This species is a rare but regular late autumn migrant and winter visitor to the coast of California. The pale crown, throat and chest are consistent with the expected northern race T. m. satrapa ranging from Arizona to northern South America. T. m. occidentalis is a synonym.
Digiscoped with Panasonic DMC-LX5 | Nikon FieldScope III | 30XWA | hand-held (no adapter).
References:
Jahn, A. E., Philip C. Stouffer and R. Terry Chesser. 2013. Tropical Kingbird (Tyrannus melancholicus), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, editor). Cornell Lab of Ornithology, Ithaca, New York, USA. https://doi.org/10.2173/nb.trokin.01
Stouffer, Philip C. and R. Terry Chesser.(1998).Tropical Kingbird (Tyrannus melancholicus), The Birds of North America (P. G. Rodewald, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America: https://birdsna.org/Species-Account/bna/species/trokin