HYSPLIT Forum: hysplitbbs.arl.noaa.gov

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

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.

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
...