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99% humidity?

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Ari

Original Poster:

12,679 posts

125 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

4,135 posts

113 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

26,579 posts

109 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

885 posts

147 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

70 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:

12,679 posts

125 months

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

TheHeretic

73,668 posts

165 months

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

kiteless

7,761 posts

114 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.