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1. Weather
Disturbances

2. Introduction
Whatisaweatherdisturbance?
•Aweatherdisturbanceisa
generaltermthatdescribesany
pulseofenergymovingthroughthe
atmosphere.

3. •Theyareimportantinthatthey
canactasfocusingmechanismsfor
stormformation,oreventointensify
lowpressuresystems.
•Theyaretypicallymidorupper
atmospherictroughsoflowpressure
thatareembeddedinthegeneral
windflowoftheatmosphere.

4. Thunderstorm

5. WhatisaThunderstorm?
•Itisasmall-scaleweathersystem
inwhichlightningandthunderare
producedbyafunnel-shaped
cumulonimbuscloud.
•Itisalsoknownasanelectrical
storm,alightningstorm,
thundershowerorsimplystorm.
•Itusuallyproducesgustywinds,
heavyrains,andsometimeshail.

6. •Athunderstormoccurswhentheskies
darken,thewindpicksup,lightning
flashes,thunderroars,andstaticisheard
onyourAMRadio.
•Maylastforabout30min.orevenahour.
•Playsanimportantroleinthehydrologic
cycleandgeneralcirculation.
•Arealsoenginesoftropicaldisturbance
thatbringalargefractionof
theannualrainfalltotropical

7. ExamplesofThunderstorms

8. More:D

9. Tropical
Cyclone

10. WhatisaTropicalCyclone?
•Atropicalcycloneisagenerictermfora
stormwithanorganizedsystemof
thunderstormsthatarenotbasedona
frontalsystem.
•Itisalowpressuresystemthatgenerally
formsovertropicaloceanareas,and
bringswindandthunderstorms.
•ComesfromtheGreekword“kyklos”,
whichmeans“coilingsnake.

11. •Itrushesinaspiralmotionandhavealow
pressurecentercalled“eyeofthestorm”.
•Tropicalcycloneswithmaximumsustained
surfacewindsoflessthan62km/hare
calledtropicaldepressions.Whenthewinds
reach62km/h,itbecomesatropicalstorm.
Windsthatreachesatleast118km/h,then
theyarecalledhurricanesintheAtlantic
andtyphoonsinthePacific.
•Typhoonsarestrongestovertheocean
wheretheygettheirenergy

12. ExamplesofTropical
Cyclones

13. More:D

14. Moonsoon

15. WhatisaMonsoon?
•Theterm“monsoon”wasfromthe
Arabicword“mausim”whichmeans
“seasonalwind”.
•Itisaseasonalflowofwinds
betweentheNorthernandSouthern
Hemispheres.
•MonsoonsaresimilartoWindflow.

16. •Therearetwomonsoonssystemthat
affecttheareassuchas“MonsoonAsia”
orinparticularthePhilippinesand
SoutheastAsia.Thesearethe
SouthwestMonsoonor“Habagat”and
theNortheastMonsoonor“Amihan”.
•Mostsummermonsoonsproducecopious
amountsofrain;wintermonsoons
tendtocausedrought.

17. The2MonsoonSystems
•SouthwestMonsoon(Habagat)-
-feltduringthemonthsofJune
andOctober.
•NortheastMonsoon(Amihan)
-experiencedfrom
NovembertoFebruary.

18. ExamplesofMonsoons

19. More:D

20. Intertropical
Convergence
Zone

21. WhatisIntertropical
ConvergenceZone?
•IntertropicalConvergenceZone
(ITCZ)isthemeetingplaceofhot
andcoldtradewindsinthenorthern
andsouthernhemisphere.
•Theweathersystemmaytriggerrain
showers,evenflashfloodsin
affectedareas.

22. •Itisabeltoflowpressurethatlies
betweenthetradewindszoneofthe
northernandsouthernhemisphere.A
snake-likepathandgenerallynearthe
equator
•Sailorsusuallycalledthisdoldrums,
wherewindspeedanddirectionare
weakandirregular.
•Itislocated5°Northand5°South.

23. ExampleofITCZ