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Partly live.Values marked LIVE come from NOAA, the Bureau of Meteorology, Copernicus (ERA5) and NASA, each with its date and source. Anything marked FIXTURE — including demo events — is still a placeholder.Sources

Extreme heatHistoricalFixture: Development placeholder. Not a real measurement.

Demo Extreme Heat Event

1 Jan 2026 – 7 Jan 2026Demo Region

Fixture content for frontend development only. It shows how an event page explains a heatwave: what happened, why, how unusual it was, and where the numbers come from.

Explore the data

This is a development fixture, not a real event. Its structure shows how an event page will read once real data is connected.

Loading map…

Basemap and satellite base only — no anomaly field is drawn for a demo event.

2 m temperature anomaly (°C)

  1. -6
  2. -4
  3. -2
  4. 0
  5. +2
  6. +4
  7. +6

Event at a glance

Event type
Extreme heat
Dates
1 Jan 2026 – 7 Jan 2026
Regions
Demo Region
Duration
7 days
Status
Historical
Countries
Demo Country
Fixture: Development placeholder. Not a real measurement.

Overview

In plain language

Fixture content for frontend development only. It shows how an event page explains a heatwave: what happened, why, how unusual it was, and where the numbers come from.

Scientific summary

Do not display as factual production content. In a real entry this paragraph summarises the synoptic setup, the observed anomalies relative to a stated baseline, and the attribution evidence if any exists.

Timeline

How did the event develop?

  1. 1 Jan – 2 Jan

    Onset

    High pressure builds; temperatures begin rising above the seasonal norm.

  2. 3 Jan – 4 Jan

    Intensification

    The ridge becomes stationary and subsidence clears the skies.

  3. 5 Jan – 6 Jan

    PeakPeak

    Largest anomalies of the episode; dry soils amplify surface heating.

  4. 7 Jan

    Decline

    The block breaks down and a cooler air mass arrives.

Key metrics

How big and how unusual was it?

Mean temperature anomaly

Fixture: Development placeholder. Not a real measurement.

+4.0 °C

Area-average over the event region.

Why?

Reference period: 1991-2020 · Reanalysis

Highest temperature

Fixture: Development placeholder. Not a real measurement.

40.0 °C

Single-station maximum.

Why?

Observation

Duration

Fixture: Development placeholder. Not a real measurement.

7 days

Days above the 90th-percentile threshold.

Percentile

Fixture: Development placeholder. Not a real measurement.

99th percentile

Why?

Reference period: 1991-2020 · Reanalysis

Spatial analysis

Where was it unusual?

Loading map…

Unavailable: No data source is connected for this value yet.Anomaly field not connected

The basemap shows the event region only. The anomaly layer will come from a reanalysis dataset once its access and licence are verified.

2 m temperature anomaly (°C)

  1. -6
  2. -4
  3. -2
  4. 0
  5. +2
  6. +4
  7. +6

Time series

How did the anomaly evolve day by day?

Daily temperature anomaly

Variable: 2 m air temperature anomaly · Unit: °C · Period: 1 Jan 2026 – 21 Jan 2026 · Baseline: 1991-2020

Fixture: Development placeholder. Not a real measurement.
Daily temperature anomaly — Demo Extreme Heat Event-0.200.20.40.60.8°C1 Jan3 Jan5 Jan7 Jan9 Jan11 Jan13 Jan15 Jan17 Jan19 Jan21 Jan
Event-region daily anomalyReference (0 = 1991–2020 mean)
Daily temperature anomaly — Demo Extreme Heat Event
TimeEvent-region daily anomalyReference (0 = 1991–2020 mean)
2026-01-010.40.0
2026-01-020.50.0
2026-01-030.80.0
2026-01-040.60.0
2026-01-050.30.0
2026-01-060.20.0
2026-01-070.40.0
2026-01-080.30.0
2026-01-090.20.0
2026-01-100.50.0
2026-01-110.30.0
2026-01-120.40.0
2026-01-130.40.0
2026-01-140.20.0
2026-01-150.30.0
2026-01-16-0.10.0
2026-01-170.20.0
2026-01-180.60.0
2026-01-190.40.0
2026-01-200.50.0
2026-01-210.00.0

Synthetic series for interface development — not data.

Source: ECMWF / Copernicus C3S · ERA5ReanalysisUpdated: —Methodology

Atmospheric drivers

Why did it happen? Each step causes the next.

  1. 01

    Blocking high

    A persistent high-pressure system stalls and diverts weather systems around it.

  2. 02

    Subsidence

    Air sinks inside the high, warming by compression and suppressing cloud.

  3. 03

    Clear skies

    Less cloud means more solar radiation reaches the surface.

  4. 04

    Soil moisture deficit

    Dry soils evaporate less, so more energy goes into heating the air.

  5. 05

    Extreme heat

    The combination sustains temperatures far above the seasonal norm.

Impacts

Why does it matter? Meteorological effects are kept apart from socioeconomic estimates, which come from other bodies and other methods.

  • Water resources

    Meteorological

    Elevated evaporation and reduced river flow.

    Fixture: Development placeholder. Not a real measurement.

  • Human health

    Socioeconomic

    Heat-health impacts are estimated by public-health agencies, usually months later.

    Fixture: Development placeholder. Not a real measurement.

  • Agriculture

    Socioeconomic

    Crop stress where heat coincides with flowering.

    Fixture: Development placeholder. Not a real measurement.

  • Energy

    Socioeconomic

    Higher cooling demand on the power grid.

    Fixture: Development placeholder. Not a real measurement.

Methodology

How the numbers on this page are produced.

Anomalies are computed against the 1991–2020 climatology of the same dataset and calendar period. Percentiles are ranked within that reference distribution. Area averages are weighted by grid-cell area. Impact figures are reported as published by their source and are never modelled on this site.

Read the full methodology