NOAA / NWS's Meteorological Development Laboratory
Degrib (NDFD GRIB2 Decoder)
Subject: Degrib 1.81
Date: Thu, 31 Aug 2006 17:27:00 -0400
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----------- General News (see:http://www.nws.noaa.gov/om/notif.htm)
TIN05-56 AMENDED: Let us know that on 8/15/2006, the Gridded MOS in the
NDGD went from the expr directory to the opnl directory. In addition,
they added Wind Speed, Wind Direction, Probability of Thunderstorms over
3, 6 and 12 hours.
TIN06-14: Let us know that on 8/8/2006, the Localized Aviation MOS
Program began providing gridded thunderstorm products: (probability of
thunderstorms in a 2 hour period, and thunderstorm occurrence
TIN06-24 AMENDED: Let us know that on 8/22/2006, we should expect RTMA
data in /SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.rtma/AR.conus.
Unfortunately that directory (as of the time of this email) appears to
be empty. My hypothesis is that they are supposed to populate
RT.000000, RT.010000, RT.020000, ... RT.230000 sub directories of
AR.conus, which don't currently exist, and that the Critical Weather
days from Ernesto are hindering a resolution to this.
TIN06-39: Let us know that on 9/6/2006 NDFD element files will be split
into 2 files. One for days 1 to 3, and the other for days 4 to 7.
NOTE: There will be no overlap! The data will be in the "old" directory
one hour, and the next it will be gone from there and in the VP.001-003,
TIN06-54: Let us know that on 9/6/2006 Alaska elements (max, min, pop12,
wind direction, wind speed, and wave height) will become experimental.
TIN06-55: Let us know that on 9/6/2006 Wind Gust will be added to the
NDFD as an experimental variable.
----------- News about this release:
I have just finished putting together version "1.81" (last one that I
announced was "1.80" on 7/17/2006).
This release focused primarily on adding support for splitting the NDFD
into 2 files (a day 1 to 3 and a day 4 to 7).
1) To support the splitting of the NDFD into days 1-3 and days 4-7, a
redesign of the control file "ndfd.ini" was required. That in turn
meant that the Tcl/Tk portion of "tkdegrib" and "web.tcl" had to be
rewritten. Unfortunately I didn't have time to re-enable all the
features of tkdegrib, which means that currently the configuration
options, and the calls to the image generation code have been disabled.
1a) The general concept was to provide BOTH a day 1-7 option as well as
days 1-3 and days 4-7 options. The way the day 1-7 option works is it
joins together all the currently available information. So it appends
the days 1-3 file with the days 4-7 file. NOTE: Such a day 1-7 file can
result in a mixture of reference times.
1b) In theory the days 1-7 option will work seamlessly over the Sep 6
change over. It will first try to find the data in the original place,
and when it doesn't find it there, it will look in the VP.001-003 and
VP.004-007 subdirectories. After Sep 6, I will release a version which
no longer looks in the "non-VP" directories.
1c) In addition, since the control file (ndfd.ini) had to be changed, I
had to rewrite "web.tcl". This allowed an opportunity to switch the
calling method from order dependent to option dependent so that I could
make it more flexible and add some options. If you have problems, see
"tcldegrib web.tcl -help".
1d) While I was at it, I updated ndfd.ini with the current locations of
the gridded MOS data, and the gridded LAMP data. In addition, I've
introduced the experimental data for Alaska (which won't be available
until Sep 6).
1e) Some minor modifications were also needed to get WindGust to use the
NDFD naming and unit conventions. NOTE: This could affect the decoding
of "GUST" products from NCEP, as the default unit had been the GRIB2
encoding "m/s2", rather than the English unit of "knots". To get the
old behavior back use "-Unit none".
2) Thanks to Paul Hershberg, degrib can now generate the remaining two
DWML products. Specifically the dwml_byday (12 or 24-hour) options.
-XML should now respond to 4 different output flavors of XML (as opposed
to just time-series or glance).
3) Thanks to comments from NHC, I've reduced the plethora of download
packages to hopefully reduce confusion, and have attempted to "clean up"
the GIS tab slightly.
4) Modified the -Data option to handle multiple files on the command
line when creating a "data cube".
5) Fixed a bug introduced in the tdlpack code in version 1.79, and 1.80.
6) Thanks to Nat, I found out that my "dataloc.php" page was out of
date, and have updated it.
Please let me know if you have problems.
GOOD LUCK TO ALL ON SEP 6!!