[wxqc] temperature errors

[Dan Crooks]

Same situation here at
CW1789<http://pond1.gladstonefamily.net:8080/cgi-bin/wxqchart.pl?site=C1789>.
Nighttime temps remain higher than the valley
and daytime highs are slightly lower.  More noticeable at night with less
wind to stir
things up.

I have a 1-wire station I want to put at the bottom of my driveway for the
same reason, house
is at 1309 ft and bottom of my driveway is 1000 ft.  Would be interesting to
see the difference
between the 2 locations.

I bought an Extech
RH390<http://www.omnicontrols.biz/products.asp?recnumber=3308>precision
psychrometer (NIST traceable) to verify my Davis VP2+
was reading correctly.  I had trouble believing my station readings and the
RH390 showed that
my station is reporting correct data for my location.



-Dan

On 10/18/06, Mark Wyman <mark at markwyman.com> wrote:
>
> Yes. I am on a fairly decent hill, at 1300 feet or so, our driveway has a
> 240' elevation change. At night the house is typically 5 degrees warmer
> than
> the bottom of the driveway, especially on frosty, still nights. The
> inversion can set up fairly steep even before the sun finishes setting!
> Much
> of the time I look out the window on the top and say "great, no frost this
> time", and get to the bottom of the driveway and it looks like someone
> exploded a large can of white paint.
>
> One of these days I will add a station to the bottom of the hill that can
> send all the way back to the top just to see the differences in real-time.
>
> -Mark
>
> -----Original Message-----
> From: wxqc-bounces at lists.gladstonefamily.net
> [mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of
> dbj at capital.net
> Sent: Tuesday, October 17, 2006 4:10 PM
> To: wxqc at lists.gladstonefamily.net
> Subject: [wxqc] temperature errors
>
> I checked the accuracy of my temperature sensor with another thermometer
> placed on top of the rain gauge and on the other side of the house last
> night.  Both sensors were within 1 degree F of each other.  So, assuming
> my
> sensor is accurate, why is my location so much warmer (up to 11 degrees
> warmer the night of October, 16) than neighboring stations most
> nights?   Could it be caused by temperature inversion because my neighbors
> are located at lower elevations in the Hudson River valley and I am on top
> of a hill at 645 feet?  Is temperature inversion typically a night-time
> phenomenon?
>
>
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