Meteorological Assessment: The 2026 Tornado Season Outlook and the Climatological Implications of a Decaying La Niña

Abstract

The vernal equinox of 2026 heralds a pivotal and complex atmospheric transition for the North American continent. Following a persistent La Niña event that dominated the winter of 2025-2026, the equatorial Pacific Ocean is currently undergoing a significant phase change toward El Niño-Southern Oscillation (ENSO) neutrality. This report provides an exhaustive, multi-dimensional analysis of the 2026 tornado season outlook, synthesizing the latest data from the Climate Prediction Center (CPC), historical analog years, and recent peer-reviewed literature regarding spatial shifts in tornadogenesis. The analysis suggests that the 2026 season sits at a volatile intersection of two competing signals: the lingering atmospheric angular momentum of a La Niña spring, which historically favors the Southeast, and a rapid oceanic transition that may reawaken the traditional "Tornado Alley" in the Southern Plains. This document explores the synoptic physics, thermodynamic boundary conditions, and sociological implications of a severe weather season that bears striking resemblances to the volatile spring of 1974.

1. Introduction: The Atmospheric Stage for 2026

The prediction of seasonal tornado activity remains one of the most formidable challenges in modern synoptic meteorology. Unlike temperature or precipitation outlooks, which rely on broad, planetary-scale thermodynamic trends that can be modeled weeks or months in advance, tornado forecasting requires the precise, micro-scale phasing of kinematic (wind shear) and thermodynamic (instability) variables. A season is not defined by the average flow, but by the specific, often chaotic, intersections of these variables. However, large-scale teleconnections—the global links between ocean temperatures and atmospheric circulation—provide a probabilistic roadmap, a "risk terrain" upon which the season’s weather events will play out.

As the United States moves through the early months of 2026, the primary driver of interannual climate variability, the El Niño-Southern Oscillation (ENSO), is in a state of flux. Data from January 2026 indicates that while a La Niña advisory remains technically in effect, the system is decaying. The Climate Prediction Center (CPC) reports a 75% probability of a transition to ENSO-neutral conditions during the January-March (JFM) period.¹ This "decaying La Niña" scenario is meteorologically distinct from a persistent La Niña (as seen in 2011 or 2022) or a stable Neutral basin. The transition phase—where the ocean surface cools or warms, but the vast inertia of the atmosphere has yet to adjust—creates unique patterns of jet stream variability that have, in the past, facilitated some of the most destructive severe weather outbreaks in recorded history.

This report seeks to deconstruct the 2026 outlook through a rigorous examination of the physical mechanisms at play. We will explore the "hysteresis" of the atmosphere—its tendency to lag behind oceanic changes—and how this memory might keep the jet stream in a La Niña-like configuration well into April. We will investigate the thermodynamic "fuel" provided by the Gulf of Mexico, which currently exhibits significant warm anomalies.² We will also contextualize the 2026 forecast within the broader, secular shift of tornado frequency away from the Great Plains and toward the "Dixie Alley" of the Southeast—a trend identified by researchers such as Gensini and Brooks.³ By synthesizing these diverse data streams, this report aims to provide a comprehensive, narrative-driven assessment of the severe weather risks facing the continental United States in the spring of 2026.

2. The Physics of the 2026 Atmosphere

To understand the outlook for 2026, one must first descend into the mechanics of the planetary circulation. The atmosphere is a fluid engine, driven by the temperature difference between the equator and the poles. The rotation of the Earth organizes this flow into bands of winds—the jet streams—which act as the steering currents for storm systems. The ENSO cycle is the "throttle" that modulates this engine.

2.1 The Mechanics of the La Niña Decay

As of January 2026, the central and eastern equatorial Pacific Ocean has been cooler than average, a hallmark of La Niña.¹ In a La Niña state, the trade winds blow fiercely from east to west, piling warm water up against Indonesia and Australia. This creates a vigorous loop of rising air over the western Pacific and sinking air over the eastern Pacific, known as the Walker Circulation.

However, the 2026 data shows signs of a breakdown in this engine. The "decay" of La Niña is often triggered by a downwelling Kelvin wave—a massive, subsurface pulse of warm water that travels eastward along the equator, counteracting the cool surface waters.¹ As this warm water breaches the surface, the temperature gradient across the Pacific weakens. The trade winds relax. The Walker Circulation slows.

