Normal barometric pressure is typically around 101.325 kPa / 1013.25 mbar / 760 mmHg / 29/921 inHg. Pressure rarely increases or decreases more than 1 inch of mercury (3.386 kPa / 33.86 mbar / 25mmHg) above or below the 30-inch mark unless the weather conditions are extreme.Know More
The highest ever recorded pressure on Earth was on December 31, 1968, at Agata Lake in Siberia, Russia when the weather conditions were clear and extremely cold at minus 50.8 degrees Fahrenheit. The recorded pressure was 108.38kPa / 1083.8 mbar / 812.92 mmHg / 32.01 inHg.
Many people suffer from migraines and headaches that are associated with rising and falling barometric pressures. Low air pressure means that there is less weight pushing down and the air is rising and cooling, which means that there are clouds forming. High air pressures means that there is more weight pushing down and so the air is sinking, which leads to less humidity and a warmer temperature. Falling barometric pressure is usually associated with either thunder in hot weather, wet weather, windy conditions or some kind of precipitation. Rising barometric pressure is usually associated with fairer weather and typically indicates that there will not be any storms that day. Clear skies are also associated with high barometric pressure.Learn more about Weather Forecasts
The term "trade winds" refers to the regular winds that blow from the subtropical high pressure zones toward the equator in roughly westerly directions. They are so named on account of the way trading ships used these winds when sailing west from Europe to the Americas.Full Answer >
A front is a boundary between air masses that leads to a low pressure system as the atmosphere attempts to even out the temperature contrast. If there is enough moisture in the air, the uplift as these two air masses collide causes rain. If the temperature differential is large enough, the collision leads to thunderstorms, according to NOAA.Full Answer >
The two units of air pressure used in meteorology are low pressure and high pressure. These two units of barometric pressure have a large influence with the weather on Earth.Full Answer >
Barometric pressure was discovered in about 1644 when physicist and inventor Evangelista Torricelli invented the first mercury barometer. Torricelli was an assistant to Galileo Galilei who suggested that Torricelli try using mercury in his vacuum experiments. As Torricelli experimented, he realized the height of the mercury varied from day to day because of changes in atmospheric pressure, thus discovering the principle of the barometer.Full Answer >