UK: New record as temperature hits 39.1C - with 41C expected this afternoon

[Kieppie]

The least affected places will be on the coast adjacent to cold ocean currents, due to the large thermal inertia of the sea. The largest effects will be continental climates in far northern latitudes, such as Siberia.

The Western Cape says hello...

The advantage being that for those areas that are most affected it would be beneficial if they have an increase of that magnitude. Considering the land mass they occupy and the potential increased agriculture yield

 

[Gnome]

I went to South India in the summer, 42C 100% humidity, the air feels so thick and heavy you almost feel like you can swim through it.

The only time I felt like I was going to pass out was on a bus passing past a horrific smelling river.

If that was true you would have died.
You can't survive very long above 35c in 100% humidity.

All mammals regulate body temperature through evaporation, humans need to stay at around 37c.
Above 35c at 100% humidity it becomes impossible for sweat to evaporate at a sufficient rate to cool your body under any circumstance.
So your body is unable to reduce its temperature and you die very quickly

That is why that graph says extreme danger for 32c at 100% humidity and doesn't bother going above that.

 

[Quicks]

So are we going to have a hot summer in SA. Last summer was a bit cool and rainy. Hope the ANC planned for the drought seems to come around every 4 - 5 years.

 

[backstreetboy]

View attachment 1349648

Use a manual aircon.

 

[Drifter]

It's only around 40 Deg C. What is the issue here?

 

[Polymathic]

If that was true you would have died.
You can't survive very long above 35c in 100% humidity.

All mammals regulate body temperature through evaporation, humans need to stay at around 37c.
Above 35c at 100% humidity it becomes impossible for sweat to evaporate at a sufficient rate to cool your body under any circumstance.
So your body is unable to reduce its temperature and you die very quickly

That is why that graph says extreme danger for 32c at 100% humidity and doesn't bother going above that.

Strange how people can survive in the tropics then or maybe some weather reports round up anything over 95% as 100% ..

 

[The Voice]

Difficult to explain, but other Saffas here can probably confirm that high temps here just feel way hotter than they do back in SA. Down to it being an island that’s designed to retain as much heat as possible.

Thankfully that spell is over. Much cooler today.

 

[Gnome]

Strange how people can survive in the tropics then or maybe some weather reports round up anything over 95% as 100% ..

Well you can google it for yourself.
The wet-bulb (100% relative humidity) absolute max temperature is considered 35c for human survival.
Each degree above that means dying just a bit quicker.

100% humidity above 35c has been recorded in the past but it is extremely rare is my understanding.
Where do you see that happening regularly?

 

[Pak Fa Fui]

Well you can google it for yourself.
The wet-bulb (100% relative humidity) absolute max temperature is considered 35c for human survival.
Each degree above that means dying just a bit quicker.

100% humidity above 35c has been recorded in the past but it is extremely rare is my understanding.
Where do you see that happening regularly?

It was only 17^% humidity yesterday

 

[Gnome]

It was only 17^% humidity yesterday

Yes, this was not about the temperature yesterday.
Check the post I quoted before, poster claims he survived 42c at 100% humidity (Which I can believe for a very short time, but this didn't sound like a short amount of time)

 

[Polymathic]

Well you can google it for yourself.
The wet-bulb (100% relative humidity) absolute max temperature is considered 35c for human survival.
Each degree above that means dying just a bit quicker.

100% humidity above 35c has been recorded in the past but it is extremely rare is my understanding.
Where do you see that happening regularly?

Heard from people

 

[Gordon_R]

Heard from people

That is a common misconception, and inconsistent with the laws of physics. The relative humidity (RH) is highest at dawn (close to 100%), and decreases as the temperature increases (roughly 70% for each 10C rise).

Also note that if the dew point was 35C, then moisture in the air would condense on the sea surface, which very rarely exceeds 27C. The fact is that this scenario never happens, and dew point in the atmosphere is almost always below 27C (except during tropical storms).

 

[Gordon_R]

UK fire brigades are very busy:

London Fire Brigade had busiest day since World War Two, says London mayor

Fifteen areas across the UK declared major incidents as wildfires broke out after unprecedented heat.

www.bbc.com

Mr Khan said London Fire Brigade (LFB) received 2,600 calls as it dealt with multiple fires. He earlier told Sky News 41 properties were destroyed in London on Tuesday.

In Wennington, east London, 100 firefighters tackled a blaze which destroyed several homes.

LFB said two rows of terraced houses, four other homes, 12 stables and five cars were destroyed by the blaze, while one firefighter at the scene described it as "absolute hell".

"Normally we get 350 calls a day, on a busy day we can get up to 500 calls. Yesterday the fire service had more than 2,600 calls a day."

 

[Sinbad]

UK fire brigades are very busy:

London Fire Brigade had busiest day since World War Two, says London mayor

Fifteen areas across the UK declared major incidents as wildfires broke out after unprecedented heat.

www.bbc.com

What blew me away was they had 90 engines deployed.
Joburg has 11. And I'm pretty sure not all of those work.

 

[Temujin]

UK fire brigades are very busy:

London Fire Brigade had busiest day since World War Two, says London mayor

Fifteen areas across the UK declared major incidents as wildfires broke out after unprecedented heat.

www.bbc.com

Arsonists having the time of their lives

 

[dualmeister]

Arsonists having the time of their lives

Unless things magically spontaneously combust once they reach 40'C

 

[Sinbad]

Unless things magically spontaneously combust once they reach 40'C

Apparently one of the fires was caused by a compost heap overheating and spontaneously combusting ...

 

[Kieppie]

Apparently one of the fires was caused by a compost heap overheating and spontaneously combusting ...

Actually that's not that strange. They already easily reach high temperatures and you have to keep it lower by turning it regularly as to not kill of the microbes.
So if it was mostly dry grass clippings and given the recent high temperatures this is understandable.

 

[gregmcc]

Imagine wearing this in the heat. Poor dudes. They have to stand for hours.

 

[gregmcc]

Difficult to explain, but other Saffas here can probably confirm that high temps here just feel way hotter than they do back in SA. Down to it being an island that’s designed to retain as much heat as possible.

Thankfully that spell is over. Much cooler today.

100% correct. Back in SA I used to go cycling in 32C weather. No issues. Even 35 didn't feel that hot.

Over here anything above 30 is seriously uncomfortable and you feel like you are going to pass out.
I'm going back to SA on holiday in 2 weeks so can compare the current CT 17C to the when it's 17 in UK (Which is shorts and tshirt weather)