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EESA09H3 (200)
Lecture 4

EESA09H3 Lecture Notes - Lecture 4: Occluded Front, Wind Shear, Cold Front


Department
Environmental Science
Course Code
EESA09H3
Professor
Tanzina Mohsin
Lecture
4

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EESA09 4TH LEC.
Midlatitude Cyclones
The el niño-southern oscillation (ENSO)
oEx of atmosphere ocean circulation
El Niño- under normal conditions strong trade winds blowing up to the west
along the equatorial pacific piles up the warm water in the western pt. of the
pacific
Warm surface waters creates the conditions for strong upwelling in the
eastern pacific…etc
La lena-extreme form of cold sign…
Trade winds weaken –el niño
Mixing…
Midlatitude cyclones
Hurricanes in the great lakes
Those are tropical storms
In tropical region…between 5-20 degress north and south
Midlatitude Cyclones
100s to 1000s km in extent (larger than hurricanes )
less intense winds
can have thunderstorms and tornadoes associated with them (cold front)
large scale flow –reviewed
fronts
Climatology of the midlatitudes
Three cell theory
Air masses revisited
Air masses
Midlatitudes-battle ground between cp (continental polar ) and mT
(maritime tropical)
Fronts
oDivision between air masses
oStationary front
oCold front
oWarm front
oOcculded front
o Stationary front
stable
low pressure trough
Horizontal wind shear
Alternating blue triangles and red semi-cicles
Stable –lack of thrat …
Cold front
oCold air pushing into warm front air masses
oDesignated by blue line w/ triangles facing warm air
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