(SFGATE) - New computer models suggest that the current El Niño formation brewing in the Pacific could become the strongest in recorded history.

The broad swath of warmer-than-usual seawater is spreading and deepening. The two largest concentrations are off the coast of Peru, where water is 4 degrees Centigrade warmer than usual, and just west of Vancouver and Seattle — 3 degrees warmer.

If this El Niño continues to grow, it could surpass the modern record-setting 1997-98 El Niño event, which inundated the Bay Area and the rest of California for months, causing flooding, mudslides and subsidences, and heavy snowfalls in the Sierra.

The latest data from the National Weather Service's North American Multi-Model Ensemble indicates a greater-than 95 percent chance of a strong El Niño and a greater-than 60 percent chance of the strongest El Niño on record.