[wxqc] Future Davis WeatherLink software development for CWOP

[Dave Helms]

Hi Steve,

The wind spec you list is exactly what I had on my email.  You are 
correct about the NWS instrument standards for time sample duration 
means for temp and RH and we even put those sample durations into Table 
1b of the CWOP Guide.   I'll update the info I gave Davis for 1 and 5 
minute averages for RH and Temp respectively. 

Good catch on the pressure time sample spec, I had assumed pressure was 
the only instantaneous parameter measured (I'm biased by my "old school" 
way of manually "thumping" the aneroid barometer to get the pressure).  
Whether the pressure is or is not an instantaneous measurement, we have 
failed to specify what the standard should be.  We will address this 
issue in the next edit of the Guide.

Dave
CW0351

spamfree at pensom.org wrote:

>Hi,
>
>To be in line with other NWS reporting standards (such as ASOS), I think the data items would be:
>Altimeter - lowest altimeter reading during past 1 minute
>* Temperature - average temperature over past 5 minutes
>* Humidity - average humidity over past 1 minute
>Wind dir - average direction over past 2 minute
>Wind speed - average speed over past 2 minutes
>Wind gust - high wind speed over past 10 minutes
>
>Great news that Davis will support CWOP data!
>
>Best regards,
>Steve  H.
>  
>======= At 2006-02-11, 16:47:49 you wrote: =======
>
>  
>
>>Davis has agreed to schedule to following software development changes 
>>in support of CWOP:
>>1.  Support the 1 hour and 24 hour rainfall accumulation parameters in 
>>APRS message (currently only support the since midnight rainfall)
>>2.  Support  altimeter pressure reduction*
>>3.  Support "auto roll-over" for APRS-IS servers (time-out and try 
>>another server if the promary server is not reachable)
>>4.  Support "rotatewx.aprs2.net" as primary APRS-IS server (this is an 
>>APRS-IS load balancing technique which will cycle uploads through the 
>>APRS-IS servers more or less equally)
>>5.  Standardization of wind parameter calculation:  2 minute sample 
>>duration to derive mean wind, 10 minute sample duration for peak gust
>>6.  Standardization of temperature and humidity calculation:  2 minute 
>>sample duration to derive mean temperature and RH
>>*Note:  Weather Monitor will not be supported.  Work around is to 
>>manually adjust pressure from the Weather Monitor console.
>>
>>Many of the parameters are "derived" in that they are not instantaneous 
>>measurements from the raw data stream and require additional 
>>calculations (e.g. altimeter pressure) and/or time range sample to 
>>calculate a mean and/or peak (wind, temperature, RH).  These additional 
>>calculations are accomplished by the WeatherLink "Bulletin" function, 
>>thus the "Bulletin" needs to be open to support the CWOP/APRSWXNET 
>>parameters.
>>
>>Please let me know if I forgotten any of the WeatherLink issues we have 
>>discussed which need software development. Software development in 
>>support of these changes should start in about 3 months.  A beta release 
>>of the updated WeatherLink code will be available thereafter.
>>
>>Dave
>>CW0351
>>
>>
>>Jim McMurry wrote:
>>
>>    
>>
>>>For those who are running WeatherLink, there's a new Weather Underground
>>>module available from their web site that will hopefully cure the occasional
>>>hangup problems.  Part of the documentation follows:
>>>
>>>README Contents 02-08-2006
>>>
>>>Weather Underground Expansion Module Version 1.9 for WeatherLink
>>>
>>>Changes since last revision:
>>>+ added rapid fire updates
>>>+ changed wind speed to send 10 minute average (instead of instantaneous)
>>>when not in rapid fire mode
>>>+ changed wind gust calculation period to 1 minute.
>>>Changes through 1.7:
>>>+ fixed wind direction values for uploading archived observations
>>>+ added 10 second timeout to observation uploads in case WUnderground is
>>>unreachable
>>>
>>>Jim McMurry
>>>C3882
>>>
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>>>
>>>
>>> 
>>>
>>>      
>>>
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>>    
>>
>
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>