What does the remark PRESRR indicate in a METAR report?

The remark PRESRR in a METAR report signifies that the atmospheric pressure is rising rapidly. This term is a shorthand used in aviation meteorology to indicate a significant change in pressure within a short time frame. A rapid increase in pressure often correlates with improving weather conditions and the potential for clearer skies.

Understanding pressure trends is vital for pilots and meteorologists to make informed decisions about flight safety and weather conditions. A rising pressure indicates that a high-pressure system is dominating the area, leading to more stable weather patterns. This is particularly relevant for flight planning and operations, as well as for anticipating any changes in weather that could affect flight conditions.

The other options do not accurately reflect the meaning of PRESRR; they either suggest no change or a decrease in pressure, which does not align with the rapid rise indicated by this remark.