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cirrus trails
leaning in towards
the warm air
wav e clo uds o ver h ills d o no t mo ve w ith w ind
wind near ground from SW
Plate 17 View looking westward towards an approaching warm front, with lines of jet stream clouds
extending from the northwest, from which trails of ice crystals are falling. In the middle levels are dark
wave clouds formed in the lee of small hills by the southwesterly airflow, whereas the wind direction
at the surface is more southerly - as indicated by the smoke from the chimney ( photograph copyright by
F.H. Ludlam: diagram by R.S. Scorer: both published in Weather, vol. 17, no. 8, 1962, pp. 266-7 ).
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