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Old September 21st 05, 09:51 AM posted to sci.geo.meteorology
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Default Averaging wind speed in tropical and extra-tropical storms


On the NOAA webpage I noted that the classification on hurricane strength was based on
wind speed averaged over 1 minute. At least in Europe classification of wind speeds in extra-tropical
storms call for a 10 minute average. Going from 10 to 1 minute average may yield a quite large
increase in wind speed, depending on the nature of the storm and terrain. I suppose for
a tropical storm over ocean, it is probable not that large variation? For an extra-tropical
storm over hilly terrain, the effect may be going from a strong gale to close to hurricane wind speed
Are there no agreed on definition of wind speed?



Øyvind Seland







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Old September 23rd 05, 12:10 AM posted to sci.geo.meteorology
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Default Averaging wind speed in tropical and extra-tropical storms

Would you stand out in 135mph winds for 10mins?

"Øyvind Seland" wrote in message
...

On the NOAA webpage I noted that the classification on hurricane strength

was based on
wind speed averaged over 1 minute. At least in Europe classification of

wind speeds in extra-tropical
storms call for a 10 minute average. Going from 10 to 1 minute average may

yield a quite large
increase in wind speed, depending on the nature of the storm and terrain.

I suppose for
a tropical storm over ocean, it is probable not that large variation? For

an extra-tropical
storm over hilly terrain, the effect may be going from a strong gale to

close to hurricane wind speed
Are there no agreed on definition of wind speed?



Øyvind Seland









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Old September 23rd 05, 12:16 AM posted to sci.geo.meteorology
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Default Averaging wind speed in tropical and extra-tropical storms

The height on the bouys that are used run about 30m which the frictional
effects of land can be assumed to be nil...on land the wind sensors at most
airports sits ~6m of the gorund in which case would yield different wind
speeds. Hurricane tracking software is now incorporating frictional effects
as the storms approach land and do a fairly good job of accounting for
terrian effects.
"Øyvind Seland" wrote in message
...

On the NOAA webpage I noted that the classification on hurricane strength

was based on
wind speed averaged over 1 minute. At least in Europe classification of

wind speeds in extra-tropical
storms call for a 10 minute average. Going from 10 to 1 minute average may

yield a quite large
increase in wind speed, depending on the nature of the storm and terrain.

I suppose for
a tropical storm over ocean, it is probable not that large variation? For

an extra-tropical
storm over hilly terrain, the effect may be going from a strong gale to

close to hurricane wind speed
Are there no agreed on definition of wind speed?



Øyvind Seland









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Old September 23rd 05, 01:25 PM posted to sci.geo.meteorology
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Default Averaging wind speed in tropical and extra-tropical storms


I'm not sure which buoys you are talking about here,
but the NOAA ones have sensors nowhere near 30m. More
like 10 at most -- and those are the big disc buoys
in the middle of the gulf.

See, for example

http://www.ndbc.noaa.gov/station_page.php?station=42001
http://www.ndbc.noaa.gov/station_page.php?station=42003


Scott

Shawn Delaney wrote:
The height on the bouys that are used run about 30m which the frictional
effects of land can be assumed to be nil...on land the wind sensors at most
airports sits ~6m of the gorund in which case would yield different wind
speeds. Hurricane tracking software is now incorporating frictional effects
as the storms approach land and do a fairly good job of accounting for
terrian effects.
"Øyvind Seland" wrote in message
...

On the NOAA webpage I noted that the classification on hurricane strength


was based on

wind speed averaged over 1 minute. At least in Europe classification of


wind speeds in extra-tropical

storms call for a 10 minute average. Going from 10 to 1 minute average may


yield a quite large

increase in wind speed, depending on the nature of the storm and terrain.


I suppose for

a tropical storm over ocean, it is probable not that large variation? For


an extra-tropical

storm over hilly terrain, the effect may be going from a strong gale to


close to hurricane wind speed

Are there no agreed on definition of wind speed?



Øyvind Seland










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Old September 23rd 05, 02:17 PM posted to sci.geo.meteorology
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Default Averaging wind speed in tropical and extra-tropical storms

Sorry, use to looking at the Keys.

"Scott" wrote in message
...

I'm not sure which buoys you are talking about here,
but the NOAA ones have sensors nowhere near 30m. More
like 10 at most -- and those are the big disc buoys
in the middle of the gulf.

See, for example

http://www.ndbc.noaa.gov/station_page.php?station=42001
http://www.ndbc.noaa.gov/station_page.php?station=42003


Scott

Shawn Delaney wrote:
The height on the bouys that are used run about 30m which the frictional
effects of land can be assumed to be nil...on land the wind sensors at

most
airports sits ~6m of the gorund in which case would yield different wind
speeds. Hurricane tracking software is now incorporating frictional

effects
as the storms approach land and do a fairly good job of accounting for
terrian effects.
"Øyvind Seland" wrote in message
...

On the NOAA webpage I noted that the classification on hurricane

strength

was based on

wind speed averaged over 1 minute. At least in Europe classification of


wind speeds in extra-tropical

storms call for a 10 minute average. Going from 10 to 1 minute average

may

yield a quite large

increase in wind speed, depending on the nature of the storm and

terrain.

I suppose for

a tropical storm over ocean, it is probable not that large variation?

For

an extra-tropical

storm over hilly terrain, the effect may be going from a strong gale to


close to hurricane wind speed

Are there no agreed on definition of wind speed?



Øyvind Seland














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Old September 23rd 05, 06:48 PM posted to sci.geo.meteorology
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Default Averaging wind speed in tropical and extra-tropical storms

On Thu, 22 Sep 2005 23:16:39 GMT,
Shawn Delaney , in
wrote:
+ The height on the bouys that are used run about 30m which the frictional
+ effects of land can be assumed to be nil...on land the wind sensors at most
+ airports sits ~6m of the gorund in which case would yield different wind
+ speeds.


The standard observation height at the surface is 10m.

Some buoys have 10m masts. Most are 3m masts, and the data is adjusted
to 10m.

Ships can have variable height instrument packages. Also, a ship's
profile can influence the wind speed/direction measurements.

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.
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