- H- Helicity - A property of a moving fluid which represents the potential for helical flow (i.e. flow which follows the pattern of a corkscrew) to evolve. Helicity is proportional to the strength of the flow, the amount of vertical wind shear, and the amount of turning in the flow (i.e. vorticity). Atmospheric helicity is computed from the vertical wind profile in the lower part of the atmosphere (usually from the surface up to 3 km), and is measured relative to storm motion. Higher values of helicity (generally, around 150 m2/s2 or more) favor the development of mid-level rotation (i.e. mesocyclones). Extreme values can exceed 600 m2/s2. Hodograph - A plot representing the vertical distribution of horizontal winds, using polar coordinates. A hodograph is obtained by plotting the end points of the wind vectors at various altitudes, and connecting these points in order of increasing height. Interpretation of a hodograph can help in forecasting the subsequent evolution of thunderstorms (e.g., squall line vs. supercells, splitting vs. non-splitting storms, tornadic vs. nontornadic storms, etc.). Mushroom - [Slang], a thunderstorm with a well-defined anvil rollover, and thus having a visual appearance resembling a mushroom. Hongo – [Construcción vulgar], tormenta con un Yunque Retorcido bien definido, y así teniendo una apariencia visual similar a la de un hongo o seta. Humidity - Generally, a measure of the water vapor content of the air. Popularly, it is used synonymously with relative humidity. Relative Humidity - A dimensionless ratio, expressed in percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature. As such, relative humidity by itself does not directly indicate the actual amount of atmospheric moisture present. See dew point. Humedad Relativa - Proporción sin dimensiones, expresado en tanto por ciento, de la cantidad de humedad atmosférica presente en relación con la cantidad que estaría presente si el aire estuviera saturado. Puesto que esta cantidad es dependiente de la temperatura, la humedad relativa es función del contenido de humedad y de la temperatura. Entonces, la humedad relativa en sí misma no indica directamente la cantidad actual de humedad atmosférica presente. Ver punto de rocío.
|
© Spain Severe Weather 2010
Colaboran: Diseño web y publicidad :: Meteored.com