I know a barometer measures pressure but what does pressure really do for weather?

Answer 1

High pressure makes the air sink thus
suppressing clouds.

Highest Recorded
Sea Level Pressure 1084 mb 32.01 in

Very Strong High
Pressure Area 1050 mb 31.00 in

Moderate High
Pressure Area 1030 mb 30.42 in

Average Sea
Level Pressure 1013.25 mb 29.92 in

Moderate Low
Pressure Area 995 mb 29.39 in

Very Strong
Low Pressure Area 976 mb 28.82 in

Hurricane Gilbert 888 mb 26.23 in

Typhoon Tip; 870 mb 25.66 in
lowest recorded
sea level pressure

These are the Ranges of Recorded
Atmospheric Pressure.Hope this helped.

Answer 2

High pressure and low pressure give weather. The flow of air from pressure system to another causes wind. That is one thing we get out of it. High pressure has the atoms and particles densely packed, so there is less room for water molecules, so it is less likely to rain with high pressure. The opposite is true with low pressure. The lower the pressure, the more water it can hold, so the more severe. Look at any storm, and that is low pressure. The low pressure systems on the ocean become hurricanes, and the lower the pressure, the stronger the storm, and higher the winds. The systems spin, high one way, and low the other. They affect the temperature too in kind of the same ways they do weather, but that is too complicated for me to give a good explanation here. The spinning pushes moisture, etc around from bodies of water. So even weak systems can make big storms if they are fed by other systems. There is a relationship that to understand, you must spend some time on the Internet.

Answer 3

Barometric pressure of say 30.05 doesn't mean much in and of itself. It's the change in the pressure, the speed of the change and the direction (up or down) that is significant, and indicates a change in weather is coming. A falling barometer is associated with an advancing cold front or storm; a rising barometer indicates the probable return of fair weather.

Answer 4

Just wanting to clear up a few things about meteorologists in the United States. (1) We use millibars. We also use hectopascals. Since they are the same number (500mb = 500hPa) it isn't a big deal what unit you stick on the end, you can always change it for a conversion. (2) We report in inches of mercury so that the public will understand the air pressure. We do not use it outside of reporting it to the public. We use millibars/hectopascals. (3) We only use Fahrenheit for surface temperatures, again, so that the public will understand. All upper air obs are in Celsius, all calculations use either Celsius or Kelvin. A low pressure is an area where the pressure is lower relative to the surrounding air. This is usually caused by upward motion, mass is being removed from the area. Since the pressure lowers, the air converges (comes together) in the low, resulting in more upward motion. Sometimes the convergence comes first. A high pressure is an area where the pressure is higher relative to the surrounding air. This is usually cause by downward motion, mass is being added to the area. Since the pressure rises, the air diverges (moves away from) in the high, resulting in more downward motion. Sometimes the divergence comes first.

Answer 5

High pressure keeps rain and cooler air out...when the barometer falls usually so does the rain...

Answer 6

the high and low pressure systems govern what weather you have