Climate The prevalent long term weather conditions in a particular area. Clear slot A local region of clearing skies or reduced cloud cover, indicating an intrusion of drier air often seen as a bright area with higher cloud bases on the west or southwest side of a wall cloud. In the United Kingdom, clear is defined as “No cloud”, and in Australia, it is defined as “Virtually cloud-free”.
Clear Sky condition of less than 1/10 cloud coverage. Cirrus cloud High cloud, delicate, hair-like and feathery looking. Chinook A Chinook is a warm, dry, gusty wind that occasionally occurs to the leeward side of a mountain range, particularly the Rocky Mountains. Celsius A temperature scale in which zero is the freezing point of water and one hundred is the boiling point. Top Calm The absence of apparent motion in the air. Broken clouds Clouds which cover between 5/8ths and 7/8ths of the sky. Brisk Wind in the range of 15 to 25 miles per hour when the temperature is cold. Breezy Wind in the range of 15 miles per hour to 25 mile per hour with mild or warm temperatures.
Blustery Descriptive term for gusty winds that accompany cold weather. Blowing spray Water droplets torn by the wind from a body of water, generally from the crests of waves, and carried up into the air in such quantities that they reduce the reported horizontal visibility to less than seven statute miles. In Canada, it is described as snow that is lifted by the wind from the earth's surface to a height of two meters or more. Blowing snow may be snow that is falling and/or loose snow on the ground picked up by the wind. Blowing snow Wind driven snow that reduces visibility to six miles or less causing significant drifting. Blowing sand Sand particles picked up from the surface of the earth by the wind to moderate heights above the ground, reducing the reported horizontal visibility to less than seven statute miles. Visibilities of 1/8 mile or less over a widespread area are criteria for a Blowing Dust Advisory. Blowing Dust Dust that is raised by the wind to moderate heights above the ground to a degree that horizontal visibility decreases to less than seven miles. It blocks the movement eastward movement of low pressure areas (cyclones) at its latitude. Blocking high A high pressure area (anticyclone), often aloft, that remains nearly stationary or moves slowly compared to west-to-east motion. In Australia, it is described as a violent and very cold wind which is loaded with snow, some of which has been raised from snow covered ground. In Canada, a blizzard described as a severe storm that lasts three or more hours, and brings low temperatures, strong winds and poor visibility due to blowing snow. Extremely cold temperatures often are associated with dangerous blizzard conditions. Blizzard Includes winter storm conditions of sustained winds or frequent gusts of 35 mph or more that cause major blowing and drifting of snow, reducing visibility to less than one-quarter mile for 3 or more hours.
Black ice Thin, new ice that forms on fresh water or dew covered surfaces it is common on roadways during the fall and early winter and appears "black" because of its transparency. Bitterly cold In winter, bitterly cold or very cold, refers to more than seven degrees Celsius below normal. Barometric pressure The actual pressure value indicated by a pressure sensor. Barometer An instrument for measuring atmospheric pressure. The structure typically is most pronounced on the leading edge of the updraft, while drier air from the rear flank downdraft often erodes the clouds on the trailing side of the updraft. Barber pole A thunderstorm updraft with a visual appearance including cloud striations that are curved in a manner similar to the stripes of a barber pole. Top Ball lightning A relatively rarely seen form of lightning, generally consisting of an orange or reddish ball of the order of a few cm to 30cm in diameter and of moderate luminosity, which may move up to 1 m/s horizontally with a lifetime of a second or two. Business Date to Date (exclude holidays).
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