For the tornado season, this oceanic collapse is critical because it changes the angular momentum of the atmosphere. During the peak of La Niña, the atmosphere loses angular momentum to the solid Earth due to the friction of the strong trade winds. As La Niña fades in the spring of 2026, the atmosphere will regain this momentum. This injection of energy often spins up the subtropical jet stream—a ribbon of high-speed winds at cruising altitude that flows across the southern United States. A stronger subtropical jet stream over the southern U.S. is a key ingredient for severe weather, as it provides the deep-layer wind shear necessary to organize thunderstorms into supercells.

2.2 Atmospheric Hysteresis: The Lag Effect

A central theme of the 2026 outlook is the concept of "atmospheric lag." While the ocean may reach "neutral" temperatures (defined as anomalies between -0.5°C and +0.5°C) by March 2026 ¹, the atmosphere does not respond instantly. It has "memory." The global wind patterns established during the winter of 2025-2026—specifically the ridging over the North Pacific and the troughing over the eastern U.S.—are likely to persist into the spring.

This phenomenon is crucial for forecasting because it suggests that the effective climate for the spring of 2026 will behave more like a La Niña spring than a neutral one.⁵ In a typical La Niña spring, the Polar Jet Stream dives southward into the central U.S., bringing cool, dry air. Meanwhile, the Subtropical Jet (influenced by that regaining of angular momentum) pumps moisture northward. The clash of these air masses over the Mississippi and Ohio Valleys creates the "baroclinic zones"—fronts—where storms ignite.

Forecasts for Week 3-4 in January 2026 already show this pattern: a ridge over Alaska and the North Pacific, forcing downstream troughing into the central U.S..² If this pattern locks in, as it often does during decaying La Niña events, it creates a "northwest flow" aloft. This flow pattern is notorious for producing "high-shear, low-CAPE" events in the Southeast, where tornadoes can form even with limited instability, and "cold-core" severe weather events in the Midwest.

2.3 The Spring Barrier and Prediction Skill

Meteorologists often speak of the "Spring Predictability Barrier," a period in March and April when dynamic models struggle to forecast the evolution of ENSO. This barrier exists because the trade winds are naturally weakest during the spring transition, making the coupled ocean-atmosphere system highly sensitive to small changes.

For 2026, this barrier implies that while the consensus is a transition to Neutral ¹, the speed of that transition is uncertain. A faster transition could rapidly warm the Pacific, potentially shifting the focus of tornado activity westward back into the Plains (as discussed in Section 5). A slower transition would keep the focus on the Southeast (Dixie Alley). The current forecast of a 75% chance of Neutral by JFM suggests a relatively brisk transition, which historically correlates with volatile, high-energy spring seasons.

3. The Thermodynamic Engine: Gulf of Mexico SSTs

If the jet stream is the match that lights the fire, the warm, moist air from the Gulf of Mexico is the gasoline. No matter how favorable the wind shear profiles are, severe thunderstorms cannot exist without "Convective Available Potential Energy" (CAPE)—the buoyancy that allows air parcels to rise explosively.

3.1 The Role of Sea Surface Temperatures (SSTs)

Research has consistently shown a strong correlation between the temperature of the Gulf of Mexico in early spring and the severity of the subsequent tornado season. A warmer Gulf leads to higher evaporation rates. This moisture is transported northward by the low-level jet (a corridor of strong winds around 5,000 feet above the ground) into the warm sector of approaching storm systems.

For the spring of 2026, the outlook is concerning. Snippets indicate that "warm temperature anomalies now stretch eastward" in the Pacific, and more importantly, the Gulf of Mexico is prone to retaining heat.² Specific data points from recent years indicate a trend of "Marine Heatwaves" in the region.⁶ When the Gulf waters are 1°C or 2°C above average, the dewpoint temperatures of the air flowing into the southern U.S. can rise proportionally.

