Weekly Chat, Sunday September 13, 2009

Cirrus

Good to see you around again ... i was getting worried! I haven't been around much lately ... got the dreaded swine flu   :(((     .... but feeling a bit better today thank goodness.

Latest weather from Tracy Island;

Medium level cloud

Temp 16.7

Wet bulb 13.2

Humidity 52%

Wind NNE 17kph gusting to 29kph

Visability 40km

Dewpoint 8.4

Pressure 1027 falling

Sorry you have thf flu Djoan, but glad you have felt a little better today

Alan, what is "wet bulb" in your weather report?

Sunny and 19 degrees here, forcast to go to 25, very pleasant.

Gary.

I hope this makes sense.

Wet-bulb temperature - there are several meanings of this term:

1. The temperature read from a wet bulb thermometer,
2. Isobaric wet-bulb temperature: the temperature an air parcel would have if cooled adiabatically to saturation at constant pressure by evaporation of water into it, all latent heat being supplied by the parcel;
3. Adiabatic wet-bulb temperature: the temperature an air parcel would have if cooled adiabatically to saturation and then compressed adiabatically to the original pressure in a moist-adiabatic process (AMS Glossary).

Alan: Thanks for precise description of the meaning of 'wet-bulb' - quite simple, really, when you know!!!!

Think I'll stick to the usual temperatures (which are in themselves bad enough, with their variations, its worse than when the currency went decimal & no-one went shopping for 3 days because they didn't understand it).

Been to the marshes at Parkgate, on the side of the River Dee, this morning, & saw kestrel(s) hovering, wonderful.

Thanks Alan. Clear as mud to me!!!!! Still, now I know. Like you Lindybird, I will stick to the "normal" temp readings:)

Sounds like you had a lovely view of the kestrels. We have Red Tailed hawks here are they are lovely to watch.

They sound great, Gary.  As you can gather, I specially love the birds of prey. Trouble is, when we go looking, our present 'family' includes me, husband and enthusiastic dog! - who just loves chasing things, so its just as well that most of the birds on view are in flight.

Great to get new report from LG that both birds are OK, and Mallachie is still pressing on in her foreign travels. Can't help wondering if Rothes is going to spend the winter in France...

Lindybird, nothing like going for a walk with dog:) We don't have one but enjoy talking the neighbour's.

I still think Rothes will have to move further south.

Unknown said:

Gary.

I hope this makes sense.

Wet-bulb temperature - there are several meanings of this term:

1. The temperature read from a wet bulb thermometer,
2. Isobaric wet-bulb temperature: the temperature an air parcel would have if cooled adiabatically to saturation at constant pressure by evaporation of water into it, all latent heat being supplied by the parcel;
3. Adiabatic wet-bulb temperature: the temperature an air parcel would have if cooled adiabatically to saturation and then compressed adiabatically to the original pressure in a moist-adiabatic process (AMS Glossary).

OK!  Now Alan, after explaining all that to us, is your 'wet bulb' reading isobaric or adiabatic??????  ;-))

I'm more inclined to think it's the reading after you've dropped the thermometer in your drink! ☺☺☺