![]() High pressure with a number such as 25 means 1025 mb.Ī low pressure center which refers to a migratory frontal cyclone of center and higher latitudes. Low pressure with a number such as 99 means 999 mb and with 03 means 1003 mb. Low & High Pressure Systems and Miscellaneous Key Terms Ahead of a typical warm front in the northern hemisphere, winds are from the southeast and behind the front winds will shift to the southwest. The gradients of temperature and moisture are maximized in the frontal zone. The leading edge of a relatively warmer surface air mass which separates two distinctly different air masses. These processes lead to the dissipation of the front in which there is no gradient in temperature and moisture.Īn elongated area of relatively high pressure that is typically associated with a anti-cyclonic wind shift.Ī front that has not moved appreciably from its previous analyzed position.Īn elongated area of relatively low pressure that is typically associated with a cyclonic wind shift. When a warm front overtakes a cold front or quasi-stationary front the process is termed a warm front occlusion. The union of two fronts, formed as a cold front overtakes a warm front or quasi-stationary front refers to a cold front occlusion. The weakening or dissipation of a front occurs when two adjacent air masses lose contrasting properties such as the density and temperature. It occurs most frequently over continental land areas such as over the Eastern US when the air mass moves out over the ocean. The formation of a front occurs when two adjacent air masses with different densities and temperatures meet and strengthen the discontinuity between the air masses. In the northern hemisphere winds ahead of the front will be southwest and shift into the northwest with frontal passage. The leading edge of a relatively colder air mass which separates two air masses in which the gradients of temperature and moisture are maximized. Q-STNRY = Quasi-Stationary or Near Stationary Precipitation in the form of balls or irregular lumps of ice, usually produced by convective (cumuliform) clouds.(click to enlarge image) Standard Text Abbreviations One or more convective (cumuliform) clouds in which electrical discharge can be seen as lightning and heard as thunder. Strong or gale force winds accompanied by rainfall. In these cases the wind icon is used to highlight that. Occasionally the wind speed is the most important aspect of the weather. A “snow flurry” is a concise term describing a light snow shower where the snow does not stay/accumulate on the ground. The distinction between "snow" and “snow showers” is similar to the distinction between "rain" and "showers". Precipitation composed of white or translucent ice crystals. Suspension of very small water droplets in the air, reducing visibility at ground level to less than a kilometre. Liquid water drops greater than 0.5 mm in diameter.Ĭonsists of very small water droplets (less than 0.5 mm in diameter) very close to one another In contrast to showers, rain is steadier and normally comes with cloudy or overcast skies. Often, but not always, separated by blue sky. Relatively short-lived, but may last half an hour. Not many, relatively short-lived periods of precipitation. Cloud expected to cover approximately 70 to 100% of the sky for the majority of the day. When the sky is partly covered by cloud at any given location. Weather in which the sun casts a shadow for most of the time or night skies are relatively cloud free.
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