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Extreme Heat - Anomaly, Historical, Baseline, Global (v1.0)


This is a static historical dataset for global land areas capturing the near-historical risk from extreme heat anomalies over a 30 year period using the daily mean heat index.

heat, global, thermal, hazard, risk, stress, historical, temperature, heat index, anomaly
Temporal Extent:
1992-01-01 to 2022-01-01
11 km
Product Version:

Technical Description

The Extreme Heat - Historical Risk, Anomaly product provides valuable insights into the frequency of extreme heat observations across the globe in a 30-year time period from 1992-2021. This product seek to identify global areas where heat conditions may have presented risks to human health, agriculture, water resources, and wildlife.

The product's extreme_heat_anomaly_frequency field detects locations experiencing moderately high temperatures that were concurrently above the normal conditions for that area. It considers regional acclimatization and ensures an absolute baseline for classifying extreme heat events.

This dataset contains the following fields:

  • extreme_heat_anomaly_frequency: Frequency of extreme heat occurrence at pixel locations over the baseline time period where the mean daily heat index is above the US NWS "Caution" threshold (>80°F, > 26.7°C) AND above the 95th baseline percentile heat index value for that location. For instance, a value of 0.5 would indicate that half of the days were under anomalous extreme heat conditions for that location. This is a value between 0.0 and 1.0.
  • extreme_heat_anomaly_risk_class: The extreme heat anomaly risk classification for each value. Values are integers from 1 to 5 representing the following classes: Very Low Risk (1), Low Risk (2), Moderate Risk (3), High Risk (4), and Very High Risk (5). Values are categorized using the 44th, 67th, 84th, and 94th percentiles of the extreme_heat_anomaly_frequency field, exclusive of '0' values.