Here's a link to the Federal Meteorological Handbook; and the
specific sections about WInd Speed and Wind Gust...
http://www.ofcm.noaa.gov/fmh-1/
5.4.3 Wind Speed. The wind speed shall be determined by averaging the
speed over a 2-minute period.
At designated stations, Table 5-1 shall be used to estimate wind
speeds when instruments are out of service
or the wind speed is below the starting speed of the anemometer in use.
5.4.4 Wind Gust. The wind speed data for the most recent 10 minutes
shall be examined to evaluate the
occurrence of gusts. Gusts are indicated by rapid fluctuations in
wind speed with a variation of 10 knots
or more between peaks and lulls. The speed of a gust shall be the
maximum instantaneous wind speed.
Clay
N7QNM
On Dec 15, 2006, at 8:47 AM, Curt, WE7U wrote:
On Fri, 15 Dec 2006, Jason Winningham wrote:
On Dec 15, 2006, at 10:35 AM, Curt, WE7U wrote:
It also sounds like the values requested by NOAA are different than
the APRS spec dictates we transmit.
In this case, should we lobby to have the APRS spec changed to meet
NOAA standards?
I'm not a weather guy, so I want to stay out of it, but my tendency
would be to say "yes". It makes no sense to dump weather data into
the system that doesn't fit their models. That being said, perhaps
they already account for that in the APRS data they receive? Steve
Dimse would probably know this stuff.
--
Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
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