Understanding the Difference Between a Warm Spell and a Heatwave in Ireland
When does a warm spell become a heatwave?
Image: The Irish Times
Temperatures in Ireland are expected to rise significantly over the coming days, transitioning from a cold May to a warm spell, but not qualifying as a heatwave. Met Éireann defines a heatwave as five consecutive days of temperatures exceeding 25 degrees Celsius, a threshold likely not to be met this week.
- 01Met Éireann defines a heatwave as five or more consecutive days of temperatures at or above 25 degrees Celsius at a single weather station.
- 02The current weather pattern is classified as a 'warm spell' rather than a heatwave, with temperatures expected to peak around 25 degrees Celsius.
- 03The warm spell is anticipated to last through the first half of the week, but uncertainty increases later in the week.
- 04Ireland last experienced a heatwave in September 2023, and the upcoming warm spell will not meet the criteria for a heatwave.
- 05Other regions, including parts of Britain and southern Europe, are expected to experience temperatures exceeding 30 degrees Celsius.
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Ireland is set to experience a significant rise in temperatures after an unusually cold May, with a warm spell expected to last through the first half of the upcoming week. Met Éireann, the national meteorological service, describes this weather pattern as a 'warm spell' rather than a heatwave, which requires five consecutive days of temperatures at or above 25 degrees Celsius at a single location. While some areas may see temperatures reach or exceed 25 degrees starting Monday, the forecast indicates that the warmest conditions will likely be concentrated in Leinster. The last heatwave in Ireland occurred in September 2023, and with just over a week until June, the likelihood of a heatwave this spring remains low. In contrast, parts of Britain are expected to enter official heatwave territory, with thresholds of three consecutive days exceeding 25 degrees in Scotland and Northern Ireland, and 28 degrees in London. Additionally, countries like France, Spain, and Portugal are forecasted to experience temperatures surpassing 30 degrees. Met Éireann attributes the increasing frequency and intensity of heatwaves globally to human-caused climate change.
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The warm spell may lead to increased outdoor activities and energy consumption, but without reaching heatwave conditions, public health risks remain lower.
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