Mis-reporting of mist.

[Graham Easterling]

Camborne often seems to record haze as mist.

It is very hazy here, but even where the wind's onshore (which it isn't at Camborne) it's haze not mist.

Camborne is currently reporting (according toXCWeather)

Mist with an offshore SE wind

Temperature 23C

Dew Point 19C

Humidity  78%

Visibility 9000m, which is typical for Cornwall at the moment, and for the last couple of days.

Newquay looks like being Cornwall's hot spot again, probably 27C for the 4th consecutive day.

Graham

Penzance

[Freddie]

Definition of haze is visibility reduced by dust or solid particles with a lower bound of 1000 metres.  Ditto for mist with the threshold, but the reduction is due to (predominantly) water droplets.  Historically the humidity threshold of 95% was used because the human observer had no easy way of discerning whether that restriction was due to water droplets or not.  With the advent of automatic observations, perhaps the sensors in use can now differentiate?

I'm not disagreeing with you - with an RH of 78% I would be reporting it as haze.  Just trying to think of a justification for mist being used, as the AWS in use is capable of reporting haze too.

[Richard Griffith]

Wick Airport in Scotland often reports mist when RH is less than 95%. Apparently the present weather sensor does not have a relative humidity sensor attached/installed to reports mist instead of haze. Present weather code 10 (Mist) clearly states 'Visibility must be at least 1000m or more in ALL directions and Relative Humidity 95% or more'

Regards

Richard