[wxqc] Temp Issue Maybe

Tue Jul 18 00:08:56 EDT 2006

Well the difference between 5 and 9 ft is very minimal. Actually I have 
not seen much difference according to CWOP quality checks. I know the 
book says that but when you have data that is showing hardly any 
difference I will just keep it 9 ft, plus I feel safer it is that high 
so the neighbor kids or my little ones don't mess with it. Thanks for 
all the info. I will keep those manuals on my computer for further 
reading if need be.

Chuck

Dave Helms wrote:
> ... 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
>>>>>> wxqc at lists.gladstonefamily.net 
>>>>>> http://pond1.gladstonefamily.net:8080/mailman/listinfo/wxqc
>>>>>>
>>>>>> The contents of this message are the responsibility of the author.
>>>>>>
>>>>>>  
>>>>>>
>>>>>>          
>>>>>>
>>>>>>             
>>>>> _______________________________________________
>>>>> wxqc mailing list
>>>>> wxqc at lists.gladstonefamily.net
>>>>> http://pond1.gladstonefamily.net:8080/mailman/listinfo/wxqc
>>>>>
>>>>> The contents of this message are the responsibility of the author.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>        
>>>>>
>>>>>           
>>>> ------------------------------------------------------------------------
>>>>
>>>> _______________________________________________
>>>> wxqc mailing list
>>>> wxqc at lists.gladstonefamily.net
>>>> http://pond1.gladstonefamily.net:8080/mailman/listinfo/wxqc
>>>>
>>>> The contents of this message are the responsibility of the author.
>>>>
>>>>      
>>>>
>>>>         
>>> _______________________________________________
>>> wxqc mailing list
>>> wxqc at lists.gladstonefamily.net
>>> http://pond1.gladstonefamily.net:8080/mailman/listinfo/wxqc
>>>
>>> The contents of this message are the responsibility of the author.
>>>    
>>>
>>>       
>>  
>>
>>     
>
> _______________________________________________
> wxqc mailing list
> wxqc at lists.gladstonefamily.net
> http://pond1.gladstonefamily.net:8080/mailman/listinfo/wxqc
>
> The contents of this message are the responsibility of the author.
>
>
>   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://pond1.gladstonefamily.net:8080/pipermail/wxqc/attachments/20060717/5e3b5a06/attachment-0001.html 