[wxqc] Temperature "errors"

[Evan Bookbinder]

You are correct. I was referring to Jim's original post. That's what 
happens with top posting (for which I'm equally guilty). Sorry about 
that Gary.


>Evan, I'm the guy who tried to help with the topo suggestion.  Please get
>your target correct.
>
>Gary
>
>  
>
>>-----Original Message-----
>>From: wxqc-bounces at lists.gladstonefamily.net
>>[mailto:wxqc-bounces at lists.gladstonefamily.net]On Behalf Of Evan
>>Bookbinder
>>Sent: Thursday, September 22, 2005 7:43 AM
>>To: Discussion of weather data quality issues
>>Subject: Re: [wxqc] Temperature "errors"
>>
>>
>>Gary,
>>
>>I guess a little sarcasm is good now and again, but I found that your
>>tongue-in-cheek comments were a bit out of line. Several members of this
>>group have provided excellent documentation on what QC is, how it's done
>>and what it means. These insightful documents likely would have
>>circumvented the need for your email.
>>
>>Ignoring some incorrect assumptions made on the development of frost and
>>the killing of tender vegetation, let's make the obvious assumption that
>>your observation of 32F is correct.
>>
>>1.) Minimum temperatures are HIGHLY susceptible to terrain and land
>>cover/usage. It is perfectly normal to have a 10 or more degree spread
>>over several miles and a hundred feet elevation change on a clear, calm
>>night. (I'm not going to get into a dissertation on cold air drainage
>>and nocturnal inversions here).
>>
>>2.) Not NOAA, nor anyone else, is rejecting anyone's data, contrary to
>>your belief. We receive all data, good and bad. The QC tool merely
>>provides you with the feedback necessary to determine whether an
>>instrument could be failing or is incorrectly sited. These reports
>>should never be used on a daily basis (due to local effects, frontal
>>passages, etc...) and a long term average on the order of a few weeks
>>should be used to determine systematic errors with your instrumentation.
>>In this case, it's obvious that your local siting plays a huge roll in
>>cold air drainage at night. The algorithm is nothing more than a
>>mathematical equation used to relate your readings to surrounding sites.
>>There's no standard "negative lapse rate" for cold air draining, so
>>there's nothing that can be done to factor elevation into the
>>algorithm.  So, if your daytime highs are QCing just fine, feel free to
>>ignore the QC message on the min temperature.
>>
>>Hope this helps,
>>Evan
>>
>>
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>>
>>    
>>
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