As Maya reprogrammed the FMS, she asked, “Captain, what made you pull the trigger?”
ATPL Meteorology Question 3: In the Northern Hemisphere, where is the area of most significant divergence aloft relative to a jet streak? meteorology atpl questions
“Standard lapse rate is 1.98°C per 1,000 feet, but this airmass is stable—temperature drops about 2°C per thousand. From +2°C to 0°C is a 2°C drop. So the freezing level is at 1,000 feet AGL,” Maya calculated. “But the cloud base is 200 feet. The entire layer from 200 to 1,000 is below freezing but above the surface. That’s the sweet spot for severe icing.” As Maya reprogrammed the FMS, she asked, “Captain,
Jim keyed the intercom. “Rome Control, Speedbird 242. We are diverting to Naples. Request lower level, direct routing.” So the freezing level is at 1,000 feet
After landing, they pulled up the latest METAR for Rome: LIRF 201650Z 22025G38KT 0100 FZFG VV001 M00/M00 Q1009 NOSIG.