Cross Equatorial Systems
 Northern and Southern Hemisphere Intrusions

Slide 2

Characteristics of Northern Hemisphere Ridges and Troughs

Northern Hemisphere
Upper Ridge/Trough Pattern

Northern Hemisphere Ridge
Winds and Temperature

Northern Hemisphere Ridge
Winds and Potential Temperature

Northern Hemisphere Ridge
Winds and Relative Vorticity

Northern Hemisphere Trough
Winds and Temperature

Northern Hemisphere Trough
Winds and Potential Temperature

Northern Hemisphere Trough
Winds and Relative Vorticity

Characteristics of Southern Hemisphere Ridges and Troughs

Southern Hemisphere
Upper Trough/Ridge Pattern

Southern Hemisphere Ridge
Winds and Temperature

Southern Hemisphere Ridge
Winds and Potential Temperature

Southern Hemisphere Ridge
Winds and Relative Vorticity

Southern Hemisphere Trough
Winds and Temperature

Southern Hemisphere Trough
Winds and Potential Temperature

Southern Hemisphere Trough
Winds and Relative Vorticity

What Happens When a Southern Hemisphere System Crosses the Equator?

Does it behaves like a Nrn Hemisphere Ridge or a Srn Hemisphere Trough?

Case Study

Evaluation of Upper Circulation over the Tropical Atlantic

Vertical Cross Section of Temperature (C) and Winds

Vertical Cross Section of Relative Vorticity and Winds

Vertical Cross Section of Potential Temperature (K), Winds, and Relative Vorticity

Vertical Cross Section of  Potential Temperature (K) and Winds

250 hPa Winds and Divergence
Objective Analysis

250 hPa Winds

250 hPa Winds and Divergence
Objective Analysis

Verification

IR Loop

WV Loop