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Mid-latitude Cyclone Climatology

Mid-latitude Cyclone Climatology. Read Ch. 10 Read Ch. 1. When are cyclones strongest? Summer or Winter? When are cyclones farthest poleward ( north for us )? Summer or Winter? WHY?. More cyclones in January than July Ratio of Cyclones to Anticyclones is 1.8:1 (both Jan. & July)

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Mid-latitude Cyclone Climatology

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  1. Mid-latitude Cyclone Climatology Read Ch. 10 Read Ch. 1

  2. When are cyclones strongest? • Summer or Winter? • When are cyclones farthest poleward (north for us)? • Summer or Winter? WHY?

  3. More cyclones in January than July Ratio of Cyclones to Anticyclones is 1.8:1 (both Jan. & July) More activity East of Rockies than West Cyclones and Anticyclones are: More intense More numerous Farther south in Jan. vs. July (in our hemisphere)

  4. Cyclones-Genesis – January – East Coast/Rockies • Cyclones-Genesis – July – East Coast/Rockies • Anticyclones-Genesis – January – NW Canada/Great Plains • Anticyclones-Genesis – July – SW Canada • Cyclone motion – East/Northeast from genesis region • Anticylone motion – East/Southeast from genesis region

  5. Zishka, K. M., and P. J. Smith, 1980: The climatology of cyclones and anticyclones over North America and surrounding ocean environs for January and July, 1950-77. Mon. Wea. Rev., 108, 387-401

  6. From Zishka and Smith (1980)

  7. From Zishka and Smith (1980)

  8. From Zishka and Smith (1980)

  9. From Zishka and Smith (1980)

  10. January – East Coast Cyclones stronger than Rocky lee storms • July – East Coast Cyclones more similar to Rocky lee storms • genesis – creation • lysis – destruction

  11. What factors affect cyclogenesis? • East of Rockies or Appalachians • Conservation of PV Pθ = -g (ζθ + f)/∂p/∂θ • East Coast • Strong thermal gradients, esp. between coast & Gulf Stream

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