SevereEnded

Disruption index anomaly in Croatia

🇭🇷 Croatia

Onset: 2026-09 · First detected: 2026-09-14T12:39:56.623261+00:00 · Last observed: 2026-10-05T12:01:02.624765+00:00 · Ended: 2026-10-05T12:23:47.604012+00:00

Generated at: 2026-10-29T12:01:57.650204+00:00 · The radar runs every 6 hours; data may lag by up to 6 hours.

Plain-language brief

What happened, who is affected, what similar past episodes looked like and what to do — every number links to its source.

What happened

ObservedIn 2026-09, the combined disruption picture for Croatia moved well outside its usual range — rated severe — the highest of our three alert levels.[Composite Disruption Index (monthly methodology)]
ObservedThe reading behind this alert: index at 59.6 (the full technical detail is in the sections below).[Composite Disruption Index (monthly methodology)]

Who is affected

ObservedHotels, travel managers, OTAs and tour operators with guests in Croatia during the event window are the most directly affected, together with travellers holding bookings there.[Composite Disruption Index (monthly methodology)]

What similar past episodes looked like

Historical associationIn similar past high-disruption months, overnight stays in Croatia averaged 21.9% below normal calm-month levels — a historical association from our published research panel, not a prediction.[estimates.historical_correlation]
Historical associationLooking at the 3 most similar months in our 2014-2026 research panel, overnight stays one month later differed from a year earlier by a median of +2.3% — again a historical association, not a prediction of this event.[estimates.analogues]

What to do now

RecommendationFor now, keep an eye on the situation in Croatia; no change to bookings is needed yet.[detection.observed]
RecommendationLet affected Croatia bookings move to new dates without penalty while the disruption lasts.[detection.observed][estimates.historical_correlation]

Impact

index	59.56
components	{"aviation":0,"disaster":49.99,"health":0,"rail":null,"weather":75}

Historical monthly context — not current conditionsAs of: 2026-10 · Disruption index: 29.96 · 0 months older than this event

How this was detected

Rule: monthly_index_anomaly

Method: deterministic-rule

Thresholds

index_watch	25
index_severe	50
z_min	2
z_floor_index	10

Observed

month	2026-09
disruption_index	59.56
components	{"aviation":0,"disaster":49.99,"health":0,"rail":null,"weather":75}

Baseline

n_points	103
window_hours	—
mean	32.09
std	24.66

Insufficient baseline — absolute threshold only.

Sources

Composite Disruption Index (monthly methodology)snapshotcollected: 2026-10-26

Corroborating evidence

Corroboration not applicable: live snapshots describe current conditions, not the period of this event.

Estimates

Estimates are labeled model outputs derived from published historical artifacts — they are context, not forecasts.

Model output — historical correlation estimatehistorical-correlation

r_nights	0.48
r_arrivals	0.45
best_lag_months	0
best_lag_r	0.48
baseline_deviation_pct	-21.85
n_months	140

Caveats:

correlation is association, not causation
baseline_deviation_pct is the observed average nights deviation during historical high-disruption months (index > 50) vs calm months
coefficients are dominated by the 2020-2021 pandemic period and may overstate the impact of smaller disruptions
computed on monthly national aggregates; sub-national and short-lived events are diluted

Observed history — analogue episodes, not a predictionanalogue-episodesindex_equiv = 60

Episode	score	index	h0	h1	h2	h3
🇫🇷 France · 2025-08	2.017	91.05	1.18	1.93	4.24	-2.99
🇫🇷 France · 2026-08	2.004	87.57	-1.83	—	—	—
🇫🇷 France · 2018-08	1.988	81.13	1.63	2.63	3.30	3.28

median_h1	2.28
median_h2	3.77
median_h3	0.14

Caveats:

analogues are historically similar months, not a forecast of this event
similarity is computed on a 10-feature panel embedding (tourism volumes, disruption/stringency indices, seasonality); it ignores event semantics
the index_equiv mapping from severity to disruption-index points is a disclosed modelling assumption, not an observation
observed_nights_yoy_pct mixes the event effect with everything else that happened in those months

Recommendations

Monitor the situation in Croatia and re-check this report before confirming new bookings.
based on: detection.observed
Enable flexible rebooking for trips to Croatia departing within {days} days.
based on: detection.observed, estimates.historical_correlation

For AI agents

Machine-readable JSON for this page:

/data/api/v1/events/ev-monthly-anomaly-hr-20260901-e72d26.json

Add as an MCP server (from the repo root):

claude mcp add travel-trends -- .venv/bin/python -m etl.mcp_server

API documentation →