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Jet Streams & Fronts - Climatology
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In this lesson, Bhanwar has taken an important topic that is the Jet Streams, Air Masses and Fronts which are crucial to the weather of any place.

Bhanwar Singh
Ex- National Defence Academy (115 Course) Cleared Civil Services Examination, 2012

Unacademy user
thanku sir awesome course
thank you sir !!@!@@ very useful lecture
difference in temperature???? it is difference in pressure
you have to practice more in speaking about a subject, you are confusing students because of your lack of clarity in speaking
you have to practice more in speaking about a subject, you are confusing students because of your lack of clarity in speaking
very useful.but my advice is that ..please elaborate it in hindi also hinglish should be better because most listeners are also from hindi belt ..and it will benefit them and number of student will also increase please seriously think about this suggestion
  1. CRASH COURSE-WORLD GEOGRAPHY Presented by - Bhanwar Singh Sirohi


  3. JET STREAMS It is a region of long, narrow high speed wind that typically flow North- East, East and South-East in the middle and upper troposphere They may have speed up to 300 km/hr and flows in meandering path These are formed dUe to horizontal differences in temperature that exist over a considerable vertical distance through troposphere These may be of following types Polar Front Jet Stream Westerly Sub-tropical Jet Stream Easterly Tropical Jet Stream Stratospheric Sub-polar Jet Stream

  4. Subtropical jet Polar Jet Tropopause Hadley Cell Ferrel Cell Polar Cell North Pole 60 N Equator POLAR JET STREAM SUB-TROPICAL JET STREAM SUB-TROPICAL JET STREAM POLAR JET STREAM

  5. AIR MASSES An air mass is a large body of air whose physical properties (temperature & humidity) are more or less uniform for hundreds of kilometers It modifies temperature and humidity of the path in which it travels and may also get modified itself The air mass must stagnate on the source region for a long period of time There should also be homogeneity in surface conditions Air masses are now thought to have considerable say in the climate modification of an area

  6. 160 120 100 6020 0 20 60 100 120 160 60 mP mP 30 mT mT 0 mE ME 30 MT mT mT mP 60

  7. FRONTS Front: The slope between the two opposing air masses having opposite characteristics in terms of air pressure, temperature, density, humidity and wind direction Term front' was first used by V Bjerknes and J Bjerknes Fronts develops more clearly in areas of convergence of air masses, for instance, mid-latitudes Fronts are classified into four types on basis of their characteristic features 1. Stationary Front 3. Cold Front 2. Warm Front 4. Occluded Front

  8. TYPES OF FRONTS STATIONARY FRONT Two contrasting air masses converge in such a way that they become parallel air ythat they become parallel WARM FRONT a Well defined boundary zone at the front of the warm-sector of a depression, COLD FRONT where mass of warm air is overriding and rising above the cold air mass Boundary between a warm and a cold air mass where cold air mass advances and undercuts the warm air OCCLUDED FRONT Overtaking of warm front by the cold front which ultimately lifts the warm sector off the surface of the earth


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