In the winter because this is where there is the

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In the winter; because this is where there is the strongest difference between air masses. 4. Briefly describe the role/importance of midlatitude cyclones. Bring a variety of significant weather Can produce snow storms, tornadoes, hail, strong winds, rain storms, ice storms, etc. Transport warm air from subtropical regions to the poles Transport cold air from the polar regions to the Equator Transport warm air from the surface to the upper atmosphere Redistribute moisture 5 . Midlatitude cyclones spawn from Rossby Waves that develop in the jet stream circulation aloft. (True / False ) 6. Put the following cyclogenesis stages in correct order from first stage to last stage. Place “1” at the first stage, “2” at the second stage, etc. A cyclone (low pressure system) is created along the Polar Front Rossby Waves (troughs and ridges) begin to develop in the Polar Jet Stream as cold air from the north tries to invade warm air to the south 1 The Polar Front is established and strengthens due to strong horizontal temperature gradient 2 Low-level convergence begins to occur The Polar Jet Stream develops and strengthens as pressure surfaces become steep Air begins to rises from the Earth’s surface creating a “chimney” Divergence (stretching of the wind field) occurs downwind of the upper- level trough and air begins to accelerate
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7. Briefly describe how a midlatitude cyclone can intensify (i.e. undergo cyclogensis). 8. Briefly describe how a midlatitude cyclone can weaken (i.e. undergo cyclolysis). 9. _________________ Cyclogenesis ____________________________________ describes the development and formation of midlatitude cyclones. 10. In the table below, determine which stage of midlatitude cyclone development ( initial, frontal, growing, mature, occlusion, dissipation ) is being described in each cell. Dissipation Polar front is reestablished; low-level convergence weakens as a result of weakened upper-level divergence Frontal Wave-like kink begins to develop with cold front and warm front; surface low pressure center also develops growing Warm sector develops and midlatitude cyclone begins to move with the steering current (i.e. jet stream) occlusion Most intense stage; cold front overtakes the warm front; heavy precipitation mature Widespread precipitation with characteristic comma-shaped cloud seen on satellite image Initial stage Low-level convergence begins along a stationary front; beginning of cyclonic flow 11. What is the typical midlatitude cyclone track in the Northern and Southern Hemisphere? Why?
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12. List the origins of the common types of midlatitude cyclones that form over North America (i.e. the types of North American midlatitude cyclones). How do these relate to cyclone families? Discuss the possible cyclone tracks of a few of the midlatitude cyclones.
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