# [Met_help] [rt.rap.ucar.edu #41665] History for 80 meter forecasts

RAL HelpDesk {for John Halley Gotway} met_help at ucar.edu
Fri Oct 29 12:54:48 MDT 2010

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Initial Request
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Hi John,

I know that we discussed this at the MET tutorial, but I wanted to
confirm before we considered going down this path...If we had a grib
file of 80-meter forecasts and then 80-meter wind observations could we
utilize point-stat to perform verification?

Also - your suggestion with the fcst valid end/begin time worked!
Thanks for helping!

Jackie

Jackie Miller
Meteorologist

Vaisala Inc.

Phone +1 303 885 3251
Mobile +1 303 885 3251
www.vaisala.com
<https://exchange.ou.edu/owa/redir.aspx?C=b302bd7f7cb24f099b2eb70ba1b9bf
5f&URL=https%3a%2f%2fwebmail.vaisala.com%2fexchweb%2fbin%2fredir.asp%3fU
RL%3dhttp%3a%2f%2fwww.vaisala.com>

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Complete Ticket History
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Subject: Re: [rt.rap.ucar.edu #41665] 80 meter forecasts
From: John Halley Gotway
Time: Thu Oct 21 11:24:26 2010

Jackie,

Yes, that should work.

In fact, in METv3.0, it should also work to verify a range of vertical
levels.  For example...

fcst_field[] = [ "UGRD/Z50-100" ];
obs_field[]  = [];

In this case, Point-Stat should look at the "height" value for each
observation.  If the observation height falls between 50 and 100, it
will be included in the verification.  Suppose you have wind
output every 10 meters and you have an observation at 65 meters.
Point-Stat will look at the values at 60 and 70 meters and interpolate
between them to 65.  So this verification task will include all
observations between 50 and 100.

If you verify "UGRD/Z80", it will only match observations that have a
height value of exactly 80.

You can perform the verification on whatever levels you'd like.

One thing to keep in mind is to make sure your observation heights are
defined in the same way as your forecast output.  In particular, make
sure they're both defined as meters above ground level
(AGL) or meters above sea level (MSL).  Point-Stat doesn't really
care, it's just checking to see if the observation height value falls
within the range you requested.

Just let me know if any issues arise.

And please send future MET support questions directly to
"met_help at ucar.edu".  That way we can track our support tasks better.

Thanks,
John

On 10/21/2010 11:15 AM, RAL HelpDesk {for John Halley Gotway} wrote:
>
> Thu Oct 21 11:15:25 2010: Request 41665 was acted upon.
> Transaction: Ticket created by johnhg
>        Queue: met_help
>      Subject: 80 meter forecasts
>        Owner: johnhg
>   Requestors: jackie.miller at vaisala.com
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=41665 >
>
>
> Hi John,
>
> I know that we discussed this at the MET tutorial, but I wanted to
> confirm before we considered going down this path...If we had a grib
> file of 80-meter forecasts and then 80-meter wind observations could
we
> utilize point-stat to perform verification?
>
> Also - your suggestion with the fcst valid end/begin time worked!
> Thanks for helping!
>
> Jackie
>
> Jackie Miller
> Meteorologist
>
> Vaisala Inc.
>
> Phone +1 303 885 3251
> Mobile +1 303 885 3251
> www.vaisala.com
>
<https://exchange.ou.edu/owa/redir.aspx?C=b302bd7f7cb24f099b2eb70ba1b9bf
>
5f&URL=https%3a%2f%2fwebmail.vaisala.com%2fexchweb%2fbin%2fredir.asp%3fU
> RL%3dhttp%3a%2f%2fwww.vaisala.com>

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