The strong thunderstorms pose risks of localized flooding, downed tree limbs, and unsecured objects being blown around. Residents in Santa Clarita, the Grapevine area, and nearby locations should be cautious of hazardous road conditions caused by heavy rain. The NWS also highlights the risk of lightning strikes, which can occur even after the storm has passed. Lightning is a significant hazard, with approximately 25 million strikes occurring annually in the U.S., causing about 20 fatalities each year.