The National Weather Service (NWS), once known as the Weather Bureau, is a part of National Oceanic and Atmospheric Administration (NOAA) of the United States government. It is headquartered in Silver Spring, Maryland.
The NWS is tasked with providing forecasts, public warnings, and other products to organizations and the public for the purposes of protection, safety, and general information. This is done through a collection of national and regional centers, and 122 local weather forecast offices (WFOs). As the NWS is a government agency, most of its products are in the public domain and available free of charge.
Lightning strikes are electrical discharges on a massive scale between the atmosphere and an earth-bound object. They mostly originate in thunderclouds and terminate on the ground, called Cloud to Ground (CG) lightning. However, upward propagating lightning may also be initiated from a very tall grounded object and reach into the clouds.
Although "a lightning strike" is commonly used to describe all lightning, it is rather erroneous and a misnomer, as only about 25% of all lightning events worldwide are CG. The large bulk of lightning events are Intracloud (IC) or Cloud to Cloud (CC), where discharges only occur high in the atmosphere.
Strike action, also called labor strike, on strike, greve (of French: grève), or simply strike, is a work stoppage caused by the mass refusal of employees to work. A strike usually takes place in response to employee grievances. Strikes became common during the Industrial Revolution, when mass labor became important in factories and mines. In most countries, strike actions were quickly made illegal, as factory owners had far more political power than workers. Most western countries partially legalized striking in the late 19th or early 20th centuries.
Strikes are sometimes used to pressure governments to change policies. Occasionally, strikes destabilize the rule of a particular political party or ruler; in such cases, strikes are often part of a broader social movement taking the form of a campaign of civil resistance. A notable example is the 1980 Gdańsk Shipyard strike led by Lech Wałęsa. This strike was significant in the long campaign of civil resistance for political change in Poland, and was an important mobilized effort that contributed to the fall of the Iron Curtain and the end of communist party rule in eastern Europe.
A lightning detector is a device that detects lightning produced by thunderstorms. There are three primary types of detectors: ground-based systems using multiple antennas, mobile systems using a direction and a sense antenna in the same location (often aboard an aircraft), and space-based systems.
The device was invented in 1894 by Alexander Stepanovich Popov. It also was the first radio receiver in the world.
A lightning rod (US, AUS) or lightning conductor (UK) is a metal rod or metallic object mounted on top of a building, electrically bonded using a wire or electrical conductor to interface with ground or "earth" through an electrode, engineered to protect the building in the event of lightning strike. If lightning hits the building it will preferentially strike the rod and be conducted to ground through the wire, instead of passing through the building, where it could start a fire or cause electrocution.
A lightning rod is a single component in a lightning protection system. Lightning rods are also called finials, air terminals or strike termination devices. The lightning rod requires a connection to earth to perform its protective function. Lightning rods come in many different forms, including hollow, solid, pointed, rounded, flat strips or even bristle brush-like. The main attribute of all lightning rods is they are conductive.
Atmospheric dynamics (category)
Weather (category) · (portal)