Landfall (Carole Pope Album)
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Landfall is the event of a storm moving over land after being over water. More broadly, and in relation to human travel, it refers to 'the first land that is reached or seen at the end of a journey across the sea or through the air, or the fact of arriving there.


Tropical cyclone

A
tropical cyclone A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depend ...
is classified as making landfall when the center of the storm moves across the coast; in a relatively strong tropical cyclone, this is when the center of its
eye Eyes are organs of the visual system. They provide living organisms with vision, the ability to receive and process visual detail, as well as enabling several photo response functions that are independent of vision. Eyes detect light and conv ...
moves over land. This is where most of the damage occurs within a mature tropical cyclone, such as a typhoon or hurricane, as most of the damaging aspects of these systems are concentrated near the eyewall. Such effects include the peaking of the
storm surge A storm surge, storm flood, tidal surge, or storm tide is a coastal flood or tsunami-like phenomenon of rising water commonly associated with low-pressure weather systems, such as cyclones. It is measured as the rise in water level above the n ...
, the core of strong winds coming ashore, and heavy flooding
rains Rains may refer to: Surname *Rains (surname) Places * Rains, South Carolina, an unincorporated community in Marion County, South Carolina * Rains County, Texas, a county in East Texas Entertainment * ''The Rains'', a 2016 zombie novel by Gregg Hu ...
. These coupled with high surf can cause major
beach erosion Coastal erosion is the loss or displacement of land, or the long-term removal of sediment and rocks along the coastline due to the action of waves, currents, tides, wind-driven water, waterborne ice, or other impacts of storms. The landward ...
. When a tropical cyclone makes landfall, the eye usually closes in upon itself due to negative environmental factors over land, such as
friction Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: *Dry friction is a force that opposes the relative lateral motion of t ...
with the terrain, which causes surf to decrease, and drier continental air.
Maximum sustained wind The maximum sustained wind associated with a tropical cyclone is a common indicator of the intensity of the storm. Within a mature tropical cyclone, it is found within the eyewall at a distance defined as the radius of maximum wind, or RMW. Unl ...
s will naturally decrease as the cyclone moves inland due to frictional differences between water and land with the free
atmosphere An atmosphere () is a layer of gas or layers of gases that envelop a planet, and is held in place by the gravity of the planetary body. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low. A s ...
. Landfall is distinct from a ''direct hit''. A direct hit is where the core of high winds (or eyewall) comes onshore but the center of the storm may stay offshore. The effects of this may be quite similar to landfall, as this term is used when the radius of maximum wind within a tropical cyclone moves ashore. These effects are high surf, heavy rains that may cause flooding, minor storm surge, coastal erosion, high
winds Wind is the natural movement of air or other gases relative to a planet's surface. Winds occur on a range of scales, from thunderstorm flows lasting tens of minutes, to local breezes generated by heating of land surfaces and lasting a few hou ...
, and possibly severe thunderstorms with tornadoes around the periphery. Storms, e.g., tropical cyclones, can be quite large. Potentially, dangerous winds, rain, and flooding may impact an area near the center of the storm, though technically landfall may not have occurred. Accordingly, it may be helpful to gauge the anticipated impact of such storms, to be aware of their general location and landmasses adjacent to the major thrust of the storm.


Tornado or waterspout

When a tornadic
waterspout A waterspout is an intense columnar vortex (usually appearing as a funnel cloud, funnel-shaped cloud) that occurs over a body of water. Some are connected to a cumulus congestus cloud, some to a cumuliform cloud and some to a cumulonimbus clou ...
makes landfall, it is reclassified as a
tornado A tornado is a violently rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. It is often referred to as a twister, whirlwind or cyclone, altho ...
, which can subsequently cause damage to areas inland. When a fair weather waterspout makes landfall, it usually dissipates quickly due to
friction Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: *Dry friction is a force that opposes the relative lateral motion of t ...
and a reduction in the amount of warm air supplied to the funnel.Bruce B. Smith (2009)
Waterspouts.
Retrieved on 2009-02-05.


See also

*
Rainband A rainband is a cloud and precipitation structure associated with an area of rainfall which is significantly elongated. Rainbands can be stratiform or convective, and are generated by differences in temperature. When noted on weather radar ima ...


References

{{reflist Tropical cyclone meteorology