[wxqc] Temp Issue Maybe

Mon Jul 17 22:01:53 EDT 2006

... of course Oke's WMO reports were extensively referenced in the CWOP 
Guide (see the bibliography citations).
Dave
CW0351

Gerry Creager N5JXS wrote:

>And, while strongly seconding Dave's comments, I also strongly recommend 
>a read of Tim Oke's Urban Mesonets document for the WMO, which can be 
>found at 
>http://www.wmo.ch/web/www/IMOP/publications/IOM-81/IOM-81-UrbanMetObs.pdf 
>and is linked off http://www.wxqa.com/resources.html.
>
>gerry AP009
>
>Dave Helms wrote:
>  
>
>>CWOP Guide, based on NWS COOP and ASOS standards, recommends 5 feet/1.5 
>>meters AGL for temperature/RH sensor siting.  Read the entire 
>>temeprature/RH section for more info:
>>http://mywebpages.comcast.net/dshelms/CWOP_Guide.pdf
>>
>>Chuck Goble wrote:
>>
>>
>>    
>>
>>>Well I raised my ISS  to just under 9 ft. My temps are right with 
>>>Wunderground and Weather.com and sometimes a bit lower by a degree or 
>>>two. The fan will have to wait. We had a nice little breeze today out 
>>>of the southeast which is good because hits my ISS so it helps out a 
>>>bit. I will see the next couple of days and see how it goes. Thanks 
>>>dr. Lee for the info. I have had my station up since the end of Nov 
>>>2005 so I am still fairly new at this.
>>>
>>>Chuck
>>>
>>>dr. Lee wrote:
>>>
>>>
>>>      
>>>
>>>>Chuck, the national weather service standard for the instrument package
>>>>except the wind speed instrument is 3m above the ground.  The anemometer
>>>>should be at 33ft above the ground but, no site is perfect.  Adjust your
>>>>software or move the instrument package to a location that works with all
>>>>graphs.  Does your instrument package have a fan that keeps the air moving
>>>>over the sensors?  If you do not have this option on a davis you can and
>>>>probably will get a higher temp during the day as the sun will warm the
>>>>cover and the cover will increase the temp of the air inside around the
>>>>sensors.
>>>>
>>>>The graphs are a comparison of all stations in the area you are so if there
>>>>are other systems in town all would show the increase in temp and this would
>>>>tend to null out the increase.  It still looks like you need a fan to keep
>>>>the air moving inside of the instrument package to solve your problem.  Look
>>>>at the graph of another station close to you and compare the temps during
>>>>the day and at night to see if there is a difference and how much there is
>>>>day and night as day time can again increase the temp inside of the
>>>>instrument cover unless you have a fan that keeps the air moving thought the
>>>>unit.
>>>>
>>>>N5IHE
>>>>
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>>>-----Original Message-----
>>>>>From: wxqc-bounces at lists.gladstonefamily.net 
>>>>>[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of 
>>>>>Chuck Goble
>>>>>Sent: Sunday, July 09, 2006 11:56 PM
>>>>>To: wxqc at lists.gladstonefamily.net
>>>>>Subject: [wxqc] Temp Issue Maybe
>>>>>
>>>>>
>>>>>I am new to the forum so be easy with me. I will do my best 
>>>>>to describe 
>>>>>my issue. I have a Davis VP2 wireless standard version. I am 
>>>>>located in 
>>>>>Minot, North Dakota. I don't if it is an issue or what. I had my ISS 
>>>>>located on a mast on my roof along with the anemometer. The ISS was 
>>>>>about 5ft above the roof top and roughly 20 ft. above the 
>>>>>ground and my 
>>>>>temp readings where within CWOP deviations. Then I relocated my ISS 
>>>>>about 4.5 ft above the ground. Then my temp readings are 
>>>>>higher and now 
>>>>>red x according to CWOP. According to the manual you want it no more 
>>>>>than 6 ft above the ground if I remember correctly. There is 
>>>>>not a lot 
>>>>>of trees around and for the most part it is in an area that 
>>>>>gets plenty 
>>>>>of breeze when it blows.
>>>>>
>>>>>The couple of questions that I have is I live right in the middle of 
>>>>>town wouldn't my temps be a bit higher due to the fact being in the 
>>>>>middle of town the heat will dissipate slower so my temps 
>>>>>will be higher 
>>>>>for the most part. The other two CWOP stations one is on the edge of 
>>>>>town and the other one which is the airport is in the wide open area. 
>>>>>I'm thinking my temps will be different than theres. My next 
>>>>>question is 
>>>>>if my temps are high and my humidity is running 4.5% drier why is my 
>>>>>dewpoint almost right on. But the graph to me does not look that way. 
>>>>>Maybe I am reading the graphs wrong.
>>>>>
>>>>>I hope this is not to long. If I missed anything please let 
>>>>>me know and 
>>>>>I will get what info you need if I can. Sorry again if this 
>>>>>is too long.
>>>>>
>>>>>Thanks,
>>>>>Chuck
>>>>>_______________________________________________
>>>>>wxqc mailing list
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>>>>>
>>>>>The contents of this message are the responsibility of the author.
>>>>>
>>>>>  
>>>>>
>>>>>          
>>>>>
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>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>------------------------------------------------------------------------
>>>
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>>>
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>>>
>>>      
>>>
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>>    
>>
>
>  
>