Jet Stream

Wasaburo Oishi, Japanese Discoverer (1920s)

Fu-Go Balloon Weapon

Strahlstromung (German) for “jet stream” first used in 1939 Big effects on bomber flights during WWII

Jet Stream winds are not uniform

250 mb isotach

Main Upper Tropospheric Jets Closely Associated with the Tropopause

Tropopause

Tropopause Height http://www.atmos.washington.edu/~hakim/tropo/tropo.html

Subtropical Jet Stream

Subtropical Jet Stream Often Associated with a cloud band

http://itg1. meteor. wisc http://itg1.meteor.wisc.edu/wxwise/AckermanKnox/chap7/subtropical_jet.html

Jet Stream’s Relationship to Temperature Can Be Shown through Thermal Wind Arguments

250 mb isotach

1000-500 mb thickness-large thickness gradient and thus thermal wind near jet core

Or alternatively…

The Jet Stream Recall the horizontal temperature effects on the pressure: 500 mb 700 mb 850 mb Psurface Warm Cold

The Jet Stream Consider the balance of forces at each level: Co PGF 500 mb 700 mb 850 mb Ps Warm Cold

There are a variety of jet stream configurations that are well-known