Using hourly GFS in HYSPLIT

[rsargent]

We're wanting to use GFS with HYSPLIT. We can download for example https://nomads.ncep.noaa.gov/pub/data/n ... fs0p25f000, but we observe the met snapshots are 3 hours each, while we'd like to instead use the more granular hourly data that we see in GRIB2 format for example https://nomads.ncep.noaa.gov/pub/data/n ... .0p25.f000.

When we've tried using api2arl_v4, with GRIB2 files like the above, we seem to create a very-different looking ARL output, with different met model, different vertical grid size, and different data:

Using HYSPLIT's chk_file utility, here are some of the differences in boldface:

Downloaded 3-hour HYSPLIT format:
Meteo data model : GFSQ
Grid size x,y,z : 1440 721 56
Global meteorology grid
56 13.0000 6 TEMP 142 UWND 88 VWND 206 WWND 41 RELH 160 PRES 60
55 16.0000 6 TEMP 121 UWND 88 VWND 48 WWND 72 RELH 99 PRES 60
…

Using api2arl_v4 from the hourly GRIB2:
Meteo data model : kwbc
Grid size x,y,z : 1440 721 24
Global meteorology grid
24 70.0000 7 HGTS 226 TEMP 52 UWND 203 VWND 27 WWND 168 RELH 96 SPHU 95
23 50.0000 7 HGTS 252 TEMP 239 UWND 37 VWND 199 WWND 14 RELH 138 SPHU 55
…

Is there a recipe for more correctly using api2arl_v4? Or is there some reason it's inadvisable to use the hourly GFS with HYSPLIT?

Best,
Randy

Randy Sargent
Director of Visualization
Carnegie Mellon CREATE Lab

[mtomy2008]

Can anyone answer this questiondownload lagu? I'm looking for a solution because I have the same problem. If anyone has one, please tag me. Thanks a lot.

[x.sun]

I'm using api2arl_v6 and it doesn't seem to have a problem:
$ rm *.cfg
$ api2arl_v6 -z1 -igfs.t12z.pgrb2.0p25.f001 -of001.arl
$ rm *.cfg
$ api2arl_v6 -z1 -igfs.t12z.pgrb2.0p25.f006 -of006.arl

chk_file output for f001.arl:

WARNING metset: Only one time period of meteo data
File start time: 24 3 11 13 0
File ending time: 24 3 11 13 0
Last record number : 175
Record length bytes: 1038290
Meteo data model : kwbc
Grid size x,y,z : 1440 721 24
Vertical coordinate: 2
First forecast hour: 1
Last forecast hour : 1
Records per time : 175
Minutes between : 1
Pole pnt lat/lon : 90.0000 359.7500
Reference lat/lon: 0.2500 0.2500
Grid size (km) : 27.7996
Orientation : 0.0000
Tang Lat / Cone : 0.0000
Synch pnt x,y : 1.0000 1.0000
Synch pnt lat/lon: -90.0000 0.0000
Global meteorology grid
24 50.0000 7 HGTS 92 TEMP 49 UWND 232 VWND 209 WWND 66 RELH 44 SPHU 75
23 70.0000 7 HGTS 156 TEMP 123 UWND 67 VWND 60 WWND 64 RELH 236 SPHU 254
...

for f006.arl:
WARNING metset: Only one time period of meteo data
File start time: 24 3 11 18 0
File ending time: 24 3 11 18 0
Last record number : 175
Record length bytes: 1038290
Meteo data model : kwbc
Grid size x,y,z : 1440 721 24
Vertical coordinate: 2
First forecast hour: 6
Last forecast hour : 6
Records per time : 175
Minutes between : 1
Pole pnt lat/lon : 90.0000 359.7500
Reference lat/lon: 0.2500 0.2500
Grid size (km) : 27.7996
Orientation : 0.0000
Tang Lat / Cone : 0.0000
Synch pnt x,y : 1.0000 1.0000
Synch pnt lat/lon: -90.0000 0.0000
Global meteorology grid
24 50.0000 7 HGTS 161 TEMP 85 UWND 204 VWND 243 WWND 65 RELH 252 SPHU 115
23 70.0000 7 HGTS 254 TEMP 221 UWND 76 VWND 43 WWND 109 RELH 136 SPHU 109
...