On the same day as the Camp Fire, ignitions on the Santa Susanna Field Laboratory site spread rapidly under strong Santa Ana winds to the south to the Ventura Freeway during this period, which it later crossed overnight, into the Santa Monica Mountains. This simulation shows a river of strong winds coming off the Santa Susanna Mountains to the northeast, generating pulses of winds particularly over the mountainous bridge connecting them to the Santa Monica Mountains. The fast spread and weaker heat flux reflects the fast-running fires of sparsely vegetated chaparral-covered terrain.