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Yes, KFMB (760 kHz, San Diego) is licensed for 5 kW non-directional during the day, and 50 kW directional at night. Most of their nighttime power is aimed at the Pacific Ocean.
The null in the nighttime pattern of KFMB protects the nighttime skywave coverage of WJR, Detroit — who is the U.S. “Class A” station licensed for 50 kW on 760 kHz, non-directional 24/7.
Here’s a link to KFMB’s patterns: