Download presentation
Presentation is loading. Please wait.
Published byReginald Chapman Modified over 9 years ago
1
Mid-latitude Cyclone Climatology Read Ch. 10 Read Ch. 1
2
When are cyclones strongest? When are cyclones strongest? Summer or Winter? When are cyclones farthest poleward (north for us)? When are cyclones farthest poleward (north for us)? Summer or Winter? WHY? WHY?
3
More cyclones in January than July More cyclones in January than July Ratio of Cyclones to Anticyclones is 1.8:1 (both Jan. & July) Ratio of Cyclones to Anticyclones is 1.8:1 (both Jan. & July) More activity East of Rockies than West More activity East of Rockies than West Cyclones and Anticyclones are: Cyclones and Anticyclones are: More intense More numerous Farther south in Jan. vs. July 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)
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? What factors affect cyclogenesis? East of Rockies or Appalachians Conservation of PV P θ = -g (ζ θ + f)/ ∂ p/ ∂θ P θ = -g (ζ θ + f)/ ∂ p/ ∂θ East Coast Strong thermal gradients, esp. between coast & Gulf Stream
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.