Update seasonal scores from sounding data, document commercial link patterns
Soundings (10,935): October has strongest gradients (-350 N/km) and
65.7% ducting, raised seasonal score 82→88. February ducting (20.2%)
exceeds January (14.8%), raised 32→40.
Commercial links (12,068 samples): 68 GHz shows 3.9 dB diurnal swing,
11 GHz shows 1.7 dB with inverted multipath pattern, 24 GHz remarkably
stable at 0.9 dB. Diurnal sensitivity is non-monotonic with frequency.
RAOB gradients avg -265 N/km vs HRRR -107 (2.5x stronger) — confirms
HRRR misses thin surface ducts that soundings resolve.
Graham McIntire
2eefe64c9b