Coastal communities from Baja California to Southern California face a sharply elevated hurricane threat this season after NOAA’s Climate Prediction Center assigned a 70% probability that the 2026 eastern Pacific hurricane season will be above normal. The agency projects 15 to 22 named storms, 9 to 14 hurricanes, and 5 to 9 major hurricanes, with accumulated cyclone energy, or ACE, expected to reach 120% to 190% of the long-term median. Unusually warm sea-surface temperatures off Mexico’s Pacific coast are the primary fuel, and an expected El Nino is set to suppress the wind shear that normally limits storm development in this basin.
Why a 70% above-normal probability changes the calculus for 2026
NOAA’s outlook leaves only a 20% chance of a near-normal season and a 10% chance of below-normal activity, according to the agency’s seasonal outlook. That lopsided distribution tells emergency planners along the Mexican and U.S. Pacific coasts that a quiet year is unlikely enough to treat as a planning assumption. The 15-to-22 named-storm range sits well above the 1991 to 2020 average, and the ACE forecast of 120% to 190% of median signals that storms are expected to be not just more frequent but also longer-lived or more intense.
The practical effect is straightforward. Resort towns along Baja California Sur, fishing fleets operating in the Gulf of Tehuantepec, and Southern California communities that occasionally absorb remnant moisture from eastern Pacific hurricanes all face a wider window of risk once the official season opens on June 1. Insurance carriers that write wind and flood policies in these zones price risk partly on NOAA’s seasonal guidance, so a 70% above-normal call can tighten coverage availability before the first storm forms.
Local governments are also under pressure to recalibrate timelines. A season skewed toward higher activity means preparedness campaigns may need to start earlier, evacuation routes must be re-evaluated for capacity, and backup power and water systems should be tested with less tolerance for delay. For smaller coastal municipalities with limited budgets, the odds alone may justify pre-positioning sandbags, temporary pumps, and emergency shelter supplies even if those resources ultimately go unused.
Warm water and El Nino: the twin engines behind the forecast
Two physical drivers dominate the outlook. The first is sea-surface temperature. April 2026 anomaly maps produced from the ERSSTv6 record, which uses the 1991 to 2020 reference period, show positive departures spread across the eastern Pacific’s main development region. Warmer water supplies more heat and moisture to developing tropical systems, raising both the likelihood of genesis and the ceiling for intensification.
The second driver is the state of the El Nino-Southern Oscillation. NOAA’s narrative discussion explicitly ties the above-normal call to the current ENSO state and forecast. In the eastern Pacific, El Nino typically reduces vertical wind shear, the change in wind speed and direction with altitude that can tear apart tropical cyclones before they organize. When shear drops, storms that form over warm water encounter fewer structural obstacles, and more of them reach hurricane strength.
The same El Nino signal is driving a parallel forecast for the central Pacific basin around Hawaii. The NWS Honolulu forecast office separately issued a 70% above-normal probability for the central Pacific season, citing expected El Nino as the key factor. That alignment across two basins reinforces the broader pattern: warm water and favorable atmospheric conditions stretch from the waters off Mexico westward past the Hawaiian Islands.
Model guidance synthesized in NOAA’s graphical outlook slide emphasizes how tightly the 2026 forecast is linked to these ocean-atmosphere anomalies. The depiction of elevated probabilities for both storm counts and ACE across the eastern Pacific underscores that this is not a marginal signal; it is a basin-wide shift toward conditions that historically correlate with more frequent and more intense cyclones.
Testing the upper bound: could ACE exceed NOAA’s own range?
NOAA’s ACE forecast of 120% to 190% of median already implies a season that could produce roughly twice the typical energy output. A reasonable question is whether even that range might prove conservative. If May-through-July SST anomalies in the eastern Pacific remain at or above 1.0 degrees Celsius above average while the Revised Oceanic Nino Index, or RONI, stays in the moderate El Nino range, the combination would sustain an environment favorable for rapid intensification, the process by which storms gain 30 knots or more of wind speed in 24 hours. Rapid intensification events disproportionately inflate ACE because energy accumulates exponentially with wind speed.
NOAA classifies seasons using ACE thresholds and storm-count conditions measured against the 1991–2020 baseline. A season that finishes at 190% of median ACE would already sit at the top of the forecast interval. Sustained SST anomalies combined with persistent moderate El Nino conditions could push observed ACE at least 25% beyond that upper bound, a scenario that would place 2026 among the most active eastern Pacific seasons on record. That possibility is not a prediction but a conditional stress test: it depends on ocean heat holding steady through the peak months of July through September and on wind shear remaining suppressed.
Another wild card is storm track. High ACE does not automatically translate into more landfalls in Mexico or the United States; some of the most energetic seasons on record featured storms that curved harmlessly out to sea. However, if the large-scale steering pattern favors west-northwest motion parallel to the Mexican coast, even offshore hurricanes can generate damaging surf, coastal erosion, and dangerous marine conditions for shipping and fishing fleets. A handful of landfalling systems, particularly if they undergo rapid intensification close to shore, would dramatically increase impacts even without pushing ACE beyond NOAA’s projected range.
Gaps in the forecast and what to watch next
Several pieces of the puzzle are missing from the public record. NOAA has not yet released detailed, storm-by-storm analog comparisons that would show which past seasons most closely resemble the current configuration of ocean temperatures and atmospheric patterns. Those analogs can help local forecasters and emergency managers anticipate the types of hazards most likely to recur, whether that means repeated landfalls in a particular stretch of coastline or a cluster of long-lived major hurricanes that stay offshore but churn up dangerous swells.
Uncertainty also surrounds how quickly El Nino conditions might weaken as the season progresses. If the event decays faster than expected, vertical wind shear over parts of the eastern Pacific could increase during the peak months, tempering storm intensity even if sea-surface temperatures remain elevated. Conversely, a stubbornly strong El Nino would keep shear suppressed for longer, extending the window for high-end hurricanes and late-season storms that form closer to the Baja Peninsula or even send remnant moisture into the U.S. Southwest.
For coastal communities, the most practical step over the next several weeks is to watch for updates to the seasonal outlook and for early signals in the first few storms that form. An active June or early July, with multiple systems reaching hurricane strength, would lend weight to the upper half of NOAA’s projected ranges for storm counts and ACE. A sluggish start, especially if paired with signs of weakening El Nino, might suggest a season that still ends above normal but closer to the lower end of the forecast envelope.
In the meantime, the 70% above-normal probability should be treated less as a precise prediction and more as a warning shot. It indicates that the background climate conditions in the eastern Pacific are primed for an energetic season, and that the odds of multiple impactful storms are materially higher than usual. For decision-makers from Baja California to Southern California, the message embedded in NOAA’s numbers is clear: use the early part of the season to close readiness gaps, because waiting for certainty could mean waiting until the first hurricane is already on the doorstep.
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*This article was researched with the help of AI, with human editors creating the final content.