Why does a degree or two matter? The relationship between temperature and moisture capacity is non-linear, described by the Clausius-Clapeyron relation (though we avoid the equation here, the principle is vital). A small increase in water temperature leads to a significant increase in the water vapor content of the air. When this moisture-rich air is lifted, it releases latent heat, which further warms the air parcel, making it rise even faster. This increases the CAPE significantly.

3.2 The Loop Current and Moisture Return

A specific feature to watch in 2026 is the Loop Current, a river of warm Caribbean water that flows into the Gulf, loops up toward Louisiana, and exits through the Florida Straits. In years where the Loop Current extends far north, it provides a deep reservoir of heat that is not easily cooled by the passage of cold fronts.

In the winter of 2025-2026, the frequent passage of cold fronts driven by the La Niña pattern might superficially cool the surface of the Gulf. However, if the Loop Current remains robust, the "Ocean Heat Content" (the heat stored at depth) will allow the surface temperatures to rebound rapidly in March and April.² This "rapid moisture return" capability is a hallmark of active tornado seasons. It means that even after a strong cold front clears the Gulf of moisture, a few days of southerly winds can fully recharge the atmosphere for the next storm system.

3.3 Drought and the Dryline Connection

Another thermodynamic factor for 2026 is the soil moisture status in the High Plains. Reports indicate expanding drought conditions in central Colorado and parts of the Southern Plains as of early 2026.⁷

Dry soil heats up faster than moist soil. This leads to a deeper, hotter "mixed layer" of air in the desert southwest and High Plains. When this hot, dry air moves eastward, it overlays the moist air returning from the Gulf. This interface is the "dryline."

A sharp dryline is a primary focus mechanism for supercell thunderstorms. The juxtaposition of extreme drought to the west and a warm Gulf to the east creates an intense gradient of density and temperature. For 2026, the presence of drought in Colorado and the Plains ⁷ suggests that the dryline will be sharp and potent. Storms that form on this boundary will have access to high cloud bases and steep lapse rates (rapid cooling with height), conditions that favor large hail and, if the low-level shear is present, tornadoes.

4. The Climatological Shift: Anatomy of the New "Tornado Alley"

Any analysis of the 2026 season must be contextualized within the broader, secular changes occurring in the climatology of U.S. tornadoes. The "textbook" understanding of Tornado Alley—a north-south corridor stretching from Texas to South Dakota—is being rewritten by a changing climate.

4.1 The Eastward March

Groundbreaking research by Gensini and Brooks (2018) and subsequent studies have statistically verified a spatial shift in tornado frequency. Comparing the period of 1979-2017 to earlier records, they found significant decreasing trends in tornado environments over the traditional High Plains (Texas, Oklahoma, Colorado) and significant increasing trends in the Midwest and Southeast (Mississippi, Alabama, Tennessee, Kentucky, Illinois, Indiana).⁴

This shift is not merely a statistical artifact; it is driven by physical changes in the atmosphere. The expansion of the Hadley Cell (the tropical circulation) and the drying of the American West are pushing the "dryline" zone eastward. Consequently, the collision zone between dry desert air and moist Gulf air is occurring more frequently over the Mississippi River than over the Great Plains.

For 2026, this shift is particularly relevant because the La Niña-to-Neutral transition pattern often favors storm tracks that align perfectly with this "new" alley. The jet stream configuration expected in March and April 2026 (digging troughs into the central U.S.) tends to eject energy into the Tennessee and Ohio Valleys.³

4.2 The "Dixie Alley" Vulnerability

The shift toward the Southeast, often called "Dixie Alley," drastically changes the societal risk profile for 2026. The nature of the threat in the Southeast differs fundamentally from the Plains:

1. Population Density: The Southeast and Midwest are far more densely populated than the High Plains. A tornado in western Kansas might hit nothing but wheat; a tornado in Alabama is likely to strike a town.

2. Visibility: The "jungle" of the Southeast—dense pine forests and rolling hills—obscures tornadoes. Spotters cannot see storms from miles away as they can in Oklahoma.

3. Nocturnal Climatology: Research indicates that the Southeast has a much higher proportion of nocturnal (nighttime) tornadoes. The 2026 setup, with its potential for high shear and forcing, supports storm modes that persist well after sunset. Nighttime tornadoes are more than twice as deadly as daytime ones because residents are asleep and visual confirmation is impossible.

