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99% humidity?

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Ari

Original Poster:

12,320 posts

120 months

Wednesday 27th June 2012
quotequote all
Just noticed on the weather forecast that it's projected to be 99% humidity tonight.

Hope they've not underestimated as surely 100% humidity is pure water and we'll all drown!?

driverrob

4,015 posts

108 months

Wednesday 27th June 2012
quotequote all
No. % humidity is relative to the amount (proportion) of water vapour that can exist in equilibrium with air at a particular temperature.
e.g. in winter it might be 80% humidity at mid-day but, at much lower temperatures at night, that same amount of water vapour would exceed 100% so there will be condensation - mist/dew or hoar frost if it's below freezing.

davepoth

25,744 posts

104 months

Wednesday 27th June 2012
quotequote all
Saying 99% is a bit daft really; they should just give the mist forecast it entails, since that means something to people.

Alice Cupra

851 posts

142 months

Wednesday 27th June 2012
quotequote all
Ari said:
surely 100% humidity is pure water and we'll all drown!?
I've always thought that should be the case....... hehe

Vieste

10,532 posts

65 months

Wednesday 27th June 2012
quotequote all
It was hot today up north was close to drinking my own piss walking back home.
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Ari

Original Poster:

12,320 posts

120 months

Wednesday 27th June 2012
quotequote all
As opposed to who's!? redface

TheHeretic

73,668 posts

160 months

Wednesday 27th June 2012
quotequote all
Ari said:
As opposed to who's!? redface
Someone else's, obviously. wink

kiteless

7,680 posts

109 months

Wednesday 27th June 2012
quotequote all
Bear said:
It was hot today up north was close to drinking my own piss walking back home.