On Wed, 30 Dec 2009 10:52:34 -0000, Martin Rowley wrote:

I can't get that to work, keeps asking me to enter the dewpoint
temp
and units (which is a radio button with one enabled anyway). Isn't

it supposed to be working out the dewpoint given the pressure,
temperature, wet bulb and RH?

.... As the question earlier in the thread was how to work out the *wet
bulb*, given the dry bulb and dew point, then this is the appropriate
link.

Whoops, must have missed the slight change in thread direction. B-)

for practical meteorologists like what I am, this is the 'wrong' way
round of course, because we usually start with the dry bulb and wet
bulb, then require the other parameters which is probably what you
were expecting.

For those with AWS's though you have don't have the wet bulb temp
just temp, RH and pressure. My AWS goes "out of range" when the
(calculated) dewpoint drops below freezing. Having something I can
plug the temp and RH into that produces negative dew points is
useful. The link I gave before agrees with the NOAA site.

--
Cheers Dave.
Nr Garrigill, Cumbria. 421m ASL.