FlySafe was not operational during this event. This analysis reconstructs publicly available signals — to demonstrate how predictive airspace intelligence could have provided advance warning.
Popocatépetl — 13 Eruptions in 24 Hours
February 2024 — Rapid-Fire Explosions, 22 Flights Cancelled
On February 18, 2024, Popocatépetl entered a phase of rapid-fire explosions — 13 in a single 24-hour period. Ash columns reached 6 km above the crater. For Mexico City's Benito Juárez International Airport (AICM), 70 km away, this was not unprecedented — it was the recurring nightmare. 22 flights were cancelled. Ash fell across suburbs on the eastern edge of the metro area. CENAPRED maintained Yellow Phase 2 alert. Less than a year after the May 2023 crisis, Popocatépetl was reminding 21 million people and one of the world's busiest airports that the volcano does not rest.
What Happened
Between February 18 and 19, 2024, Popocatépetl — Mexico's most active stratovolcano — produced 13 discrete explosions within a single 24-hour window, sending ash columns to approximately 6 km above the crater rim, or roughly 11.4 km above sea level. The event was not an isolated spike but a peak episode within a prolonged sequence of heightened activity that had been building since 2023, making it one of the most operationally disruptive volcanic episodes in recent Mexican aviation history.
Ash fall was reported across eastern suburbs of Mexico City and communities in the direction of Puebla, carried on prevailing winds from the volcano's summit at 5,426 m. Centro Nacional de Prevención de Desastres (CENAPRED) maintained its Amarillo Fase 2 (Yellow Phase 2) alert throughout the period — the same level that has characterised the volcano's baseline since activity intensified — signalling ongoing explosive activity with the potential for ballistic operational events within 12 km and continuous ash emission affecting the surrounding metropolitan corridor.
The Washington Volcanic Ash Advisory Centre (VAAC) issued a series of SIGMETs for the MMEX FIR (Mexico FIR), creating mandatory instrument-flight avoidance corridors that cascaded directly into departure and arrival sequencing at Aeropuerto Internacional Benito Juárez (AICM, MMMX) — the primary hub serving greater Mexico City, located just 70 km northwest of the crater. The result was the cancellation of 22 scheduled commercial flights operated by Volaris, VivaAerobus, and Aeroméxico.
- Elevation: 5,426 m ASL — highest active volcano in North America
- Eruption history: Documented since 1354 — continuously active
- Alert level: CENAPRED Amarillo Fase 2 (Yellow Phase 2)
- Ash plume ceiling: ~11.4 km ASL — penetrating jet cruising altitudes
- Population exposure: 25+ million people within 100 km radius
- Airport affected: AICM (MMMX) — 70 km NW of crater
- Flights cancelled: 22 commercial services
- Carriers impacted: Volaris, VivaAerobus, Aeroméxico
- FIR affected: MMEX FIR — SIGMETs issued by Washington VAAC
- Ash fall zone: Eastern Mexico City suburbs, Puebla corridor
Warning Signs
The February 2024 eruption episode did not emerge without precursors. Popocatépetl's activity profile had been elevated continuously since mid-2023, with CENAPRED reporting above-normal seismic tremor, increased exhalation frequency, and recurring minor explosions in the months preceding the February peak. For aviation risk systems monitoring the right data streams, a 24-to-48-hour warning window was operationally achievable. The following signals were observable and quantifiable before the critical escalation on February 18.
CENAPRED daily bulletins throughout early February 2024 recorded increasing exhalation counts and elevated SO₂ flux — both recognised precursors to explosive paroxysm events. The Yellow Phase 2 alert, while maintained at a static label, contained escalating qualitative descriptors in the days preceding February 18. Systematic NLP parsing of these bulletins may have flagged the upward trajectory at least 36 hours before the 13-explosion sequence commenced.
Washington VAAC had been issuing periodic Volcanic Ash Advisories for Popocatépetl in the weeks leading up to February 18. The cadence and geographical extent of these advisories increased measurably in the 48 hours prior to the critical window — a signal that trajectory modelling within the MMEX FIR was already detecting ash injection at altitude. Each advisory update represented a refinement of predicted ash cloud boundaries, directly constraining the usable airspace envelope around MMMX.
AICM sits 70 km northwest of the crater. Prevailing winds in February route ash plumes preferentially toward the northwest — directly onto approach and departure paths for runways 05L/R and 23L/R. Any eruption exceeding 8 km ASL with northwest drift immediately threatens SID and STAR corridors. The February 18 plumes at 11.4 km ASL, under actual wind conditions, created an objective engine-ingestion risk for aircraft operating standard RNAV procedures at MMMX.
