. Collected reprints, Essa Institute for Oceanography. Oceanography 628 MONTHLY WEATHER REVIEW Vol. 95, No. 9 the maximum number in each season was 47, for east winds in summer, and south-southwest winds in winter. It should be remembered, however, that, northwesterly onshore winds were generally accompanied by low cloud or fog, and that consequently the asymmetry is accentu- ated, if not caused entirely, by the lack of a 1,000-m. value. It is also true that when drifting snow or low clouds precluded a reasonably complete sounding the balloon launching schedule was suspended temp
. Collected reprints, Essa Institute for Oceanography. Oceanography 628 MONTHLY WEATHER REVIEW Vol. 95, No. 9 the maximum number in each season was 47, for east winds in summer, and south-southwest winds in winter. It should be remembered, however, that, northwesterly onshore winds were generally accompanied by low cloud or fog, and that consequently the asymmetry is accentu- ated, if not caused entirely, by the lack of a 1,000-m. value. It is also true that when drifting snow or low clouds precluded a reasonably complete sounding the balloon launching schedule was suspended temporarily. For each sounding that extended above a nominal altitude of 1,000 m. (tabulated as an actual 990 in.) the components of the 1,000-m. wind parallel and normal to the surface wind were obtained. The component values were then averaged by class, and the total shear, , the differences between components at 1,000 m. and the sur- face, were calculated. The averaged values are given in table 1 by surface wind direction and season. The directional distribution of the surface wind speeds shows that in summer easterly winds are somewhat stronger than westerly winds, while in winter, winds with a component from the northeast are stronger than winds with a component from the southwest. If the mean wind speed from each direction is considered representa- tive of that sector, the mean summer and winter wind speeds are nearly the same at about 4 The directional distribution of the mean shear com- ponents shows that the parallel component of the 1,000-m. wind is less than the surface speed for easterly wind directions, and exceeds the surface speed for westerly wind directions in both winter and summer. This would be expected from regional horizontal density gradients and from the station location with respect to the open sea. The normal component of the shear vector is directed to the left for all surface wind directions in all seasons, however, its magnitude is greatest f
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