What causes high or low air pressure?

Answer 1

Low pressure areas form when an airmass warms, either from being over a warm land or ocean surface, or from being warmed by condensation of water vapour in large rain or snow systems. The warming causes the air layer to expand upward, becoming slightly thicker. This expansion then causes air in the upper troposphere to flow away, leaving less mass, and so less weight (pressure) at the surface. The lower pressure air at the surface then causes higher pressure air around it to flow toward lower pressure, but as it does, the rotation of the Earth turns the wind to the right, resulting in the counter-clockwise wind flow around low pressure (in the Northern Hemisphere...it flows in the opposite direction in the Southern Hemisphere). High pressure areas form when an airmass cools over a cool land or ocean surface. The cooling causes the air layer to shrink, becoming slightly thinner. This shrinkage then causes surrounding air in the upper troposphere to fill up the extra space. The added weight of the extra air causes higher pressure at the surface. The higher pressure air at the surface then tries to flow outward toward lower pressure, but as it does, the rotation of the Earth turns the wind to the right, resulting in the clockwise wind flow around the high pressure (in the Northern Hemisphere...it flows in the opposite direction in the Southern Hemisphere).

Answer 2

high pressure has clear skys , examples , no clouds no rain a clear blue sky , as for low pressure its rainy cloudy and bad weather , so high pressures good , low pressure is bad ! hope ihelp'd !

xoxo , nadine ! <3 (:

Answer 3

Pressure in the weather can be caused due to different reasons. like near the oceans it is caused due to rising hot winds. When they become hot they rise up and thus there is a vacuum created in their previous place. This causes low pressure in the area and therefore surrounding cold winds come on that place to fill in the vacuum. Thus this forms the water cycle and here pressure is created due to the temperature of the winds. Otherwise pressure is created due to many layers of air above the surface of the earth.

Answer 4

Yes. Generally a high pressure area is good weather. A low pressure area is usually windy and cloudy, and if the pressure is falling rapidly, you're in for a storm, tornado, or hurricane.

Answer 5

yes.

Example- high pressure, no clouds, sunshine

low pressure, lots of cluds, chance of rain,very high

Answer 6

the passure exerted by air in closed substance or things is called air passure

the high and low air cause by factor affcting altitud by climite of air.

Answer 7

Descending air