4. Housing Stock: The Southeast has a higher density of manufactured housing (mobile homes) than the Northeast or Midwest. These structures offer significantly less protection against tornadic winds.

The 2026 outlook, therefore, must be viewed not just as a count of potential tornadoes, but as a forecast of impact. The convergence of the La Niña transition pattern with the "Dixie Alley" vulnerability suggests a season with a high potential for mass-casualty events, regardless of whether the total tornado count breaks records.

5. Historical Analogs: The Ghosts of Seasons Past

Meteorologists use "analog forecasting" as a primary tool for seasonal prediction. By finding past years with similar ENSO trajectories (La Niña decaying to Neutral in spring), we can construct a range of potential outcomes. For 2026, the analog years paint a vivid and somewhat alarming picture.

5.1 The 1974 Analog: The Super Outbreak Scenario

The most compelling and concerning analog for the 2026 transition is 1974. The winter of 1973-1974 was characterized by a strong La Niña.⁹ By the spring of 1974, this La Niña was rapidly decaying toward neutral conditions, a trajectory almost identical to the CPC's forecast for 2026.¹

This rapid oceanic collapse in 1974 coincided with the "Super Outbreak" of April 3-4, 1974. Over a period of just 16 hours, 148 tornadoes touched down across 13 states, including 30 violent tornadoes (rated F4 or F5).¹⁰ The meteorological setup involved a potent, negatively tilted trough (a low-pressure system leaning backward, which enhances lift) interacting with a jet stream that was still "charged" with the angular momentum of the fading La Niña.

The lesson from 1974 for the 2026 outlook is that the transition period is dangerous. A decaying La Niña does not mean decaying weather; often, it means the opposite. The relaxing trade winds release energy into the mid-latitudes, and the atmosphere remains primed for violent shear profiles. If the 2026 transition follows the 1974 curve, the window from late March to mid-April becomes a "Red Zone" for the Ohio and Tennessee Valleys.¹²

5.2 The 2011 Distinction: Resurgent vs. Decaying

Comparisons are frequently made to 2011, another historic year that produced the Tuscaloosa-Birmingham and Joplin tornadoes. However, 2011 was meteorologically distinct from the 2026 forecast. In 2011, the La Niña did not decay; it resurged. The cool anomalies persisted and strengthened through the spring.¹³

This "locked-in" La Niña pattern in 2011 kept the storm track consistently over the Deep South and Southeast for months. While 2026 is expected to transition to Neutral, this distinction is important. A transitioning year (like 2026 is forecast to be) often spreads the risk over a wider geographic area, moving northward and westward as the season progresses, whereas a resurgent year (like 2011) focuses the risk intensely on the Southeast.¹⁵

However, the "Dixie Alley" risk remains high in both scenarios during the early season (February-March). The difference will likely manifest in late April and May. In 2011, the Southeast kept getting hit. In 2026, we might see the risk shift toward the Midwest or even back toward the Plains (see Section 6) as the Pacific warms.¹⁵

5.3 The 2008 Analog: Super Tuesday

Another relevant analog is 2008. Like 2026, 2008 saw a La Niña present in the winter. In February 2008, while La Niña was still active, the "Super Tuesday" outbreak occurred, devastating parts of Tennessee and Arkansas. This event serves as a reminder that the severe weather season is starting earlier. With the background warming of the climate, the Gulf of Mexico is ready for business in February. The 2026 outlook must consider that "Spring" tornado season effectively begins in late winter.

5.4 1982 and the Neutral Spring

1982 offers a slightly different perspective. It featured a transition from a weak La Niña/Neutral winter to a very strong El Niño by the following summer. The spring of 1982 was the transition period. It resulted in a highly active season, including the April 2-3 outbreak which produced 61 tornadoes.¹⁶ This reinforces the signal that change in the Pacific—the movement from cold to warm—is a driver of instability.

