English Subtitles for What is FLASH FLOOD? What does FLASH FLOOD mean? FLASH FLOOD meaning, definition & explanation



Subtitles / Closed Captions - English

a flash flood<font color="#E5E5E5"> is a rapid flooding of</font>

geomorphic low-lying areas washes rivers dry<font color="#E5E5E5"> lakes and basins it may be caused by</font> heavy rain associated with a severe thunderstorm hurricane tropical storm<font color="#CCCCCC"> or</font> <font color="#E5E5E5">meltwater from ice or snow flowing over</font> ice sheets or snow fields flash floods

may occur after the collapse of a natural ice or debris dam or a human structures such as a man-made them as occurred before the Johnstown Flood of 1889 flash floods are distinguished from <font color="#E5E5E5">regular floods by a timescale of less</font>

<font color="#CCCCCC">than six hours the water that</font><font color="#E5E5E5"> is</font> temporarily available is often used by foliage with rapid germination and short growth cycles and by specially adapted animal life flash floods can occur under several types of conditions flash

flooding occurs when it rains rapidly unsaturated soil or dry soil that has poor absorption ability the runoff collects in gullies and streams and as they joined to form larger volumes often forms a fast-flowing front of water and

debris flash floods most often occur in normally dry areas that have<font color="#E5E5E5"> recently</font> received precipitation<font color="#E5E5E5"> but they may be</font> seen anywhere downstream from<font color="#CCCCCC"> the source</font> of the precipitation even many miles from the source in areas on or near

volcanoes flash floods have also occurred after eruptions when glaciers have been melted by the<font color="#E5E5E5"> intense heat</font> flash floods are known to occur in<font color="#CCCCCC"> the</font> <font color="#CCCCCC">highest mountain ranges of the United</font> <font color="#CCCCCC">States and are also common in the arid</font>

plains of the southwestern United States flash flooding can also be caused by extensive rainfall released by hurricanes and other tropical storms as well as the sudden thawing effect of ice dams human activities can also cause

flash floods to occur<font color="#CCCCCC"> when</font><font color="#E5E5E5"> downs</font> constructed for hydroelectricity fail a large quantity<font color="#CCCCCC"> of water can be released</font> and destroy everything in its<font color="#E5E5E5"> path the</font> United States National Weather Service gives the advice turn around don't drown

for flash floods that is it recommends that people get<font color="#E5E5E5"> out of the area of a</font> flash flood rather than trying<font color="#E5E5E5"> to cross</font> it many people tend to<font color="#E5E5E5"> underestimate the</font> dangers<font color="#CCCCCC"> of flash floods what makes flash</font> floods most dangerous as<font color="#E5E5E5"> their</font><font color="#CCCCCC"> sudden</font>

<font color="#CCCCCC">nature and fast-moving water a vehicle</font> <font color="#E5E5E5">provides little to no protection against</font> being swept away it may make people overconfident and less likely to avoid the flash flood more than half of the fatalities<font color="#E5E5E5"> attributed to flash floods</font>

our people swept away in vehicles when trying<font color="#CCCCCC"> to</font><font color="#E5E5E5"> cross flooded intersections as</font> little<font color="#E5E5E5"> as two feet 0.61 meters of water</font> is enough to carry away most SUV size vehicles the US National<font color="#CCCCCC"> Weather Service</font> reported in 2005's using a national

<font color="#CCCCCC">30-year average more people die yearly</font> in floods 127 on average than by lightning 73 tornadoes 65 or hurricanes 16 in deserts flash floods can be <font color="#E5E5E5">particularly deadly for several reasons</font> first storms<font color="#E5E5E5"> in arid regions are</font>

infrequent but<font color="#E5E5E5"> they can deliver an</font> enormous amount<font color="#E5E5E5"> of water in a very short</font> time second these rains often fall on poorly absorbent<font color="#E5E5E5"> and often</font><font color="#CCCCCC"> clay like</font> soil which greatly increase the<font color="#E5E5E5"> amount</font> of runoff<font color="#CCCCCC"> that rivers and</font><font color="#E5E5E5"> other water</font>

channels have to handle these regions tend not to<font color="#CCCCCC"> have the infrastructure that</font> wetter regions have to divert water from structures and roads such as storm drains culverts and retention basins either because of sparse population

