If no flag is set on the SLP, the numerical models' built-in QC programs may still decide to toss the report, or they may decide to keep it. Flags set on other parameters will be checked by the models if the SLP has a keep flag set, or if the SLP has no flag set and the models' built-in QC decides the SLP is of neutral or good quality. Wind flag 42 'P' for rejected wind dir or wind speed, 'H' for kept wind direction or wind speed, blank if neither. SST flag 44 'P' if SST was rejected, 'H' if it was kept, blank if neither. If the callsign was corrected, the new callsign goes here.
Letters are in upper case.
If the correction is to a parameter other than latitude or longitude, the original value for that parameter must precede the corrected value. Its SLP observation was purged and its wind observation was kept. Its original wind has direction 340 at 41 kts and its corrected wind has direction 340 at 14 kts. Its original SLP is 1001.0 mb and its corrected SLP is 1011.0 mb. Its wind was kept.