Analog Year	ENSO Trajectory (Winter -> Spring)	Notable Outcome	Relevance to 2026
1974	Strong La Niña -> Neutral	Super Outbreak (April 3-4)	High. Matches the rapid decay forecast. Signals extreme risk for Ohio Valley.
2011	Moderate La Niña -> Resurgent La Niña	Super Outbreak (April 25-28)	Moderate. 2026 is expected to decay, not resurge, but early season risks are similar.
2008	La Niña -> Neutral	Super Tuesday Outbreak (Feb)	High. Warning for early season (Feb/Mar) volatility in the Mid-South.
1982	Neutral -> El Niño	Major April Outbreak	High. Demonstrates volatility of "rapid warming" transition years.

Table 1: Comparative analysis of historical analog years and their relevance to the 2026 forecast.

6. Regional and Monthly Outlooks for 2026

Synthesizing the ENSO transition, the thermodynamic data, and the historical analogs, we can construct a probabilistic timeline for the 2026 season.

6.1 February 2026: The Early Awakening

• Target Region: Gulf Coast States (LA, MS, AL, GA).

• Outlook: Active.

• Analysis: With La Niña still holding influence ¹, the subtropical jet will be active across the South. The anomalously warm Gulf ² means that cold fronts penetrating the Deep South will encounter rich moisture. Expect "High Shear, Low CAPE" (HSLC) events, which are notorious for producing fast-moving, nocturnal QLCS (Quasi-Linear Convective System) tornadoes.

6.2 March 2026: The Transition Battleground

• Target Region: The "Arklatex" (AR, LA, TX) and Tennessee Valley (TN, KY).

• Outlook: Above Average.

• Analysis: March is often the month where the atmosphere begins to "sense" the decaying La Niña. The polar jet may begin to retreat, but deep troughs will still dig into the central U.S. The 2008 analog suggests a high potential for a major outbreak in the mid-South during this period. The focus will likely be on the "Dixie Alley" corridor.

6.3 April 2026: The Red Zone

• Target Region: Southern Plains (OK/TX) extending into the Ohio Valley (IN, OH).

• Outlook: Volatile / High Risk.

• Analysis: This is the most critical month. As the Pacific warms toward Neutral, research suggests a potential shift back toward the Plains. Snippet ¹⁵ notes that a "La Niña transitioning to El Niño" (or rapid warming) boosts the likelihood of outbreaks in Kansas and Oklahoma by up to 50% in April. This contradicts the pure "Dixie Alley" narrative and suggests a "return to the Plains" scenario.

• However, the 1974 analog warns that if the phasing is right, the Ohio Valley (north of the 2011 track) is in the crosshairs. The 2026 outlook envisions a "dual-threat" April: the dryline becoming active in Oklahoma (due to the drought/instability contrast) and major synoptic systems sweeping east to impact Indiana and Ohio.

6.4 May and June 2026: The Northern Retreat

• Target Region: Upper Midwest (IA, MN, WI) and High Plains.

• Outlook: Variable.

• Analysis: As ENSO-neutral takes hold, the jet stream usually weakens and lifts north. However, "blocking" patterns in the North Atlantic (negative NAO) can cause systems to stall. Recent years have seen late-season activity in Iowa and Minnesota.¹⁷ If the transition to El Niño accelerates in summer (as hinted in ¹), the season might shut down abruptly in June, leading to a hot, dry summer for the Plains.

7. The "Wildcards": Sub-Seasonal Variability

While the seasonal outlook provides the background, the specific timing of outbreaks is governed by sub-seasonal oscillations.

7.1 The Madden-Julian Oscillation (MJO)

The MJO is a pulse of cloudiness and rain that circles the equator every 30-60 days. It is the chaos factor.

• The Danger Phase: When the MJO moves into Phases 6, 7, and 8 (Western Pacific and Western Hemisphere), it amplifies the jet stream over North America.

• 2026 Implication: Snippets indicate the MJO was "weak and disorganized" in Jan 2026 ², but if it organizes into a coherent wave in April, it could synchronize with the La Niña decay to produce a "mega-outbreak." Conversely, if the MJO stalls in the suppressed phases (Phases 1-3) during peak spring, it could lead to a "death ridge" that shuts down tornado activity for weeks, even if the ENSO background is favorable.

7.2 Soil Moisture Feedback

The drought in Colorado and the Southern Plains ⁷ acts as a thermal anchor.

