kerchunk: Variables missing from 'scan_grib', but findable with xarray and cfgrib

I’m encountering an interesting issue where the results of scan_grib differ from interacting with a file via xarray/cfgrib. Particularly, it is not detecting certain variables. Installation information:

Python 3.11.0 | packaged by conda-forge | (main, Jan 14 2023, 12:27:40) [GCC 11.3.0] on linux
kerchunk.__version__ : '0.2.0'
cfgrib.__version__: '0.9.10.4'
xarray.__version__: '2023.5.0'

In this particular case, the missing variable is the 10 meter V wind component. Using scan_grib:

filter_stn10 = {"typeOfLevel":"heightAboveGround",  "level":10 }
gribfile = "./2021/anl/rap_252_20210415_0000_000.grb2"
scan = scan_grib(gribfile, filter=filter_stn10)
mzz = MultiZarrToZarr(scan,
    preprocess=drop(("time", "step")),
    concat_dims = ["heightAboveGround"],
    identical_dims=['latitude', 'longitude'])
d = mzz.translate()
fs = fsspec.filesystem("reference", fo=d)
m = fs.get_mapper("")
ds = xr.open_dataset(m, engine="zarr")
print(ds)

...
<xarray.Dataset>
Dimensions:            (heightAboveGround: 1, y: 225, x: 301, valid_time: 1)
Coordinates:
  * heightAboveGround  (heightAboveGround) int64 10
  * valid_time         (valid_time) datetime64[ns] 2021-04-15
Dimensions without coordinates: y, x
Data variables:
    latitude           (y, x) float64 ...
    longitude          (y, x) float64 ...
    u10                (heightAboveGround, y, x) float64 ...
Attributes:
    centre:             kwbc
    centreDescription:  US National Weather Service - NCEP
    edition:            2
    subCentre:          0

As you can see, there is no v10 variable output. Here’s the printed output directly from scan_grib, showing that the data is missing here too:

[{'version': 1, 'refs': {'.zgroup': '{"zarr_format":2}', '.zattrs': '{"centre":"kwbc","centreDescription":"US National Weather Service - NCEP","edition":2,"subCentre":0}', 'u10/.zarray': '{"chunks":[225,301],"compressor":null,"dtype":"<f8","fill_value":3.4028234663852886e+38,"filters":[{"dtype":"float64","id":"grib","var":"u10"}],"order":"C","shape":[225,301],"zarr_format":2}', 'u10/0.0': ['{{u}}', 6501899, 70814], 'u10/.zattrs': '{"NV":0,"_ARRAY_DIMENSIONS":["y","x"],"cfName":"eastward_wind","cfVarName":"u10","dataDate":20210415,"dataTime":0,"dataType":"fc","endStep":0,"gridDefinitionDescription":"Lambert Conformal can be secant or tangent, conical or bipolar","gridType":"lambert","missingValue":3.4028234663852886e+38,"name":"10 metre U wind component","numberOfPoints":67725,"paramId":165,"shortName":"10u","stepType":"instant","stepUnits":1,"typeOfLevel":"heightAboveGround","units":"m s**-1"}', 'heightAboveGround/.zarray': '{"chunks":[1],"compressor":null,"dtype":"<i8","fill_value":null,"filters":null,"order":"C","shape":[1],"zarr_format":2}', 'heightAboveGround/0': '\n\x00\x00\x00\x00\x00\x00\x00', 'heightAboveGround/.zattrs': '{"_ARRAY_DIMENSIONS":["heightAboveGround"],"long_name":"height above