Comparison of Tropical Cyclones & Temperate Cyclones

PMF IAS Environment

Tropical Cyclones and Temperate Cyclones -Comparison

Tropical Cyclone

Temperate Cyclone

Origin
Thermal Origin Dynamic Origin – Coriolis Force, Movement of air masses.
Latitude
Confined to 100 – 300 N and S of equator. Confined to 350 – 650 N and S of equator. More pronounced in Northern hemisphere due to greater temperature contrast.
Frontal system
Absent The very cyclone formation is due to frontogenesis.[Occluded Front]
Formation
They form only on seas with temperature more than 26-270 C. They dissipate on reaching the land. Can form both on land as well as seas
Season
Seasonal: Late summers (Aug – Oct) Irregular. But few in summers and more in winters.
Size
Limited to small area.

Typical size: 100 – 500 kms in diameter.

Varies with the strength of the cyclone.

They cover a larger area.

Typical size: 300 – 2000 kms in diameter. Varies from region to region.

Shape
Elliptical

Mature stage tropical cyclone

Inverted ‘V’

middle latitude cyclones -extra tropical cyclones- temperate cyclones

Rainfall
Heavy but does not last beyond a few hours. If the cyclone stays at a place, the rainfall may continue for many days. In a temperate cyclone, rainfall is slow and continues for many days, sometimes even weeks.
Wind Velocity and destruction
Much greater (100 – 250 kmph)(200 – 1200 kmph in upper troposphere)

Greater destruction due to winds, storm surges and torrential rains.

Comparatively low. Typical range: 30 – 150 kmph.

Less destruction due to winds but more destruction due to flooding.

Isobars
Complete circles and the pressure gradient is steep Isobars are usually ‘V’ shaped and the pressure gradient is low.
Life time
Doesn’t last for more than a week Last for 2-3 weeks.
Path
East – West. Turn North at 200 latitude and west at 300 latitude.

Move away from equator.

The movement of Cyclones in Arabian Sea and Bay of Bengal is a little different.

Here, these storms are superimposed upon the monsoon circulation of the summer months, and they move in northerly direction along with the monsoon currents.

Favorite Breeding Grounds for Tropical Cyclones

West – East (Westerlies – Jet Streams). Move away from equator.

Distribution of Temperate Cyclones

Temperature distribution
The temperature at the center is almost equally distributed. All the sectors of the cyclone have different temperatures
Calm region
The center of a tropical cyclone is known as the eye. The wind is calm at the center with no rainfall. In a temperate cyclone, there is not a single place where winds and rains are inactive.

 

Driving force
The tropical cyclone derives its energy from the latent heat of condensation, and the difference in densities of the air masses does not contribute to the energy of the cyclone. The energy of a temperate cyclone depends on the densities of air masses.

 

Influence of Jet streams
The relationship between tropical cyclones and the upper level air-flow is not very clear. The temperate cyclones, in contrast, have a distinct relationship with upper level air flow (jet streams, Rossby waves etc.)

Jet Streams ridge-trough - Weather in Temperate Regions

Clouds
The tropical cyclones exhibit fewer varieties of clouds – cumulonimbus, nimbostratus, etc.. The temperate cyclones show a variety of cloud development at various elevations.

occluded front clouds

Surface anti-cyclones
The tropical cyclones are not associated with surface anticyclones and they have a greater destructive capacity. The temperate cyclones are associated with anticyclones which precede and succeed a cyclone. These cyclones are not very destructive.
Influence on India
Both coasts effected. But east coast is the hot spot. Bring rains to North – West India. The associated instability is called ‘Western Disturbances’.
  • Titbit: In certain instances, two cyclones move toward each other and revolve around one another, with the smaller and less intense one moving more quickly. This phenomenon is called the Fujlwara effect.

Primary References: NCERT Geography, IMDEncyclopedia BritannicaSpectrum’s Geography [Amazon and Flipkart] and Savindra Singh [Amazon and Flipkart]

Sharing is Caring !!

Newsletter Updates

Subscribe to our newsletter and never miss an important update !!

8 Comments

Leave a Reply

Your email address will not be published.

  1. Dear sir

    I have no words to explain about ur notes more than excellent well defined digram and note. One thing i want to say kindly prepare the agriculture geography notes also .

  2. Brilliant work!! No words to define.
    Secure your content, else many people will copy-paste it.
    Also start selling PDFs like other online websites do.

    • I do sell PDFs.
      I have no problem with people copy pasting from my website. But those pathetic Piracy websites are the real problem. They make money out of somebody else’s hard work. Shame!

  3. The favourite breeding grounds of temperate cyclones are:
    1) Over USA and Canada, extending over Sierra Nevada, Colorado, Eastern Canadian
    Rockies and the Great Lakes region.
    2) Mexican Gulf
    3) The belt extending from Iceland to Barents Sea and continuing over Russia and
    Siberia.
    4)Winter storms over Baltic Sea.
    5) Mediterranean basin extending upto Russia and even upto India in winters (called
    western disturbances)
    6)The Antarctic frontal zone

    NOT FOUND IN
    1) South-east Caribbean region, May be it is quite near to the equator.
    2) North-west Australia

    May be here no occluded front forms as no airmass exits due to warm current.

    Could you please explain why temperate cyclone doesnot form over these above two areas?

    • The prerequisite for the formation of Temperate cyclones is the convergence of a warm and cold air masses. Such a condition is met only between 30 degree and 60-70 degree N and S (that’s why they are called temperate cyclones). South-east Caribbean region and North-west Australia fall in tropics where there is no converging of warm and cold air masses (that’s why temperate cyclones are also called as extra-tropical cyclones).

      • Australia is between 15-38 degree N and Gulf of Mexico between 23 half and 30 degree N.So, in Gulf of Mexico as well there must be little chance of temperate cyclone .So,do they occur there or not?

        Though GULF of Mexico’s Tropical cyclone are more frequent rather Temperate.
        Just need some clarity on it.

      • You see the spatial distribution of temperate climate varies with seasons (in summer it shifts towards north and in winter it shifts south). For example in summer Gulf of Mexico will see tropical cyclones and in Winter they see Temperate cyclones. You can take Western disturbances that India face in winter as an example. The same western disturbances are almost non existent in summer as the temperate climate shifts north in summer.

 

One-Stop Solution for Environment

PMF IAS Environment is a One-Stop solution for all your needs concerning the subject of Environment for the UPSC Civil Services Exam.

It is the highest-rated bestselling Environment Book on Amazon with an average rating of 4.7/5

Year(s) = Validity of the Downloads

1 Year Validity == Validity of the Download links (both Static & Current Affairs) is 1 Year from the date of purchase.
2 Years Validity == Validity of the Download links (both Static & Current Affairs) is 2 Years from the date of purchase.

For example,

If you purchase the notes with “Download Validity == 1 Year,” on 25/06/2022, then you will be able to download the Static Files + Current Affairs files till 26/06/2023.
If you purchase the notes with “Download Validity == 2 Years,” on 25/06/2022, then you will be able to download the Static Files + Current Affairs files till 26/06/2024.
If we bring out the Updated (New) Editions of the Static Files within your membership period, you will be able to download them without paying anything extra.
Irrespective of the package you choose, Current Affairs of Geography, Environment, Sci & Tech and Indian Agriculture are available from Jan 2022.
Current Affairs of 2021 & earlier are available for free on PMF IAS Google Drive Folder.
Once the payment is made, you need to log in to the Downloads Page to download the files (check your email for the login details).

Newsletter

Subscribe to our newsletter and never miss an important update!