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ALT Infographic titled "What is El Niño?" dated September 24, 2026, from NWS Sacramento. The main text explains that El Niño is the warm phase of the ENSO climate pattern in the tropical Pacific Ocean. A global sea surface temperature anomaly map shows dark red and orange warm anomalies along the equator in the highlighted "Niño 3.4 Region." Text indicates El Niño occurs when this anomaly exceeds a 3-month average of +0.5°C for 5 consecutive monthly periods.
ALT Infographic titled "El Niño Status & Outlook" from NWS Sacramento. An active El Niño Advisory indicates "No Clear Indicator" for Northern CA winter precipitation and "Warmer than Normal" temperatures. Highlights state El Niño is present, with a 98% chance of a very strong event and 75% chance of a historic event relative to data since 1950. A callout starburst emphasizes: "Record Strength does not guarantee Record Impacts."
ALT Infographic titled "What We Know & What We Don't Know" from NWS Sacramento. "What We Know" highlights a 75% chance of a record event, mixed historical precipitation results for NorCal, increased Delta/coastal flood risks from higher sea levels, and reservoirs starting in good shape. "What We Don't Know" highlights specific storm counts, individual storm strengths, exact rain/snow totals, and localized flooding, noting these details only become clear 1 to 2 weeks out.
ALT Infographic titled "El Niño Shifting Actions Timeline" from NWS Sacramento showing four preparedness phases: 1) Seasonal Outlooks (KNOW weather risks and insurance policies); 2) Monthly Outlooks (PREPARE home, clear drains/gutters, check sandbags); 3) Weekly Outlooks (REVIEW emergency supply kits and family plan); 4) Weather Outlooks (ACT by securing outdoor items or preparing for evacuation).
ALT Cool temperatures today and tomorrow will give way to an abrupt warm-up Wednesday with above average temperatures and a return of muggy coastal conditions through Sunday. Highs peak Wednesday in the Inland Empire, reaching the mid-to-upper 90s, then peak Fri/Sat for areas closer to the coast (mid-80s to low-90s).
ALT Key Messages: 1. Heavy rainfall associated with Polo will impact coastal portions of southwest Mexico through Thursday. This rainfall may produce life-threatening flooding and mudslides, especially in areas of steep terrain. 2. Polo is forecast to strengthen to a major hurricane while it moves closer to the coast of southwestern Mexico during the next few days. Although the core of the hurricane is forecast to stay offshore, it is too soon to determine the exact location or magnitude of impacts. Residents in southwestern Mexico should closely monitor its progress and updates to the forecast. A Tropical Storm Watch is in effect for portions of southwestern Mexico.
ALT Mensajes clave: 1. Las fuertes lluvias asociadas con Polo afectarán las porciones costeras del suroeste de México hasta el jueves. Esta lluvia puede producir inundaciones y deslizamientos de tierra que amenazan la vida, especialmente en áreas de terreno empinado. 2. Se pronostica que Polo se fortalezca hasta convertirse en un huracán mayor a medida que se acerca a la costa del suroeste de México durante los próximos días. Aunque se pronostica que el núcleo del huracán permanecerá en alta mar, es demasiado pronto para determinar la ubicación exacta o la magnitud de los impactos. Los residentes en el suroeste de México deben monitorear de cerca su progreso y las actualizaciones del pronóstico. Una Vigilancia de Tormenta Tropical está en efecto para porciones del suroeste de México.
