Dusk definition precipitation definition3/11/2024 A cloud forms in the atmosphere as a result of condensation of water vapour. CloudĪ visible collection of minute particle matter, such as water droplets and/or ice crystals, in the air. Snow on the ground: For "today" is based on "today's" morning (AM) observation.įor sites reporting only once per day, the calendar day rather than climatological day applies.Ī time that best suits the observer for regular observations should be determined and maintained every day. Rainfall, snowfall and precipitation totals: For "today" are calculated from "today's" afternoon (PM) observation with "tomorrow's" morning (AM) observation and Minimum temperature: For "today" is calculated from the minimum temperature reported for "today's" morning (AM) observation and for "today's" afternoon (PM) observation Maximum temperature: For "today" is calculated from the maximum temperature reported for "today's" afternoon (PM) observation compared to the maximum temperature reported for "tomorrow's" morning (AM) observation For example, the climatological day begins at the 0601 UTC observations on Day 1 and ends at the 0600 UTC observation on Day 2.įor sites that report two observations over a 24-hour period, MSC uses the following procedure to determine: The climatological day tends to start and end at the same hour of two consecutive days. A climatological day was therefore developed to ensure that the maximum and minimum temperatures could be captured. Normally, the coldest period in any given day is just before sunrise and the warmest period in a day is shortly after the sun reaches its zenith in the afternoon. Observations taken based on a calendar day cannot capture the minimums and maximums that are truly reflective of the peaks and lows over a 24-hour period. When observations are discontinued at a site, the number is not used for subsequent stations (which may, or may not, differ in name) unless it is judged that the records from the earlier and subsequent stations may be combined for most climatological purposes. The first digit assigned identifies the province where the second and third digits identify the climatological district within the province. The climate ID is a 7 digit number assigned by the Meteorological Service of Canada to a site where official weather observations are taken, and serves as a permanent, unique identifier. It differs from weather, which is concerned with short term or instantaneous variations in the state of the atmosphere at a specific time. Climatology, or the study of climate, includes climatic data, the analysis of the causes of the differences in climate, and the application of climatic data to the solution of specific design or operational problems. Statistics are generally drawn over several decades. The historical record and description of average daily and in seasonal weather events that help describe a region. To convert from degrees Celsius to degrees Fahrenheit, ( C * 9/5) + 32 Climate In 1948, the Ninth General Conference on Weights and Measures replaced "degree centigrade" with "degree Celsius." Commonly used in countries that observe the metric system of measurement. CelsiusĪ temperature scale where water at sea level has a freezing point of 0 ☌ (Celsius) and a boiling point of +100 ☌. Top of Page C CalmĪn absence of wind flow or any other air motion. Snow particles violently stirred up by wind to sufficient heights above the ground to reduce visibility to 10 km or less. Visibility at eye level may be reduced to 1 km. Top of Page B Blowing Dustĭust that is raised by the wind, to moderate heights above the ground. Measurement units for pressure are called hectopascals (hPa). It is equal to the weight of a vertical column of air of a unit area, extending from a given elevation or level to the outer limit of the atmosphere. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Atmospheric Pressure/Barometric PressureĪtmospheric Pressure, also called barometric pressure, is the force per unit area exerted by the atmosphere as a consequence of its weight.
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