Can someone give me the exact definition of what a "gust wind" is? I
haven't been able to find it on the Net. I assume that is measuring the
wind speed for a certain amount of time and the wind speed is above
some minimal standard value. Assuming that this is the definition, what
is the amount of time that it is measured for and what is the minimal
speed to be considered a gust wind? And are there any other factors
that need to be taken into account for it to be considered a gust wind?

Thanks for your help
Johann Blake

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.

Source:
http://www.ofcm.gov/fmh-1/pdf/E-CH5.pdf

wrote in message
oups.com...
Can someone give me the exact definition of what a "gust wind" is? I
haven't been able to find it on the Net. I assume that is measuring the
wind speed for a certain amount of time and the wind speed is above
some minimal standard value. Assuming that this is the definition, what
is the amount of time that it is measured for and what is the minimal
speed to be considered a gust wind? And are there any other factors
that need to be taken into account for it to be considered a gust wind?

Thanks for your help
Johann Blake

I have a weather station. It displays both the current wind speed and
gust wind speed. The current wind speed is updated about once every 2
minutes. I assume that the gust wind is, according to the standard
you've indicated, updated every 10 minutes, but I will have to verify
that.

Let's say the current wind speed is 15 knots and varies randomly
between 12 knots and 18 knots over a period of one hour. And let's say
that during a 10 minute interval it is noticed that the wind varies
between 13 and 17 knots. Does this imply that there is a gust wind of
17 knots? I find this difficult to understand because I don't see any
difference between the current wind speed and the gust speed. Then
again, maybe I'm assuming something wrong. According to the definition
you provided, I believe the key word is "rapid" fluctuations. Perhaps
it is *how fast* the wind changes, that is, the rate of change. Can you
clarify the definition a little more in regard to the example wind I
just stated?

Thank you
Johann Blake

On 19 Oct 2005 23:02:28 -0700,
, in
.com wrote:
+ I have a weather station. It displays both the current wind speed and
+ gust wind speed. The current wind speed is updated about once every 2
+ minutes. I assume that the gust wind is, according to the standard
+ you've indicated, updated every 10 minutes, but I will have to verify
+ that.

I would guess that your weather station just displays the peak wind
within that 2 minute window, and doesn't care a lick about the
official definition.

James
--
Consulting Minister for Consultants, DNRC
I can please only one person per day. Today is not your day. Tomorrow
isn't looking good, either.
I am BOFH. Resistance is futile. Your network will be assimilated.