[wxqc] Weather Underground and APRS Wind Speed Error

[Steve Hatchett]

Since "gust" is defined as the highest wind speed during the past 10 minutes
for APRS/CWOP (and maybe for Wunderground too), if you are submitting to
APRS and Wunderground at 15 minute (or more) intervals, then there is a 5
minute period every 15 minutes during which a high wind gust will not be
seen by APRS and Wunderground. This is normal. You could bump reporting
interval to 5 minutes. This would not help for MADIS displayed
representations of your APRS/CWOP data though, because MADIS only ingests
data at 15 minute intervals. I think they are working on changing that to 5
minutes.

Steve

-----Original Message-----
From: Michael Albers [mailto:k0fj at st-tel.net] 
Sent: 06/06/2007 4:30 PM
To: wxqc at lists.gladstonefamily.net
Subject: [wxqc] Weather Underground and APRS Wind Speed Error

I have my Davis Vantage Pro II sending data to Weather Underground and APRS
as well as my own web site www.k0fj.com <http://www.k0fj.com/>  .  The high
wind gust is correct on my WeaterLink 5.7 console and my web page at 56 MPH.
APRS and Weather Underground show 51 and 50 respectively.  Are these units
in knots as apposed to MPH, or is something else the problem on my end?

 

Thanks for any assistance with this. 

 

Michael Albers K0FJ