What barometric pressure condition will prevent flight operations contrary to published NOTAM requirements?

The condition that will prevent flight operations contrary to published NOTAM (Notice to Airmen) requirements involves certain thresholds of barometric pressure where operational limitations are set. In this scenario, a barometric pressure reading above 31.00 inches of mercury is particularly significant because it represents an unusual atmospheric pressure situation that could lead to various safety and operational concerns for flight crews.

Flying under such high pressure can impact altitude readings and aircraft performance, leading to potential discrepancies between actual altitude and what pilots are perceiving or expecting based on their altimeters if not correctly calibrated. Flight operations during these conditions may be restricted to ensure safety and compliance with aviation regulations. Hence, being aware of these thresholds and their implications is vital for responsible flight planning and operations.

The other pressure options reflect less critical atmospheric conditions where operations may still proceed with appropriate caution or do not trigger the same level of restrictions, thus illustrating why pressures at these other values are not as impactful regarding NOTAM requirements. Understanding and adhering to these pressure thresholds is essential for maintaining safe flight operations in varied atmospheric conditions.