Past Week’s Weather
A rather unsettled start with cloud and outbreaks of rain during Monday. High pressure began to build from the south during Tuesday, but it remained unsettled and breezy in northern parts. By Friday high pressure dominated bringing clear and sunny weather across most parts. It was rather cold though with lows of minus 4 at Brize Norton.
It has been a good weather week for the
Fairly cloudy starts to most mornings, but the afternoons have been bright with plenty of sunshine and only a few showers, mainly overnight.
Large amounts of cloud around at times, with a few showers. Generally the afternoon periods were brighter with sunshine.
How are clouds formed? Compiled by Mr
Clouds are formed when invisible water vapour in the air changes into visible water droplets or ice crystals. For this to happen the air must become saturated (when the air is unable to hold all the water in vapour form). It then begins to condense into liquid/solid form. There are two ways to start this process:
1. Increase the water content in the air to the point where the air can hold no more.
As the sun heats the ground, it causes the air near the surface to become warmer. As the air parcel is warmer than it’s surrounding air it begins to rise. As it rises the parcel of air cools to the point where it becomes saturated and the molecules condense to form clouds.
The cloud droplets need something to condense on. Floating in the air are millions of salt, dust and smoke particles known as Cloud Condensation Nuclei which enable the condensation process to take place.