[Met_help] [rt.rap.ucar.edu #97522] History for MET-TC: How is "A/BAL_WIND_34" Calculated?
Minna Win via RT
met_help at ucar.edu
Thu Nov 19 14:04:11 MST 2020
----------------------------------------------------------------
Initial Request
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Dear MET Help,
Do you know how the variable "A/BAL_WIND_34" is calculated for the full
circle in the tc_pairs executable? Is it an average of the wind radii in
all four quadrants, including quadrants that have a value of 0? Or is an
average of the wind radii in all non-zero quadrants? I assume the a-deck
model and b-deck model wind radii are calculated the same way.
Best,
Gus
--
Ghassan J. Alaka, Jr., Ph.D.
IT Specialist, NOAA/AOML/Hurricane Research Division
4301 Rickenbacker Causeway, Miami. FL 33149
Tel: (305)361-4409 Fax: (305)361-4402
**Opinions expressed in this email are my own and do not represent AOML or
NOAA.**
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Complete Ticket History
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Subject: MET-TC: How is "A/BAL_WIND_34" Calculated?
From: Minna Win
Time: Thu Nov 19 13:10:46 2020
Hello Gus,
I've scoured the User's manual and haven't found the information you
requested. I've asked one of our scientists on the project to see how
the
A/BAL_WIND_34 is calculated.
Regards,
Minna
---------------
Minna Win
National Center for Atmospheric Research
Developmental Testbed Center
Phone: 303-497-8423
Fax: 303-497-8401
---------------
Pronouns: she/her
On Thu, Nov 19, 2020 at 11:04 AM Ghassan Alaka - NOAA Affiliate via RT
<
met_help at ucar.edu> wrote:
>
> Thu Nov 19 11:02:57 2020: Request 97522 was acted upon.
> Transaction: Ticket created by ghassan.alaka at noaa.gov
> Queue: met_help
> Subject: MET-TC: How is "A/BAL_WIND_34" Calculated?
> Owner: Nobody
> Requestors: ghassan.alaka at noaa.gov
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=97522 >
>
>
> Dear MET Help,
>
> Do you know how the variable "A/BAL_WIND_34" is calculated for the
full
> circle in the tc_pairs executable? Is it an average of the wind
radii in
> all four quadrants, including quadrants that have a value of 0? Or
is an
> average of the wind radii in all non-zero quadrants? I assume the a-
deck
> model and b-deck model wind radii are calculated the same way.
>
> Best,
> Gus
>
> --
> Ghassan J. Alaka, Jr., Ph.D.
> IT Specialist, NOAA/AOML/Hurricane Research Division
> 4301 Rickenbacker Causeway, Miami. FL 33149
> Tel: (305)361-4409 Fax: (305)361-4402
>
> **Opinions expressed in this email are my own and do not represent
AOML or
> NOAA.**
>
>
------------------------------------------------
Subject: MET-TC: How is "A/BAL_WIND_34" Calculated?
From: John Halley Gotway
Time: Thu Nov 19 13:35:43 2020
Minna and Gus,
The tc_pairs tool in MET does NOT actually compute the 34 knot wind
radii
values. Instead, it just passes them through from the input ATCF
files, if
present.
Here's a description of the ATCF file format, where those wind radii
are
mentioned:
https://www.nrlmry.navy.mil/atcf_web/docs/database/new/abrdeck.html
You can download some sample track data from NHC to see what I mean:
wget https://ftp.nhc.noaa.gov/atcf/archive/2019/aal012019.dat.gz
If you scroll through the lines of track data points, you'll see that
the
12-th column has values of 0, 34, 50, or 64.
> cat aal012019.dat | awk '{print $12}' | sort -u
0 means that no wind radius info is present. Lines with 34, 50, and 64
give
the corresponding radius of the winds for each of the 4 quadrants
around
the storm. Column 13 defines either full circle winds (AAA) or 4
quadrants (NEQ) starting with the northeast quadrant... I believe
its clockwise from there.
Regardless, this all computed by the tracker software, not MET. You
can
find more info about the GFDL vortex tracker software here:
https://dtcenter.org/community-code/gfdl-vortex-tracker
Thanks,
John Halley Gotway
On Thu, Nov 19, 2020 at 1:11 PM Minna Win via RT <met_help at ucar.edu>
wrote:
>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=97522 >
>
> Hello Gus,
>
> I've scoured the User's manual and haven't found the information you
> requested. I've asked one of our scientists on the project to see
how the
> A/BAL_WIND_34 is calculated.
>
> Regards,
> Minna
> ---------------
> Minna Win
> National Center for Atmospheric Research
> Developmental Testbed Center
> Phone: 303-497-8423
> Fax: 303-497-8401
> ---------------
> Pronouns: she/her
>
>
> On Thu, Nov 19, 2020 at 11:04 AM Ghassan Alaka - NOAA Affiliate via
RT <
> met_help at ucar.edu> wrote:
>
> >
> > Thu Nov 19 11:02:57 2020: Request 97522 was acted upon.
> > Transaction: Ticket created by ghassan.alaka at noaa.gov
> > Queue: met_help
> > Subject: MET-TC: How is "A/BAL_WIND_34" Calculated?
