On a summer day, the following observations are made in Zurich: 0450Z 24009 KT 7000 SCT040 SCT120 15/12 Q1014 NOSIG =0650Z 24010KT 6000 SCT040 SCT120 17/13 Q1012 NOSIG = 0850Z 23014KT 8000 BKN100 19/13 Q1009 BECMG 26020G35KT TS = 1050Z 28022G33KT 4000 TSRA SCT015 SCT050CB OVC080 16/14 Q1006 BECMG NSW = 1250Z 31016KT 9999 SCT025TCU BKN030 13/09 Q1009 NOSIG = 1450Z 30012KT 9999 SHRA BKN020TCU 14/10 Q1011 NOSIG = 1650Z 30009KT SCT025 BKN035 13/10 Q1013 RESHRA NOSIG = 1850Z 28006KT 9999 SCT040 11/09 Q1014 NOSIG = 2050Z 26004KT CAVOK 10/08 Q1015 NOSIG = You conclude, that... A. a warm front has passed the station in the morning, and warm sector weather prevailed in the afternoon. B. a cold front has passed the station in the morning, and rear side weather prevailed in the afternoon. C. a warm front in the morning, and a cold front in the afternoon have passed the station. D. a cold front in the morning, and a warm front in the afternoon have passed the station.

 

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