jet streams may deflect the air masses moved by the prevailing westerlies
jet_stream is not airstream. jet_stream is airstream. jet_of_water is not water. jet_stream is prevailing_wind. westerlies is not prevailing_wind. regurgitant_jet is not flowing. westerlies is prevailing_wind. jet_of_water is jet. jet_stream is not prevailing_wind. jet_of_water is not jet.