poverty or because residents<font color="#E5E5E5"> believe the</font> risk of flash floods is not high enough to justify the expense in fact in some areas desert roads frequently cross dry river and creek beds without bridges from the<font color="#E5E5E5"> driver's perspective there may</font>

be clear when the river unexpectedly forms ahead of or around the vehicle<font color="#E5E5E5"> in a matter of</font> seconds finally the lack of regular rain to clear water channels may cause flash floods and deserts<font color="#E5E5E5"> to be headed by large</font>

amounts of debris such as rocks branches and logs deep slot canyons can be especially dangerous to hikers as they may be flooded<font color="#CCCCCC"> by a storm that occurs on</font> a Mesa miles away<font color="#E5E5E5"> sweeps through the</font> canyon and makes it difficult to climb

up<font color="#E5E5E5"> and out</font><font color="#CCCCCC"> of</font><font color="#E5E5E5"> the way to avoid the flood</font> [Music]



Video Description

What is FLASH FLOOD? What does FLASH FLOOD mean? FLASH FLOOD meaning - FLASH FLOOD definition - FLASH FLOOD explanation.

Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.

A flash flood is a rapid flooding of geomorphic low-lying areas: washes, rivers, dry lakes and basins. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, tropical storm, or meltwater from ice or snow flowing over ice sheets or snowfields. Flash floods may occur after the collapse of a natural ice or debris dam, or a human structure such as a man-made dam, as occurred before the Johnstown Flood of 1889. Flash floods are distinguished from regular floods by a timescale of less than six hours. The water that is temporarily available is often used by foliage with rapid germination and short growth cycles, and by specially adapted animal life.

Flash floods can occur under several types of conditions. Flash flooding occurs when it rains rapidly on saturated soil or dry soil that has poor absorption ability. The runoff collects in gullies and streams and, as they join to form larger volumes, often forms a fast flowing front of water and debris.

Flash floods most often occur in normally dry areas that have recently received precipitation, but they may be seen anywhere downstream from the source of the precipitation, even many miles from the source. In areas on or near volcanoes, flash floods have also occurred after eruptions, when glaciers have been melted by the intense heat. Flash floods are known to occur in the highest mountain ranges of the United States and are also common in the arid plains of the Southwestern United States. Flash flooding can also be caused by extensive rainfall released by hurricanes and other tropical storms, as well as the sudden thawing effect of ice dams. Human activities can also cause flash floods to occur. When dams, constructed for hydro-electricity, fail, a large quantity of water can be released and destroy everything in its path.

The United States National Weather Service gives the advice "Turn Around, Don't Drown" for flash floods; that is, it recommends that people get out of the area of a flash flood, rather than trying to cross it. Many people tend to underestimate the dangers of flash floods. What makes flash floods most dangerous is their sudden nature and fast-moving water. A vehicle provides little to no protection against being swept away; it may make people overconfident and less likely to avoid the flash flood. More than half of the fatalities attributed to flash floods are people swept away in vehicles when trying to cross flooded intersections. As little as 2 feet (0.61 m) of water is enough to carry away most SUV-sized vehicles. The U.S. National Weather Service reported in 2005 that, using a national 30-year average, more people die yearly in floods, 127 on average, than by lightning (73), tornadoes (65), or hurricanes (16).

In deserts, flash floods can be particularly deadly for several reasons. First, storms in arid regions are infrequent, but they can deliver an enormous amount of water in a very short time. Second, these rains often fall on poorly absorbent and often clay-like soil, which greatly increase the amount of runoff that rivers and other water channels have to handle. These regions tend not to have the infrastructure that wetter regions have to divert water from structures and roads, such as storm drains, culverts, and retention basins, either because of sparse population, poverty, or because residents believe the risk of flash floods is not high enough to justify the expense. In fact, in some areas, desert roads frequently cross dry river and creek beds without bridges. From the driver's perspective, there may be clear weather, when a river unexpectedly forms ahead of or around the vehicle in a matter of seconds. Finally, the lack of regular rain to clear water channels may cause flash floods in deserts to be headed by large amounts of debris, such as rocks, branches, and logs.

Deep slot canyons can be especially dangerous to hikers as they may be flooded by a storm that occurs on a mesa miles away, sweeps through the canyon, and makes it difficult to climb up and out of the way to avoid the flood.