The classic symptom of plantar fasciitis is heel pain when you take your first steps after getting out of bed or after sitting for a long period of time. You may also have: Stiffness and pain in the morning or after resting that gets better after a few steps but gets worse as the day progresses.
When air masses meet. When a moving cold air mass meets a warm air mass, that is lighter, it tends to wedge below the latter, thus giving origin to a cold front. The warm air is forced upwards and its ascent causes the formation of clouds.
There is a thermal boundary layer surrounding the skin which may be several millimetres thick. This boundary layer acts as an insulator. When it is cold and the wind is blowing, the air feels colder than it does when it is calm because the wind blows away the boundary layer. In a perfect calm, if free convection could be suppressed (as it is in microgravity), the boundary layer would be infinitely thick.