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  • Vertical distance between the surface of a snow layer and the ground, the layer being assumed to be evenly spread over the ground which it covers.

  • The temperature measured at a given depth. Typically -10 cm.

  • The total of direct solar radiation and diffuse sky radiation received by a horizontal surface of unit area.

  • The pressure exerted by the earth's atmosphere at any given point, being the product of the mass of the atmospheric column of the unit area above the given point and of the gravitational acceleration at the given point. A value of standard or normal atmospheric pressure, equivalent to the pressure exerted by a column of mercury 29.92 inches (760 mm) high, or 1013 millibars (101.3 kilopascals).

  • Elevation, at a certain location and time, of the water table or piezometric surface of an aquifer.

  • The temperature of the atmosphere which represents the average kinetic energy of the molecular motion in a small region and is defined in terms of a standard or calibrated thermometer in thermal equilibrium with the air.

  • Due to the prolonged drought and the warm and sunny weather, we advise all citizens to reserve the use of drinking water, as far as possible, to essential uses such as food preparation and hygiene.

  • (1) Liquid or solid products of the condensation of water vapour falling from clouds or deposited from air on the ground. (2) Amount of precipitation (as defined under (1) ) on a unit of horizontal surface per unit time.