Air pressure is measured in hectopascals.  Regions of sinking air are called high pressure regions.  Clear skies and fair weather usually occur in these regions.  Regions of rising air are called low [..]

Is an instrument used to measure wind speed.

An instrument used to measure atmospheric pressure.

A number system estimating and reporting wind speeds.  It is based on the Beaufort Force or Number, which is composed of the wind speed, a descriptive term, and the visible effects upon land objects.  [..]

A severe weather condition characterised by low temperatures, strong winds, falling snow and reduced visibility.

A severe snowstorm with high winds and low visibility.

An atmospheric condition that lacks wind or any other air motion.

The state of the sky when no clouds are observed.

A visible collection of minute particle matter, such as water droplets and/or ice crystals, in the air.  A cloud forms in the atmosphere as a result of condensation of water vapour.

A condition marked by a low temperature.