About the Data

About the Project

Terms and Conditions

WebGIS Tutorial

CDHW_1 represents the maximum magnitude of compound heatwave and 1-month drought events in a year. A compound event is detected when heatwave days are included in a month experiencing short-term drought, i.e., with SPEI1 &#x3C; -1. The compound magnitude for each drought-heatwave event is described by multiplying the heatwave magnitude (HWM) normalized by the heatwave duration times the absolute value of SPEI1 in the corresponding month.
A heatwave event corresponds to a period of at least three consecutive days with maximum daily temperature exceeding the 95th percentile of all daily maximum temperatures recorded during the reference period (1991-2020).
SPEI1 gives a measure of the surface water balance (i.e., the difference between precipitation and potential evapotranspiration) over a period of one month relative to the long-term average. SPEI1 values around 0 indicate normal conditions, while values below -1 indicate deficit conditions (e.g., -1 corresponds to a deficit of one standard deviation).
SPEI1 values for the current period are derived from the daily SPEI dataset produced by the (<a href="https://www.alpine-space.eu/project/ado/">ADO project</a>) adopting 1981-2020 as calibration period and Penman-Monteith equation for the potential evapotranspiration calculation. The monthly SPEI1 values are derived by retaining the last SPEI1 entry of each month. To ensure consistency, maximum temperature used for calculating the heatwave magnitude in the historical period was retrieved from the same ADO dataset. For future projections, the potential evapotranspiration used for SPEI calculation is estimated from minimum and maximum temperature based on the Hargreaves equation, while the calibration period is based on GWL 0.61 °C. Further details on data and SPEI calculation are available in “About the data”. Unit: °C

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Alpine Space report

Glossary

WebGIS index description

Pilot reports

Eleanor [6.0 MB]

Garmisch [4.1 MB]

Gorenjska (drought) [8.1 MB]

Gorenjska (floods) [11 MB]

Vaia storm [7.5 MB]

Wipptal Stubaital [6.0 MB]

CDHW_1 - Magnitude of compound one-month drought and heatwave events i

Historical 1991-2020

▦ PNG image

▦ NetCDF grid

◍ NUTS3 aggregates