PRESSURE CHANGE The net difference between the barometric pressure at the beginning and ending of a specified interval of time, usually the three hour period preceding an observation.
Pressure Change- The net difference between pressure readings at the beginning and ending of a specified interval of time.
Pressure changes:(in coastal station reports/3 hours is a 'standard' time period used in synoptic meteorology in mid/high latitudes.)
Steady
Change less than 0.1 mbar in past 3 hours ...
The pressure change over a fixed distance at a fixed altitude. The larger the pressure gradient the stronger the winds.
Prevailing wind
A wind that blows from one direction more frequently than any other during a given period.
- measured the air pressure changes over a week
- understand how an aneroid barometer works.
Capacity correction The correction applied to a mercury barometer with a nonadjustable cistern in order to compensate for the change in level of the cistern as the atmospheric pressure changes.
Pressure Change: The difference between the beginning reading of barometric pressure and the end of a particular time reading.
PRESFR: Pressure Falling Rapidly...When the pressure falls at the rate of 0.06 inch or more per hour.
Thus, the analysis of synoptic charts may consist, for example, of the drawing and the interpretation of the patterns of wind, pressure, pressure change, temperature, humidity, clouds, and hydrometeors, ...
Now we consider the case in which the pressure changes with time, and new winds are created. We are familiar with isobars, the lines p = constant, on the weather map. These curves are drawn from the station pressures also shown on the map.
As a result, air sinks in the northern 'quadrant', and rises in the southern quadrant, leading to pressure changes at the surface.
Pressure Gradient-The amount of pressure change occurring over a given distance.
Radiosonde-A lightweight package of weather instruments fitted with a radio transmitter and carried up into the atmosphere by a balloon.
ISALLOBAR- A line of equal surface pressure change.
ISENTROPIC LIFT / DESCENT- Lifting or sinking of air along constant potential temperature (theta) surfaces.
Isallobars - lines of equal pressure change over a set period of time.
Isocold - a line you utter when you want to go inside.
Jet stream - fast moving, high elevation stream of wind.
MICROBAROGRAPH: An aneroid barograph designed to record atmospheric pressure changes of very small magnitude.
MILLIBAR: A unit of pressure equal to 100 Pascals.The Pascal (Newton/meterē ) is the S.I. unit for pressure.
ALTIMETER - An instrument which indicates your flight altitude by sensing air pressure changes and displaying it in feet.
ANABATIC WIND - A current of air which flows up a slope due to heating from the surface.
Air pressure tendency Change in air pressure with time; on a surface weather map, the air pressure change over the prior 3 hours.
Albedo The fraction or percent of radiation striking a surface that is reflected by that surface.
Pressure tendency (barometric tendency) The character and amount of atmospheric pressure change for a three-hour or other specified period ending at the time of observation.
The sensor has electrical properties (resistance or capacitance) that change when the atmospheric pressure changes. Electronic circuitry connected to the sensor then converts its output into a visual display.
condensation: when a vapor becomes a liquid due to some change. Occurs often when the temperature becomes cooler, the humidity becomes greater, or the air pressure changes.
The adiabatic lapse rate (or dry adiabatic lapse rate) is the normal rate of change (9.8°C/km) for a dry parcel of air that is moved up or down and cools or warms as the pressure changes.
WILSON CLOUD - A condensation cloud where invisible water vapor in the air condenses into a suspension tiny droplets of liquid water. Most commonly referred to the condensation cloud around an explosion or regions where air pressure changes causing ...
 See also: Pressure, Atmosphere, Surface, Wind, Temperature
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