded, do not attempt to cross it.
Turn around.
Find another route.
Wait for conditions to improve.
A road covered by water can conceal washed-out pavement, debris, potholes, open drainage channels, or other hazards.
The water may also be deeper than it appears.
And even if another vehicle successfully crossed the same area moments earlier, that does not mean conditions remain safe.
Water levels can rise rapidly.
The safest decision is often the simplest one: do not enter.
The Danger After the Rain Begins
Another misconception is that the most dangerous moment occurs only during the heaviest rainfall.
That is not always true.
Floodwaters can continue rising after rainfall has weakened or stopped.
Water from surrounding areas may continue flowing into rivers, streams, and low-lying communities.
This can create delayed flooding.
People who believe the storm is “over” may return to roads too quickly.
That can be particularly dangerous near rivers and creeks.
Flood warnings should therefore be taken seriously even after the sky begins to clear.
Why Power Outages Are a Major Concern
Severe storms can also disrupt electricity.
Strong winds can damage power lines.
Falling trees can bring down utility infrastructure.
Lightning can contribute to outages.
In more extreme events, extensive damage may leave communities without power for extended periods.
A power outage is inconvenient under normal circumstances.
During a severe storm, however, it can become a much larger problem.