• The Mechanism: Dry soil has low "specific heat capacity." It heats up rapidly under the spring sun. This creates a "thermal low" pressure system over the High Plains.

• The Result: This thermal low enhances the pressure gradient across Texas. Stronger pressure gradients mean stronger southerly winds drawing moisture from the Gulf. Therefore, the drought to the west actually enhances the severe weather potential to the east (in Oklahoma and Arkansas) by supercharging the inflow of fuel.

8. Societal Impacts and Resilience

The 2026 outlook paints a picture of a season with high "disaster potential." The intersection of meteorological hazard and societal vulnerability is where catastrophe occurs.

8.1 The "Warning Span" Gap

With the forecast heavily implicating the Southeast and Ohio Valley, the issue of radar coverage becomes paramount. The "NEXRAD" radar network has known gaps in lower-level coverage due to the curvature of the earth, particularly in parts of southern Missouri and Arkansas. Storms in these areas can produce low-level rotation that is undetectable until it is too late. The 2026 season underscores the need for "phased array" radar upgrades and the integration of satellite detection methods.

8.2 The Mobile Home Vulnerability

The Southeast's high density of mobile homes is the single greatest factor in tornado lethality. A "moderate" tornado (EF2) that might destroy a roof in a suburban home can completely obliterate a mobile home. With the 2026 outlook favoring the "Dixie Alley" corridor in early spring, emergency managers must emphasize that "safe" shelter often means leaving one's home entirely for a community shelter.

8.3 "Warning Fatigue"

In a La Niña spring, the shear is often high, but the instability (CAPE) can be marginal. This leads to many days with "Tornado Watches" but few tornadoes, or messy storm modes (squall lines) that produce many false alarms. This breeds "warning fatigue." If 2026 produces a string of "high shear, low CAPE" bust days followed by a volatile 1974-style setup, the public may be desensitized. NWS offices will need to use precise, impact-based language ("This is a particularly dangerous situation") to cut through the noise.

9. Conclusion

The 2026 tornado season is poised to be a significant chapter in the meteorological history of the United States. The forecast signals—a decaying La Niña, a warm Gulf, and a distinct lack of "blocking" mechanisms—align to suggest an active, front-loaded, and geographically expansive season.

The "ghost of 1974" looms large over this forecast. The parallel transition from a strong La Niña winter to a Neutral spring is a signal that cannot be ignored. It suggests that the atmosphere will remain energetic and volatile well into April. The risks are distributed but distinct: an early-season threat to the Deep South (Dixie Alley) that likely expands explosively into the Ohio Valley and perhaps reclaims the Southern Plains in April.

However, meteorology is a science of probability, not destiny. The "Wildcards"—the timing of the MJO, the nuances of the Gulf Loop Current, and the chaotic nature of individual storm initiation—will determine whether 2026 is merely an active year or a historic one.

For the communities in the path—from the pine forests of Alabama to the cornfields of Indiana—the message is one of vigilance. The large-scale tumblers of the atmosphere are clicking into a configuration that demands respect. The 2026 season serves as a stark reminder that even as we improve our ability to predict the climate of tornadoes, the weather of tornadoes remains a fierce and untamable force.

Data Tables and Climatological Indices

To provide a rigorous reference for this outlook, the following tables summarize the key indices and historical comparisons used in this analysis.

Table 2: Monthly ENSO Progression of Analog Years vs. 2026 Forecast

Comparing the Oceanic Niño Index (ONI) trajectory.

Year	DJF (Winter)	JFM (Early Spring)	FMA (Mid-Spring)	MAM (Late Spring)	Outcome
1974	-1.7°C (Strong)	-1.5°C	-1.2°C	-1.0°C	Super Outbreak (April)
2008	-1.5°C (Strong)	-1.3°C	-1.0°C	-0.8°C	Super Tuesday Outbreak (Feb)
2011	-1.3°C (Mod)	-1.0°C	-0.8°C	-0.6°C	Super Outbreak (April)
2026 (Fcst)	~ -0.8°C (Weak)	Transitioning	Neutral Range	Neutral	Projected Volatility

Note: While 2026 starts from a "weaker" La Niña base than 1974, the slope of the transition (the rate of warming) is the critical dynamic factor. Source:.¹

