Question: What are the continuous pressure plans?
answer: Fixed pressure schemes such as 500MB chart may look clear for the interpretation. It contains many features similar to what you may see on the surface analysis scheme. There H’s and L’S represent altitudes and decline, and there are ISOBARS similar lines.
However, those H and L’S do not celebrate the position of high and low pressure centers, and the lines are not continuous pressure lines or ISOBARS. Why is this different from the surface analysis scheme?
The surface analysis scheme, such as the appearance below, shows the pressure recorded by the barometer standards on the surface. However, if we strictly draw the surface pressure from these notes for pressure, it will look like a surface dilution map or topographic map. That is, the high terrain is generally lower pressure.
Therefore, you can simply draw the difference in pressure due to the high terrain and not due to the relative differences in the field of pressure.
Consequently, meteorology experts, with the surface pressure, to a height that we know as average sealed sea level as MSL. This depicts surface pressure as if there were no topography features or less than sea level.
In other words, the surface analysis scheme depicts how the pressure changes while keeping fixed with height. This is officially described as a photo pressure at a steady geographical altitude of zero.
The fixed pressure scheme is that it is a striped where the pressure is fixed. Unlike the surface analysis scheme, the pressure is not different. What differs from this scheme is to rise From the specific pressure surface. For example, and solid Imagine the lines on the fixed pressure scheme below, a 500MB surface height.
So why do you use constant pressure instead of the “constant height” to photograph the weather high? It may seem easier to photograph how pressure ranges at 10,000 feet instead of how height is different at 700MB. Well, partial blame for flying.
Over the 1960s, meteorologists have drawn weather maps describing upper air conditions using fixed pressure surfaces. These charts are prepared twice a day at 0000Z and 1200Z for several mandatory pressure levels (925MB, 850MB, 700MB, etc.) of temperature, humidity and winds provided by the Radiosonde operational network (weather balloons), completed with data from other sources such as planes and the Suz Al -Qoues.
Meteorologists use these ongoing pressure plans instead of the steady high plans for several reasons:
- Since most of the aircraft used by time pressure measuring devices are used, most “constant height” flights have already been transferred to fixed pressure surfaces. Today, the aircraft still fly fixed pressure surfaces at altitudes at or above 18,000 feet (also known as high transition). This is done using a fixed height scale setting of 29.92. As pressure change during the road, the pilot does not adjust the setup of the height scale. Instead, they adjust their real height up or down to transfer a fixed pressure surface.
- The measuring data is reported from the radio -dimension that is prepared in terms of pressure in terms of pressure. With the climb of the balloon, the temperature and the relative humidity and the wind are measured and reported as a function of pressure, not the height.
- The use of pressure as vertical coordinates simplifies many thermal dynamic equations and accounts used in the prediction models of numerical weather. In other words, when you keep fixed pressure, these equations make the solution to these equations easier. This was very important when the computing power was not as good as it was today. Therefore, in addition to the schemes made of Radiosonde data, prediction data is also photographed on fixed pressure schemes.
Meanwhile, we are stuck using these charts because most of the predictors have adapted to them over the years. In addition to the high pressure surface, you will also imagine many fixed pressure schemes available online also the actual or expected wind speed. Therefore, many pilots examine these plans for the winds high.
AWC provides winds on fixed pressure surfaces without width of the height features as shown above. Although the graph holds a mark on the specified Mediterranean level (for example, 18,000 feet MSL), please know that this is just rounding. This is still a fixed pressure scheme.
As a result, the real height of wind can vary by 2000 feet or more. It is better to use this AWC delivery to a plane that flying at an altitude of 18,000 feet and higher because it really flying a fixed pressure surface.