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National and Local Weather Radar, Daily Forecast, Hurricane and information from The Weather Channel and weather.com

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Radar is a detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the object(s). Radio waves (pulsed or continuous) from the transmitter reflect off the object and return to the receiver, giving information about the object's location and speed. Radar was developed secretly for military use by several nations in the period before and during World War II. A key development was the cavity magnetron in the United Kingdom, which allowed the creation of relatively small systems with sub-meter resolution. The term RADAR was coined in 1940 by the United States Navy as an acronym for RAdio Detection And Ranging. The term radar has since entered English and other languages as a common noun, losing all capitalization. The modern uses of radar are highly diverse, including air and terrestrial traffic control, radar astronomy, air-defense systems, antimissile systems, marine radars to locate landmarks and other ships, aircraft anticollision systems, ocean surveillance systems, outer space surveillance and rendezvous systems, meteorological precipitation monitoring, altimetry and flight control systems, guided missile target locating systems, and ground-penetrating radar for geological observations. High tech radar systems are associated with digital signal processing, machine learning and are capable of extracting useful information from very high noise levels. Radar is a key technology that the self-driving systems are mainly designed to use, along with sonar and other sensors.Other systems similar to radar make use of other parts of the electromagnetic spectrum. One example is LIDAR, which uses predominantly infrared light from lasers rather than radio waves. With the emergence of driverless vehicles, radar is expected to assist the automated platform to monitor its environment, thus preventing unwanted incidents.

The Weather Company is a weather forecasting and information technology company that owns and operates weather.com and Weather Underground. The Weather Company has been a subsidiary of the Watson & Cloud Platform business unit of IBM since 2016.

Information can be thought of as the resolution of uncertainty; it is that which answers the question of "what an entity is" and thus defines both its essence and nature of its characteristics. It is associated with data, as data represents values attributed to parameters, and information is data in context and with meaning attached. Information relates also to knowledge, as knowledge signifies understanding of an abstract or concrete concept.In terms of communication, information is expressed either as the content of a message or through direct or indirect observation. That which is perceived can be construed as a message in its own right, and in that sense, information is always conveyed as the content of a message. Information can be encoded into various forms for transmission and interpretation (for example, information may be encoded into a sequence of signs, or transmitted via a signal). It can also be encrypted for safe storage and communication. The uncertainty of an event is measured by its probability of occurrence and is inversely proportional to that. The more uncertain an event, the more information is required to resolve uncertainty of that event. The bit is a typical unit of information, but other units such as the nat may be used. For example, the information encoded in one "fair" coin flip is log2(2/1) = 1 bit, and in two fair coin flips is log2(4/1) = 2 bits. The concept of information has different meanings in different contexts. Thus the concept becomes related to notions of constraint, communication, control, data, form, education, knowledge, meaning, understanding, mental stimuli, pattern, perception, representation, and entropy.

"Stop and identify" statutes are statutory laws in the United States that authorize police to legally demand the identity of someone whom they reasonably suspect of having committed a crime. If there is no reasonable suspicion that a crime has been committed, is being committed, or is about to be committed, an individual is not required to provide identification, even in "Stop and ID" states.The Fourth Amendment to the United States Constitution prohibits unreasonable searches and seizures and requires any warrant to be judicially sanctioned and supported by probable cause. Terry v. Ohio, 392 U.S. 1 (1968) established that it is constitutionally permissible for police to temporarily detain a person based on an articulable reasonable suspicion that a crime has been committed, and to conduct a patdown for weapons based on a reasonable belief that the person is armed. The question whether it is constitutionally permissible for the police to demand that a detainee provide his or her name was considered by the U.S. Supreme Court in Hiibel v. Sixth Judicial District Court of Nevada, 542 U.S. 177 (2004), which held that the name disclosure did not violate the Fourth Amendment prohibition on unreasonable searches and seizures. The Hiibel case also held that, because Hiibel had no reasonable belief that his name would be used to incriminate him, the name disclosure did not violate the Fifth Amendment right against self-incrimination; however, the Court left open the possibility that Fifth Amendment right might apply in situations where there was a reasonable belief that giving a name could be incriminating. The Court accepted the Nevada supreme court interpretation of the Nevada statute that a detained person could satisfy the Nevada law by simply stating his name. The Court did not rule on whether particular identification cards could be required, though the court did mention a California law requiring "credible and reliable" identification had been struck down for vagueness.

A report is a document that presents information in an organized format for a specific audience and purpose. Although summaries of reports may be delivered orally, complete reports are almost always in the form of written documents.


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