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Glider pilots in the Midwest know that thermal updrafts
Chapter 17, Problem 25DQ(choose chapter or problem)
Glider pilots in the Midwest know that thermal updrafts are likely to occur in the vicinity of freshly plowed fields. Why?
Questions & Answers
QUESTION:
Glider pilots in the Midwest know that thermal updrafts are likely to occur in the vicinity of freshly plowed fields. Why?
ANSWER:Solution 25DQ Step 1: Dense,broken or overcast middle and high cloudiness shade the surface cutting off surface heating and convective thermals.on a generally warm bright day but with patchy middle or high cloudiness,cumulus may develop,but the thermals are few and weak. The high-level cloudiness may drift by in patches.thermals surge and wane as the cloudiness decreases and increases.never anticipate optimum thermal soaring when plugged by these mid and high-level clouds. Middle-level convective clouds develop in updrafts at and just below the cloud levels.they do not extend upward from the surface.if a sailplane can reach levels near the cloud bases.the problem is reaching the convective level.