Table 3: Regional Risk Matrix for Spring 2026

Region	Primary Threat Period	Dominant Storm Mode	Forecast Confidence
Deep South (Dixie Alley)	Feb - Late March	QLCS / Nocturnal Supercells	High
Ohio Valley	Late March - April	Fast-moving Supercells	Moderate (Dependent on Jet)
Southern Plains	April - May	Dryline Supercells	Moderate (Dependent on Transition)
Upper Midwest	May - June	Cold-core / Linear Systems	Low (Late Season)

This matrix synthesizes the Gensini/Brooks spatial shift data ⁴ with the specific teleconnection forcing forecast for 2026.

Works cited

1. Climate Prediction Center: ENSO Diagnostic Discussion - NOAA, accessed January 8, 2026, https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/ensodisc.shtml

2. Week 3-4 Outlook - Climate Prediction Center - NOAA, accessed January 8, 2026, https://www.cpc.ncep.noaa.gov/products/predictions/WK34/

3. A Comprehensive Analysis of the Spatial and Seasonal Shifts in Tornado Activity in the United States in - AMS Journals, accessed January 8, 2026, https://journals.ametsoc.org/view/journals/apme/63/6/JAMC-D-23-0143.1.xml

4. Spatial trends in United States tornado frequency - the NOAA Institutional Repository, accessed January 8, 2026, https://repository.library.noaa.gov/view/noaa/32230

5. Forecasters Say La Niña to Fade Early Next Year, Neutral Pacific Conditions Likely, accessed January 8, 2026, https://www.claimsjournal.com/news/national/2025/12/12/334549.htm

6. The California Current Marine Heatwave Tracker - Blobtracker | Integrated Ecosystem Assessment - NOAA, accessed January 8, 2026, https://www.integratedecosystemassessment.noaa.gov/regions/california-current/california-current-marine-heatwave-tracker-blobtracker

7. Summary | U.S. Drought Monitor, accessed January 8, 2026, https://droughtmonitor.unl.edu/summary.aspx

8. Study: U.S. tornado frequency shifting eastward from Great Plains - PreventionWeb.net, accessed January 8, 2026, https://www.preventionweb.net/news/study-us-tornado-frequency-shifting-eastward-great-plains

9. El Niño and La Niña Years and Intensities - Golden Gate Weather Services, accessed January 8, 2026, https://ggweather.com/enso/oni.htm

10. The Super Outbreak of April 3-4, 1974 - National Weather Service, accessed January 8, 2026, https://www.weather.gov/iln/19740403

11. 1974 Super Outbreak - Wikipedia, accessed January 8, 2026, https://en.wikipedia.org/wiki/1974_Super_Outbreak

12. April 3-4 1974 Super Outbreak - ArcGIS StoryMaps, accessed January 8, 2026, https://storymaps.arcgis.com/stories/dbf8ceb877ba48588190bc382b33b681

13. Could ENSO flavors help scientists predict regional tornado outbreaks in the U.S.? - Climate, accessed January 8, 2026, https://www.climate.gov/news-features/featured-images/could-enso-flavors-help-scientists-predict-regional-tornado-outbreaks

14. El Niño / Southern Oscillation (ENSO) | Equatorial Pacific Sea Surface Temperatures (SST) | National Centers for Environmental Information (NCEI) - NOAA, accessed January 8, 2026, https://www.ncei.noaa.gov/access/monitoring/enso/sst

15. U.S. regional tornado outbreaks and their links to spring ENSO phases and North Atlantic SST variability - Geophysical Fluid Dynamics Laboratory, accessed January 8, 2026, https://www.gfdl.noaa.gov/research_highlight/u-s-regional-tornado-outbreaks-and-their-links-to-spring-enso-phases-and-north-atlantic-sst-variability/

16. 2011 Tornado Season Climate Factors: NOAA Physical Sciences Laboratory, accessed January 8, 2026, https://psl.noaa.gov/csi/events/2011/tornadoes/enso.html

17. Winter 2025-26 Outlook - National Weather Service, accessed January 8, 2026, https://www.weather.gov/arx/winter2526outlook