(Refer to the provided figure.) A remote pilot plans a small UAS operation in an area shown on the 24 HR forecast with the symbol for ceiling less than 1,000 feet and/or visibility less than 3 miles. This condition will primarily affect UAS performance by

A remote pilot is planning a small unmanned aircraft (sUA) inspection flight over a construction site with cranes extending to 250 feet above ground level (AGL). The current METAR reports a ceiling of 800 feet AGL and visibility of 1.5 statute miles. The flight is planned at 350 feet AGL to clear the cranes. What is the MOST CRITICAL safety risk posed by the ceiling and visibility?

Ceiling and visibility conditions affect small unmanned aircraft (sUA) operations primarily by