The February 2024 episode was explicitly characterised by CENAPRED as a continuation of heightened activity that had begun in 2023. This is a critical contextual signal: the volcano had already demonstrated its capacity for rapid-fire explosive sequences in recent months. Airlines and dispatchers operating without a systematic volcanic risk monitoring framework were likely treating the Yellow Phase 2 status as static background noise rather than an active, escalating risk condition requiring enhanced contingency planning.
Satellite-derived sulphur dioxide measurements provide a leading indicator for magmatic degassing intensity, correlating with conduit pressurisation ahead of explosive events. Elevated SO₂ column densities over Popocatépetl in the days preceding February 18 were consistent with the intensified explosive sequence that followed. These data streams are publicly available in near-real-time and represent an under-utilised layer for aviation operational risk systems.
Timeline
Popocatépetl enters a period of sustained heightened activity. CENAPRED records above-average daily exhalation counts, intermittent low-intensity explosions, and elevated seismic tremor. Washington VAAC begins issuing more frequent Volcanic Ash Advisories for the MMEX FIR. Airlines operating MMMX routes begin encountering sporadic SIGMET-related routing adjustments but no systematic cancellation events. Alert level remains at Amarillo Fase 2 — the same level that will be in force during the February peak.
CENAPRED daily bulletins in the first two weeks of February document a measurable increase in explosion frequency and intensity. Ash emissions from minor events are reported reaching 2–3 km above the crater. The VAAC advisory cadence for Popocatépetl increases. Mexico's Dirección General de Aeronáutica Civil (DGAC) maintains routine NOTAM coverage for the MMMX area. No pre-emptive operational changes are announced by the three major affected carriers — Volaris, VivaAerobus, or Aeroméxico.
The 24-hour window of 13 explosions commences. Initial blasts in the early hours of February 18 produce ash columns that rapidly build to 6 km above the crater rim — approximately 11.4 km ASL, well into the flight levels used by commercial jet traffic. Washington VAAC issues the first SIGMETs for the MMEX FIR reflecting the new hazard ceiling. Mexico City's eastern suburbs begin reporting ashfall. CENAPRED does not raise the alert level above Amarillo Fase 2 but publishes special bulletins documenting the intensification.
As the explosion sequence continues through the night and into February 19, Washington VAAC updates and extends SIGMET polygons over the MMEX FIR to reflect evolving ash cloud trajectories. The 70 km proximity of AICM to the crater, combined with northwest ash drift, places departure and approach corridors directly inside the hazard zone. Mexico DGAC issues NOTAMs restricting portions of the airspace. Volaris, VivaAerobus, and Aeroméxico begin executing cancellations — the final total reaches 22 commercial flights. Passengers are left stranded or rebooked across subsequent days.
The 13th explosion of the sequence occurs. Ashfall accumulates in communities to the east of Mexico City toward Puebla (population 3.2 million). Schools and businesses in affected municipalities issue closures. CENAPRED and civil protection authorities issue public guidance on ash exposure precautions. The combined Mexico City-Puebla-Toluca metropolitan corridor — home to over 25 million people — remains on alert. The Washington VAAC continues tracking the ash cloud's dispersal trajectory across the MMEX FIR.
Explosion frequency decreases following the 24-hour peak. Washington VAAC begins withdrawing or downgrading SIGMET coverage as ash cloud concentrations fall below engine-safety thresholds. Mexico DGAC lifts airspace restrictions in phases. Airlines begin processing rebookings for the 22 cancelled services. CENAPRED maintains Amarillo Fase 2 and notes that the volcano remains capable of resumed explosive activity — underscoring the persistent rather than resolved nature of the hazard. The eruption cycle that began in 2023 continues.
Aviation Impact
The February 18–19 event demonstrated how a single volcanic escalation episode — even one that does not trigger an alert level change — can translate directly into measurable operational disruption at a major hub airport. All quantified impacts below are direct consequences of the 13-explosion sequence and the associated SIGMET and NOTAM environment it generated.
Volaris, VivaAerobus, and Aeroméxico each suspended services across the 24-hour window. AICM is Mexico's busiest airport and the primary connecting hub for domestic and international routes, meaning downstream delays propagated across the national network well beyond the directly cancelled services.
The average inter-explosion interval was under 2 hours, meaning that even as VAAC modellers cleared one ash advisory polygon, a new injection event was refreshing the hazard. This rapid-fire tempo made conventional reactive decision-making — wait for the SIGMET, then cancel — operationally inadequate for minimising passenger impact.
At 11.4 km ASL, ash penetrated FL370 — standard cruise altitude for narrow-body jets on domestic Mexican routes. This placed ash particles directly within the operating envelope of aircraft climbing out of or descending into MMMX, creating certified engine-damage risk thresholds that ICAO Annex 2 prohibits flying through without explicit safety justification.
