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Doyle
01-27-2007, 11:41 AM
Quick question for all. Why is that the temp at 2300' is usually warmer than the temp at the base?

I understand radiational cooling comes into play, but I have been sort of tracking this and see the temp higher at the 2300' weather station when it is cloudy as well.

Additionally the temp at the next station and it's predecessors at higher elevations have a lower temp as well.

Basically it seems to be a warm "spot" on a consistent basis.

I apologize if this is a basic question and there is a simple answer.

Brad
01-27-2007, 11:49 AM
Here is one example of what you are talking about.

http://images12.fotki.com/v252/photos/1/1002902/4064008/20070127_113809_conditions-vi.jpg

Earlier this morning the base was a lot colder than the summit. Later in the day this will be reversed as things warm up at the base. It may be that we are in the transition now and the heat has gotten to mid-auto road level and not at the base yet.

How is this for a non-weather guy's guess?

KD Talbot
01-27-2007, 12:21 PM
Often there is what they call "inversion" where the valleys are colder than the summits. On Saturday, November 25th '06 while I was volunteering on the summit the temp at Pinkham Notch was 11 and it was 41 on the summit! I will leave it up to the weather guys to explain the mechanics of why this happens. I also recall some question as to the reliability of the temp readings at the base of the Auto Road. Not sure the instrument is in an ideal spot and may be subject to outside influences not associated with the true temp. At home I have thermometers on 2 sides of the house and they read quite differently most of the time.
KDT