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May and June ( Fig. 5 , top panels), a zonal ridge of high pressure anomalies inhibited the typical southward push of cold fronts from Canada that often serve to organize widespread rains. July (bottom left) saw a somewhat different pattern, though no less effective in inhibiting rainfall. An intense anticyclone was centered over the northern plains region, preventing frontal incursions while also stabilizing the atmosphere and inhibiting deep convection that typically contributes appreciably to
May and June ( Fig. 5 , top panels), a zonal ridge of high pressure anomalies inhibited the typical southward push of cold fronts from Canada that often serve to organize widespread rains. July (bottom left) saw a somewhat different pattern, though no less effective in inhibiting rainfall. An intense anticyclone was centered over the northern plains region, preventing frontal incursions while also stabilizing the atmosphere and inhibiting deep convection that typically contributes appreciably to
