Weather reports from Sumburgh at the time:
METAR COR EGPB 231820Z 14020KT 3000 BR BKN003 16/14 Q1013
TEMPO 5000=
METAR COR EGPB 231750Z 14019KT 2800 BR SCT002 BKN003 15/14
Q1013 NOSIG=
METAR COR EGPB 231720Z 14017KT 2800 BR SCT002 BKN003 15/14
Q1013 BECMG 4000 BR BKN006=
METAR COR EGPB 231650Z 15012KT 2800 BR FEW002 BKN003 15/14
Q1014 BECMG 4000 BR BKN006=