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A heat index of 45C would mean a 38C air temp with 38% humidity.
Possible I'm right then... At least for London... In August 10th 2003 temps reached 38 and it was quite humid because there where thunderstorms around and it became overcast at the hottest part of the day... So 38C and 50% humidity would feel like 51 degrees...
In Spain it was around 42C with probably about the same humidity - so that makes temps feel like 59 degrees... So that's the highest I've probably felt in terms of Humidex http://www.eurometeo.com/english/read/doc_heat
On London's hottest day on record, they had RH% and dew points so low that they didn't even produce a heat index
Yeah, exactly what I was thinking about. It didn't. And I looked at Portsmouth Solent and in July/August 2003 and 2006 they barely hit 30C a couple of times.
On London's hottest day on record, they had RH% and dew points so low that they didn't even produce a heat index
There was still humidity, not in that, I don't really trust websites such as Weather Underground or AccuWeather as they get the records and averages wrong...
Heat indexes don't really mean much to me, but one day that I recall as having unusually humid heat when I lived in London compared to what I'm used to was 27 June 2011. Heat index only just scraped over 30 though, so it was nothing compared to a lot of the US ones. I honestly can't relate to a lot of the descriptions of humid heat I read on here every summer. It was still hot enough that afternoon that nobody did any meaningful work in our un-airconditioned office though.
And is wunderground wrong for Heathrow's temperature on that given day?
Yes, it says 37C, when it was 38.1C...
Then you have AccuWeather which claims Portsmouth receives an average high of 19C in July, when it's 21.8C on the seafront (like a degree higher only a few yards inland in the actual city center!)! When it comes to averages I go with the Met Office. In terms of extremes, I do wish the Met Office gave us more information on that...
Still, they would have to be totally off in the dew point and RH levels on that day to produce any sort of heat index.
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Then you have AccuWeather which claims Portsmouth receives an average high of 19C in July, when it's 21.8C on the seafront! When it comes to averages I go with the Met Office. In terms of extremes, I do wish the Met Office gave us more information on that...
I wonder if that French site has hourly data for Heathrow on August 10th?
Still, they would have to be totally off in the dew point and RH levels on that day to produce any sort of heat index.
I wonder if that French site has hourly data for Heathrow on August 10th?
Yes, but later on they found that Heathrow reached 38.1C.
Maybe, but those frogs may be biased...
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