Key keywords: Central California tornado warning 2024, National Weather Service Fresno, San Joaquin Valley severe weather, EF0 tornado Merced County, rare West Coast tornado, Central California extreme weather, rotating supercell storm Central Valley On Wednesday afternoon, the National Weather Service (NWS) Fresno office issued a rare tornado warning for swathes of Merced and Madera counties in Central California, marking only the third tornado warning issued for the inland San Joaquin Valley region in the past 25 years. The warning, active from 2:15 p.m. to 3:00 p.m. Pacific Daylight Time, was triggered after doppler radar detected a rapidly rotating supercell storm developing over the agricultural plains north of Merced, with multiple ground witnesses submitting photos and videos of funnel clouds forming just 500 feet above ground level. Tornadoes are exceptionally rare in Central California, where the semi-arid climate typically lacks the combination of warm, moist low-level air and cold, fast-moving upper atmospheric winds required to form rotating storm systems. Statewide, California records an average of just 11 weak tornadoes per year, most of which touch down in remote rural areas and dissipate within minutes without triggering formal warnings. This event marked the first time the upgraded NWS doppler radar network, installed across the Central Valley in 2023, detected sufficient rotational velocity to issue a formal warning, giving residents nearly 40 minutes of lead time to take shelter. Local emergency management agencies activated mass alert systems within minutes of the NWS announcement, sending push notifications to all mobile devices in the warning zone and announcing shelter-in-place orders over local radio and television stations. Multiple public school districts in Merced and Madera counties initiated lockdown protocols, moving students to interior hallways and windowless classrooms until the warning expired, and the Merced County Fairgrounds was opened as a temporary shelter for unhoused residents and families living in mobile homes, which are particularly vulnerable to high wind damage. Post-storm surveys conducted by NWS staff confirmed a low-level EF0 tornado touched down for approximately 12 minutes near the city of Atwater, with peak wind speeds of 75 mph. The storm caused minor damage to 12 agricultural outbuildings, downed 17 power poles, and damaged more than 30 acres of almond and peach orchards, but no injuries or fatalities were reported as of Thursday morning. Meteorologists note that while rare, this type of severe weather event may become slightly more common in the region as climate change drives increased atmospheric moisture levels and more volatile temperature gradients during spring storm systems.