NOAA / NWS's Meteorological Development Laboratory
Degrib (NDFD GRIB2 Decoder)
Date: Mon, 4 Jun 2012 04:00:00 -0400 (EDT)
---- DRAFT ----
You are amongst the degrib users registered on the degrib update mailing
list. We are moving to using gov.delivery and an RSS feed to disseminate
notes. Expect a similar email from gov.delivery to test out the new
system and allow you to opt out.
The lastest version of degrib is 1.98 and can be downloaded from
The focus of release 1.98 is:
A) To introduce the -StormTotal option. This was added to the list
of Command Level options (-I, -C, ...) and responds to the need for storm
total precipitation. Its purpose is to create a new grid based on adding the
values from several different messages together. It is currently intended to
work with QPF, SnowAmt, and IceAccum grids.
Messages are selected by providing a -startTime and an -endTime. These times
are exclusive, so -startTime '2012-05-25T01:00:00' will not include the
message valid at 06Z for the time frame between 00Z to 06Z on the 5th whereas
'2012-05-25T00:00:00' will. Extra care is required with -startTime since the
Inventory (-I) option provides the end of the time period, so you need to be
aware of the time duration of the data. If the Inventory says the date of the
message is 06Z and the duration of the data is 6 hours, you'd need 00Z or
earlier in the -startTime to include that message.
The user may include an optional CONVERT OPTION (-Grib2, etc.). So:
degrib foo.bin -StormTotal -startTime "05/27/2012 00:00:00" -endTime
"5/28/2012 18:00:00" -Grib2
will create a new GRIB file with a single message which totalled the values
from 0Z on 5/27 to 18Z on 5/28.
B) To update 'dwmllib' to include support for MinRH and MaxRH. Paul
(firstname.lastname@example.org) would appreciate any feedback you may have
Please let me know if you have problems.