[gradsusr] Wind Barb Minimum

[Jeff Duda]

Daniel,
There's another way to do it. Use the maskout function.

'set gxout barb'
'set lev 850'
'define u = maskout(ugrdprs,1.94*mag(ugrdprs,vgrdprs)-20)'
'define v = maskout(vgrdprs,1.94*mag(ugrdprs,vgrdprs)-20)'
'd skip(u*1.94,14,14);v*1.94'

Jeff Duda

On Tue, Oct 28, 2014 at 8:16 AM, Daniel Nairn <dannairn at gmail.com> wrote:

> Perfect, thanks Stephen.
>
> On 28 October 2014 12:48, Stephen McMillan <smcmillan at planalytics.com>
> wrote:
>
>> Daniel,
>> You need to include the wind magnitude in your line, for example:
>>
>> 'd skip(u10*1.94,14,14);v10*1.94;1.94*mag(u10,v10)
>>
>> Stephen McMillan
>>
>> On Tue, Oct 28, 2014 at 4:32 AM, Daniel Nairn <dannairn at gmail.com> wrote:
>>
>>> Hello
>>>
>>> I'm successfully running a Grads script to display 850mb winds using
>>> wind barbs:-
>>>
>>> for example
>>>
>>> 'define u10 = const(ugrdprs(lev=850),0,-u)'
>>> 'define v10 = const(vgrdprs(lev=850),0,-u)'
>>> 'set gxout barb'
>>> 'set cmin 20'
>>> 'd skip(u10*1.94,14,14);v10*1.94'
>>>
>>> What I would like to do is use something like 'set cmin 20' to display
>>> only winds above 20 kts. However, setting this in the script file doesn't
>>> appear to work (I still get barbs with values less than 20kts appearing).
>>> Should I be using something else?
>>>
>>> Thanks
>>>
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>>>
>>
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>
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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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