what is the difference between true wind and apparent wind?
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Apparent wind differs in speed and direction from the true wind that is experienced by a stationary observer and composed of the true wind speed (TWS) and true wind direction (TWD) or the TWS and true wind angle (TWA) relative to the boat if it were stationary.
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Upper-air winds are faster than surface winds because friction is greatly reduced aloft. Friction slows surface winds, which in turn reduces the Coriolis effect. The result is air movement at an angle across the isobars toward the area of lower pressure.
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If you read it, it's true. If you hear it, it's magnetic. All charts and textual sources (METAR, TAF, winds aloft, surface analysis charts, etc) use true north as the reference. ATIS/AWOS/ASOS broadcasts, or any information a controller gives you over the radio, is magnetic.
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Yes, wind can travel faster than the speed of sound. Wind is just the bulk movement of a mass of air through space and is in principle no different from a train speeding along or a comet zipping through space.
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The wind vane is another weather instrument. This instrument is used to measure the direction of the wind.
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The key difference between natural and forced convection is that in natural convection, the motion of the fluid is influenced by natural means whereas, in forced convection, the motion of fluids is influenced by external means.
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A land breeze is a breeze blowing from land out toward a body of water. A sea breeze is a wind blowing from the water onto the land. Land breezes and sea breezes arise because of differential heating between land and water surfaces.
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TWA = True Wind Angle - angle of the boat to the wind. SOG = Speed over Ground - includes current forecast. COG = Course over Ground to the next waypoint.
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METAR winds are always given relative to true north. AWOS and ASOS winds transmitted locally by radio (such as at an airport) are in magnetic direction (so they will be useful to pilots landing on runways aligned to magnetic north) but are given in true direction when used as part of the METAR format.
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The key difference is due to the property of water to retain heat and warm up longer as compared to land. Land breezes are also known as off-shore winds while sea breezes are also called on-shore winds. While a land breeze is formed at night, a sea breeze is formed at daytime.
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On the surface, wind moves away from high pressure (High) and toward low pressure (Low). Convergence occurs near the equator (winds blow in towards one another) and Divergence occurs under the descending air that forms high-pressure belts.
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Apparent temperature is the temperature equivalent perceived by humans, caused by the combined effects of air temperature, relative humidity and wind speed. ... The wet-bulb globe temperature (WBGT) combines the effects of radiation, humidity, temperature and wind speed on the perception of temperature.
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REVIEW: The power dissipated by a load is referred to as true power. ... Total power in an AC circuit, both dissipated and absorbed/returned is referred to as apparent power. Apparent power is symbolized by the letter S and is measured in the unit of Volt-Amps (VA).
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Wind direction is measured relative to true north (not magnetic north) and is reported from where the wind is blowing. An easterly wind blows from the east or 90 degrees, a southerly from the south or 180 degrees and a westerly from the west or 270 degrees.
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The greater the difference in pressure, the faster the winds. When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure. When a high- and a low-pressure air mass are close together, air moves slowly from high to low pressure.
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Upwind is the direction the wind is coming from. If the wind is blowing from the Northwest (blowing toward the Southeast) then the upwind direction is toward the Northwest and the downwind direction is toward the Southeast.
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Analogous to the solar wind many stars have stellar winds. Because stars are so distant, stellar winds that are as gentle as the solar wind do not produce dramatic effects as seen from the earth. The stellar winds that we observe are therefore much stronger than the solar wind.