101-13 High Altitude Weather

Question 1

Pressure levels ______ in the South due to ______ temps
Pressure levels ______ in the North due to ______ temps

Answer 1

Increase - warm
Decrease - cold

*PFG will push air from S to N

Question 2

Jet Stream & the 2 types

Answer 2

A narrow band of winds with a wind speed of 50kts or greater
In or near tropopause; polar side

Polar Jet Stream and Subtropical

Question 3

Polar Jet Stream

Answer 3

The core is ~30000 ft
Winter = goes south, wind speeds increase, altitude increases (25 N lat)
Summer = goes north, wind speed decreases, altitude decreases (45 N lat)

Question 4

Subtropical Jet Stream

Answer 4

Core ~35-45000 ft (avg. 39000)
Most active during winter, dissipates to almost nothing in summer (25 N Lat)
3 wave crests: Asia, North Am., Near East

Question 5

Size of jet streams

Answer 5

L - 1000s miles
W - 100s miles
D 1000s feet

Question 6

Clear Air Turbulence

Answer 6

-unexpected/no visual cues
-CAT mixed w/ Jet Stream TROP and upper fronts
- Upwind of base of TROF
- Along TROF centerline
-Convergence of 2 jet streams: Polar will shift under subtropical

Descend if Temp is Decreases
Ascend if temp is rising