High Pressure vs Low Pressure with temperature?

Question

I'm sort of confused--In chemistry, pressure and temperature have a direct relationship--the higher temperature, the higher the pressure, so the lower the temperature, the lower the pressure.

Is this the case in weather/meteorology? When they say on the news that there is a low pressure area, does that mean that there is colder weather and vice versa?

Answer 1

Unlike chemistry there is no black and white answer for weather/meteorology.  In weather high pressure is a downward movment of air, and low pressure is an upward movement.  Sometimes temperature will have an effect on the pressure, sometimes it doesn't.  Take dessert locations, normally in the summer they will have low pressure during the day, this is called a thermal low and it is caused because the heated air begins to rise, but there is no bad weather associated with it.  Where as in cold climates such as the interior of Alaska during the winter you get high pressure due to the extreme cold dense air.

Normally on the news when they mention low pressure that means that you have a trough, or a frontal system coming towards you, but that does not alway mean colder weather, because you have cold fronts, warm fronts and occluded fronts.  The first two are pretty self explanatory, but an occluded front could either be warmer or colder, or you may see some warming followed by cooling.

Answer 2

Not really.  You can have a very cold high pressure, and a very warm and humid low pressure.  Usually low pressure means rain, so the temperature is obviously a little lower because of the cloud cover, but the high pressure and low pressure really don't have much relation with temperature.  

It also depends on the time of year too.  High pressure usually brings cold weather in the winter and warmer weather with low pressure, and vice versa in the summer.

Answer 3

Well a cold and high pressure system really don't have a direct relationship with temperatures. They can form at any temperature, whether it is a hundred degrees or ten below zero.

A lot pressure system will tend to be cooler than a high pressure system since low pressure brings cloudy and rainy weather, and since that doesn't allow for that much sunshine, you will have lower temperatures. But, there can be rain from a low pressure system while it is 90 degrees outside.

A high pressure system usually will be a little warmer compared to a low pressure system since they bring sunny weather, so that allows for the air temperature to be hotter compared to a low pressure system. But, just like a high pressure system, you can have one when its 100 degrees or ten below zero.

And as for the high and low pressure, it is determined by weather conditions and what the reading is on a barometer.

Answer 4

PV=RT is the universal gas equation where 'P' indcates pressure,'V' the volume,'R' is a constant and ' T ' indicates (absolute)temperature.As per this equation,pressure is directly dependenent upon the temperature provided the value'V' is constant.But, in the atmosphere ,when temperature varies,the volume also varies(as you cannot control the volume).So, as the temperature increases, the pressure may sometimes decrease depending upon the increase in volume.This is what usually happens in the atmosphere.Sea breeze(or monsoons) is an example.When the land is heated more than the adjacent sea surface,the air over land becomes light and ascends creating a small low pressure area over the surface.The cool air from the comparatively high pressure area over the sea,rushes towards the land to replace the ascending warm,moist air constituting the sea breeze.