> > Owner: Nobody
> > Requestors: ghassan.alaka at noaa.gov
> > Status: new
> > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=97522 >
> >
> >
> > Dear MET Help,
> >
> > Do you know how the variable "A/BAL_WIND_34" is calculated for the
full
> > circle in the tc_pairs executable? Is it an average of the wind
radii in
> > all four quadrants, including quadrants that have a value of 0? Or
is an
> > average of the wind radii in all non-zero quadrants? I assume the
a-deck
> > model and b-deck model wind radii are calculated the same way.
> >
> > Best,
> > Gus
> >
> > --
> > Ghassan J. Alaka, Jr., Ph.D.
> > IT Specialist, NOAA/AOML/Hurricane Research Division
> > 4301 Rickenbacker Causeway, Miami. FL 33149
> > Tel: (305)361-4409 Fax: (305)361-4402
> >
> > **Opinions expressed in this email are my own and do not represent
AOML
> or
> > NOAA.**
> >
> >
>
>
------------------------------------------------
Subject: MET-TC: How is "A/BAL_WIND_34" Calculated?
From: Ghassan Alaka - NOAA Affiliate
Time: Thu Nov 19 13:51:09 2020
Hi John and Minna,
Thank you for the quick reply. I am very familiar with ATCF files. The
ATCF
files we use have always contained "NEQ", hence my confusion about the
full
circle average. Well, it looks like my colleague added a calculation
to do
this in our script that post-processes the MET-TC output. The script
averages all non-missing wind radii into the full circle average.
Sorry for
the confusion. Thank you very much for helping me do this!
Best,
Gus
--
Ghassan J. Alaka, Jr., Ph.D.
IT Specialist, NOAA/AOML/Hurricane Research Division
4301 Rickenbacker Causeway, Miami. FL 33149
Tel: (305)361-4409 Fax: (305)361-4402
**Opinions expressed in this email are my own and do not represent
AOML or
NOAA.**
On Thu, Nov 19, 2020 at 3:35 PM John Halley Gotway via RT
<met_help at ucar.edu>
wrote:
> Minna and Gus,
>
> The tc_pairs tool in MET does NOT actually compute the 34 knot wind
radii
> values. Instead, it just passes them through from the input ATCF
files, if
> present.
>
> Here's a description of the ATCF file format, where those wind radii
are
> mentioned:
> https://www.nrlmry.navy.mil/atcf_web/docs/database/new/abrdeck.html
>
> You can download some sample track data from NHC to see what I mean:
> wget https://ftp.nhc.noaa.gov/atcf/archive/2019/aal012019.dat.gz
>
> If you scroll through the lines of track data points, you'll see
that the
> 12-th column has values of 0, 34, 50, or 64.
>
> > cat aal012019.dat | awk '{print $12}' | sort -u
>
> 0 means that no wind radius info is present. Lines with 34, 50, and
64 give
> the corresponding radius of the winds for each of the 4 quadrants
around
> the storm. Column 13 defines either full circle winds (AAA) or 4
> quadrants (NEQ) starting with the northeast quadrant... I believe
> its clockwise from there.
>
> Regardless, this all computed by the tracker software, not MET. You
can
> find more info about the GFDL vortex tracker software here:
> https://dtcenter.org/community-code/gfdl-vortex-tracker
>
> Thanks,
> John Halley Gotway
>
> On Thu, Nov 19, 2020 at 1:11 PM Minna Win via RT <met_help at ucar.edu>
> wrote:
>
> >
> > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=97522 >
> >
> > Hello Gus,
> >
> > I've scoured the User's manual and haven't found the information
you
> > requested. I've asked one of our scientists on the project to see
how
> the
> > A/BAL_WIND_34 is calculated.
> >
> > Regards,
> > Minna
> > ---------------
> > Minna Win
> > National Center for Atmospheric Research
> > Developmental Testbed Center
> > Phone: 303-497-8423
> > Fax: 303-497-8401
> > ---------------
> > Pronouns: she/her
> >
> >
> > On Thu, Nov 19, 2020 at 11:04 AM Ghassan Alaka - NOAA Affiliate
via RT <
> > met_help at ucar.edu> wrote:
> >
> > >
> > > Thu Nov 19 11:02:57 2020: Request 97522 was acted upon.
> > > Transaction: Ticket created by ghassan.alaka at noaa.gov
> > > Queue: met_help
> > > Subject: MET-TC: How is "A/BAL_WIND_34" Calculated?
> > > Owner: Nobody
> > > Requestors: ghassan.alaka at noaa.gov
> > > Status: new
> > > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=97522
> >
> > >
> > >
> > > Dear MET Help,
> > >
> > > Do you know how the variable "A/BAL_WIND_34" is calculated for
the full
> > > circle in the tc_pairs executable? Is it an average of the wind
radii
> in
> > > all four quadrants, including quadrants that have a value of 0?
Or is
> an
> > > average of the wind radii in all non-zero quadrants? I assume
the
> a-deck
> > > model and b-deck model wind radii are calculated the same way.
> > >
> > > Best,
> > > Gus
> > >
> > > --
> > > Ghassan J. Alaka, Jr., Ph.D.
> > > IT Specialist, NOAA/AOML/Hurricane Research Division
> > > 4301 Rickenbacker Causeway, Miami. FL 33149
> > > Tel: (305)361-4409 Fax: (305)361-4402
> > >
> > > **Opinions expressed in this email are my own and do not
represent AOML
> > or
> > > NOAA.**
> > >
> > >
> >
> >
>
>
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