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Abstract
Events at sea level and aloft over the United States are related to the approach of a speed maximum in the jet stream. In the left hand portion of the area downstream from the jet maximum where air at the jet level is decelerating, frontogenesis, cyclogenesis, and spread of precipitation occur. Other indications of high level divergence to the left of the advancing jet maximum are given by changes in the structure of a nearby cold dome. Insofar as the changes in the cold dome are precedent, they constitute a means of forecasting cyclogenesis.