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[aprssig] Snow and Visibility on APRS

Gerald Creager gerry.creager at tamu.edu
Mon Aug 23 17:07:35 UTC 2010


Robert,

While the synoptic scale atmosphere is not that precise, the specs on 
the instruments and their reporting are. That's all I'm asking for, is 
hte ability where the instruments can meet the WMO and NWS specs for 
instrument reporting, realizing that a lot of the APRS-WX stations 
reporting today can't meet that. Yet.

Does this help?

gerry n5jxs

Robert Kirk wrote:
> Gerry... I don't know what the APRS precision specs are now, so I'm not 
> sure you're looking for better specifications of precision (Are they 
> confusing/inconsistent?) or for increased precision itself in APRS 
> reports. If the former, I'm all in favor; if the latter, I think your 
> precision wishlist is too high (for synoptic APRS as opposed to 
> micrometeorology studies). Values of whole temperature degrees and wind 
> speed are perfectly fine. Likewise, pressure PPPP.p in millibars (or 
> PP.pp in inches). The synoptic scale atmosphere is just not that precise 
> itself, and weather map analyses just smooth out higher precisions, 
> anyway. I'd suggest:
> TTT (F or T
> PPPPp (mb) PP.pp (in)
> SSS  (K or MpS)
> DD (wind direction 10 degrees)
> 
> What does METAR suggest nowadays? I'm behind the times
> 
> Bob Kirk
> N3OZB
> 
> 
> At 08:43 PM 8/19/2010, Gerry Creager wrote:
>> It would be real nice to see precision addressed appropriately for 
>> meteorological observations... TTT.t, for example, PPPP.pp, wind which 
>> could be reported in knots or meters/sec, with at least SSS.s precision.
>>
>> That's on my wishlist.
>> gerry n5jxs
> 
> 
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
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