What is LMP at a pressure altitude of 3000 ft with a temperature of 20C?

To determine the Local Mean Pressure (LMP) at a pressure altitude of 3000 feet and a temperature of 20°C, we start by understanding that LMP refers to the atmospheric pressure adjusted to a standard reference temperature.

At sea level, the standard atmospheric pressure is defined as 1013.25 millibars (mb), equivalent to 29.92 inches of mercury (inHg) or 760 mmHg. As altitude increases, atmospheric pressure decreases. However, at a specific pressure altitude, the LMP is adjusted to maintain consistency in measurements with standard atmospheric conditions.

In the case of 3000 feet pressure altitude with an actual temperature of 20°C, the pressure can be calculated using the standard lapse rate. For temperatures above the standard (15°C at sea level), the pressure at a higher altitude can be calculated by accounting for the deviation from standard conditions. However, with the given data, we can simply refer to the defined standard pressure, which at sea level is 1013.25 mb.

Since we're assessing pressure altitude, which is a reference based on a standard atmosphere, this value holds valid unless indicated otherwise. Therefore, the correct LMP for this situation would still hold effectively as the standard atmospheric