. Compendium of meteorology. Meteorology. EXTENDED-RANGE WEATHER FORECASTING 823 tour charts show that a remarkable meridional circula- tion extends also to the upper troposphere of the middle latitudes. Even at the 5- and 10-km levels, there is, Table IV. Daily Values op the Mean Zonal Gradient along the 60°n latitude circle during the first Six Months of 1949* (In mb per 1000 km) such a case is the high-pressure cell at the 5-km level that within five days (November 24-29, 1949) moved from 70°N and 172°W to 78°N and 55°W along an Day January February March April May June 1
. Compendium of meteorology. Meteorology. EXTENDED-RANGE WEATHER FORECASTING 823 tour charts show that a remarkable meridional circula- tion extends also to the upper troposphere of the middle latitudes. Even at the 5- and 10-km levels, there is, Table IV. Daily Values op the Mean Zonal Gradient along the 60°n latitude circle during the first Six Months of 1949* (In mb per 1000 km) such a case is the high-pressure cell at the 5-km level that within five days (November 24-29, 1949) moved from 70°N and 172°W to 78°N and 55°W along an Day January February March April May June 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 4-3 29 30 31 Monthly means * The principal maxima are in boldface; the principal min- ima are in italics. only in exceptional cases and then at the most as far south as 55°N, an uninten-upted west-east circulation around the pole (Fig. 5). In most cases, the isobars at the 5-km level seem to "meander" (Fig. 6), the pole- ward conve-xities representing warm ridges, the pole- ward concavities representing cold troughs [52, 53]. The sinuosities of the isobars are called waves by some meteorol
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