Flash floods generally cause greater loss of life and river floods generally cause greater loss of property. Issued to inform public if general area wide flooding is expected. A Flood Warning is issued when flooding is imminent or occurring. It does not mean flooding will occur, but it is possible. The normally tranquil streams and creeks in your neighborhood or area can become raging torrents if heavy rain falls overhead - or even upstream of your location! Flash Flooding can also occur on city streets and highway underpasses. There are two basic types of floods: flash floods and the more widespread river floods. A Flood Watch is issued when conditions are favorable for flooding. WHERE DOES FLASH FLOODING STRIKE? Flash Flooding is possible everywhere. What does the word areal mean Definition: The adjective version of the noun area is called areal. When storms have good movement and drop heavy rain, an areal flood warning is usually issued. If people are at their homes or businesses, the water may rise quickly and trap them, or cause damage to the property without them having a chance to protect the property.īrowse to the Advanced Hydrologic Prediction Service (AHPS) to research possible flooding areas, warnings, and gauge readings for local conditions. Areal Flood Warning is a warning that warns motorists about standing puddles of water on the road. Their situation may become dangerous if they encounter high, fast-moving water while traveling. The impervious surfaces in the urban areas do not allow water to infiltrate the ground, and the water runs off to the low spots very quickly.įlash Flooding occurs so quickly that people are caught off-guard. Urban Areas are also prone to flooding in short time-spans and, sometimes, rainfall (from the same storm) over an urban area will cause flooding faster and more-severe than in the suburbs or countryside. The intensity of the rainfall, the location and distribution of the rainfall, the land use and topography, vegetation types and growth/density, soil type, and soil water-content all determine just how quickly the Flash Flooding may occur, and influence where it may occur. These winds may be accompanied by storm surge, coastal flooding, and/or river flooding. Flash Floods can occur due to Dam or Levee Breaks, and/or Mudslides (Debris Flow). A Tropical Storm Warning is issued when sustained winds of 34 to 63 kt (39 to 73 mph) or higher associated with a tropical cyclone are expected in 36 hours or less. Flooding that begins within 6 hours, and often within 3 hours, of the heavy rainfall (or other cause).įlash Floods can be caused by a number of things, but is most often due to extremely heavy rainfall from thunderstorms.
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