air masses severe weather (2).ppt

8/18/2019 Air Masses Severe Weather (2).ppt

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Masa Udara

Cuaca Buruk


2/23

Masa UdaraSuatu kumpulan masa udara raksasaseukuran sebuah benua atau lautan

dengan karakter yang sama yangdinyatakan dalam tipe tertentu

Setiap tipe memunyai karakter yangspesifk


3/23

mA


4/23

Severe

Weather


5/23

Thunderstorms

Cold Front Begins with humid air rising,

cooling, and condensing intoa single cumulus cloud.

Cloud builds as they are“ueled” by warm, moist airrom below.


6/23

Thunderstorms

The dropletso water

grow largeruntil they

are so bigthat theyall as rain.


7/23

Cumulonimbus clouds: L Superior

http://www.pasty.com/order.htmlhttp://www.pasty.com/order.html


8/23

Thunderstorms (con’t)

!ightning may beassociated with T.storms

"its #arth $%% times persecond

&'er (%% people in the )Sdie each year romlightning.


9/23

Lihtnin

!ightning is the cause othunder

returns nitrogen to the soilmay cause fres

*ay ha'e helped startpre+biotic ormation oamino acids-


10/23

Lihtnin !ormation

/uringthunderstormsstrong updratscause molecules tobump together andtheir charges toseparate

0egati'e chargesconcentrate at thebase o the clouds


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12/23

Lihtnin !ormation

4hen the + and1 touch, theycreate a

conductive path to the ground.

The other + rush

down this path 5lightning


13/23

Lihtnin on L"Superior


14/23

Lihtnin on L"Michian

http://www.pasty.com/discuss/messages/994/1383.html


15/23

Lihtnin strike


16/23

#olar !ront Theor$6olar ront is a semi+continuousboundary separating cold, polar air

rom more moderate mid+latitude air*id+latitude cyclone wa'e cycloneorms and mo'es along polar ront inwa'elike manner

3rontal wa'e, warm sector, maturecyclone, triple point, secondary low,amily o cyclones


17/23

Large-ScaleLarge-Scale

SettingSettingHemisphericwesterlies typicallyorganized into 4-6“long waves”

Where is upperlevel divergence

most likely tooccur?


18/23

What initiates %c$cloenesis&'

mb heiht

Low

High

Convergence and DivergenceConvergence and Divergence

When upper-leveldivergence isstronger than lower- level convergence ,more air is taken outat the top than is

rought in at theottom! "ur#ace pressure drops , andthe low intensifies ,

or “deepens!”


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air masses severe weather (2).ppt

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