LIGHT WINDS IN THE STRATOSPHERE (15 TO 24 KM). PART TWO,
RAVEN INDUSTRIES INC SIOUX FALLS S DAK METEOROLOGY DEPT
Pagination or Media Count:
There is a smooth climatological transition in the pattern of light wind spells in the stratosphere between 15 and 24 km from pole to tropics. At high latitudes, light wind spells are largely confined to summer months, are plentiful in number and about equally distributed between the four altitudes 15, 18, 21, and 24 km. At mid-latitudes light wind spells are present in appreciable numbers in spring, summer and fall, but tend to occur at 21 and 24 km in spring and fall, at 15 and 18 km in summer. This regime persists with slowly decreasing numbers of spells until a point is reached between 10S and 15S where light winds occur sporadically and show little preference for altitude or season. On the evidence of one summer month, thickness of the light wind zone decreases and becomes more variable from pole to tropics.