#ClimateDiary Thinking about the word #Heatwave. Is it helpful? Yes, of course, it captures that it is unusually hot. And when people talk about this year’s heatwave many do bring in climate change. But the word itself makes jt sound like something natural that just happens, like a wave, just washes over us. Not sure it’s that helpful.

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in reply to Pauline von Hellermann

Heattsunami? Not really much better I guess.

The whole nautical/water aspect is perhaps not so useful...

In Denmark, the definition is apparently 3 consecutive days with temperature above 28 °C

This seems to not be consistent throughout Europe though.

da.wikipedia.org/wiki/Hedeb%C3…

So, even when discussing if the word heatwave is appropriate, we don't even seem to have a firm consensus of what heatwave means, leaving room for a shifting definition across decades.

Difficult!

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in reply to Vicomte Folmer af Helvede

and although the Wikipedia article cited divides the UK between North and South its not that simple: there are actually 4 zones (25C, 26C, 27C and 28C) and here in the far South West we are in the zone with the lowest heatwave threshold. - it's really South East vs. the rest. Apparently Londoners are used to being baked.

weather.metoffice.gov.uk/learn…

in reply to MarjorieR

@marjolica
That's interesting, thanks!

I clicked through to the 2022 threshold update, with a very nice and detailed description of the updates regarding which temperature is used in the counties.

So even the heatwave definition is being changed, so historical records will sound worse than they are, if one doesn't take that into account.

Especially the attached graphic from that article (metoffice.gov.uk/about-us/news…) is really quite informative.

Cc
@pvonhellermannn

in reply to Vicomte Folmer af Helvede

@folfdk what ths doesn't mention is humidity. Where we are (South West UK, coastal) the humidity is typically 80%+ overnight, albeit we get more wind.
I don't know if this is factored into the UK Met Office classifications, I think they are just using a simply a deviation from historical "norms" not the degree to which the temperature affects human bodies.
in reply to Pauline von Hellermann

After a discussion last week about naming storms, I wrote to the UK Met Office suggesting that we start naming heatwaves, similar to the way we name storms.
I got this reply

Thank you for your email and for sharing your suggestion.

We appreciate your idea of assigning names to significant heat events in a similar way to our named storm system. The Met Office currently names storms as part of a joint initiative with Met Éireann and KNMI to help communicate the potential impacts of high-impact weather. Heatwaves are communicated through forecasts, weather warnings where appropriate, and Heat-Health Alerts issued by the UK Health Security Agency and Met Office.
We value public feedback on how weather information is communicated and have passed your suggestion to the relevant team for consideration.
Thank you for taking the time to contact us.

Kind regards,
Service Desk

#NamedStorms #NamedHeatwaves #UKMetOffice #MetÉireann #KNMI

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