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[aprssig] Wind speed/direction

Chuck Kimball n0nhj at yahoo.com
Wed Jul 28 23:20:37 UTC 2004


GUST---A sudden significant increase in or rapid fluctuations of wind 
speed. Peak wind must reach at least 16 knots (18 miles per hour) and 
the variation between peaks and lulls is at least 10 knots (11.5 miles 
per hour). The duration is usually less twenty seconds.

Most of the references I could find said 3 seconds was the WMO 
recommendation, but 5 seconds was used in North America.


Take a look at these....

<http://www.mnsu.edu/weather/218labs/glossary/glossary_g.html>

<http://www.msc-smc.ec.gc.ca/education/imres/42_instruments/4_2_1_2_wind_e.cfm>

<http://ingrid.ldeo.columbia.edu/dochelp/QA/Technical/def_wind.html>

<http://ams.confex.com/ams/annual2001/11smoi/abstracts/18249.htm>





Scott Miller wrote:

>>Yes, that is what I would do.  I cannot guarantee what
>>client software will do with it, but I would consider that
>>to be IAW the spec...
>>    
>>
>
>I thought I heard that the Kenwoods choke on that...
>
>Anyway, while we're on the subject, I don't think I ever got an answer to my
>question about gust calculation.  How should that be done?  It's the one
>remaining part I need to finish on my 1-wire weather station support for the
>OpenTracker.
>
>Scott
>N1VG
>
>
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