Hi just wondering about this myself when I stumbled across this post.
Thomas your explanation is correct I think, however, there is a small error
in your formula below.
I think it should read:
RMS = sqrt(1/n * (x1**2 + x2**2))
In the case of your example:
RMS = sqrt(1/2 * (0**2 + 20**2))
= sqrt(200)
= 14.1
Cheers,
Brad
On Monday, 4 August 2014 02:28:24 UTC+12, Thomas Keffer wrote:
>
> RMS is "root mean square". That is, you square the velocities, take the
> average of that, then take the square root of the result.
>
> Why is it useful? Because it reflects the "average energy." Remember, the
> energy of the wind goes as the *square* of the velocity. Strong winds
> count for more than weak winds. RMS reflects this.
>
> Suppose you have no wind for an hour, then 20 mph winds for another hour.
> The average wind is 10 mph, but the RMS wind is 14.1 mph (=sqrt(20**2)),
> reflecting the extra energy of those 20 mph winds.
>
> Hope that helps
>
> -tk
>
>
> On Sun, Aug 3, 2014 at 6:22 AM, Craig Dabbs <[email protected]
> <javascript:>> wrote:
>
>> Hi there,
>>
>> Im all new to the weewx scene, im using a WMR100 station to mainly
>> monitor wind speed. As im not very clued up on weather terms i was
>> wonderingg what does RMS mean?
>>
>> Thanks
>> Craig
>>
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