100% Humidity In Sunderland

albert · 4 Aug 2012 at 23:09

It is SO warm in Sunderland tonight. It's only 15 degrees but the humidity is 100% and i'm sweating buckets. Strange weather.

.... or am i coming down with a fever?

pingwing · 4 Aug 2012 at 23:13

Fever. 100% that.

100% humidity is a statistical impossibility. It's Sunderland. Next you'll be telling me it's so warm in Sunderland ice-cream melts in your hand....

Mike UK · 4 Aug 2012 at 23:13

It cant be that bad in Sunderland!

Spoken with friends there and they havent said the weather is out of the ordinary (probably cold and raining!)

Pawnless Endgame · 4 Aug 2012 at 23:14

That's why I hate August. Not particularly sunny weather, but the humidity always goes through the roof in this month. Give me that Indian summer from last Sep/Oct any day. 100% sun, hot, but without the humidity.

albert · 4 Aug 2012 at 23:18

pingwing said:
Fever. 100% that.

100% humidity is a statistical impossibility. It's Sunderland. Next you'll be telling me it's so warm in Sunderland ice-cream melts in your hand....

well my barometer is saying 100% and even the bbc weather site is saying 97-98% humidity. It's damm uncomfortable

Chris [BEANS] · 4 Aug 2012 at 23:27

I obviously don't understand what 100% humidity means?! Shouldn't that be underwater??! :eek:

malfunkshun · 4 Aug 2012 at 23:30

Chris [BEANS];22495484 said:
I obviously don't understand what 100% humidity means?! Shouldn't that be underwater??!

nah it is relative humidity

Spenty · 4 Aug 2012 at 23:31

Doesn't feel all that warm to me. Try moving from the basement?

Castiel · 4 Aug 2012 at 23:33

Chris [BEANS];22495484 said:
I obviously don't understand what 100% humidity means?! Shouldn't that be underwater??!

No, it is relative humidity:

For example, if the air temperature is 24 °C (75 °F) and the relative humidity is zero percent, then the air temperature feels like 21 °C (69 °F). If the relative humidity is 100 percent at the same air temperature, then it feels like 27 °C (80 °F). In other words, if the air is 24 °C (75 °F) and contains saturated water vapor, then the human body cools itself at the same rate as it would if it were 27 °C (80 °F) and dry. The heat index and the humidex are indexes that reflect the combined effect of temperature and humidity on the cooling effect of the atmosphere on the human body.

Chris [BEANS] · 4 Aug 2012 at 23:48

Castiel said:
No, it is relative humidity:

Much clearer

pingwing · 5 Aug 2012 at 00:01

albert said:
well my barometer is saying 100% and even the bbc weather site is saying 97-98% humidity. It's damm uncomfortable

mother of god! We're all doomed!

Kosmiche · 5 Aug 2012 at 00:55

Hate it when it gets like this, opening a window doesn't help as there is no breeze.

Can't sleep so I watch some crap on Dave.

D.P. · 5 Aug 2012 at 05:56

Chris [BEANS];22495484 said:
I obviously don't understand what 100% humidity means?! Shouldn't that be underwater??!

No, 100% humidity means the air is completely saturated and cannot do any more water vapor.

D.P. · 5 Aug 2012 at 05:58

Hit almost 40 degrees here ( Oregon), not p bd with low humidity but clouds covered the sky as the sunset sot it is like n oven right now.

Mucky_Pup · 5 Aug 2012 at 07:20

pingwing said:
mother of god! We're all doomed!

It's alright, it's only Sunderland, if you've ever been there you'd see that it wouldn't be such a bad idea if their ranks were thinned out a little.

Cosimo · 5 Aug 2012 at 09:02

Just think, you won't need a shower this morning.

Deleted member 77746 · 5 Aug 2012 at 09:22

It's warm when you are in a loft putting ethernet points in!

Chris [BEANS] · 5 Aug 2012 at 09:43

Castiel said:
No, it is relative humidity:

D.P. said:
No, 100% humidity means the air is completely saturated and cannot do any more water vapor.

OK, I appreciate I'm wrong, but I just don't know why I'm wrong.

If I run a shower, the air becomes thick with water vapour and it condenses on cold (relatively speaking) surfaces.

So, assuming it's not like that in Sunderland right now, then the air can surely take considerably more water vapour and therefore can't currently be at 100% humidity??

Again, I KNOW I'm wrong, I'm not arguing my point, I'm explaining that I simply don't get it and I don't like being ignorant!!

BDEE · 5 Aug 2012 at 10:17

Did you not have the electrical storm in Sunderland last night?

Had an epic one in Bishop - Wiped out the sub station and had no leccy from 20:15 yesterday until 20 mins ago - They have had to bring in generators to power the village I live in, so must be serious damage.

malfunkshun · 5 Aug 2012 at 10:37

Chris [BEANS];22496632 said:
OK, I appreciate I'm wrong, but I just don't know why I'm wrong.

If I run a shower, the air becomes thick with water vapour and it condenses on cold (relatively speaking) surfaces.

So, assuming it's not like that in Sunderland right now, then the air can surely take considerably more water vapour and therefore can't currently be at 100% humidity??

Again, I KNOW I'm wrong, I'm not arguing my point, I'm explaining that I simply don't get it and I don't like being ignorant!!

Complicated

Relative humidity is the partial pressure of water vapour (partial pressure is the pressure that said water would exert if everything else was removed) to the vapour pressure at a given temperature.
Because this is relative humidity 100% does not mean that the atmosphere is composed of just water.
100% relative humidity at 20c will generally equate to about 15grams of water in 1kg of air. If you reduce that to 10c then it would be about 7.5g/kg.
So if it was 20c and 50% all day then the temperature suddenly dropped to 10C the humidity would become 100% because the air already holds the maximum amount of water for that temperature (this doesnt really happen like that as temperature changes are generally gradual and the since at 100% relative humidity the water will have to condense out (dew/fog).
That is a hugely simplified overview, I understand the basic principals but because weather systems are continually moving and changing certain elements are lost on me.