the surface","positive":"up","standard_name":"height","units":"m"}', 'latitude/.zarray': '{"chunks":[225,301],"compressor":null,"dtype":"<f8","fill_value":null,"filters":[{"dtype":"float64","id":"grib","var":"latitude"}],"order":"C","shape":[225,301],"zarr_format":2}', 'latitude/0.0': ['{{u}}', 6501899, 70814], 'latitude/.zattrs': '{"_ARRAY_DIMENSIONS":["y","x"],"long_name":"latitude","standard_name":"latitude","units":"degrees_north"}', 'longitude/.zarray': '{"chunks":[225,301],"compressor":null,"dtype":"<f8","fill_value":null,"filters":[{"dtype":"float64","id":"grib","var":"longitude"}],"order":"C","shape":[225,301],"zarr_format":2}', 'longitude/0.0': ['{{u}}', 6501899, 70814], 'longitude/.zattrs': '{"_ARRAY_DIMENSIONS":["y","x"],"long_name":"longitude","standard_name":"longitude","units":"degrees_east"}', 'step/.zarray': '{"chunks":[1],"compressor":null,"dtype":"<f8","fill_value":null,"filters":null,"order":"C","shape":[1],"zarr_format":2}', 'step/0': '\x00\x00\x00\x00\x00\x00\x00\x00', 'step/.zattrs': '{"_ARRAY_DIMENSIONS":["step"],"long_name":"time since forecast_reference_time","standard_name":"forecast_period","units":"hours"}', 'time/.zarray': '{"chunks":[1],"compressor":null,"dtype":"<i8","fill_value":null,"filters":null,"order":"C","shape":[1],"zarr_format":2}', 'time/0': 'base64:AIJ3YAAAAAA=', 'time/.zattrs': '{"_ARRAY_DIMENSIONS":["time"],"calendar":"proleptic_gregorian","long_name":"initial time of forecast","standard_name":"forecast_reference_time","units":"seconds since 1970-01-01T00:00:00"}', 'valid_time/.zarray': '{"chunks":[1],"compressor":null,"dtype":"<i8","fill_value":null,"filters":null,"order":"C","shape":[1],"zarr_format":2}', 'valid_time/0': 'base64:AIJ3YAAAAAA=', 'valid_time/.zattrs': '{"_ARRAY_DIMENSIONS":["valid_time"],"calendar":"proleptic_gregorian","long_name":"time","standard_name":"time","units":"seconds since 1970-01-01T00:00:00"}'}, 'templates': {'u': './2021/anl/rap_252_20210415_0000_000.grb2'}}]

However, when I use xarray/cfgrib, the v10 variable is present and accounted for:

ds = xr.open_dataset(gribfile, engine="cfgrib", backend_kwargs={'filter_by_keys': filter_stn10})
print(ds)
...
<xarray.Dataset>
Dimensions:            (y: 225, x: 301)
Coordinates:
    time               datetime64[ns] ...
    step               timedelta64[ns] ...
    heightAboveGround  float64 ...
    latitude           (y, x) float64 ...
    longitude          (y, x) float64 ...
    valid_time         datetime64[ns] ...
Dimensions without coordinates: y, x
Data variables:
    u10                (y, x) float32 ...
    v10                (y, x) float32 ...
Attributes:
    GRIB_edition:            2
    GRIB_centre:             kwbc
    GRIB_centreDescription:  US National Weather Service - NCEP
    GRIB_subCentre:          0
    Conventions:             CF-1.7
    institution:             US National Weather Service - NCEP
    history:                 2023-09-08T16:40 GRIB to CDM+CF via cfgrib-0.9.1...

