| Heatwaves and potential heatwaves (Official: '91-'20 thresholds) at end of 26th April 2025 (0 reports). | ||
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Data courtesy of MetOffice and OGIMET This map shows the number of consecutive heatwave days from official sites up to the selected date, combining data from non-QC'd SYNOPs and the Met Office's QC'd MIDAS database. An official heatwave day is defined as any single day where the maximum temperature exceeds the heatwave threshold for the relevant county, whilst an offical heatwave is 3 or more (UK) / 5 or more (Ireland) consecutive days of the same. The heatwave thresholds for each county, and more information can be found here - What is a heatwave? (Met Office). The threshold for Ireland is 25°C countrywide. The threshold for each site can also be seen in the brackets next to each site in the table, as well as in the pop-up which can be found by clicking each individual icon on the map. The maximum temperature on the selected date can also be found in this pop-up. Heatwaves can also be defined by the anomaly with respect to climate - the official Met Office definition ultimately stems from this but is truncated at 25degC even for areas with relatively cold climates. You can select to display heatwaves based on an anomaly of 5, 8, or 10 degC above the long-term daily mean, calculated using all available data for each site and a 7-day window centred on the date in question. The climate you compare to can also be selected, either the latest ('91-'20) at all times, in order to see the effect of climate change on heatwave magnitude/extent by this definition, or the contemporary climate. If you select the latter, the climate which is used (earliest climate period available is 1951-1980) is shown in the title bar of the display. Data is available back to 1853, to the present day. All times quoted are GMT. Page load and execution time: 0.1 seconds. |