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Subject: Degrib 1.68
From: Arthur Taylor
Date: Wed, 30 Mar 2005 14:27:25 -0500
To: arthur.taylor@noaa.gov

Hi everyone,

You all have the unique distinction of being registered on my degrib aka NDFD_GRIB2Decoder) mailing list (all 696 of us) (I'd like to welcome: aaz, jkp, n9oew, stephen.r.baig, bibiana.groppelli, mreynolds, dc8cappie, exu, kuanmet, ivanr, craig_buchanan, ben, j_oxtoby, rucarden, lnb, robd, bradl1rj, ekearns, jhorel, msnow, angelo.b, rakarmes, jjtasso, edward_L_bensman, rainer.behrendt, greg.parrott, kevin.jacobs, BrandonMoore)

I'd also like to say a special hello to Stephen Baig who works with me on hurricane storm surge at the NHC, and to jhorel "the expert" on the ADAS analysis (useful in gridded verification).

Please let me know (email me) if you want to unregister. The latest version of the program is on: www.nws.noaa.gov/mdl/NDFD_GRIB2Decoder/ (or www.nws.noaa.gov/mdl/degrib/).

----------- General News.

Very shortly the NDGD will be expanding to include Gridded Model Output Statistics (MOS). As soon as it is available on the ftp/http sites, I will send out a new version of degrib configured with its location.

Be advised that due to some of the issues Gridded MOS raised, we will probably see the Air Quality URL restructured in the near term. Also, in the long term, we could eventually see NDFD's URL change. I'm sure a lot more will be said about those changes via other channels if/when it happens.

----------- News about this release:

I have just finished putting together version "1.68" (last one that I announced was "1.67" on 3/15/2005).

This release is mainly focused on handling Gridded MOS, and probabilistic hurricane wind fields, as well as some bug fixes.

1) Upgraded to version 1.0.2 of NCEP's C version of their GRIB2 library.

2) When creating the "element name", degrib now checks if the center = 7, subcenter = 14 (MDL), in which case it prepends either "MOS-" or "MOSGFS-", depending on the Generation ID number. Example MaxT becomes MOSGFS-MaxT

3) When creating the "element name", degrib now checks if the data was from a probability template (4.5 or 4.9). If so, it prepends "PROB-". Thus probability of wind exceeding a value becomes "PROB-WIND" instead of "WIND" (exception: PoP12 is still labeled PoP12 instead of PROB-APCP (accumulated precip)).

4) When creating the "comment name" for probability data, degrib now looks at the threshold values. Example: "Prob of Wind speed > 25.770000 m/s [%]". Note: I may want to add threshold info to the "element name" for probability data.

5) Thanks to rainer.behrendt reporting that I was off by a day when the program was run on GFS model .5 degree data in Germany, I was able to fix the method used to determine the timezone.

6) Thanks to rainer.behrendt reporting that there was a north / south swap when working with the GFS model .5 degree data, I was able to find an unexpected grid specification. (I had expected Lat1/Lon1 to be the lower left corner and Lat2/Lon2 to be the upper right corner when given a lat/lon grid. In actuality they gave upper left and lower right respectively.)

7) Added handling of template 4.5 (probability of an event at a point in time) before further discussion with TPC ultimately led to template 4.9 (probability of an event over a given time range).

-----------

Please let me know if you have problems.

Regards,
Arthur

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    Page last Modified: August 10, 2009.
Degrib Questions? Arthur Taylor
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