Output from wgrib2:

1:0:d=2021041500:REFC:entire atmosphere:anl:
2:26161:d=2021041500:VIS:surface:anl:
3:76622:d=2021041500:REFD:1000 m above ground:anl:
4:91602:d=2021041500:REFD:4000 m above ground:anl:
5:103208:d=2021041500:HGT:planetary boundary layer:anl:
6:200740:d=2021041500:GUST:surface:anl:
7:238099:d=2021041500:RETOP:entire atmosphere (considered as a single layer):anl:
8:267373:d=2021041500:HGT:100 mb:anl:
9:299862:d=2021041500:TMP:100 mb:anl:
10:316121:d=2021041500:RH:100 mb:anl:
11:327509:d=2021041500:VVEL:100 mb:anl:
12.1:335559:d=2021041500:UGRD:100 mb:anl:
12.2:335559:d=2021041500:VGRD:100 mb:anl:
13:374100:d=2021041500:HGT:125 mb:anl:
14:406398:d=2021041500:TMP:125 mb:anl:
15:423480:d=2021041500:RH:125 mb:anl:
16:436337:d=2021041500:VVEL:125 mb:anl:
17.1:446670:d=2021041500:UGRD:125 mb:anl:
17.2:446670:d=2021041500:VGRD:125 mb:anl:
18:486922:d=2021041500:HGT:150 mb:anl:
19:519400:d=2021041500:TMP:150 mb:anl:
20:537730:d=2021041500:RH:150 mb:anl:
21:553822:d=2021041500:VVEL:150 mb:anl:
22.1:565648:d=2021041500:UGRD:150 mb:anl:
22.2:565648:d=2021041500:VGRD:150 mb:anl:
23:608532:d=2021041500:HGT:175 mb:anl:
24:641616:d=2021041500:TMP:175 mb:anl:
25:660500:d=2021041500:RH:175 mb:anl:
26:681375:d=2021041500:VVEL:175 mb:anl:
27.1:694368:d=2021041500:UGRD:175 mb:anl:
27.2:694368:d=2021041500:VGRD:175 mb:anl:
28:738113:d=2021041500:HGT:200 mb:anl:
29:772347:d=2021041500:TMP:200 mb:anl:
30:790862:d=2021041500:RH:200 mb:anl:
31:817088:d=2021041500:VVEL:200 mb:anl:
32.1:831054:d=2021041500:UGRD:200 mb:anl:
32.2:831054:d=2021041500:VGRD:200 mb:anl:
33:876274:d=2021041500:HGT:225 mb:anl:
34:910505:d=2021041500:TMP:225 mb:anl:
35:928298:d=2021041500:RH:225 mb:anl:
36:958969:d=2021041500:VVEL:225 mb:anl:
37.1:974641:d=2021041500:UGRD:225 mb:anl:
37.2:974641:d=2021041500:VGRD:225 mb:anl:
38:1021922:d=2021041500:HGT:250 mb:anl:
39:1055864:d=2021041500:TMP:250 mb:anl:
40:1073010:d=2021041500:RH:250 mb:anl:
41:1107102:d=2021041500:VVEL:250 mb:anl:
42.1:1124398:d=2021041500:UGRD:250 mb:anl:
42.2:1124398:d=2021041500:VGRD:250 mb:anl:
43:1173425:d=2021041500:HGT:275 mb:anl:
44:1207228:d=2021041500:TMP:275 mb:anl:
45:1223656:d=2021041500:RH:275 mb:anl:
46:1258875:d=2021041500:VVEL:275 mb:anl:
47.1:1277338:d=2021041500:UGRD:275 mb:anl:
47.2:1277338:d=2021041500:VGRD:275 mb:anl:
48:1325698:d=2021041500:HGT:300 mb:anl:
49:1358872:d=2021041500:TMP:300 mb:anl:
50:1375309:d=2021041500:RH:300 mb:anl:
51:1412409:d=2021041500:VVEL:300 mb:anl:
52.1:1431873:d=2021041500:UGRD:300 mb:anl:
52.2:1431873:d=2021041500:VGRD:300 mb:anl:
53:1481013:d=2021041500:HGT:325 mb:anl:
54:1513807:d=2021041500:TMP:325 mb:anl:
55:1530216:d=2021041500:RH:325 mb:anl:
56:1568118:d=2021041500:VVEL:325 mb:anl:
57.1:1588258:d=2021041500:UGRD:325 mb:anl:
57.2:1588258:d=2021041500:VGRD:325 mb:anl:
58:1637414:d=2021041500:HGT:350 mb:anl:
59:1669796:d=2021041500:TMP:350 mb:anl:
60:1686108:d=2021041500:RH:350 mb:anl:
61:1724086:d=2021041500:VVEL:350 mb:anl:
62.1:1744937:d=2021041500:UGRD:350 mb:anl:
62.2:1744937:d=2021041500:VGRD:350 mb:anl:
63:1793360:d=2021041500:HGT:375 mb:anl:
64:1825237:d=2021041500:TMP:375 mb:anl:
65:1841628:d=2021041500:RH:375 mb:anl:
66:1879492:d=2021041500:VVEL:375 mb:anl:
67.1:1900565:d=2021041500:UGRD:375 mb:anl:
67.2:1900565:d=2021041500:VGRD:375 mb:anl:
68:1948191:d=2021041500:HGT:400 mb:anl:
69:1979803:d=2021041500:TMP:400 mb:anl:
70:1996163:d=2021041500:RH:400 mb:anl:
71:2033781:d=2021041500:VVEL:400 mb:anl:
72.1:2055147:d=2021041500:UGRD:400 mb:anl:
72.2:2055147:d=2021041500:VGRD:400 mb:anl:
73:2101958:d=2021041500:HGT:425 mb:anl:
74:2133393:d=2021041500:TMP:425 mb:anl:
75:2150030:d=2021041500:RH:425 mb:anl:
76:2187451:d=2021041500:VVEL:425 mb:anl:
77.1:2208831:d=2021041500:UGRD:425 mb:anl:
77.2:2208831:d=2021041500:VGRD:425 mb:anl:
78:2255515:d=2021041500:HGT:450 mb:anl:
79:2286390:d=2021041500:TMP:450 mb:anl:
80:2303182:d=2021041500:RH:450 mb:anl:
81:2341090:d=2021041500:VVEL:450 mb:anl:
82.1:2362485:d=2021041500:UGRD:450 mb:anl:
82.2:2362485:d=2021041500:VGRD:450 mb:anl:
83:2409552:d=2021041500:HGT:475 mb:anl:
84:2439985:d=2021041500:TMP:475 mb:anl:
85:2456849:d=2021041500:RH:475 mb:anl:
86:2494921:d=2021041500:VVEL:475 mb:anl:
87.1:2516387:d=2021041500:UGRD:475 mb:anl:
87.2:2516387:d=2021041500:VGRD:475 mb:anl:
88:2562680:d=2021041500:HGT:500 mb:anl:
89:2593117:d=2021041500:TMP:500 mb:anl:
90:2609777:d=2021041500:RH:500 mb:anl:
91:2647424:d=2021041500:VVEL:500 mb:anl:
92.1:2668671:d=2021041500:UGRD:500 mb:anl:
92.2:2668671:d=2021041500:VGRD:500 mb:anl:
93:2713923:d=2021041500:ABSV:500 mb:anl:
94:2746037:d=2021041500:HGT:525 mb:anl:
95:2776012:d=2021041500:TMP:525 mb:anl:
96:2792992:d=2021041500:RH:525 mb:anl:
97:2831347:d=2021041500:VVEL:525 mb:anl:
98.1:2852812:d=2021041500:UGRD:525 mb:anl:
98.2:2852812:d=2021041500:VGRD:525 mb:anl:
99:2898821:d=2021041500:HGT:550 mb:anl:
100:2928968:d=2021041500:TMP:550 mb:anl:
101:2945598:d=2021041500:RH:550 mb:anl:
102:2983308:d=2021041500:VVEL:550 mb:anl:
103.1:3004714:d=2021041500:UGRD:550 mb:anl:
103.2:3004714:d=2021041500:VGRD:550 mb:anl:
104:3049897:d=2021041500:HGT:575 mb:anl:
105:3079709:d=2021041500:TMP:575 mb:anl:
106:3096752:d=2021041500:RH:575 mb:anl:
107:3135210:d=2021041500:VVEL:575 mb:anl:
108.1:3156734:d=2021041500:UGRD:575 mb:anl:
108.2:3156734:d=2021041500:VGRD:575 mb:anl:
109:3202819:d=2021041500:HGT:600 mb:anl:
110:3232685:d=2021041500:TMP:600 mb:anl:
111:3249719:d=2021041500:RH:600 mb:anl:
112:3287641:d=2021041500:VVEL:600 mb:anl:
113.1:3309175:d=2021041500:UGRD:600 mb:anl:
113.2:3309175:d=2021041500:VGRD:600 mb:anl:
114:3354562:d=2021041500:HGT:625 mb:anl:
115:3384078:d=2021041500:TMP:625 mb:anl:
116:3401681:d=2021041500:RH:625 mb:anl:
117:3440059:d=2021041500:VVEL:625 mb:anl:
118.1:3461817:d=2021041500:UGRD:625 mb:anl:
118.2:3461817:d=2021041500:VGRD:625 mb:anl:
119:3508232:d=2021041500:HGT:650 mb:anl:
120:3537878:d=2021041500:TMP:650 mb:anl:
121:3555657:d=2021041500:RH:650 mb:anl:
122:3593791:d=2021041500:VVEL:650 mb:anl:
123.1:3615582:d=2021041500:UGRD:650 mb:anl:
123.2:3615582:d=2021041500:VGRD:650 mb:anl:
124:3661703:d=2021041500:HGT:675 mb:anl:
125:3691143:d=2021041500:TMP:675 mb:anl:
126:3709488:d=2021041500:RH:675 mb:anl:
127:3748175:d=2021041500:VVEL:675 mb:anl:
128.1:3770420:d=2021041500:UGRD:675 mb:anl:
128.2:3770420:d=2021041500:VGRD:675 mb:anl:
129:3817288:d=2021041500:HGT:700 mb:anl:
130:3846777:d=2021041500:TMP:700 mb:anl:
131:3865409:d=2021041500:RH:700 mb:anl:
132:3903940:d=2021041500:VVEL:700 mb:anl:
133.1:3926267:d=2021041500:UGRD:700 mb:anl:
133.2:3926267:d=2021041500:VGRD:700 mb:anl:
134:3973264:d=2021041500:HGT:725 mb:anl:
135:4002869:d=2021041500:TMP:725 mb:anl:
136:4021904:d=2021041500:RH:725 mb:anl:
137:4060819:d=2021041500:VVEL:725 mb:anl:
138.1:4083328:d=2021041500:UGRD:725 mb:anl:
138.2:4083328:d=2021041500:VGRD:725 mb:anl:
139:4130998:d=2021041500:HGT:750 mb:anl:
140:4160663:d=2021041500:TMP:750 mb:anl:
141:4180313:d=2021041500:RH:750 mb:anl:
142:4219649:d=2021041500:VVEL:750 mb:anl:
143.1:4242537:d=2021041500:UGRD:750 mb:anl:
143.2:4242537:d=2021041500:VGRD:750 mb:anl:
144:4290730:d=2021041500:HGT:775 mb:anl:
145:4320791:d=2021041500:TMP:775 mb:anl:
146:4340824:d=2021041500:RH:775 mb:anl:
147:4380169:d=2021041500:VVEL:775 mb:anl:
148.1:4403481:d=2021041500:UGRD:775 mb:anl:
148.2:4403481:d=2021041500:VGRD:775 mb:anl:
149:4451919:d=2021041500:HGT:800 mb:anl:
150:4482100:d=2021041500:TMP:800 mb:anl:
151:4502707:d=2021041500:RH:800 mb:anl:
152:4542641:d=2021041500:VVEL:800 mb:anl:
153.1:4566246:d=2021041500:UGRD:800 mb:anl:
153.2:4566246:d=2021041500:VGRD:800 mb:anl:
154:4615301:d=2021041500:HGT:825 mb:anl:
155:4645730:d=2021041500:TMP:825 mb:anl:
156:4666719:d=2021041500:RH:825 mb:anl:
157:4706917:d=2021041500:VVEL:825 mb:anl:
158.1:4730846:d=2021041500:UGRD:825 mb:anl:
158.2:4730846:d=2021041500:VGRD:825 mb:anl:
159:4779668:d=2021041500:HGT:850 mb:anl:
160:4810539:d=2021041500:TMP:850 mb:anl:
161:4832050:d=2021041500:RH:850 mb:anl:
162:4873044:d=2021041500:VVEL:850 mb:anl:
163.1:4897355:d=2021041500:UGRD:850 mb:anl:
163.2:4897355:d=2021041500:VGRD:850 mb:anl:
164:4945786:d=2021041500:HGT:875 mb:anl:
165:4977212:d=2021041500:TMP:875 mb:anl:
166:4999438:d=2021041500:RH:875 mb:anl:
167:5041862:d=2021041500:VVEL:875 mb:anl:
168.1:5066347:d=2021041500:UGRD:875 mb:anl:
168.2:5066347:d=2021041500:VGRD:875 mb:anl:
169:5114561:d=2021041500:HGT:900 mb:anl:
170:5146580:d=2021041500:TMP:900 mb:anl:
171:5169539:d=2021041500:RH:900 mb:anl:
172:5212900:d=2021041500:VVEL:900 mb:anl:
173.1:5237345:d=2021041500:UGRD:900 mb:anl:
173.2:5237345:d=2021041500:VGRD:900 mb:anl:
174:5285710:d=2021041500:HGT:925 mb:anl:
175:5318772:d=2021041500:TMP:925 mb:anl:
176:5342361:d=2021041500:RH:925 mb:anl:
177:5385536:d=2021041500:VVEL:925 mb:anl:
178.1:5409454:d=2021041500:UGRD:925 mb:anl:
178.2:5409454:d=2021041500:VGRD:925 mb:anl:
179:5458125:d=2021041500:HGT:950 mb:anl:
180:5492552:d=2021041500:TMP:950 mb:anl:
181:5516493:d=2021041500:RH:950 mb:anl:
182:5559001:d=2021041500:VVEL:950 mb:anl:
183.1:5581810:d=2021041500:UGRD:950 mb:anl:
183.2:5581810:d=2021041500:VGRD:950 mb:anl:
184:5630669:d=2021041500:HINDEX:surface:anl:
185:5648457:d=2021041500:HGT:975 mb:anl:
186:5684345:d=2021041500:TMP:975 mb:anl:
187:5708317:d=2021041500:RH:975 mb:anl:
188:5750512:d=2021041500:VVEL:975 mb:anl:
189.1:5771207:d=2021041500:UGRD:975 mb:anl:
189.2:5771207:d=2021041500:VGRD:975 mb:anl:
190:5820199:d=2021041500:TMP:1000 mb:anl:
191:5844251:d=2021041500:RH:1000 mb:anl:
192:5885460:d=2021041500:VVEL:1000 mb:anl:
193.1:5903388:d=2021041500:UGRD:1000 mb:anl:
193.2:5903388:d=2021041500:VGRD:1000 mb:anl:
194:5951381:d=2021041500:MSLMA:mean sea level:anl:
195:5973901:d=2021041500:HGT:1000 mb:anl:
196:6005539:d=2021041500:PRES:surface:anl:
197:6032368:d=2021041500:HGT:surface:anl:
198:6093540:d=2021041500:TMP:surface:anl:
199:6136917:d=2021041500:ASNOW:surface:0-0 day acc fcst:
200:6141452:d=2021041500:MSTAV:0 m underground:anl:
201:6185929:d=2021041500:WEASD:surface:anl:
202:6207731:d=2021041500:SNOD:surface:anl:
203:6226548:d=2021041500:TMP:2 m above ground:anl:
204:6264127:d=2021041500:POT:2 m above ground:anl:
205:6298296:d=2021041500:SPFH:2 m above ground:anl:
206:6348538:d=2021041500:DPT:2 m above ground:anl:
207:6389047:d=2021041500:DEPR:2 m above ground:anl:
208:6432553:d=2021041500:EPOT:surface:anl:
209:6474355:d=2021041500:RH:2 m above ground:anl:
210.1:6501899:d=2021041500:UGRD:10 m above ground:anl:
210.2:6501899:d=2021041500:VGRD:10 m above ground:anl:
211:6572713:d=2021041500:PRATE:surface:anl:
212:6578933:d=2021041500:APCP:surface:0-0 day acc fcst:
213:6579147:d=2021041500:ACPCP:surface:0-0 day acc fcst:
214:6579361:d=2021041500:WEASD:surface:0-0 day acc fcst:
215:6579575:d=2021041500:FROZR:surface:0-0 day acc fcst:
216:6579789:d=2021041500:FRZR:surface:0-0 day acc fcst:
217:6585662:d=2021041500:SSRUN:surface:0-0 day acc fcst:
218:6585876:d=2021041500:BGRUN:surface:0-0 day acc fcst:
219:6586090:d=2021041500:HGT:lowest level of the wet bulb zero:anl:
220:6644782:d=2021041500:CSNOW:surface:anl:
221:6645323:d=2021041500:CICEP:surface:anl:
222:6645712:d=2021041500:CFRZR:surface:anl:
223:6646316:d=2021041500:CRAIN:surface:anl:
224:6648381:d=2021041500:LFTX:500-1000 mb:anl:
225:6679044:d=2021041500:CAPE:surface:anl:
226:6693054:d=2021041500:CIN:surface:anl:
227:6713470:d=2021041500:PWAT:entire atmosphere (considered as a single layer):anl:
228:6744526:d=2021041500:LCDC:low cloud layer:anl:
229:6777549:d=2021041500:MCDC:middle cloud layer:anl:
230:6801650:d=2021041500:HCDC:high cloud layer:anl:
231:6825235:d=2021041500:TCDC:entire atmosphere:anl:
232:6861883:d=2021041500:HGT:convective cloud top level:anl:
233:6870105:d=2021041500:HGT:cloud base:anl:
234:6953196:d=2021041500:HGT:cloud top:anl:
235:7003356:d=2021041500:HLCY:3000-0 m above ground:anl:
236:7021427:d=2021041500:HLCY:1000-0 m above ground:anl:
237.1:7056753:d=2021041500:USTM:0-6000 m above ground:anl:
237.2:7056753:d=2021041500:VSTM:0-6000 m above ground:anl:
238.1:7123670:d=2021041500:VUCSH:0-6000 m above ground:anl:
238.2:7123670:d=2021041500:VVCSH:0-6000 m above ground:anl:
239:7203828:d=2021041500:PRES:tropopause:anl:
240:7229619:d=2021041500:TMP:tropopause:anl:
241:7253016:d=2021041500:POT:tropopause:anl:
242.1:7270630:d=2021041500:UGRD:tropopause:anl:
242.2:7270630:d=2021041500:VGRD:tropopause:anl:
243:7343782:d=2021041500:PRES:max wind:anl:
244.1:7377534:d=2021041500:UGRD:max wind:anl:
244.2:7377534:d=2021041500:VGRD:max wind:anl:
245:7454060:d=2021041500:TMP:80 m above ground:anl:
246:7485089:d=2021041500:SPFH:80 m above ground:anl:
247:7533905:d=2021041500:PRES:80 m above ground:anl:
248.1:7560656:d=2021041500:UGRD:80 m above ground:anl:
248.2:7560656:d=2021041500:VGRD:80 m above ground:anl:
249:7623695:d=2021041500:HGT:0C isotherm:anl:
250:7649318:d=2021041500:RH:0C isotherm:anl:
251:7675611:d=2021041500:PRES:0C isotherm:anl:
252:7701235:d=2021041500:HGT:highest tropospheric freezing level:anl:
253:7726687:d=2021041500:RH:highest tropospheric freezing level:anl:
254:7752641:d=2021041500:PRES:highest tropospheric freezing level:anl:
255:7777885:d=2021041500:TMP:30-0 mb above ground:anl:
256:7808855:d=2021041500:RH:30-0 mb above ground:anl:
257.1:7835801:d=2021041500:UGRD:30-0 mb above ground:anl:
257.2:7835801:d=2021041500:VGRD:30-0 mb above ground:anl:
258:7898095:d=2021041500:VVEL:30-0 mb above ground:anl:
259:7929464:d=2021041500:TMP:60-30 mb above ground:anl:
260:7960051:d=2021041500:RH:60-30 mb above ground:anl:
261.1:7988231:d=2021041500:UGRD:60-30 mb above ground:anl:
261.2:7988231:d=2021041500:VGRD:60-30 mb above ground:anl:
262:8048913:d=2021041500:VVEL:60-30 mb above ground:anl:
263:8086174:d=2021041500:TMP:90-60 mb above ground:anl:
264:8117502:d=2021041500:RH:90-60 mb above ground:anl:
265.1:8147117:d=2021041500:UGRD:90-60 mb above ground:anl:
265.2:8147117:d=2021041500:VGRD:90-60 mb above ground:anl:
266:8207930:d=2021041500:VVEL:90-60 mb above ground:anl:
267:8247025:d=2021041500:TMP:120-90 mb above ground:anl:
268:8278796:d=2021041500:RH:120-90 mb above ground:anl:
269.1:8310264:d=2021041500:UGRD:120-90 mb above ground:anl:
269.2:8310264:d=2021041500:VGRD:120-90 mb above ground:anl:
270:8371462:d=2021041500:VVEL:120-90 mb above ground:anl:
271:8410645:d=2021041500:TMP:150-120 mb above ground:anl:
272:8441827:d=2021041500:RH:150-120 mb above ground:anl:
273.1:8473432:d=2021041500:UGRD:150-120 mb above ground:anl:
273.2:8473432:d=2021041500:VGRD:150-120 mb above ground:anl:
274:8535142:d=2021041500:VVEL:150-120 mb above ground:anl:
275:8573559:d=2021041500:TMP:180-150 mb above ground:anl:
276:8604398:d=2021041500:RH:180-150 mb above ground:anl:
277.1:8634622:d=2021041500:UGRD:180-150 mb above ground:anl:
277.2:8634622:d=2021041500:VGRD:180-150 mb above ground:anl:
278:8697064:d=2021041500:VVEL:180-150 mb above ground:anl:
279:8734600:d=2021041500:4LFTX:180-0 mb above ground:anl:
280:8767961:d=2021041500:CAPE:180-0 mb above ground:anl:
281:8783098:d=2021041500:CIN:180-0 mb above ground:anl:
282:8803052:d=2021041500:HPBL:surface:anl:
283:8900795:d=2021041500:CAPE:90-0 mb above ground:anl:
284:8911585:d=2021041500:CIN:90-0 mb above ground:anl:
285:8919358:d=2021041500:CAPE:255-0 mb above ground:anl:
286:8934973:d=2021041500:CIN:255-0 mb above ground:anl:
287:8955339:d=2021041500:HGT:equilibrium level:anl:
288:9036520:d=2021041500:PLPL:255-0 mb above ground:anl:
289:9080430:d=2021041500:LTNG:surface:anl:
290:9081210:d=2021041500:RHPW:entire atmosphere:anl:
291:9102709:d=2021041500:SBT123:top of atmosphere:anl:
292:9151461:d=2021041500:SBT124:top of atmosphere:anl:
293:9216577:d=2021041500:SBT113:top of atmosphere:anl:
294:9261248:d=2021041500:SBT114:top of atmosphere:anl:

Any suggestions on what I may be doing wrong, or where the issue might lie? Happy to make a PR if there’s a bug, just not sure if 1) there is one and 2) where to start addressing it.