What effect does high static pressure have on the altimeter reading?

High static pressure actually causes the altimeter to read low. The altimeter operates based on the principle of measuring atmospheric pressure. When the static pressure increases, it results in a higher density of air in the atmosphere at a given altitude. The altimeter, which is calibrated to atmospheric pressure, interprets this higher pressure as being at a lower altitude than it truly is.

As the pressure rises, the altimeter's internal mechanisms respond by indicating a lower altitude than the actual flight level since it perceives the higher pressure as 'pulling' the altitude downwards. This is particularly important for pilots to consider, as a low reading on the altimeter could lead to a risk of flying at an altitude that is not safe, potentially leading to terrain clearance issues or accidents.

Other options do not accurately describe the relationship between static pressure and altimeter readings. Thus, understanding the effect of high static pressure is crucial for proper altitude management during flight.