[wxqc] Curious about analysis C2582

Tue Oct 10 09:19:07 CDT 2006

The weather QC process is a necessary tool but not infallible, you have to know how to interpret it's results. Your station could be providing accurate data while another nearby station(s) in your area could be in error but close to each other, so the Weather QC process tags your station.

My Davis Vantage Pro2 with fan aspirated shelter has been getting the dreaded big red X for dewpoint since installation. However it's dewpoint readings are within 0.1 deg. F of my back up weather station and also my NWS type sling psychrometer so I just ignore the error. 

In my case the local FAA weather observations at Lakeland Linder Airport approximately 5 miles to my WNW have been reporting inaccurately low  dewpoint readings for several years. I've attempted to get their error issue resolved but have not been successful. KLAL is a busy airport with numerous private flights and some commercial ones too and home to the very popular Sun N' Fun Flyin air show. However weather observations are taken manually and cease between 11:00 pm-9:00 am. 

However in your case the exposure of your weather station could be the problem. The best course of action is to have certified accurate hand held weather instruments on hand to compare too.

Take Care,
Thomas F. Giella, KN4LF
Retired Meteorologist & Space Plasma Physicist
Lakeland, FL, USA
flycylone at tampabay.rr.com

NWS Tampa Bay, FL SKYWARN Observer #POL-10A
CWOP Station #AR692/KN4LF

Live Lakeland, FL Weather Observations: http://www.kn4lf.com/index1.html
Lakeland, FL Daily Climatological Weather Data Archive: http://www.kn4lf.com/kn4lf22.htm
September 2006 Lakeland, FL Daily Climatological Weather Observations http://www.kn4lf.com/kn4lf63.htm
Florida/US Raw Weather Forecasting Resource Links: http://www.kn4lf.com/kn4lf13.htm
Man Induced Climate Change Refuted: http://www.kn4lf.com/globalwarminglie.htm
New Scientific Evidence for the Existence of God: http://www.cosmicfingerprints.com/audio/newevidence.htm 

  ----- Original Message ----- 
  From: Kevin Reed 
  To: wxqc at lists.gladstonefamily.net 
  Sent: Tuesday, October 10, 2006 1:48 AM
  Subject: [wxqc] Curious about analysis C2582

  Howdy....

  First post...

  Been watching the analysis of my weather station and constantly see that the dewpoint is regularly marked as having a signifcant mean error.

  The dewpoint of my station is a calculated value, by the weather station software and is not actually a sensor so there is not really anything to adjust.  The baro and temp is normally listed as okay (Green Check), but the dewpoint rarely is. 

  The station is located in a not so optimal location, in that is is near a block wall which has a paved street on the otherside, so I would expect to see temps slightly higher as a result. But I find it interesting that the other two values are normal green, and the dewpoint is not. 

  The analysis as I understand them are based on other local stations and looking at some of them, they appear to be way off.  Could these be playing a part in the readings being so off for the dew point.  

  Most notable are two stations which have readings like: 

  Station Distance    Baro        Temp    Dewpoint
  CW1832    6.6 miles    164.9    28.2    12.1
  CW2017    10.1 miles    0.0       -4.9    63.1

  The following link shows the report as I saw it tonight.

  http://www.tnetweather.com/cwop/cwop-2582-10-9.pdf

  Wasn't sure how to provide the info from the report so I took a pdf snapshot of it.

  Interested in comments.... 

  Thanks.

  -- 
  Kevin Reed
  TNET Services, Inc.
  tnet.services at gmail.com
  Mesa AZ Weather Info - http://www.tnetweather.com 

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