Stalled Jet Stream

The Russian heat wave and Pakistan floods have been caused by the northern hemisphere jet stream grinding to a halt, keeping weather patterns stationery. Over Pakistan, the monsoon and its drenching rains are stationary whereas dry air from eastern Africa is blowing right up into Russia causing the continuous heat wave. The spinning wind currents, known as Rossby waves, that give the jet stream its wavy form by pushing it north and south are responsible for this prolonged halt. The waves, working against the jet stream, have been stronger this year, but the reasons for this abnormal activity are not fully understood. The usual suspects want to blame man-made global warming but Gerald Meehl of the National Centre for Atmospheric Research says it is more likely to be solar activity.


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