California declares emergency months before Super El Niño could hit hardest

California is preparing for a weather threat that may not fully show itself for months. Gov. Gavin Newsom declared a statewide state of emergency on September 21 as a rapidly strengthening El Niño raises the risk of a particularly wet and disruptive winter. The state says there is now a greater than 90% chance of a very strong El Niño this fall and winter, with a 75% chance it reaches historic strength.

So when could California feel the worst of it?

There is no date for a single major storm, but forecasts provide a clearer window. Southern California could begin seeing wetter conditions as early as November and December, while the strongest statewide signal for above-normal precipitation currently falls between January and March 2027. Some seasonal models extend the wetter pattern from December through April.

That does not mean California will be hit by one enormous storm in January. El Niño changes large-scale atmospheric patterns and can steer repeated Pacific storms toward the state. Forecasters cannot tell this far in advance exactly when an individual storm will arrive or how powerful it will be. Seasonal forecasts show increased probabilities, not guarantees.

Why California is declaring an emergency now

The unusually early declaration is designed to buy the state time. Newsom’s order allows agencies to stage sandbags, pumps, road-closure equipment and snow-removal equipment, while preparing the California National Guard for potential flood response, rescues and logistical support. Officials are particularly concerned about flooding, landslides, debris flows, strong winds, large waves and coastal flooding if powerful storms develop.

January through March could be the key window

For residents, that makes the calendar important. November and December could provide the first taste, but January through March is currently the period to watch most closely. California’s emergency declaration does not mean disaster is certain; it means officials see enough risk in the developing El Niño to prepare before the most consequential part of winter arrives.

SEO description: California has declared a statewide emergency months before El Niño could hit hardest. Forecasts now point to a key winter window when rain and flooding risks could intensify.