No other active volcano on Earth is encircled by a comparable population mass. The Mexico City (21M), Puebla (3.2M), and Toluca (2.1M) metropolitan areas form a continuous urban belt around Popocatépetl. This demographic reality means that even minor escalations trigger large-scale civil response requirements, compounding aviation disruption with surface transportation and logistics impacts that further stress passenger handling at MMMX.
All three carriers operate MMMX as a primary hub or major focus city. The absence of pre-positioned volcanic contingency procedures — standby aircraft, pre-approved reroutes, proactive passenger communication triggered by VAAC advisory issuance rather than by airport closure — meant that each cancellation was reactive, amplifying passenger disruption relative to what structured early-warning protocols could have achieved.
Takeaway
Popocatépetl is not a black-swan risk. It is a permanent, documented, continuously monitored volcanic hazard that has been erupting since at least 1354 and which sits 70 km from one of the world's busiest airports serving a 21-million-person metropolitan area. The February 2024 episode is therefore not a story about an unpredictable geological event — it is a story about the structural gap between available geophysical data and operational aviation decision-making.
The 13-explosion sequence was preceded by weeks of elevated activity signals, increasing VAAC advisory frequency, and measurable precursor indicators in CENAPRED bulletin language and satellite SO₂ data. A system designed to synthesise these streams and translate them into probabilistic operational risk scores may have delivered actionable intelligence well before the SIGMET system — which is designed to document hazards that already exist in the atmosphere, not to predict them — generated its first advisory for the critical window.
The rapid-fire explosion tempo — averaging one event per 110 minutes — also exposed the inadequacy of reactive SIGMET-monitoring as a primary decision tool. Each new explosion refreshed the ash hazard before the previous advisory polygon had fully cleared. Airlines whose dispatch protocols are triggered by SIGMET issuance rather than by upstream volcanic risk scoring were structurally unable to get ahead of the disruption curve. The 22 cancellations were a consequence of this reactive posture, not of geological unpredictability.
For fleet operators with significant MMMX exposure — particularly those with high-frequency domestic trunk routes that have limited rerouting flexibility — Popocatépetl represents a recurring, quantifiable operational risk factor that belongs in route planning models, not just in OCC crisis response checklists. The volcano's baseline alert level of Amarillo Fase 2 has been in place across multiple eruption cycles. It should be treated as a persistent elevated-risk environment, not as a stable background condition.
This retrospective analysis examines signals present in public data before the event. It is provided for educational context only and does not claim predictive capability for future events.
A retrospective analysis suggests FlySafe's indices may have indicated FL350–FL380 as high-probability contamination altitudes on northwest-tracking SIDs — the exact profile used by outbound traffic from MMMX toward northern Mexico and the United States. The system may have maintained real-time SIGMET polygon integration throughout the 24-hour window, giving operations teams a single fused operational picture rather than requiring manual correlation of VAAC advisories, CENAPRED bulletins, DGAC NOTAMs, and airline OCC feeds.
Persistent alert level masking: Amarillo Fase 2 has been the baseline for extended periods, normalising operator attention to a level that still represents active volcanic hazard. Static alert levels require dynamic overlays to remain operationally meaningful.
MMMX has no geological alternative: Unlike European hubs during the 2010 Eyjafjallajökull crisis, there is no realistic mass-diversion airport serving Mexico City's demand base. When MMMX partially closes, the system fails — making early warning commercially critical, not merely operationally convenient.
Multi-eruption sequencing risk: 13 explosions in 24 hours means a continuous refresh of the hazard environment. Decision models built on single-event SIGMET logic are structurally inadequate for rapid-fire eruption sequences. Probabilistic multi-event modelling is required.
Population density amplifies consequence: With 25+ million people within 100 km, any civil protection escalation — school closures, road restrictions, emergency declarations — materially degrades ground handling and passenger processing capacity at MMMX independent of the airspace situation, compounding the aviation impact of each volcanic event.
Sources
- CENAPRED — Popocatépetl Daily Bulletins, February 2024. Centro Nacional de Prevención de Desastres, Secretaría de Seguridad y Protección Ciudadana, Mexico.
- Washington VAAC — Volcanic Ash Advisories for Popocatépetl, February 18–20 2024. National Weather Service Aviation Weather Center, Washington Volcanic Ash Advisory Centre.
- Mexico DGAC — NOTAM Archive MMMX (Aeropuerto Internacional Benito Juárez), February 2024. Dirección General de Aeronáutica Civil, Secretaría de Infraestructura, Comunicaciones y Transportes.
- Volaris — Flight status and operational updates, February 18–19 2024. Controladora Vuela Compañía de Aviación, S.A.B. de C.V.
- Associated Press — "Mexico's Popocatépetl volcano erupts repeatedly, forcing flight cancellations." February 2024.
This is a retrospective analysis of publicly documented events. FlySafe's prediction system was not operational during this event. All information is sourced from public records, aviation authority publications, airline statements, and open data.