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. |
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