Observations of the Turkana jet and the East African dry tropics: The RIFTJet field campaign by Munday, C, Engelstaedter, S, Ouma, G, Ogutu, G, Olago, D, Ong’ech, D, Lees, T, Wanguba, B, Nkatha, R, Ogolla, C, Gàlgalo, RA, Dokata, AJ, Kirui, E, Hope, R, Washington, R