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[aprssig] Snow and Visibility on APRS

Robert Kirk isobar at verizon.net
Fri Aug 20 15:29:35 UTC 2010

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

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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