Which type of weather is usually associated with high air pressure?
Dry weather with clear skies
Cold weather with snow
Hot weather with rain
Stormy weather with clouds
Answers
Answer:If the atmospheric pressure is high, it is because … the air sinks! Due to an uneven heating by the sun, the air rises here and sinks there, pretty much like the bubbles of a boiling pot of water.
When the air sinks, it warms up by the adiabatic effect of a greater pressure under. It is pretty much like your pump getting warm as you inflate the tyres of your bike.
How much moisture the air can contain, depends on its temperature; the warmer, the more it can contain. As sinking air warms up, its moisture evaporate fast. Any cloud then will evaporate and this is why a high pressure is often associated with a clear sky and sunny weather.
Because the subsidence (sinking) of the air is much slower in a high pressure than the convection (rising) in a low pressure, a high one is often with very little wind.
But then, a cloud less sky lets more heat from the sun reaching us during the day, but also, more heat escaping the earth as infra-red, at night. The balance of which is called, the sun’s net radiation or, net flux.
It is always positive (more gain than loss) at the equator and always negative at the poles. In between, it is positive during the summer and negative during the winter.
At mid-latitudes if a high pressure appears in say, June, it will be warmer and warmer for each day it lasts. If in January, it will get colder and colder.
A high pressure can also cause local weather patterns like, a sea breeze along a coast or a katabatic wind at night, in the mountains. Since the surface cools down fast during the night, it may cause radiation fog, early in the morning. Along a coastline it can also cause advection fog due to the difference of temperature between the sea and land.
Explanation: