When my trajectories have points near 180 lon (or -180 lon), there are error messages. Here is one example:
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WARNING main: source point off grid number 1217
Position: 3.1300001 -180.00999
Grid Loc: 480.98666 72.173332
WARNING main: source point off grid number 1218
Position: 3.1400001 -180.00999
Grid Loc: 480.98666 72.186668
WARNING main: source point off grid number 1219
Position: 3.1400001 -180.00999
Grid Loc: 480.98666 72.186668
WARNING main: source point off grid number 1220
Position: 3.1500001 -180.00999
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WARNING main: source point off grid number 1
Position: 3.1400001 179.50000
Grid Loc: 480.33334 72.186668
If it helps to know, my CFG_ARL files looks like this:
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Model Type: ECMG
Grid Numb: 99
Vert Coord: 2
Pole Lat: 50.250
Pole Lon: 179.250
Ref Lat: 0.750
Ref Lon: 0.750
Grid Size: 0.000
Orientation: 0.000
Cone Angle: 0.000
Sync X Pt: 1.000
Sync Y Pt: 1.000
Sync Lat: -50.250
Sync Lon: 180.000
Reserved: 0.000
Numb X pt: 480
Numb Y pt: 135
Numb Levels: 31
Level 0: .00000 4 SHGT U10M V10M T02M
Level 1: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 2: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 3: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 4: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 5: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 6: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 7: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 8: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 9: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 10: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 11: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 12: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 13: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 14: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 15: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 16: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 17: ****** 0
Level 18: ****** 0
Level 19: ****** 0
Level 20: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 21: ****** 0
Level 22: ****** 0
Level 23: ****** 0
Level 24: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 25: ****** 0
Level 26: ****** 0
Level 27: ****** 0
Level 28: ****** 0
Level 29: ****** 6 HGTS TEMP UWND VWND WWND RELH
Level 30: ****** 0