Not exact matches
Air can
not cool below its
dew point, so water - saturated air all tends to settle at about the same temperature.
No vector polygons, no
dew point calibration and it won't remind you to wear a jacket.
Not everyone is convinced of course, but I wonder if graphing
dew point temperatures would show something more definite?
Does anyone know why the only surface humidity field from the ERA - Interim dataset is 2m
dew point and
not the more commonly used fields of specific humidity and / or relative humidity (which are also available as pressure level fields)?
The reason ERA - Interim only has 2m
dew point temperature and
not specific or relative humidity is historical.
Air containing water vapor, cooled to (and under) its
dew point, will
not undergo homogenous condensation (supersaturation).
In an irony
not appreciated except by building science geeks ventilation air in the summer months in most parts of North America brings moisture into crawlspaces and deposits this moisture on surfaces that are below the ventilation air
dew point.
When that air finds a surface, such as a cold duct boot, at a temperature below the
dew point, the water vapor just can't help itself.
Old crawlspace floor framing was
not only warmer than the ground but also warmer than the ventilation air
dew point.
This is getting to be about the right time of year, there will be 50 degree days that during the night the temp drops below the
dew point wringing water out of the air which collects on the grass (but
not bare surfaces), and under an ice cold sky turns to frost.
Dew point is a better measure of what's happening with the humidity because it shows whether or
not the actual number of water vapor molecules changes over time.