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Diurnal variation of lowcloud frequency
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aircraft airﬁeld anemometer APPENDIX I—continued associated pressure AVERAGE NUMBER Bahrein British Isles calculated Cardington cent cloud base cloud height coast COLUMN NINE conﬁned conversion factors Croydon density diagram distance diurnal variation effect example fall in 24 Felixstowe ﬁgures ﬁrst ﬁtness ﬁgures ﬂat ﬂow geostrophic wind give given ground Habbaniya Height Period hill hour inland June July Aug Karachi katabatic wind Khartoum land Little Rissington London low cloud Lydda Malta maximum gust maximum temperature Meteorological Ofﬁce Mildenhall miles monsoon mountain Nairobi night Northolt NUMBER OF DAYS observations Observatory occur Penrhos percentage frequency pollution Prestwick radiation fog rain red ﬁtness reduce visibility regions runway sea level Sept shows slope smoke snow cover stations strong winds sufﬁcient summer surface TABLE Tangmere tenths Ternhill Thorney Island Valley values vertical currents visibility less wind speed winter Wymeswold ZONE TIME SHOWN